[国际标准]ASME_B1.13M-2005标准
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[国际标准]ASME_B1.13M-2005标准,国际标准,ASME_B1,13,2005,标准
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AN AMERICAN NATIO NAL STANDARDMetric Screw Threads:M ProfileASME B1.13M-2005(Revision of ASME B1.13M-2001)ASME B1.13M-2005(Revision of ASME B1.13M-2001)Metric ScrewThreads:M ProfileAN AMERICAN NATIONAL STANDARDThree Park Avenue New York, NY 10016Date of Issuance: March 10, 2006The next edition of this Standard is scheduled for publication in 2010. There will be no addenda orwritten interpretations of the requirements of this Standard issued to this edition.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria for American NationalStandards. The Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to participate. The proposed code or standard was madeavailableforpublicreviewandcommentthatprovidesanopportunityforadditionalpublicinputfromindustry,academia,regulatory agencies, and the public-at-large.ASME does not “approve,” “rate,” or “endorse” any item, construction, proprietary device, or activity.ASME does not take any position with respect to the validity of any patent rights asserted in connection with anyitems mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable letters patent, nor assumes any such liability. Users of a code or standard are expresslyadvised that determination of the validity of any such patent rights, and the risk of infringement of such rights, isentirely their own responsibility.Participation by federal agency representative(s) or person(s) affiliated with industry is not to be interpreted asgovernment or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the establishedASME procedures and policies, which precludes the issuance of interpretations by individuals.No part of this document may be reproduced in any form,in an electronic retrieval system or otherwise,without the prior written permission of the publisher.The American Society of Mechanical EngineersThree Park Avenue, New York, NY 10016-5990Copyright 2006 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .viCommittee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .viii1General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11.1Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11.2Interchangeability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11.3References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11.4Acceptability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11.5Reference Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11.6General Symbols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11.7Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11.8Federal Government Use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22.1Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23Screw Thread Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43.1Basic M Thread Profile. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43.2Design M Profiles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63.3Crest and Root Forms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64Series of Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64.1Standard Coarse Pitch General Purpose and Mechanical FastenerSeries, M Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64.2Standard Fine Pitch M Profile Screw Threads . . . . . . . . . . . . . . . . . . . . . . . . . . .74.3Preferred Sizes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74.4ISO Metric Thread Series. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75Allowances and Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75.1ISO System of Limits and Fits as Applied to Screw Threads. . . . . . . . . . . . .75.2Tolerance Grade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115.3Tolerance Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .125.4Allowance/Tolerance Formulas and Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . .125.5Selected Tolerance Classes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .125.6Length of Thread Engagement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .125.7Circular Runout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .125.8Lead and Flank Angle Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .125.9Coated or Plated Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .126Design Formulas and Tabulated Values for Allowances and Tolerances . . . . . . . . . .126.1General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .126.2Rounding Procedure for Tabulated Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .126.3Allowances (Fundamental Deviations) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .156.4Length of Thread Engagement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .156.5Crest Diameter Tolerances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .156.6Pitch Diameter Tolerances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .157Designation of Screw Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .197.1General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .197.2Designation of Standard Screw Threads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19iii7.3Designation of Thread Fit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .207.4Designation of Rounded Root External Thread. . . . . . . . . . . . . . . . . . . . . . . . . .207.5Designation of Threads Having Modified Crests . . . . . . . . . . . . . . . . . . . . . . . .207.6Designation of Special Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .207.7Designation of Multiple Start Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .207.8Designation of Coated or Plated Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .207.9Designation of Threads With Adjusted Size Limits . . . . . . . . . . . . . . . . . . . . . .208Dimensional Accommodation of Coating or Plating for 60 deg Threads . . . . . . . . . .218.1Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218.2Material Limits for Coated Threads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218.3Dimensional Effects of Coating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218.4External Thread With Allowance Available for Coating . . . . . . . . . . . . . . . . .218.5External Thread With No Allowance for Coating. . . . . . . . . . . . . . . . . . . . . . . .238.6Internal Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .248.7Electrodeposited Coatings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .248.8Other Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .259Limits of Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .259.1Standard Thread Series. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .259.2Determination of Size Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .259.3Formulas for Calculating Limiting Dimensions for M ProfileScrew Threads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .259.4Examples of Calculations of Size Limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3410Lead and Flank Angle Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3710.1Lead and Flank Angle Acceptance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37Figures1Basic M Thread Profile (ISO 68-1 Basic Profile). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42Internal Thread, Design M Profile With No Allowance (FundamentalDeviation) (Maximum Material Condition) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53External Thread, Design M Profile With No Allowance (FundamentalDeviation) (Flanks at Maximum Material Condition). . . . . . . . . . . . . . . . . . . . . . . .54Metric Tolerance System for Screw Threads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65M Profile, External Thread Root, Upper and Lower Limiting Profiles forr min.p0.125P and for Flat Root Form (Shown for Tolerance Position g). . . . .76Ratio of Pitch Diameter Change to Thickness of Coating on 60 degThreads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .227Effects of Electrodeposited Coating on 60 deg External Threads . . . . . . . . . . . . . . .238Internal Thread Limiting M Profile, Tolerance Position H . . . . . . . . . . . . . . . . . .349External Thread Limiting M Thread Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37Tables1General Symbols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22Thread Data, M Profile. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33Limit Values for M Profile Minimum Rounded Root Radius. . . . . . . . . . . . . . . . . . .84Standard Coarse Pitch M Profile General Purpose and MechanicalFastener Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85Standard Fine Pitch M Profile Screw Threads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86ISO 261 Diameter/Pitch Combinations From Which the StandardsWere Selected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97Length of Thread Engagement (ISO 965-1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .138Examples of Tolerance Classes Required for Normal Gage Length ContactsWith Various Thread Engagement Lengths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .149Minor Diameter Tolerances of Internal Thread, TD1(ISO 965-1) . . . . . . . . . . . . . . .1410Major Diameter Tolerances of External Thread, Td (ISO 965-1). . . . . . . . . . . . . . . . .15iv11Pitch Diameter Tolerance of External Thread, Td2(ISO 965-1) . . . . . . . . . . . . . . . . .1612Pitch Diameter Tolerance of Internal Thread, TD2(ISO 965-1) . . . . . . . . . . . . . . . . .1713Allowance (Fundamental Deviation) for Internal and External Threads(ISO 965-1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1814External Thread Limiting Dimensions M Profile. . . . . . . . . . . . . . . . . . . . . . . . . . . .2615Internal Thread Limiting Dimensions M Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . .3516A Example of External Screw Thread, Standard Size. . . . . . . . . . . . . . . . . . . . . . . . . . . . .3916B Example of Internal Metric Screw Thread, Standard Size . . . . . . . . . . . . . . . . . . . . . .4116C Example of External Metric Screw Thread, Non-Standard Size. . . . . . . . . . . . . . . . .4316D Example of Internal Metric Screw Thread, Non-Standard Size . . . . . . . . . . . . . . . . .4517Allowable Variations in Lead and Equivalent Change in FunctionalDiameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4718Allowable Variations in 30 deg Basic Half-Angle of Screw Threads. . . . . . . . . . . .50Nonmandatory AppendicesAStandard Rules for Rounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51BThread Strength Design Formulas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52CLimiting Dimensions M Profile Screw Threads Inch Translation . . . . . . . . . . . .53DBasic Dimensions for ISO Series Metric Screw Threads From ISO 724. . . . . . . . . .64EOvertapped Nut Thread Class 6AX. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68FInternal Thread Allowance (Fundamental Deviation) Tolerance Position E . . . . .70vFOREWORDIn 1966, ANSI Standards Committee B1 Standardization and Unification of Screw Threads started preparation of a document for ISO Metric Screw Threads based on the current ISOrecommendations and draft documents. Since there were some uncertainties as to the acceptanceof this thread by American industries, the information was published in August 1967 with thetitle, “Interpretative Document Metric Screw Threads B1.13.” This document was never approvedas an ANSI standard.A revision of the information based on the then current ISO standards and recommendationswas published in April 1972 with the title “B1 Report ISO Metric Screw Threads.” Again, thedocument was never approved as an ANSI standard. The document number was thereforeremoved and the status changed to a report.Interest in metric screw threads has grown at a rapid pace over the past several years withthe advent of greater import and export business. The American National Standards Institute,in April 1971, established a committee, ANSI Special Committee to Study Development of anOptimum Metric Fastener System (OMFS). Included in the scope was metric screw threads.Recommendationswere submittedtoajoint ISO/TC1/TC2workinggroup establishedinSeptem-ber 1973 to study the OMFS proposals.An ISO/TC1/TC2 Ad Hoc Advisory Panel meeting in April 1975 in Munich reached a compro-mise between the OMFS recommendations and the existing ISO screw thread system. Thiscompromise was approved, in the main, by the ISO/TC1 in its eleventh plenary meeting inStockholm, June 1976.(a) The first issue of this Standard, designated ANSI B1.13M, was approved as an AmericanNational Standard on February 12, 1979. It provided a system of metric screw threads for generalfastening purposes in mechanisms and structures and was in basic agreement with ISO screwthreadstandardsandresolutionscurrentatthattime.Itfeatureddetailedinformationfordiameter-pitch combinations selected as preferred standard sizes.(b) The 1983 issue of this Standard was designated ANSI/ASME B1.13M-1983 and wasapproved as an American National Standard on August 5, 1983. It updated the 1979 issue toinclude(1) the addition of the new ISO tolerance position f(2) the addition of a section on dimensional accommodation of coating or plating(3) the addition of a section on lead and flank angle tolerances(c) The 1995 issue of this Standard was designated ASME B1.13M-1995 and was approved asan American National Standard on February 20, 1995. It updated the 1983 issue to include(1) the addition of an 8 mm pitch series(2) the addition of standard size M10 ? 1(3) the provision for adjustment of internal thread tolerance class for short and long lengthsof thread engagement, which may be used instead of external thread class adjustment(4) changes in rounding procedures that follow the principles of ASME B1.30M(d) The 2001 issue of this Standard was designated ASME B1.13M-2001 and was approved asan American National Standard on May 22, 2001. It updated the 1995 issue to include(1) incorporation of changes made in the 1998 issue of ISO 261, including addition of diame-ters 125, 130, and 140 in the 8 mm pitch series; and changing of the 7 mm diameter from 3rd to2nd choice in Table 6.(2) recognition of changes made in the 1998 issue of ISO 965-1, including the stating of whenInternational practice permits thread designation without thread class (not USA practice); andmodifying the designation of multiple lead threads to be more in line with ISO practice.(3) incorporation of the new 1998 International Standard, ISO 965-5, by adding Nonmanda-tory Appendix E for Class AX threads.(4) minor changes in some thread root diameters due to modified calculation and roundingprocedures added in ASME B1.30. ASME B1.30 uses rounding upward when the digit followingvithe last rounded place is a 5 followed by zeros. Prior to issue of ASME B1.30, rounding was tothe nearest even digit. Tabulated values appearing in ISO Standards are not subject to roundingrules of ASME B1.30.(5) changes in Circular Runout tolerances.(6) other required updates and corrections.(e) This issue updates the 2001 edition and includes(1) addition of a new Nonmandatory Appendix F to provide a new tolerance position E(2) addition of tolerance class 6h as a preferred class(3) addition of M8 x 1.25 6AX to Nonmandatory Appendix E(4) revision of section 8 on “Dimensional Accommodation of Coating or Plating.” to includeallowances at thread roots and to expand the information on internal threads(5) revision of section 7 to provide thread designations in accordance with ASME Y14.6-2001(6) revision of some tabulated inch translation values in Nonmandatory Appendix C andthe examples of calculation of thread size values in para. 9.4, in accordance with ASME B1.30-2002(7) addition of para. 7.9 for designation of a thread with adjusted size limits(8) other required editorial updates and correctionsSuggestions for improvement of this Standard are welcome. They should be sent to Secretary,ASME B1 Standards Committee, Three Park Avenue, New York, NY 10016-5990.This revision was approved as an American National Standard on September 29, 2005.viiASME B1 COMMITTEEStandardization and Unification of Screw Threads(The following is the roster of the Committee at the time of approval of this Standard.)STANDARDS COMMITTEE OFFICERSA. L. Barrows, ChairD. S. George, Vice ChairA. L. Guzman, SecretarySTANDARDS COMMITTEE PERSONNELG. L. Allen, The L. S. Starrett Co.A. L. Barrows, Kennametal-IPGF. G. Calderone, Corresponding Member, Quality SystemsImplementersL. N. Dixon, Jr., General ElectricR. Dodge, Pennoyer-Dodge Co.G. A. Flannery, Corresponding Member, Mercury Gage Co.H. N. Frost, Defense Supply Center PhiladelphiaJ. O. Gehret III, Vermont Thread GageD. S. George, Ford Motor Co.J. R. Gervasi, Kerr Lakeside, Inc.J. Greenslade, Greenslade and Co.A. L. Guzman, The American Society of Mechanical EngineersR. J. Hukari, SPS TechnologiesL. C. Johnson, The Johnson Gage Co.D. D. Katz, Precision FittingsR. P. Knittel, Leitech-US Ltd.SUBCOMMITTEE 13 METRIC SCREW THREADSE. Schwartz, ChairD. Miskinis, Vice Chair, Kennametal-GreenfieldA. L. Barrows, Kennametal-IPGF. G. Calderone, Corresponding Member, Quality SystemsImplementersR. Dodge, Pennoyer-Dodge Co.D. S. George, Ford Motor Co.J. Greenslade, Greenslade and Co.viiiB. Larzelere, Corresponding Member, Deltronic Corp.L. L. Lord, Corresponding Member, Caterpillar, Inc.M. H. McWilliams, PMC LonestarD. Skierski, Alternate, Sterling Gage and CalibrationD. Miskinis, Kennametal-GreenfieldW. R. Newman, Corresponding Member, ConsultantD. R. Oas, Seaway Bolt and Specials Corp.M. W. Rose, Glastonbury Southern GageW. A. Watts, Alternate, Glastonbury Southern GageE. Schwartz, ConsultantR. H. Searr, Member Emeritus, Mak Tool and GageB. F. Sheffler, Dresser-Rand Co.A. D. Shepherd, Jr., Emuge Corp.R. D. Strong, General Motors Vehicle Engineering CenterA. F. Thibodeau, Member Emeritus, Swanson Tool Manufacturing,Inc.R. E. Vincent, Jr., General Plug Manufacturing Co.C. J. Wilson, Industrial Fasteners InstituteL. L. Lord, Corresponding Member, Caterpillar, Inc.W. R. Newman, Corresponding Member, ConsultantR. D. Strong, General Motors Vehicle Engineering CenterA. F. Thibodeau, Corresponding Member, Swanson ToolManufacturing, Inc.R. E. Vincent, Jr., General Plug Manufacturing Co.C. J. Wilson, Industrial Fasteners InstituteASME B1.13M-2005METRIC SCREW THREADS: M PROFILE1GENERAL1.1 ScopeThis Standard contains general metric standards fora 60 deg symmetrical screw thread with a basic ISO 68-1profile designated M profile. The M profile threads oftolerance class 6H/6g are intended for metric applica-tions where inch class 2A/2B have been used. At theminimum material limits, the 6H/6g results in a looserfit than the 2A/2B. Tabular data is also provided for atighter tolerance fit external thread of class 4g6g, whichisapproximatelyequivalenttotheinchclass3Abutwithan allowance applied. Formulation and tolerancing datais included for applications requiring other fits.NOTE: A 4H5H/4h6h is approximately equivalent to a class3A/3B fit in the inch system.1.2 InterchangeabilityThreads produced to this Standard are fully inter-changeable with threads conforming to other NationalStandards that are based on ISO 68-1 basic profile andISO 965-1 tolerance practices.1.2.1 Assembly.Threads produced in accordancewith M profile and MJ profile (ASME B1.21M) designdata will assemble with each other. However, externalMJ threads will encounter interference on the root radiiwith internal M thread crests when both threads are atmaximum material condition.1.3 ReferencesThe latest issues of the following documents form apart of this Standard to the extent specified herein.ASME B1.3, Screw Thread Gaging Systems forDimensional Acceptability Inch and Metric ScrewThreads (UN, UNR, UNJ, M, and MJ)ASME B1.7M, Nomenclature, Definitions, and LetterSymbols for Screw ThreadsASME B1.16M, Gages and Gaging for Metric M ScrewThreadsASME B1.21M, Metric Screw Threads: MJ ProfileASME B1.30, Screw Threads Standard Practice forCalculating and Rounding DimensionsASME B47.1, Gage BlanksASME Y14.5, Dimensioning and TolerancingPublisher: The American Society of Mechanical Engi-neers (ASME), Three Park Avenue, New York, NY10016-5990; Order Department: 22 Law Drive, Box2900, Fairfield, NJ 07007-29001ASTM F568M, Standard Specification for Carbon andAlloy Steel Externally Threaded Metric FastenersPublisher: The American Society for Testing and Materi-als (ASTM), 100 Barr Harbor Drive, West Consho-hocken, PA 19428-2959ISO 3, Preferred Numbers Series of PreferredNumbersISO 68-1, ISO General Purpose Screw Threads BasicProfile Part 1: Metric Screw ThreadsISO 261, ISO General Purpose Metric Screw Threads General PlanISO 724, ISO Metric Screw Threads Basic DimensionsISO 898-1, Mechanical Properties of Fasteners Part 1:Bolts, Screws, and StudsISO965-1,ISOGeneralPurposeMetricScrewThreadsTolerances Part 1: Principles and Basic DataPublisher: International Organization for Standardiza-tion (ISO), 1 rue de Varembe , Case Postale 56,CH-1211, Gene ve 20, Switzerland/SuisseSAE J1199, Mechanical and Material Requirements forMetric Externally Threaded Steel FastenersPublisher: Society of Automotive Engineers (SAE), 400Commonwealth Drive, Warrendale, PA 15096-00011.4 AcceptabilityAcceptability of product threads shall be in accor-dance with ASME B1.3. Gages and gaging are in accor-dance with ASME B1.16M.1.5 Reference TemperatureThe reference temperature is 20C for dimensionsdefined by this system.1.6 General SymbolsThegeneralsymbolsusedtodescribethemetricscrewthread forms are shown in Table 1.1.7 UnitsAll dimensions and all values in the formulas areexpressed in millimeters unless otherwise noted. Valuesintermsofsharpvee-threadheight(heightoffundamen-tal triangle), H, are used to be consistent with ISO Stan-dards, but actual formulations and calculations arebased on values of pitch, P. See Table 2.1.8 Federal Government UseWhen this Standard is approved by the Departmentof Defense and Federal Agencies and is incorporatedASME B1.13M-2005METRIC SCREW THREADS: M PROFILETable 1General SymbolsSymbolSymbolNote (1)ExplanationNote (1)ExplanationDMajor diameter internal threadD1Minor diameter internal threadD2Pitch diameter internal threaddMajor diameter external threadd1Minor diameter external threadd2Pitch diameter external threadd3Rounded form minor diameterexternal threadPPitchrExternal thread root radiusTToleranceTD1, TD2Tolerances for D1, D2Td, Td2Tolerances for d, d2ESUpper deviation, internal threadequals the allowance (fundamentaldeviation) plus the tolerance. SeeFig. 4.NOTE:(1) Subscripts “bsc,” “max.” and “min.” indicate “basic,” “maximum,” and “minimum” sizes, respectively.EILower deviation, internal threadallowance (fundamental deviation).See Fig. 4.G, HLetter designations for tolerance posi-tions for lower deviation, internalthreadg, hLetter designations for tolerance posi-tions for upper deviation, externalthreadesUpper deviation, external threadallowance (fundamental deviation).See Fig. 4. In the ISO System, es isalways negative for an allowance fitor zero for no allowance.eiLower deviation, external threadequals the allowance (fundamentaldeviation) plus the tolerance. SeeFig. 4. In the ISO system, ei isalways negative for an allowance fit.HHeight of fundamental triangleLELength of engagementLHLeft hand threadinto FED-STD-H28/21, Screw Thread Standards for FederalServicesSection21,theuseofthisStandardbytheFederalGovernmentissubjecttoalltherequirementsandlimita-tions of FED-STD-H28/21.2TERMINOLOGY2.1 Definitionsallowance: the prescribed difference between the design(maximummaterial)size andthebasicsize. Itisnumeri-cally equal to the absolute value of the ISO term funda-mental deviation.NOTE: Allowance is not an ISO metric screw thread term but willbe used together with the ISO term fundamental deviation.basic thread profile: the cyclic outline, in an axial plane,of the permanently established boundary between theprovinces ofthe external andinternal threads.All devia-tions are with respect to this boundary. See Figs. 1 and 4.bolt thread (external thread): the term used in ISO metricthread standards to describe all external threads. Allsymbols associatedwith external threadsare designatedwith lowercase letters. This Standard will refer only toexternal threads in accordance with U.S. practice.2crest diameter: the major diameter of an external threadand the minor diameter of an internal thread.design profiles: the maximum material profiles permittedforexternalandinternalthreadsforaspecifiedtoleranceclass. See Figs. 2 and 3.deviation: in ISO usage, the algebraic difference betweena size (actual, maximum, minimum, etc.) and the corres-ponding basicsize. Theterm deviationdoes notnecessar-ily indicate an error.fit: the general term used to signify range of tightnessor looseness that results from application of a specificcombination of allowances and tolerances in matingparts.fundamentaldeviation:forstandardthreads,thedeviation(upper or lower) closer to the basic size. It is the upperdeviation, es, for an external thread and the lower devia-tion, EI, for an internal thread. See Fig. 4; also see allow-ance and tolerance position.NOTE: The U.S. term allowance will be used as a primary term inthis Standard, where applicable.lower deviation: the algebraicdifference betweenthe min-imum limit of size and the corresponding basic size. Seepara. 5.1.4.METRIC SCREW THREADS: M PROFILEASME B1.13M-2005Table 2Thread Data, M ProfileDifferenceBetween Max.DifferenceTheoretical PitchBetween Min.Diam. and Max.TheoreticalMinor Diam. ofPitch Diam.DifferenceAddendumExternal Thread,and Min.BetweenTruncation ofof InternalDedendumand Min.Height ofDesign MinorMax. MajorInternalThread andof InternalTheoretical PitchInternalDiam. ofand Max.Thread RootTruncationThread andDiam. and Min.Thread andExternalTwice theTheoreticalDoubleand Externalof InternalAddendumMinor Diam. ofDepth ofThread forExternalPitch Diam.Height ofHeight ofThread Crest,Thread,of ExternalInternal Thread,Thread0.125P RootThreadof InternalSharp V-InternalThread,Engagement,Radius,Addendum,Thread,Thread,Thread,H8H4H2Pitch,38H58H0.711325H34H1112HH54HP0.1082532P0.2165064P0.3247595P0.4330127P0.5412659P0.6160254P0.6495191P0.7938566P0.8660254P1.0825318P0.20.021650.043300.064950.086600.108250.123210.129900.158770.173210.216510.250.027060.054130.081190.108250.135320.154010.162380.198460.216510.270630.30.032480.064950.097430.129900.162380.184810.194860.238160.259810.324760.350.037890.075780.113670.151550.189440.215610.227330.277850.303110.378890.40.043300.086600.129900.173210.216510.246410.259810.317540.346410.433010.450.048710.097430.146140.194860.243570.277210.292280.357240.389710.487140.50.054130.108250.162380.216510.270630.308010.324760.396930.433010.541270.60.064950.129900.194860.259810.324760.369620.389710.476310.519620.649520.70.075780.151550.227330.303110.378890.431220.454660.555700.606220.757770.750.081190.162380.243570.324760.405950.462020.487140.595390.649520.811900.80.086600.173210.259810.346410.433010.492820.519620.635090.692820.8660310.108250.216510.324760.433010.541270.616030.649520.793860.866031.082531.250.135320.270630.405950.541270.676580.770030.811900.992321.082531.353161.50.162380.324760.487140.649520.811900.924040.974281.190781.299041.623801.750.189440.378890.568330.757770.947221.078041.136661.389251.515541.8944320.216510.433010.649520.866031.082531.232051.299041.587711.732052.165062.50.270630.541270.811901.082531.353161.540061.623801.984642.165062.7063330.324760.649520.974281.299041.623801.848081.948562.381572.598083.247603.50.378890.757771.136661.515541.894432.156092.273322.778503.031093.7888640.433010.866031.299041.732052.165062.464102.598083.175433.464104.330134.50.487140.974281.461421.948562.435702.772112.922843.572353.897114.8713950.541271.082531.623802.165062.706333.080133.247603.969284.330135.412665.50.595391.190791.786182.381572.976963.388143.572364.366214.763145.9539260.649521.299041.948562.598083.247603.696153.897114.763145.196156.4951980.866031.732052.598083.464104.330134.928205.196156.350856.928208.66025GENERAL NOTES:(a) All dimensions are in millimeters.(b) Rounding in accordance with ASME B1.30.3ASME B1.13M-2005METRIC SCREW THREADS: M PROFILEHP60 deg30 deg90 degAxis of screw threadExternal ThreadsInternal ThreadsD bsc, d bscD2 bsc, d2 bscD1 bsc, d1 bscP/2P/2H/4H/8P/4P/83/8 H5/8 HGENERAL NOTES: H p3/2? P p 0.866025 P0.125 H p 0.108253 P0.250 H p 0.216506 P0.375 H p 0.324760 P0.625 H p 0.541266 PFig. 1Basic M Thread Profile (ISO 68-1 Basic Profile)nut thread (internal thread): a term used in ISO metricthread standards to describe all internal threads. Allsymbols associated with internal threads are designatedwith uppercase letters. This Standard will refer to theterm internal thread in accordance with U.S. practice.tolerance: the total amount of variation permitted for thesize of a dimension. It is the difference between themaximum limit of size and the minimum limit of size(i.e., algebraical difference between the upper deviationand the lower deviation). The tolerance is an absolutevalue without sign. Tolerance for threads is applied tothe design size in the direction of minimum material.Therefore, tolerances are applied as negative values onexternal threads and as positive values on internalthreads.tolerance class: the combination of a tolerance positionwith a tolerance grade. It specifies the allowance (funda-mental deviation) and tolerance for the pitch and major4diameters of external threads and the pitch and minordiameters of internal threads.tolerance grade: a numerical symbol that designates thetolerances of crest diameters and pitch diametersapplied to the design profiles.toleranceposition:alettersymbolthatdesignatestheposi-tion of the tolerance zone in relation to the basic size.Thispositionprovidestheallowance(fundamentaldevi-ation).upperdeviation:thealgebraicdifferencebetweenthemax-imum limit of size and the corresponding basic size. Seepara. SCREW THREAD PROFILE3.1 Basic M Thread ProfileThe basic M thread profile also known as the ISO 68-1BasicProfileformetricscrewthreadsisdepictedinFig.1with the associated dimensions listed in Table 2.METRIC SCREW THREADS: M PROFILEASME B1.13M-2005D min. major diam.D2 min. pitch diam.Basic profileD1 min. minor diam.H/43/8 H5/8 HH/8GENERAL NOTE: For dimensions, see Table 2.Fig. 2Internal Thread, Design M Profile With No Allowance (Fundamental Deviation)(Maximum Material Condition)d max. major diam.d2 max. pitch diam.d1 basic minor diam.(Flat form)d3 nom. minor diam.(Rounded form)Basic profile0.07217H0.17783HR = 0.125P0.69717HH/8H/45/8 H3/8 HGENERAL NOTE: For dimensions, see Table 2.Fig. 3External Thread, Design M Profile With No Allowance (Fundamental Deviation)(Flanks at Maximum Material Condition)5ASME B1.13M-2005METRIC SCREW THREADS: M PROFILEeseiTTTTTeieiesEIESESe or f tolerance position for large allowance (fundamental deviation)g tolerance position for small allowance (fundamental deviation)h tolerance position for no allowance (fundamental deviation)G tolerance position for small allowance (fundamental deviation)H tolerance position for no allowance (fundamental deviation)Zero lineBasicExternalThreadInternalThreadFig. 4Metric Tolerance System for Screw Threads3.2 Design M Profiles3.2.1 Internal Thread.The design M profile for theinternal thread at the no allowance maximum materialcondition is the basic ISO 68-1 profile. See Fig. 2 andthread data in Table External Thread.The design M profile for theexternal thread at the no allowance maximum materialcondition is the basic ISO 68-1 profile except where arounded root is required. For the standard 0.125P min.radius, the ISO 68-1 profile is modified at the root witha 0.17783H truncation blending into two arcs with radiiof 0.125P tangent to the thread flanks. See Fig. 3 andthread data in Table 2.3.3 Crest and Root Forms3.3.1 Rounded Crest and Root Forms.The crest androot tolerance zones at the major and minor diameterswill permit rounded crest and root forms in both theexternal and internal threads.3.3.2 External Thread Root.The root profile of thethread shall lie within the section lined tolerance zoneshown in Fig. 5. For the rounded root thread, the rootprofile of the external thread shall lie within the sectionlined rounded root tolerance zone shown in Fig. 5. Theprofile shall be a continuous smoothly blended nonre-versing curve, no part of which shall have a radius ofless than 0.125P, which is tangential to the thread flank.6The profile may comprise tangent flank arcs that arejoined by a tangential flat at the root. The limit valuesoftherootradiusrarespecifiedinTable3.Themaximumtruncation is:H4 r min.?1 cos?60 deg arc cos?1 Td24 r min.?and the minimum truncation is 0.14434H. (See Fig. 5.)The M profile with a minimum root radius of 0.125P onthe external thread is desirable for all threads but isrequiredforthreadedmechanicalfastenersofSAEJ1199,ASTM F 568M, and ISO 898-1 property class 8.8 (mini-mumtensilestrength800MPa)andstronger.(SeeFig.5.)3.3.3 Internal Thread Root.The root profile shall notbe smaller than the basic profile. The maximum majordiameter shall not be sharp.4SERIES OF THREADS4.1 Standard Coarse Pitch General Purpose andMechanical Fastener Series, M ProfileThe standard metric screw thread series for generalpurpose equipments threaded components design andmechanical fasteners is a coarse thread series. Theirdiameter/pitch combinations are listed in Table 4.NOTE: The words coarse and fine are given in order to conformto usage. No concept of quality shall be associated with theseMETRIC SCREW THREADS: M PROFILEASME B1.13M-2005d3 min. minor diam.Point of intersection0.14434H min. truncationRounded form max. truncation (see para. 3.3.2)r min. = 0.125P0.5 Td20.5 es0.5 esPoint of intersectionBasic M profileUpper limiting profile for rounded root Note (1)r min. = 0.125Pr min. = 0.125Pd3 max. rounded formminor diam.d2 basic pitch diam.d1 basic minor diam.d1 max. flat form minor diam. (shown with allowance)H/4P/4GENERAL NOTE: Section-lined portions identify tolerance zone and unshaded portions identify allowance (fundamentaldeviation).NOTE:(1) The upper limiting profile for rounded root form allows no tolerance for flank wear of a tool producing it and istherefore not to be used as a design profile. Rather, it is an indication of the limiting acceptable condition for therounded root form which will pass a GO thread gage.Fig. 5M Profile, External Thread Root, Upper and Lower Limiting Profiles for r min.p0.125P and forFlat Root Form (Shown for Tolerance Position g)words. Coarse pitches only indicate the largest metric pitches usedin current practice.4.2 Standard Fine Pitch M Profile Screw ThreadsTable 5 lists additional diameter/pitch combinationsthat are standard for general purpose equipmentsthreaded components design.4.3 Preferred SizesDiameter/pitch combinations shown in Table 4 arethe preferred sizes and should be the first choice, asapplicable.4.4 ISO Metric Thread SeriesThe Thread Series given in Table 6 are identical tothose published in ISO 261 for diameters of 1.6 mm andlarger. Diameter/pitch combinations from Tables 4 and75 are shown in boldface. Selection of series shown inregular type shall be limited to unusual requirementswhere the selections in accordance with paras. 4.1, 4.2,and 4.3 cannot be used.5ALLOWANCES AND TOLERANCES5.1 ISO System of Limits and Fits as Applied toScrew Threads5.1.1 General.The international metric tolerance sys-tem is based on a system of limits and fits. The limits ofthe tolerances on the mating parts and their allowances(fundamental deviations)determine thefit ofthe assem-bly.Forsimplicity,thesystem isdescribedforcylindricalparts. Holes are equivalent to internally threaded sur-faces and shafts to externally threaded surfaces.ASME B1.13M-2005METRIC SCREW THREADS: M PROFILETable 3Limit Values for M Profile MinimumRounded Root RadiusMin. RootMin. RootRadius,Radius,P0.125PP0.125P0.20.0250.250.0310.30.0380.350.0440.40.0500.450.0560.50.0630.60.0750.70.0880.750.0940.80.10010.1251.250.1561.50.1881.750.21920.2502.50.31330.3753.50.43840.5004.50.56350.6255.50.68860.75081.000GENERAL NOTE: All dimensions are in millimeters.Table 4Standard Coarse Pitch M Profile GeneralPurpose and Mechanical Fastener SeriesNominalNominalSizePitchSizePitch1.60.35540.750.86181.25101.5121.75142162202.5222.5 Note (1)243273 Note (1)303.5364424.5485565.5646726 Note (2)806 Note (2)906 Note (2)1006 Note (2)GENERAL NOTE: All dimensions are in millimeters.NOTES:(1) For high strength structural steel fasteners only.(2) Designated as part of 6 mm fine pitch series in ISO 2 Basic Size.This is the zero line or surface atassembly, where the interface of the two mating partshave a common reference.5.1.3 Upper Deviation.This is the algebraic differencebetween the maximum limit of size and the basic size.It is designated by the French term e cart superieur (ESfor holes and es for shafts).8Table 5Standard Fine Pitch M Profile ScrewThreadsNominalNominalSizePitchSizePitch81. . . . .100.7511.251211.51.2514. . . . .1.5151. . . . .16. . . . .1.5171. . . . .18. . . . .1.5201. . .1.522. . . . .1.524. . . . .2251.5. . . . .27. . . . .2301.5. . .233. . . . .2351.5. . . . .36. . . . .239. . . . .2401.5. . . . .42. . . . .2451.5. . . . .48. . . . .2501.5. . . . .551.5. . .56. . .2601.5. . .64. . .2651.5. . .701.5. . .72. . .2751.5. . .801.5285. . .290. . .295. . .2100. . .2105. . .2110. . .2120. . .2130. . .2140. . .2150. . .2160. . .3170. . .3180. . .3190. . .3200. . .3GENERAL NOTE: All dimensions are in millimeters.5.1.4 Lower Deviation.This is the algebraic differencebetween the minimum limit of size and the basic size.It is designated by the French term e cart inferieur (EI forholes and ei for shafts).5.1.5 FundamentalDeviations(Allowances).Thesearethe deviations that are closest to the basic size. In Fig.4 they would be EI and es. Fundamental deviations aredesignated by alphabetical letters. See para. .6 Fits.Fits are determined by the fundamentaldeviation, which may be positive or negative, assignedto the mating parts. The selected fits can be clearance,transition, and interference. To illustrate fits schemati-cally, a zero line is drawn to represent the basic size. Byconvention, the shaft always lies below the zero line andthe hole lies above the zero line (except for interferencefits). This makes the fundamental deviation negativefor the shaft and equal to its upper deviation, es. Thefundamental deviation is positive for the hole and equalto its lower deviation, EI. See Fig. Tolerance.Defined by a series of numericalgrades, each grade provides numerical values for nomi-nal sizes corresponding to the standard tolerance. Seepara. 5.2. When the tolerance is applied to the schematicMETRIC SCREW THREADS: M PROFILEASME B1.13M-2005Table 6ISO 261 Diameter/Pitch Combinations From Which the Standards Were SelectedNominal DiametersPitchesCol. 1Col. 2Col. 3Fine1st2nd3rdChoiceChoiceChoiceCoarse321.51.2510.750.50.30.35. . . . . . . . . . . . . . . . . . .5. . . . . . . . . . . . . . . . . . .0.220.4. . . . . . . . . . . . . . . . .0.25. . .2.20.45. . . . . . . . . . . . . . . . .0.25. . .2.50.45. . . . . . . . . . . . . . .0.35. . . . .30.5. . . . . . . . . . . . . . .0.35. . . . .3.50.6. . . . . . . . . . . . . . .0.35. . . . .40.7. . . . . . . . . . . . .0.5. . . . . . .4.50.75. . . . . . . . . . . . .0.5. . . . . . .50.8. . . . . . . . . . . . .0.5. . . . . . .5.5. . . . . . . . . . . . . . .0.5. . . . . . .61. . . . . . . . . . .0.75. . . . . . . . .71. . . . . . . . . . .0.75. . . . . . . . .81.25. . . . . . . . .10.75. . . . . . . . .91.25. . . . . . . . .10.75. . . . . . . . .101.5. . . . . . .1.2510.75. . . . . . . . .111.5. . . . . . . . .10.75. . . . . . . . .121.75. . . . .1.51.251. . . . . . . . . . .142. . . . .1.51.25 Note (1)1. . . . . . . . . . .15. . . . . . .1.5. . .1. . . . . . . . . . .162. . . . .1.5. . .1. . . . . . . . . . .17. . . . . . .1.5. . .1. . . . . . . . . . .182.5. . .21.5. . .1. . . . . . . . . . .202.5. . .21.5. . .1. . . . . . . . . . .222.5Note (2). . .21.5. . .1. . . . . . . . . . .243. . .21.5. . .1. . . . . . . . . . .25. . . . .21.5. . .1. . . . . . . . . . .26. . . . . . .1.5. . . . . . . . . . . . . . .273Note (2). . .21.5. . .1. . . . . . . . . . .28. . . . .21.5. . .1. . . . . . . . . . .303.5(3) Note (3)21.5. . .1. . . . . . . . . . .32. . . . .21.5. . . . . . . . . . . . . . .333.5(3) Note (3)21.5. . . . . . . . . . . . . . .35Note (4). . . . . . .1.5. . . . . . . . . . . . . . .364321.5. . . . . . . . . . . . . . .38. . . . . . .1.5. . . . . . . . . . . . . . .394321.5. . . . . . . . . . . . . . .9ASME B1.13M-2005METRIC SCREW THREADS: M PROFILETable 6ISO 261 Diameter/Pitch CombinationsFrom Which the Standards Were Selected (Contd)Nominal DiametersPitchesCol. 1Col. 2Col. 3Fine1st2nd3rdChoiceChoiceChoiceCoarse864321.540. . . . . . . . .321.5424.5. . . . .4321.5454.5. . . . .4321.5485. . . . .4321.550. . . . . . . . .321.5525. . . . .4321.555. . . . . . .4321.5565.5. . . . .4321.558. . . . . . .4321.5605.5. . . . .4321.562. . . . . . .4321.5646. . . . .4321.565. . . . . . .4321.5686. . . . .4321.570. . . . .64321.572. . . . .64321.575. . . . . . .4321.576. . . . .64321.578. . . . . . . . . . .2. . .80. . . . .64321.582. . . . . . . . . . .2. . .85. . . . .6432. . .90. . . . .6432. . .95. . . . .6432. . .100. . . . .6432. . .105. . . . .6432. . .110. . . . .6432. . .115. . . . .6432. . .120. . . . .6432. . .125. . .86432. . .130. . .86432. . .135. . . . .6432. . .140. . .86432. . .145. . . . .6432. . .150. . .86432. . .155. . . . .643. . . . .160. . .8643. . . . .165. . . . .643. . . . .170. . .8643. . . . .175. . . . .643. . . . .180. . .8643. . . . .10METRIC SCREW THREADS: M PROFILEASME B1.13M-2005Table 6ISO 261 Diameter/Pitch CombinationsFrom Which the Standards Were Selected (Contd)Nominal DiametersPitchesCol. 1Col. 2Col. 3Fine1st2nd3rdChoiceChoiceChoiceCoarse864321.5185. . . . .643. . . . .190. . .8643. . . . .195. . . . .643. . . . .200. . .8643. . . . .205. . . . .643. . . . .210. . .8643. . . . .215. . . . .643. . . . .220. . .8643. . . . .225. . . . .643. . . . .230. . .8643. . . . .235. . . . .643. . . . .240. . .8643. . . . .245. . . . .643. . . . .250. . .8643. . . . .255. . . . .64. . . . . . .260. . .864. . . . . . .265. . . . .64. . . . . . .270. . .864. . . . . . .275. . . . .64. . . . . . .280. . .864. . . . . . .285. . . . .64. . . . . . .290. . .864. . . . . . .295. . . . .64. . . . . . .300. . .864. . . . . . .GENERAL NOTE: All dimensions are in millimeters.NOTES:(1) Only for spark plugs for engines.(2) Only for high strength structural steel fasteners.(3) Pitches shown in parentheses are to be avoided as far as possible.(4) Only for nuts for bearings.diagram, the tolerance for the part (shaft) continues tobe negative. Thus, the tolerance plus the fit define thelower deviation, ei. The tolerance for the mating part(hole) continues to be positive. Thus, the tolerance plusthefitdefinetheupperdeviation,ES.Aschematicexam-ple of the metric tolerance system as applied to metricscrew threads is shown in Fig. 4.5.2 Tolerance Grade(a) This is indicated by a number. The system pro-vides for a series of tolerance grades for each of the fourscrew thread parameters (D1, d, D2, d2). The tolerancegrades for this Standard were selected from those givenin ISO 965-1.11(b) The underlined tolerance grades are used withnormal length of thread engagement.ToleranceCharacteristicGradeApplicable TableMinordiameterof4, 5, 6, 7, 8Table 9internal threadsMajordiameterof4,6,8Table 10external threadsPitch diameter of inter-4, 5, 6, 7, 8Table 12nal threadsPitchdiameterofexter-3, 4, 5, 6, 7, 8, 9Table 11nal threadsASME B1.13M-2005METRIC SCREW THREADS: M PROFILE5.3 Tolerance Position(a) This is indicated by a letter. This position is theallowance (fundamental deviation). A capital letter isusedforinternalthreadsandalowercaseletterforexter-nal threads. The system provides a series of tolerancepositions for internal and external threads. These toler-ance positions are as follows with the numerical valuesgiven in the appropriate table.(b) The underlined letters are used in this Standard.Internal ThreadsG, HTable 13External Threadse, f, g, hTable 135.4 Allowance/Tolerance Formulas and Tables(a) See section 6 for pitch and crest diameter allow-ance/tolerance formulas and tables.(b) Functional diameter size includes the effects of allvariations in pitch diameter, thread form, and profile.The variations in the individual thread characteristicssuch as flank angle, lead, taper, and roundness on agiventhread, causethemeasurements ofthe pitchdiam-eter and functional diameter to vary from one anotheron most threads. The pitch diameter and functionaldiameter on a given thread are equal to one anotheronly when the thread form is perfect. When required toinspect either the pitch diameter, the functional diame-ter, or both, for thread acceptance (see ASME B1.3), usethe same limits of size for the appropriate thread sizeand class.5.5 Selected Tolerance Classes5.5.1 External Thread Tolerance Classes.Small allow-ance (fundamental deviation)(a) for normal tolerance tolerance class 6g6g(b) for tighter tolerance tolerance class 4g6g(c) for a no-allowance fit at maximum material, suchas for a plated 6g6g tolerance class 6h6h5.5.2 Internal Thread Tolerance Class.No allowance(fundamental deviation). Tolerance class 6H6H. Internalthreads with allowance are not standard practice.5.6 Length of Thread Engagement5.6.1 NormalLengthofThreadEngagement.Thepitchdiameter tolerances specified herein are applicable tothe limits of the normal length of thread engagementLE in Table 7. The limits were calculated by formulasgiven in para. .2 Short and Long Lengths of Thread EngagementWhen Gaged With Normal Length Contacts.For short LElength of thread engagement, reduce the pitch diametertolerance of the external thread by one tolerance gradenumber. For long LE length of thread engagement,increase the allowance (fundamental deviation) at thepitch diameter of the external thread. For internal12threads with long LE length of thread engagement, pro-vide an allowance (fundamental deviation) correspond-ing to the next larger tolerance position. Thus, for thestandard H position (no allowance), a tolerance positionG would be provided. For assemblies with short or longlengths of engagement, the tolerance class adjustmentmay be applied to only one member. See Table 8.5.7 Circular RunoutCircular runout is the full indicator movement (FIM)(see ASME Y14.5). Runout of the crest (minor diameterof internal thread or major diameter of external thread)relative to the pitch cylinder shall not be so great thatthe basic profile is transgressed.5.7.1 Internal Thread.When measurement is speci-fied, the runout of the minor diameter cylinder relativeto the pitch cylinder on the internal thread shall notexceed the difference between the measured minordiameterandthebasic minordiameter.Anout-of-roundpitch cylinder may reduce the available runout.5.7.2 External Thread.When measurement is speci-fied, the runout of the major diameter cylinder relativeto the pitch cylinder on the external thread shall notexceedthedifferencebetweenthemeasuredmajordiam-eterandthebasicmajordiameter.Anout-of-roundpitchcylinder may reduce the available runout.5.8 Lead and Flank Angle TolerancesSee section 10.5.9 Coated or Plated ThreadsSee section 8 for dimensional accommodation andlimits for coated threads.6DESIGN FORMULAS AND TABULATED VALUESFOR ALLOWANCES AND TOLERANCES6.1 GeneralThis section provides the formulas and tabulated val-ues for ISO allowances and tolerances in accordancewith ISO 965-1. It is to be used for size limit calculationfor non-standard threads, when required. See para. 9.2for applications and limitations of formulas and tables.6.2 Rounding Procedure for Tabulated Values(a) The values for crest and pitch diameter tolerances(Tables 9, 10, 11, and 12), for length of engagement(Table 7), and for allowances/fundamental deviations(Table 13) have been calculated from formulas and thenrounded off to the nearest values in the R40 series ofpreferrednumbersinaccordancewithISO3forthethreedecimalplacesrequired.Ifafourthdecimalplaceresults,it is further rounded.METRIC SCREW THREADS: M PROFILEASME B1.13M-2005Table 7Length of Thread Engagement (ISO 965-1)Length of Thread EngagementBasic Major Diameter,d bscShort LENormal LELong LEUp to andPitch,Up to andUp to andOverIncludingPIncludingOverIncludingOver0.32.60.411330.40.351131.71.7550.722660.75.611.20.77.1133991.254412121.555151511.222.413.83.8111316161.7566181828824242.51010303022.44514412191928.58.525253121236363.5151545454181853534.5212163634590222229.59.528283151545454191956565242471715.5282885856323295959018021212363631818535342424717163636106106845451321321803553202060604262680806404011811885050150150GENERAL NOTE: All dimensions are in millimeters.13ASME B1.13M-2005METRIC SCREW THREADS: M PROFILETable 8Examples of Tolerance Classes Requiredfor Normal Gage Length Contacts With VariousThread Engagement LengthsNormal LEShort LELong LE6g5g6g6e6g4g6g3g6g4e6g6h Note (1)5h6h6g6h4h6h Note (1)3h6h4g6h6H5H6G4H6H3H6H4G6GGENERAL NOTE: See para. 5.6.2.NOTE:(1) Applies to maximum material functional size (GO Thread gage)for plated 6g and 4g6g class threads, respectively.Table 9Minor Diameter Tolerances of Internal Thread, TD1(ISO 965-1)Tolerance GradePitch,P456 Note (1)780.20.038. . . . . . . . .0.250.0450.056. . . . . . .0.30.0530.0670.085. . . . .0.350.0630.0800.100. . . . .0.40.0710.0900.112. . . . .0.450.0800.1000.125. . . . .0.50.0900.1120.1400.180. . .0.60.1000.1250.1600.200. . .0.70.1120.1400.1800.224. . .0.750.1180.1500.1900.236. . .0.80.1250.1600.2000.2500.31510.1500.1900.2360.3000.3751.250.1700.2120.2650.3350.4251.50.1900.2360.3000.3750.4751.750.2120.2650.3350.4250.53020.2360.3000.3750.4750.6002.50.2800.3550.4500.5600.71030.3150.4000.5000.6300.8003.50.3550.4500.5600.7100.90040.3750.4750.6000.7500.9504.50.4250.5300.6700.8501.06050.4500.5600.7100.9001.1205.50.4750.6000.7500.9501.18060.5000.6300.8001.0001.25080.6300.8001.0001.2501.600GENERAL NOTE: All dimensions are in millimeters.NOTE:(1) Tabulated in this Standard for M Internal Threads.14METRIC SCREW THREADS: M PROFILEASME B1.13M-2005Table 10Major Diameter Tolerances of ExternalThread, Td (ISO 965-1)Tolerance GradePitch,P46 Note (1)80.20.0360.056. . .0.250.0420.067. . .0.30.0480.075. . .0.350.0530.085. . .0.40.0600.095. . .0.450.0630.100. . .0.50.0670.106. . .0.60.0800.125. . .0.70.0900.140. . .0.750.0900.140. . .0.80.0950.1500.23610.1120.1800.2801.250.1320.2120.3351.50.1500.2360.3751.750.1700.2650.42520.1800.2800.4502.50.2120.3350.53030.2360.3750.6003.50.2650.4250.67040.3000.4750.7504.50.3150.5000.80050.3350.5300.8505.50.3550.5600.90060.3750.6000.95080.4500.7101.180GENERAL NOTE: All dimensions are in millimeters.NOTE:(1) Tabulated in this Standard for M External Threads.(b) These rules of rounding have not always beenused in order to produce a smooth progression. Sameas ISO 965-1.(c) The above procedures often result in a variationby one or more numerals in the last decimal place whencomparing table and formula values.6.3 Allowances (Fundamental Deviations)The allowances (fundamental deviations) for internaland external threads have been calculated according tothe following formulas and their rounded values givenin Table 13. Allowance is the absolute value of funda-mental deviation.InternalExternalEIGp + (0.015 + 0.011P)esep (0.05 + 0.011P) Note (1)EIHp 0esfp (0.03 + 0.011P)esgp (0.015 + 0.011P)eshp 015NOTE:(1) Exceptions are values for threads with P 0.45 mm.6.4 Length of Thread EngagementFor the calculation of the limits of the normal lengthof thread engagement in Table 7, the following formulashave been used and their values rounded.For each pitch, P, within a certain diameter range, dhas been set equal to the smallest diameter within thetable range.Normal LE min. p 2.24Pd0.2Normal LE max. p 6.7Pd0.26.5 Crest Diameter Tolerances6.5.1 Tolerances for Minor Diameter of InternalThread, TD1.The TD1tolerances for grade 6 are calcu-lated according to the following formulas and rounded:(a) Pitches 0.2 mm to 0.8 mmTD1(6) p 0.433P 0.190P1.22(b) Pitches 1 mm and coarserTD1(6) p 0.230P.1The following rounded TD1tolerance val-ues for the other grades are obtained from the TD1(6)values (in Table 9):ToleranceGradeTolerance4TD1(4) p 0.63TD1(6)5TD1(5) p 0.8TD1(6)6TD1(6)7TD1(7) p 1.25TD1(6)8TD1(8) p 1.6TD1(6)6.5.2 Tolerances for Major Diameter of ExternalThread, Td, Grade 6.The Td tolerances for grade 6 arecalculated according to the following formula androunded:Td (6) p 0.18?3P20.00315?PThefollowingrounded Tdtolerancevaluesfor the other grades are obtained from the Td (6) values(see Table 10):ToleranceGradeTolerance4Td (4) p 0.63Td (6)6Td (6)8Td (8) p 1.6Td (6)6.6 Pitch Diameter Tolerances6.6.1 TolerancesforPitchDiameterofExternalThread,Td2.Td2(6) values in Table 11 are calculated accordingto the following formula and rounded. (d is equal to theASME B1.13M-2005METRIC SCREW THREADS: M PROFILETable 11Pitch Diameter Tolerance of External Thread, Td2(ISO 965-1)Basic Major Diameter, dTolerance GradeUp to andPitch,OverIncludingP34 Note (1)56 Note (1)780.0250.0320.0400.050. . . . . . .0.250.0280.0360.0450.056. . . . . . .0.350.0320.0400.0500.0630.080. . . . .0.40.0340.0420.0530.0670.085. . . . .0.450.0360.0450.0560.0710.090. . . . .50.0340.0420.0530.0670.085. . . . .0.50.0380.0480.0600.0750.095. . . . .0.60.0420.0530.0670.0850.106. . . . .0.70.0450.0560.0710.0900.112. . . . .0.750.0450.0560.0710.0900.112. . . . .0.80.0480.0600.0750.0950.1180.1500.1905.611.20.750.0500.0630.0800.1000.125. . . . .10.0560.0710.0900.1120.1400.1800.2241.250.0600.0750.0950.1180.1500.1900.2361.50.0670.0850.1060.1320.1700.2120.26511.222.410.0600.0750.0950.1180.1500.1900.2361.250.0670.0850.1060.1320.1700.2120.2651.50.0710.0900.1120.1400.1800.2240.2801.750.0750.0950.1180.1500.1900.2360.30020.0800.1000.1250.1600.2000.2500.3152.50.0850.1060.1320.1700.2120.2650.33522.44510.0630.0800.1000.1250.1600.2000.2501.50.0750.0950.1180.1500.1900.2360.30020.0850.1060.1320.1700.2120.2650.33530.1000.1250.1600.2000.2500.3150.4003.50.1060.1320.1700.2120.2650.3350.42540.1120.1400.1800.2240.2800.3550.4504.50.1180.1500.1900.2360.3000.3750.47545901.50.0800.1000.1250.1600.2000.2500.31520.0900.1120.1400.1800.2240.2800.35530.1060.1320.1700.2120.2650.3350.42540.1180.1500.1900.2360.3000.3750.47550.1250.1600.2000.2500.3150.4000.5005.50.1320.1700.2120.2650.3350.4250.53060.1400.1800.2240.2800.3550.4500.5609018020.0950.1180.1500.1900.2360.3000.37530.1120.1400.1800.2240.2800.3550.45040.1250.1600.2000.2500.3150.4000.50060.1500.1900.2360.3000.3750.4750.60080.1700.2120.2650.3350.4250.5300.67018035530.1250.1600.2000.2500.3150.4000.50040.1400.1800.2240.2800.3550.4500.56060.1600.2000.2500.3150.4000.5000.63080.1800.2240.2800.3550.4500.5600.710GENERAL NOTE: All dimensions are in millimeters.NOTE:(1) Tabulated in this Standard for M Threads.16METRIC SCREW THREADS: M PROFILEASME B1.13M-2005Table 12Pitch Diameter Tolerance of Internal Thread, TD2(ISO 965-1)Basic Major Diameter, DTolerance GradeUp to andPitch,OverIncludingP456 Note (1)70.042. . . . . . . . .0.250.0480.060. . . . . . .0.350.0530.0670.085. . . . .0.40.0560.0710.090. . . . .0.450.0600.0750.095. . . . .50.0560.0710.090. . . . .0.50.0630.0800.1000.125. . .0.60.0710.0900.1120.140. . .0.70.0750.0950.1180.150. . .0.750.0750.0950.1180.150. . .0.80.0800.1000.1250.1600.2005.611.20.750.0850.1060.1320.170. . .10.0950.1180.1500.1900.2361.250.1000.1250.1600.2000.2501.50.1120.1400.1800.2240.28011.222.410.1000.1250.1600.2000.2501.250.1120.1400.1800.2240.2801.50.1180.1500.1900.2360.3001.750.1250.1600.2000.2500.31520.1320.1700.2120.2650.3352.50.1400.1800.2240.2800.35522.44510.1060.1320.1700.212. . .1.50.1250.1600.2000.2500.31520.1400.1800.2240.2800.35530.1700.2120.2650.3350.4253.50.1800.2240.2800.3550.45040.1900.2360.3000.3750.4754.50.2000.2500.3150.4000.50045901.50.1320.1700.2120.2650.33520.1500.1900.2360.3000.37530.1800.2240.2800.3550.45040.2000.2500.3150.4000.50050.2120.2650.3350.4250.5305.50.2240.2800.3550.4500.56060.2360.3000.3750.4750.6009018020.1600.2000.2500.3150.40030.1900.2360.3000.3750.47540.2120.2650.3350.4250.53060.2500.3150.4000.5000.63080.2800.3550.4500.5600.71018035530.2120.2650.3350.4250.53040.2360.3000.3750.4750.60060.2650.3350.4250.5300.67080.3000.3750.4750.6000.750GENERAL NOTE: All dimensions are in millimeters.NOTE:(1) Tabulated in this Standard for M Threads.17ASME B1.13M-2005METRIC SCREW THREADS: M PROFILETable 13Allowance (Fundamental Deviation) for Internal and External Threads (ISO 965-1)Allowance (Fundamental Deviation) Note (1)Internal Thread,External Thread,D2, D1d, d2Pitch,G,H Note (2),e,f,g Note (3),h,PEIEIeseseses0.2+0.0170. . . . .0.01700.25+0.0180. . . . .0.01800.3+0.0180. . . . .0.01800.35+0.0190. . .0.0340.01900.4+0.0190. . .0.0340.01900.45+0.0200. . .0.0350.02000.5+0.02000.0500.0360.02000.6+0.02100.0530.0360.02100.7+0.02200.0560.0380.02200.75+0.02200.0560.0380.02200.8+0.02400.0600.0380.02401+0.02600.0600.0400.02601.25+0.02800.0630.0420.02801.5+0.03200.0670.0450.03201.75+0.03400.0710.0480.03402+0.03800.0710.0520.03802.5+0.04200.0800.0580.04203+0.04800.0850.0630.04803.5+0.05300.0900.0700.05304+0.06000.0950.0750.06004.5+0.06300.1000.0800.06305+0.07100.1060.0850.07105.5+0.07500.1120.0900.07506+0.08000.1180.0950.08008+0.10000.1400.1180.1000NOTES:(1) Allowance is the absolute value of Fundamental Deviation.(2) Tabulated in this Standard for M Internal Threads.(3) Tabulated in this Standard for M External Threads.geometrical mean value of the diameter range limits,i.e., the square root of the product of smallest and largestdiameters.)Td2(6) p 0.09P0.4d.1The following rounded Td2tolerance val-ues for the other grades are obtained from the Td2(6)values (see Table 11). No Td2values are given in Table 11when values calculated according to the given formulaexceed the Td values in the tolerance grades, which arecombined in the tables for recommended toleranceclasses.18ToleranceGradeTolerance3Td2(3) p 0.5Td2(6)4Td2(4) p 0.63Td2(6)5Td2(5) p 0.8Td2(6)6Td2(6)7Td2(7) p 1.25Td2(6)8Td2(8) p 1.6Td2(6)9Td2(9) p 2Td2(6)6.6.2 TolerancesforPitchDiameterofInternalThread,TD2.The rounded TD2tolerance values in Table 12 arecalculated using formulas below and Td2(6) values fromMETRIC SCREW THREADS: M PROFILEASME B1.13M-2005Table 11. No TD2values are given in Table 12 whenvalues calculated according to the given formulaexceed 0.25P.ToleranceGradeTolerance4TD2(4) p 0.85Td2(6)5TD2(5) p 1.06Td2(6)6TD2(6) p 1.32Td2(6)7TD2(7) p 1.7Td2(6)8TD2(8) p 2.12Td2(6)7DESIGNATION OF SCREW THREADS7.1 General(a) The complete designation of a screw thread givesthe thread symbol, the nominal size, the pitch, and thethread tolerance class.(b) Thetoleranceclassdesignationgivestheclassdes-ignation for the pitch diameter tolerance followed by aclass designation for the crest diameter (major diameterfor external thread and minor diameter for internalthread) tolerances.(c) Theclassdesignationconsistsofanumberindicat-ing the tolerance grade followed by a letter indicatingthe tolerance position.EXAMPLE:Thread tolerance class designation for pitch diameterThread tolerance class designation for major diameterThread class designation for pitch and minor diameter with identical tolerance class designationsTolerance classInternal threadExternal thread6g6H4g7.2 Designation of Standard Screw ThreadsMetric screw threads are identified by the letter (M)for the thread form profile, followed by the nominaldiameter size and the pitch expressed in millimeters,separated by the sign (?) and followed by the toleranceclass separated by a dash () from the pitch.The simplified international practice for designatingcoarse pitch M profile screw threads is to leave off thepitch. Thus a M14 ? 2 thread is designated as just M14.To prevent misunderstanding, it is mandatory to use thevalue for pitch in all designations.International practice permits a thread designationwith tolerance class not specified for classes 6H and 6g.To prevent misunderstanding, it is mandatory to specifythe tolerance class for all thread designations.19Thread acceptability gaging system requirements ofASME B1.3 may be added to the thread size designationas noted in examples or as specified in pertinent docu-mentation, such as the drawing or procurement doc-ument.(a) Internal Thread M Profile, Right HandMetric thread symbol, ISO 68-1 Metric thread formNominal sizeTolerance classTolerance positionTolerance gradeTolerance gradeTolerance positionM6x 1 5H6H(21)PitchGaging systemMinor diameterTolerance symbolPitch diameterTolerance symbol(b) External Thread M Profile, Right HandMetric thread symbol, ISO 68-1 Metric thread formNominal sizeTolerance classTolerance positionTolerance gradeTolerance gradeTolerance positionM6x 1 4g6g(22)PitchGaging systemMajor diameterTolerance symbolPitch diameterTolerance symbolUnless otherwise specified in the designation, thescrew thread helix is right hand.7.2.1 Designation of Left-Hand Thread.When left-hand thread is specified, the tolerance class designationis followed by a dash and LH.EXAMPLE:M6 ? 1 5H6H LH (23)7.2.2 Designation of Identical Tolerance Classes.Ifthe two tolerance class designations for a thread areidentical, it is not necessary to repeat the symbols.EXAMPLE:M6 ? 1 6H (21)ASME B1.13M-2005METRIC SCREW THREADS: M PROFILE7.2.3 Designations Using All Capital Letters.Whencomputer and teletype thread designations use all capi-tal letters, the external or internal thread may need fur-theridentification.Thusthetoleranceclassidentificationis followed by the abbreviations EXT or INT in capitalletters.EXAMPLES:M6 ? 1 4G6G EXTM6 ? 1 6H INT7.3 Designation of Thread FitA fit between mating threads is indicated by the inter-nalthreadtoleranceclassfollowedbytheexternalthreadtolerance class separated by a slash.EXAMPLES:M6 ? 1 6H/6gM6 ? 1 6H/4g6g7.4 Designation of Rounded Root External Thread7.4.1 Modified ISO 68-1 Thread With Radius Rootr min. p 0.125P.For the mandatory condition-externalfasteners of property class 8.8 and stronger (seepara. 3.3.2), no special designation is required. Otherparts requiring a 0.125P root radius must specify thatradius as in para. .4.2 Designation of Special Rounded Root Thread.Whenaspecialroundedrootthreadisrequired,itsexter-nal thread designation is suffixed by the letter R andthe minimum root radius value in millimeters.EXAMPLE:Minimum Root RadiusM42 ? 4.5 6g R0.637.5 Designation of Threads Having Modified CrestsWhere the limits of size of the major diameter of anexternal thread or the minor diameter of an internalthread are modified, the thread designation is suffixedby the letters MOD followed by the modified diameterlimits.EXAMPLE: External thread M profile, major diameter reduced0.075 mm.M6 ? 1 4h6h MODMAJOR DIA 5.745 5.925 MODEXAMPLE: Internal thread M profile, minor diameter increased0.075 mm.M6 ? 1 4H5H MODMINOR DIA 5.101 5.291 MOD7.6 Designation of Special ThreadsSpecial diameter-pitch threads, developed in accor-dance with this Standard, shall be identified by the let-ters SPL following the tolerance class. Below thedesignation shall be specified the limits of size for majordiameter, pitch diameter, and minor diameter.20EXAMPLE: External threadM6.5 ? 1 4h6h SPL (22)MAJOR DIA 6.320 6.500PD 5.779 5.850MINOR DIA 5.163 5.386EXAMPLE: Internal threadM6.5 ? 1 4H5H SPL (23)MAJOR DIA 6.500 MIN.PD 5.850 5.945MINOR DIA 5.417 5.6077.7 Designation of Multiple Start ThreadsWhen a thread is required with a multiple start, itis designated by specifying sequentially M for metricthread, nominal diameter size, ?, L for lead, lead value,P for pitch, pitch value, parenthesis, number of starts,and the word “Starts,” close parenthesis, dash, toler-ance class.EXAMPLES:M16 ? L4P2 (2 STARTS) 4h6hM14 ? L6P2 (3 STARTS) 6H7.8 Designation of Coated or Plated Threads7.8.1 Designation of Coated or Plated M Threads.Specify if the tolerance class is after coating or afterplating.If nodesignation ofafter coatingorafter platingis specified, the tolerance class applies before coating orplating in accordance with ISO practice. After plating,the thread profile shall not transgress the maximummaterial limits for the tolerance position H/h.EXAMPLES:M6 ? 1 6h AFTER COATING or AFTER PLATINGM6 ? 1 6g AFTER COATING or AFTER PLATING7.8.2Where the tolerance position G/g is insufficientrelieffortheapplicationtoholdthethreadswithinprod-uctlimits,thecoatingorplatingallowancemaybespeci-fied as the maximum and minimum limits of size forthreads before coating or plating. See section 8.EXAMPLE: Allowance on external thread M profile based on0.010 mm min. coating thicknessM6 ? 1 4h6h AFTER COATINGBEFORE COATINGMAJOR DIA 5.800 5.970PD 5.239 5.290MINOR DIA 4.887 MAX.7.9 Designation of Threads With Adjusted SizeLimitsIf a standard thread requires adjustment of size limitsof thread elements, so that standard allowances or toler-ancesdonotapply,designationshallincludetheindivid-ual element sizes; each special size shall be identifiedas “SPL.”EXAMPLE: External thread with allowance of 0.100 andpitch/major diameter tolerance grade of 4METRIC SCREW THREADS: M PROFILEASME B1.13M-2005M24 ? 3 SPL EXT (22)MAJOR DIA 23.664 23.900 SPLPD 21.826 21.951 SPLMINOR DIA 20.652 MAX. SPLEXAMPLE: Internal thread with no allowance but with toleranceclass 4G limits at minimum material.M24 ? 3 SPL INT (22)MINOR DIA 20.752 21.115 SPLPD 22.051 22.269 SPLMAJOR DIA 24.000 MIN.8DIMENSIONAL ACCOMMODATION OF COATINGOR PLATING FOR 60 deg THREADS8.1 IntroductionIt is not within the scope of this Standard to makerecommendations for thickness of, or to specify limitsfor coatings. However, it will aid mechanical inter-changeabilityifcertainprinciplesarefollowedwhereverconditions permit.The following guides shouldbe help-ful in determining the amount and direction of the alter-ations to establish applicable limits of size beforecoating. Some commonly used and firmly establishedprocesses for heavy coatings, such as hot-dip galvaniz-ing, do notfall within the scope of thesection. AppendixE contains information on internal threads of toleranceclass 6AX, which follow USA practice of overtappingto accommodate as-coated hot-dip galvanized externalthreads. Appendix F contains information on internalthread tolerance position E, which may be used whereG does not provide sufficient allowance, but where AXwould be excessive.NOTE: The term coating refers to one or more applications ofadditive material to the threads, but not limited to, electroplateddeposits, anodized deposits, dry film lubricants, dip-spin appliedmaterials, and mechanically applied platings. It does not includesoft or liquid lubricants that are readily displaced in assembly andgaging. Plating is therefore included as coating in the text.8.2 Material Limits for Coated ThreadsUnless otherwise specified, size limits for standardexternalthreadtoleranceclasses6gand4g6gapplypriorto coating. The external thread allowance may thus beused to accommodate the coating thickness on coatedparts, provided that the maximum coating thickness isnot more than14of the allowance. Thus, a 6g threadafter coating is subject to acceptance using a basic size6h GO thread gage and a 4g6g thread, a 4h6h or 6h GOthread gage. (Basic thread sizes, tolerance position h, aretabulated in Appendix D and size limits for 6h threadsare included in Table 14.) Minimum material, LO orNOT-GO gages would be 6g and 4g6g, respectively.Where external thread has no allowance or allowancemustbemaintainedaftercoating,andforstandardinter-nal threads, sufficient allowance must be provided priorto coating to ensure that finished product threads donot exceed the maximum material limits specified. For21thread classes with tolerance position H or h, coatingallowances in accordance with Table 13 for positions Gor g respectively, should be applied whenever possible.See paras. 8.4, 8.5, and Dimensional Effects of Coating(a) On a cylindrical surface, the effect of coating is tochange the diameter by twice the coating thickness one coating thickness on each side of the cylinder. Ona screw thread, this would apply to the major and minordiameters.(b) Becausethecoatingthicknessismeasuredperpen-dicular to the coated surface, while the pitch diameteris measured perpendicular to the thread axis, the effectof a uniformly coated thread flank on the pitch diameteris a change 4 times the thickness of coating on the flank.(see Fig. 6). The diameters of external threads beforecoating will be smaller while the diameters of internalthreads before coating will be larger than the coateddiameters.(c) Mostcoatingsandplatingsdonotapplyuniformlyon threads (see para. 8.7 and Fig. 7). Different coatingmaterials and processes have different application char-acteristics. The threaded parts overall length and otherconfiguration characteristicsalso affect theway coatingsbuild up on the threads. Paragraphs 8.4, 8.5, and 8.6provide general guidelines for calculating precoatingthread size to allow for coating build-up while pre-venting interference in assembly. The exact precoatingthread size for a given part with a given type of coatingwill frequently have to be developed by the producerexperimentally.8.4 External Thread With Allowance Available forCoating8.4.1 Maximum and Minimum Coating ThicknessSpecified.The amount of the allowance on the pitchdiameter is sufficient if 4 times the maximum coatingthickness is equal to or less than the allowance tabulatedin Table 13 or 14 or, if not in these tables, calculated performula in para. .2 Only Nominal or Minimum Coating ThicknessSpecified.If no coating thickness tolerance is given, itis recommended that a tolerance of plus 50% of thenominal or minimum thickness be assumed. Then, theamount of the allowance on the pitch diameter is suffi-cient if 6 times the specified coating thickness is equalto or less than the allowance tabulated in Table 13 or14 or, if not in these tables, calculated per formula inpara. 6.3.ASME B1.13M-2005METRIC SCREW THREADS: M PROFILEPitch diameter of screw after coatingPitch diameter of screw before coatingThread axis0.5 P(ref.)0.5 P(ref.)Enlarged View0.5atta0.25a = t and a = 4t or the pitch diameter of a 60 deg thread changes by four times the thickness of coating=thickness of coatingpitch diameter change due to coatingSine 30 deg (in small triangle above) = = 0.5t0.5a30 degFig. 6Ratio of Pitch Diameter Change to Thickness of Coating on 60 deg Threads22METRIC SCREW THREADS: M PROFILEASME B1.13M-2005The effects of electroplating on the functional diameterEnlarged ViewGENERAL NOTE: Electrodeposited coating builds up more heavily at sharp corners, is greater at the the extreme ends andedges of a length, and is least in the center and recessed areas.Fig. 7Effects of Electrodeposited Coating on 60 deg External Threads8.5 External Thread With No Allowance for Coating8.5.1 Maximum and Minimum Coating ThicknessSpecified.To determine before coating product limits,decrease(a) maximum pitch diameter by 4 times maximumcoating thickness(b) minimum pitch diameter by 4 times minimumcoating thickness(c) maximum major diameter by 2 times maximumcoating thickness(d) minimum major diameter by 2 times minimumcoating thickness(e) maximum minor diameter by 2 times maximumcoating thicknessEXAMPLE:M10 ? 1.5 6g After CoatingCoating Thickness 0.005 0.008To determine the before coating maximum materialsizes, decrease the maximum pitch diameter of 8.994 by0.032 (4 ? 0.008) to 8.962, the maximum major diameterof 9.968 by 0.016 (2 ? 0.008) to 9.952, and the maximumminor diameter of 8.344 by 0.016 (2 ? 0.008) to 8.328.Forthebeforecoatingminimumsizes,decreasethemini-mum pitch diameter of 8.862 by 0.020 (4 ? 0.005) to8.842 andthe minimum majordiameter of 9.732by 0.010(2 ? 0.005) to 9.722. The before coating sizes should beincluded in the thread designation. (See para. 7.8.2.)8.5.2 Only Nominal or Minimum Coating ThicknessSpecified.If no coating thickness tolerance is given, it23is recommended that a tolerance of plus 50% of thenominal or minimum thickness be assumed. Then, todetermine before coating product limits, decrease(a) maximum pitch diameter by 6 times coatingthickness(b) minimum pitch diameter by 4 times coatingthickness(c) maximum major diameter by 3 times coatingthickness(d) minimum major diameter by 2 times coatingthickness(e) maximum minor diameter by 3 times coatingthicknessEXAMPLE:M14 ? 2 4h6h Coating Thickness 0.008Since allowance for tolerance position g is 0.038, themaximum thickness of coating that may be applied isequalto0.038dividedby6or0.0063.Thisisnotsufficientfor the required coating of 0.008 so additional adjust-ments must be made.To determine the before coating maximum materialsizes, decrease the maximum pitch diameter of 12.701by0.048(6?0.008)to 12.653,themaximummajordiam-eter of 14.000 by 0.024 (3 ? 0.008) to 13.976, and themaximum minor diameter of 11.835 by 0.024 (3 ? 0.008)to 11.811. For the before coating minimum sizes,decrease the minimum pitch diameter of 12.601 by 0.032(4 ? 0.008) to 12.569 and the minimum major diameterASME B1.13M-2005METRIC SCREW THREADS: M PROFILEof 13.720 by 0.016 (2 ? 0.008) to 13.704. The before coat-ing sizes should be included in the thread designation.(See para. 7.8.2.)8.5.3 Adjusted Size Limits.It should be noted in theabove examples that the before coating material limittolerances are less than the tolerances after coating. Thisis because the coating tolerance consumes some of theproduct tolerance. In some instances there may be insuf-ficient pitch diameter tolerance available in the beforecoating condition so that additional adjustments andcontrols will be necessary.8.5.4 Strength.On small thread sizes (5 mm andsmaller) there is a possibility that coating thicknessadjustments will cause base material minimum materialconditions that may significantly affect the strength ofexternally threaded parts. Limitations on coating thick-ness or part redesign may be necessary.8.6 Internal Threads8.6.1 Maximum and Minimum Coating ThicknessSpecified.Standard internal threads provide no allow-ance for coating thickness. Use the allowance providedby tolerance position G (see Table 13) if 4 times themaximum coating thickness specified is equal or lessthan this allowance. Otherwise, to determine beforecoating product limits, increase(a) minimum pitch diameter by 4 times maximumcoating thickness(b) maximum pitch diameter by 4 times minimumcoating thickness(c) minimum minor diameter by 2 times maximumcoating thickness(d) maximum minor diameter by 2 times minimumcoating thickness(e) minimum major diameter by 2 times maximumcoating thicknessEXAMPLE:M12 ? 1.75 6H Coating Thickness 0.006 0.010Allowance provided by tolerance position G is 0.034.But 4 times the maximum coating thickness, the maxi-mum diametral increase, is 0.040 (4 ? 0.010). This islarger than the allowance provided by toleranceposition G so additional adjustments must be made tothe thread limits.To determine the before coating minimum productsizes, increase the minimum pitch diameter of 10.863by0.040(4 ?0.010)to10.903,theminimum minordiam-eter of 10.106 by 0.020 (2 ? 0.010) to 10.126, and theminimum major diameter of 12.000 by 0.020 (2 ? 0.010)to12.020.Forthebeforecoatingmaximumsizes,increasethe maximum pitch diameter of 11.063 by 0.024 (4 ?0.006) to 11.087 and the maximum minor diameter of10.441 by 0.012 (2 ? 0.006) to 10.453. The before coatingsizes should be included in the thread designation. (Seepara. 7.8.2.)248.6.2 Only Nominal or Minimum Coating ThicknessSpecified.If no thickness tolerance is given, it is recom-mended that a tolerance of plus 50% of the nominal orminimumthicknessbeassumed.Sincestandardinternalthreads provide no allowance for coating thickness, usethe allowance provided by tolerance position G (seeTable 13) if 6 times the nominal or minimum coatingthickness specified is equal or less than this allowance.Otherwise, to determine before coating product limits,increase(a) minimum pitch diameter by 6 times the minimumor nominal coating thickness(b) maximumpitchdiameterby4timestheminimumor nominal coating thickness(c) minimum minor diameter by 3 times the mini-mum or nominal coating thickness(d) maximum minor diameter by 2 times the mini-mum or nominal coating thickness(e) minimummajordiameterby3timestheminimumor nominal coating thicknessEXAMPLE:M20 ? 2.5 6H Coating Thickness 0.010Allowance provided by tolerance position G is 0.042.But 6 times the minimum or nominal coating thickness,the maximum diametral increase, is 0.060 (6 ? 0.010).This is larger than the allowance provided by toleranceposition G so additional adjustments must be made tothe thread limits.To determine the before coating minimum productsizes, increase the minimum pitch diameter of 18.376by0.060(6 ?0.010)to18.436,theminimum minordiam-eter of 17.294 by 0.030 (3 ? 0.010) to 17.324, and theminimum major diameter of 20.000 by 0.030 (3 ? 0.010)to20.030.Forthebeforecoatingmaximumsizes,increasethe maximum pitch diameter of 18.600 by 0.040 (4 ?0.010) to 18.640 and the maximum minor diameter of17.744 by 0.020 (2 ? 0.010) to 17.764. The before coatingsizes should be included in the thread designation. (Seepara. 7.8.2.)8.6.3 Adjusted Size Limits.It should be noted in theabove examples that the before coating material limittolerances are less than the tolerances after coating. Thisis because the coating tolerance consumes some of theproduct tolerance. In some instances there may be insuf-ficient pitch diameter tolerance available in the beforecoating condition so that additional adjustments andcontrols will be necessary.8.6.4 Strength.There is a possibility that coatingthickness adjustments will cause base material mini-mum material conditions that may seriously affectstrength of threaded parts. Limitations on coating thick-ness or part redesign may be necessary.8.7 Electrodeposited CoatingsElectroplatedcoatingsdonotcoverthreadsuniformly.Deposits build up more on thread crests than on threadMETRIC SCREW THREADS: M PROFILEASME B1.13M-2005flanks and coating thickness is greater on the lead endof a thread than on threads in the center of a part. Theguidelines for calculating precoating thread sizes foruniformly coated threads can be used as a starting placein determining the precoating thread sizes on a givenpart, but the exact sizes for any given part may have tobe determined by trial and error experimentation. Oneof the effects of electrodeposited coatings not applyinguniformly is that the functional diameter of an externalthread will generally increase by a greater magnitudethan the increase of the pitch diameter on a given part.Depending on an externally threaded parts configura-tion, an electrodeposited coating of 0.0025 mm on athread flank will probably result in a growth of the pitchdiameter of approximately 0.0100 mm or more, but thefunctional diameter may change by as much as0.0150 mm or more. In the case of internally threadedparts,electrodepositedcoatingscausethepitchdiameterand functional diameter to decrease in size, with thepitch diameter decreasing less than the functional diam-eter on a given part.Another effect of the nonuniform build-up of elec-trodeposited coatings is that the coating thickness onthe lead end of a thread is commonly greater than thethickness on the threads in the center of the part. Thisresults inthe pitchdiameter andthe functionaldiameterof a thread to be considerably larger on the end of thepart than their comparable measurements away fromthe end. The longer the part, in the case of externalthreads, or the thicker the part, in the case of internalthreads, the greater these differences tend to be. Thepartproducerandtheplatercannotcontrolthisphenom-enon. It is the nature of electrodeposited coatings onthreaded parts. It is conceivable that a parts dimensionscan measure within limits on the lead threads and bebeyond their limits on the threads away from the leadthreads.8.8 Other ConsiderationsIt is essential to adequately review all possibilitiesand consider limitations in the threading and coatingproduction processes before finalizing the coating pro-cess and the allowance required to accommodate thecoating. A no-allowance thread after coating shall nottransgress the basic profile and is, therefore, subject toacceptance using a basic (tolerance position H/h) sizeGOthreadgage.BasicsizesforISOseriesthreadsappearin Appendix D.9LIMITS OF SIZE9.1 Standard Thread Series(a) The limiting M profile for internal threads isshown in Fig. 8 with the associated dimensions inTable 15.25(b) The limiting M profiles for external threads areshown in Fig. 9 with the associated dimensions listedin Table 14.(c) For information, basic dimensions of all ISO seriesmetric screw threads, including the standard series,appear in Appendix D.9.2 Determination of Size Limits(a) Values listed in Tables 14 and 15 shall be used todetermine limits of size.(b) If required values are not listed in Tables 14 and15, they shall be calculated using ISO data in Tables 7,9, 10, 11, 12, and 13 and formulas in para. 9.3.(c) If required data is not included in any of the tableslisted above, calculate the missing data from formulasgiven in section 6 and in para. 9.3. Round in accordancewith ASME B1.30, which includes rounding rules andexamples.(d) Examples in paras. 9.4.1 and 9.4.2, demonstratethe use of tabulated values of allowances and tolerancesfor calculating size limits for standard ISO 261 sizes (seeTable 6). Examples in paras. 9.4.3 and 9.4.4, demonstratethe use of formulas for calculating values of allowancesand tolerances for determining size limits for nonstan-dard thread sizes.NOTE: If any tabulated values for allowance and tolerance areavailable,donotuseformulasforcalculationofthesevalues.Calcu-late from formulas only when tabulated values do not exist.9.3 Formulas for Calculating Limiting Dimensions forM Profile Screw Threads9.3.1 Internal Thread(a) Minimum majordiameter p basicmajor diameter+ EI (Table 13)(b) Minimum pitch diameter p basic major diameter 0.6495191P (Table 2) + EI for D2(Table 13)(c) Maximum pitch diameter p minimum pitchdiameter + TD2(Table 12)(d) Maximum major diameter p maximum pitchdiameter + 0.7938566P (Table 2)(e) Minimum minor diameter p minimum majordiameter 1.0825318P (Table 2)(f) Maximum minor diameter p minimum minordiameter + TD1(Table 9)9.3.2 External Thread(a) Maximummajordiameterpbasicmajordiameter es (Table 13)NOTE: es is absolute value.(b) Minimum major diameter p maximum majordiameter Td (Table 10)(c) Maximum pitch diameter p basic major diam. 0.6495191P (Table 2) es for d2(Table 13)(d) Minimum pitch diameter p maximum pitchdiameter Td2(Table 11)ASME B1.13M-2005METRIC SCREW THREADS: M PROFILETable 14External Thread Limiting Dimensions M ProfileMin. MinorDiameterMajor Diameter,Pitch Diameter, d2andMax. Minor(RoundeddFunctional DiameterAllowance,Diameter,Form), d3Note (2)Notes (2) and (3)Basic ThreadTolerancees(Flat Form), d1Note (4)DesignationClassNote (1)Max.Min.Max.Min.Tol.Note (2)(For Reference)M1.6 ? 0.356g0.0191.5811.4961.3541.2910.0631.2021.075M1.6 ? 0.356h0.0001.6001.5151.3731.3100.0631.2211.094M1.6 ? 0.354g6g0.0191.5811.4961.3541.3140.0401.2021.098M2 ? 0.46g0.0191.9811.8861.7211.6540.0671.5481.408M2 ? 0.46h0.0002.0001.9051.7401.6730.0671.5671.427M2 ? 0.44g6g0.0191.9811.8861.7211.6790.0421.5481.433M2.5 ? 0.456g0.0202.4802.3802.1882.1170.0711.9931.840M2.5 ? 0.456h0.0002.5002.4002.2082.1370.0712.0131.860M2.5 ? 0.454g6g0.0202.4802.3802.1882.1430.0451.9931.866M3 ? 0.56g0.0202.9802.8742.6552.5800.0752.4382.272M3 ? 0.56h0.0003.0002.8942.6752.6000.0752.4582.292M3 ? 0.54g6g0.0202.9802.8742.6552.6070.0482.4382.299M3.5 ? 0.66g0.0213.4793.3543.0893.0040.0852.8292.634M3.5 ? 0.66h0.0003.5003.3753.1103.0250.0852.8502.655M3.5 ? 0.64g6g0.0213.4793.3543.0893.0360.0532.8292.666M4 ? 0.76g0.0223.9783.8383.5233.4330.0903.2203.002M4 ? 0.76h0.0004.0003.8603.5453.4550.0903.2423.024M4 ? 0.74g6g0.0223.9783.8383.5233.4670.0563.2203.036M5 ? 0.86g0.0244.9764.8264.4564.3610.0954.1103.868M5 ? 0.86h0.0005.0004.8504.4804.3850.0954.1343.892M5 ? 0.84g6g0.0244.9764.8264.4564.3960.0604.1103.903M6 ? 16g0.0265.9745.7945.3245.2120.1124.8914.596M6 ? 16h0.0006.0005.8205.3505.2380.1124.9174.622M6 ? 14g6g0.0265.9745.7945.3245.2530.0714.8914.637M8 ? 1.256g0.0287.9727.7607.1607.0420.1186.6196.272M8 ? 1.256h0.0008.0007.7887.1887.0700.1186.6476.300M8 ? 1.254g6g0.0287.9727.7607.1607.0850.0756.6196.315M8 ? 16g0.0267.9747.7947.3247.2120.1126.8916.596M8 ? 16h0.0008.0007.8207.3507.2380.1126.9176.622M8 ? 14g6g0.0267.9747.7947.3247.2530.0716.8916.63726METRIC SCREW THREADS: M PROFILEASME B1.13M-2005Table 14External Thread Limiting Dimensions M Profile (Contd)Min. MinorDiameterMajor Diameter,Pitch Diameter, d2andMax. Minor(RoundeddFunctional DiameterAllowance,Diameter,Form), d3Note (2)Notes (2) and (3)Basic ThreadTolerancees(Flat Form), d1Note (4)DesignationClassNote (1)Max.Min.Max.Min.Tol.Note (2)(For Reference)M10 ? 1.56g0.0329.9689.7328.9948.8620.1328.3447.938M10 ? 1.56h0.00010.0009.7649.0268.8940.1328.3767.970M10 ? 1.54g6g0.0329.9689.7328.9948.9090.0858.3447.985M10 ? 1.256g0.0289.9729.7609.1609.0420.1188.6198.272M10 ? 1.256h0.00010.0009.7889.1889.0700.1188.6478.300M10 ? 1.254g6g0.0289.9729.7609.1609.0850.0758.6198.315M10 ? 16g0.0269.9749.7949.3249.2120.1128.8918.596M10 ? 16h0.00010.0009.8209.3509.2380.1128.9178.622M10 ? 14g6g0.0269.9749.7949.3249.2530.0718.8918.637M10 ? 0.756g0.0229.9789.8389.4919.3910.1009.1668.929M10 ? 0.756h0.00010.0009.8609.5139.4130.1009.1888.951M10 ? 0.754g6g0.0229.9789.8389.4919.4280.0639.1668.966M12 ? 1.756g0.03411.96611.70110.82910.6790.15010.0719.601M12 ? 1.756h0.00012.00011.73510.86310.7130.15010.1059.635M12 ? 1.754g6g0.03411.96611.70110.82910.7340.09510.0719.656M12 ? 1.56g0.03211.96811.73210.99410.8540.14010.3449.930M12 ? 1.56h0.00012.00011.76411.02610.8860.14010.3769.962M12 ? 1.54g6g0.03211.96811.73210.99410.9040.09010.3449.980M12 ? 1.256g0.02811.97211.76011.16011.0280.13210.61910.258M12 ? 1.256h0.00012.00011.78811.18811.0560.13210.64710.286M12 ? 1.254g6g0.02811.97211.76011.16011.0750.08510.61910.305M12 ? 16g0.02611.97411.79411.32411.2060.11810.89110.590M12 ? 16h0.00012.00011.82011.35011.2320.11810.91710.616M12 ? 14g6g0.02611.97411.79411.32411.2490.07510.89110.633M14 ? 26g0.03813.96213.68212.66312.5030.16011.79711.271M14 ? 26h0.00014.00013.72012.70112.5410.16011.83511.309M14 ? 24g6g0.03813.96213.68212.66312.5630.10011.79711.331M14 ? 1.56g0.03213.96813.73212.99412.8540.14012.34411.930M14 ? 1.56h0.00014.00013.76413.02612.8860.14012.37611.962M14 ? 1.54g6g0.03213.96813.73212.99412.9040.09012.34411.980M15 ? 16g0.02614.97414.79414.32414.2060.11813.89113.590M15 ? 16h0.00015.00014.82014.35014.2320.11813.91713.616M15 ? 14g6g0.02614.97414.79414.32414.2490.07513.89113.63327ASME B1.13M-2005METRIC SCREW THREADS: M PROFILETable 14External Thread Limiting Dimensions M Profile (Contd)Min. MinorDiameterMajor Diameter,Pitch Diameter, d2andMax. Minor(RoundeddFunctional DiameterAllowance,Diameter,Form), d3Note (2)Notes (2) and (3)Basic ThreadTolerancees(Flat Form), d1Note (4)DesignationClassNote (1)Max.Min.Max.Min.Tol.Note (2)(For Reference)M16 ? 26g0.03815.96215.68214.66314.5030.16013.79713.271M16 ? 26h0.00016.00015.72014.70114.5410.16013.83513.309M16 ? 24g6g0.03815.96215.68214.66314.5630.10013.79713.331M16 ? 1.56g0.03215.96815.73214.99414.8540.14014.34413.930M16 ? 1.56h0.00016.00015.76415.02614.8860.14014.37613.962M16 ? 1.54g6g0.03215.96815.73214.99414.9040.09014.34413.980M17 ? 16g0.02616.97416.79416.32416.2060.11815.89115.590M17 ? 16h0.00017.00016.82016.35016.2320.11815.91715.616M17 ? 14g6g0.02616.97416.79416.32416.2490.07515.89115.633M18 ? 1.56g0.03217.96817.73216.99416.8540.14016.34415.930M18 ? 1.56h0.00018.00017.76417.02616.8860.14016.37615.962M18 ? 1.54g6g0.03217.96817.73216.99416.9040.09016.34415.980M20 ? 2.56g0.04219.95819.62318.33418.1640.17017.25116.624M20 ? 2.56h0.00020.00019.66518.37618.2060.17017.29316.666M20 ? 2.54g6g0.04219.95819.62318.33418.2280.10617.25116.688M20 ? 1.56g0.03219.96819.73218.99418.8540.14018.34417.930M20 ? 1.56h0.00020.00019.76419.02618.8860.14018.37617.962M20 ? 1.54g6g0.03219.96819.73218.99418.9040.09018.34417.980M20 ? 16g0.02619.97419.79419.32419.2060.11818.89118.590M20 ? 16h0.00020.00019.82019.35019.2320.11818.91718.616M20 ? 14g6g0.02619.97419.79419.32419.2490.07518.89118.633M22 ? 2.56g0.04221.95821.62320.33420.1640.17019.25118.624M22 ? 2.56h0.00022.00021.66520.37620.2060.17019.29318.666M22 ? 1.56g0.03221.96821.73220.99420.8540.14020.34419.930M22 ? 1.56h0.00022.00021.76421.02620.8860.14020.37619.962M22 ? 1.54g6g0.03221.96821.73220.99420.9040.09020.34419.980M24 ? 36g0.04823.95223.57722.00321.8030.20020.70419.955M24 ? 36h0.00024.00023.62522.05121.8510.20020.75220.003M24 ? 34g6g0.04823.95223.57722.00321.8780.12520.70420.030M24 ? 26g0.03823.96223.68222.66322.4930.17021.79721.261M24 ? 26h0.00024.00023.72022.70122.5310.17021.83521.299M24 ? 24g6g0.03823.96223.68222.66322.5570.10621.79721.32528METRIC SCREW THREADS: M PROFILEASME B1.13M-2005Table 14External Thread Limiting Dimensions M Profile (Contd)Min. MinorDiameterMajor Diameter,Pitch Diameter, d2andMax. Minor(RoundeddFunctional DiameterAllowance,DiameterForm), d3Note (2)Notes (2) and (3)Basic ThreadTolerancees(Flat Form), d1Note (4)DesignationClassNote (1)Max.Min.Max.Min.Tol.Note (2)(For Reference)M25 ? 1.56g0.03224.96824.73223.99423.8440.15023.34422.920M25 ? 1.56h0.00025.00024.76424.02623.8760.15023.37622.952M25 ? 1.54g6g0.03224.96824.73223.99423.8990.09523.34422.975M27 ? 36g0.04826.95226.57725.00324.8030.20023.70422.955M27 ? 36h0.00027.00026.62525.05124.8510.20023.75223.003M27 ? 26g0.03826.96226.68225.66325.4930.17024.79724.261M27 ? 26h0.00027.00026.72025.70125.5310.17024.83524.299M27 ? 24g6g0.03826.96226.68225.66325.5570.10624.79724.325M30 ? 3.56g0.05329.94729.52227.67427.4620.21226.15825.306M30 ? 3.56h0.00030.00029.57527.72727.5150.21226.21125.359M30 ? 3.54g6g0.05329.94729.52227.67427.5420.13226.15825.386M30 ? 26g0.03829.96229.68228.66328.4930.17027.79727.261M30 ? 26h0.00030.00029.72028.70128.5310.17027.83527.299M30 ? 24g6g0.03829.96229.68228.66328.5570.10627.79727.325M30 ? 1.56g0.03229.96829.73228.99428.8440.15028.34427.920M30 ? 1.56h0.00030.00029.76429.02628.8760.15028.37627.952M30 ? 1.54g6g0.03229.96829.73228.99428.8990.09528.34427.975M33 ? 26g0.03832.96232.68231.66331.4930.17030.79730.261M33 ? 26h0.00033.00032.72031.70131.5310.17030.83530.299M33 ? 24g6g0.03832.96232.68231.66331.5570.10630.79730.325M35 ? 1.56g0.03234.96834.73233.99433.8440.15033.34432.920M35 ? 1.56h0.00035.00034.76434.02633.8760.15033.37632.952M36 ? 46g0.06035.94035.46533.34233.1180.22431.61030.654M36 ? 46h0.00036.00035.52533.40233.1780.22431.67030.714M36 ? 44g6g0.06035.94035.46533.34233.2020.14031.61030.738M36 ? 26g0.03835.96235.68234.66334.4930.17033.79733.261M36 ? 26h0.00036.00035.72034.70134.5310.17033.83533.299M36 ? 24g6g0.03835.96235.68234.66334.5570.10633.79733.325M39 ? 26g0.03838.96238.68237.66337.4930.17036.79736.261M39 ? 26h0.00039.00038.72037.70137.5310.17036.83536.299M39 ? 24g6g0.03838.96238.68237.66337.5570.10636.79736.325M40 ? 1.56g0.03239.96839.73238.99438.8440.15038.34437.920M40 ? 1.56h0.00040.00039.76439.02638.8760.15038.37637.95229ASME B1.13M-2005METRIC SCREW THREADS: M PROFILETable 14External Thread Limiting Dimensions M Profile (Contd)Min. MinorDiameterMajor Diameter,Pitch Diameter, d2andMax. Minor(RoundeddFunctional DiameterAllowance,DiameterForm), d3Note (2)Notes (2) and (3)Basic ThreadTolerancees(Flat Form), d1Note (4)DesignationClassNote (1)Max.Min.Max.Min.Tol.Note (2)(For Reference)M40 ? 1.54g6g0.03239.96839.73238.99438.8990.09538.34437.975M42 ? 4.56g0.06341.93741.43739.01438.7780.23637.06536.006M42 ? 4.56h0.00042.00041.50039.07738.8410.23637.12836.069M42 ? 4.54g6g0.06341.93741.43739.01438.8640.15037.06536.092M42 ? 26g0.03841.96241.68240.66340.4930.17039.79739.261M42 ? 26h0.00042.00041.72040.70140.5310.17039.83539.299M42 ? 24g6g0.03841.96241.68240.66340.5570.10639.79739.325M45 ? 1.56g0.03244.96844.73243.99443.8440.15043.34442.920M45 ? 1.56h0.00045.00044.76444.02643.8760.15043.37642.952M45 ? 1.54g6g0.03244.96844.73243.99443.8990.09543.34442.975M48 ? 56g0.07147.92947.39944.68144.4310.25042.51641.351M48 ? 56h0.00048.00047.47044.75244.5020.25042.58741.422M48 ? 54g6g0.07147.92947.39944.68144.5210.16042.51641.441M48 ? 26g0.03847.96247.68246.66346.4830.18045.79745.251M48 ? 26h0.00048.00047.72046.70146.5210.18045.83545.289M48 ? 24g6g0.03847.96247.68246.66346.5510.11245.79745.319M50 ? 1.56g0.03249.96849.73248.99448.8340.16048.34447.910M50 ? 1.56h0.00050.00049.76449.02648.8660.16048.37647.942M50 ? 1.54g6g0.03249.96849.73248.99448.8940.10048.34447.970M55 ? 1.56g0.03254.96854.73253.99453.8340.16053.34452.910M55 ? 1.56h0.00055.00054.76454.02653.8660.16053.37652.942M55 ? 1.54g6g0.03254.96854.73253.99453.8940.10053.34452.970M56 ? 5.56g0.07555.92555.36552.35352.0880.26549.97148.700M56 ? 5.56h0.00056.00055.44052.42852.1630.26550.04648.775M56 ? 5.54g6g0.07555.92555.36552.35352.1830.17049.97148.795M56 ? 26g0.03855.96255.68254.66354.4830.18053.79753.251M56 ? 26h0.00056.00055.72054.70154.5210.18053.83553.289M56 ? 24g6g0.03855.96255.68254.66354.5510.11253.79753.319M60 ? 1.56g0.03259.96859.73258.99458.8340.16058.34457.910M60 ? 1.56h0.00060.00059.76459.02658.8660.16058.37657.942M60 ? 1.54g6g0.03259.96859.73258.99458.8940.10058.34457.97030METRIC SCREW THREADS: M PROFILEASME B1.13M-2005Table 14External Thread Limiting Dimensions M Profile (Contd)Min. MinorDiameterMajor Diameter,Pitch Diameter, d2andMax. Minor(RoundeddFunctional DiameterAllowance,DiameterForm), d3Note (2)Notes (2) and (3)Basic ThreadTolerancees(Flat Form), d1Note (4)DesignationClassNote (1)Max.Min.Max.Min.Tol.Note (2)(For Reference)M64 ? 66g0.08063.92063.32060.02359.7430.28057.42556.047M64 ? 66h0.00064.00063.40060.10359.8230.28057.50556.127M64 ? 64g6g0.08063.92063.32060.02359.8430.18057.42556.147M64 ? 26g0.03863.96263.68262.66362.4830.18061.79761.251M64 ? 26h0.00064.00063.72062.70162.5210.18061.83561.289M64 ? 24g6g0.03863.96263.68262.66362.5510.11261.79761.319M65 ? 1.56g0.03264.96864.73263.99463.8340.16063.34462.910M65 ? 1.56h0.00065.00064.76464.02663.8660.16063.37662.942M65 ? 1.54g6g0.03264.96864.73263.99463.8940.10063.34462.970M70 ? 1.56g0.03269.96869.73268.99468.8340.16068.34467.910M70 ? 1.56h0.00070.00069.76469.02668.8660.16068.37667.942M70 ? 1.54g6g0.03269.96869.73268.99468.8940.10068.34467.970M72 ? 66g0.08071.92071.32068.02367.7430.28065.42564.047M72 ? 66h0.00072.00071.40068.10367.8230.28065.50564.127M72 ? 64g6g0.08071.92071.32068.02367.8430.18065.42564.147M72 ? 26g0.03871.96271.68270.66370.4830.18069.79769.251M72 ? 26h0.00072.00071.72070.70170.5210.18069.83569.289M72 ? 24g6g0.03871.96271.68270.66370.5510.11269.79769.319M75 ? 1.56g0.03274.96874.73273.99473.8340.16073.34472.910M75 ? 1.56h0.00075.00074.76474.02673.8660.16073.37672.942M75 ? 1.54g6g0.03274.96874.73273.99473.8940.10073.34472.970M80 ? 66g0.08079.92079.32076.02375.7430.28073.42572.047M80 ? 66h0.00080.00079.40076.10375.8230.28073.50572.127M80 ? 64g6g0.08079.92079.32076.02375.8430.18073.42572.147M80 ? 26g0.03879.96279.68278.66378.4830.18077.79777.251M80 ? 26h0.00080.00079.72078.70178.5210.18077.83577.289M80 ? 24g6g0.03879.96279.68278.66378.5510.11277.79777.319M80 ? 1.56g0.03279.96879.73278.99478.8340.16078.34477.910M80 ? 1.56h0.00080.00079.76479.02678.8660.16078.37677.942M80 ? 1.54g6g0.03279.96879.73278.99478.8940.10078.34477.970M85 ? 26g0.03884.96284.68283.66383.4830.18082.79782.251M85 ? 26h0.00085.00084.72083.70183.5210.18082.83582.28931ASME B1.13M-2005METRIC SCREW THREADS: M PROFILETable 14External Thread Limiting Dimensions M Profile (Contd)Min. MinorDiameterMajor Diameter,Pitch Diameter, d2andMax. Minor(RoundeddFunctional DiameterAllowance,DiameterForm), d3Note (2)Notes (2) and (3)Basic ThreadTolerancees(Flat Form), d1Note (4)DesignationClassNote (1)Max.Min.Max.Min.Tol.Note (2)(For Reference)M85 ? 24g6g0.03884.96284.68283.66383.5510.11282.79782.319M90 ? 66g0.08089.92089.32086.02385.7430.28083.42582.047M90 ? 66h0.00090.00089.40086.10385.8230.28083.50582.127M90 ? 64g6g0.08089.92089.32086.02385.8430.18083.42582.147M90 ? 26g0.03889.96289.68288.66388.4830.18087.79787.251M90 ? 26h0.00090.00089.72088.70188.5210.18087.83587.289M90 ? 24g6g0.03889.96289.68288.66388.5510.11287.79787.319M95 ? 26g0.03894.96294.68293.66393.4730.19092.79792.241M95 ? 26h0.00095.00094.72093.70193.5110.19092.83592.279M95 ? 24g6g0.03894.96294.68293.66393.5450.11892.79792.313M100 ? 66g0.08099.92099.32096.02395.7230.30093.42592.027M100 ? 66h0.000100.00099.40096.10395.8030.30093.50592.107M100 ? 64g6g0.08099.92099.32096.02395.8330.19093.42592.137M100 ? 26g0.03899.96299.68298.66398.4730.19097.79797.241M100 ? 26h0.000100.00099.72098.70198.5110.19097.83597.279M100 ? 24g6g0.03899.96299.68298.66398.5450.11897.79797.313M105 ? 26g0.038104.962104.682103.663103.4730.190102.797102.241M105 ? 26h0.000105.000104.720103.701103.5110.190102.835102.279M105 ? 24g6g0.038104.962104.682103.663103.5450.118102.797102.313M110 ? 26g0.038109.962109.682108.663108.4730.190107.797107.241M110 ? 26h0.000110.000109.720108.701108.5110.190107.835107.279M110 ? 24g6g0.038109.962109.682108.663108.5450.118107.797107.313M120 ? 26g0.038119.962119.682118.663118.4730.190117.797117.241M120 ? 26h0.000120.000119.720118.701118.5110.190117.835117.279M120 ? 24g6g0.038119.962119.682118.663118.5450.118117.797117.313M130 ? 26g0.038129.962129.682128.663128.4730.190127.797127.241M130 ? 26h0.000130.000129.720128.701128.5110.190127.835127.279M130 ? 24g6g0.038129.962129.682128.663128.5450.118127.797127.313M140 ? 26g0.038139.962139.682138.663138.4730.190137.797137.241M140 ? 26h0.000140.000139.720138.701138.5110.190137.835137.279M140 ? 24g6g0.038139.962139.682138.663138.5450.118137.797137.31332METRIC SCREW THREADS: M PROFILEASME B1.13M-2005Table 14External Thread Limiting Dimensions M Profile (Contd)Min. MinorDiameterMajor Diameter,Pitch Diameter, d2andMax Minor(RoundeddFunctional DiameterAllowance,DiameterForm), d3Note (2)Notes (2) and (3)Basic ThreadTolerancees(Flat Form) d1Note (4)DesignationClassNote (1)Max.Min.Max.Min.Tol.Note (2)(For Reference)M150 ? 26g0.038149.962149.682148.663148.4730.190147.797147.241M150 ? 26h0.000150.000149.720148.701148.5110.190147.835147.279M150 ? 24g6g0.038149.962149.682148.663148.5450.118147.797147.313M160 ? 36g0.048159.952159.577158.003157.7790.224156.704155.931M160 ? 36h0.000160.000159.625158.051157.8270.224156.752155.979M160 ? 34g6g0.048159.952159.577158.003157.8630.140156.704156.015M170 ? 36g0.048169.952169.577168.003167.7790.224166.704165.931M170 ? 36h0.000170.000169.625168.051167.8270.224166.752165.979M170 ? 34g6g0.048169.952169.577168.003167.8630.140166.704166.015M180 ? 36g0.048179.952179.577178.003177.7790.224176.704175.931M180 ? 36h0.000180.000179.625178.051177.8270.224176.752175.979M180 ? 34g6g0.048179.952179.577178.003177.8630.140176.704176.015M190 ? 36g0.048189.952189.577188.003187.7530.250186.704185.905M190 ? 36h0.000190.000189.625188.051187.8010.250186.752185.953M190 ? 34g6g0.048189.952189.577188.003187.8430.160186.704185.995M200 ? 36g0.048199.952199.577198.003197.7530.250196.704195.905M200 ? 36h0.000200.000199.625198.051197.8010.250196.752195.953M200 ? 34g6g0.048199.952199.577198.003197.8430.160196.704195.995GENERAL NOTE: All dimensions are in millimeters.NOTES:(1) es is absolute value.(2) For coated threads with tolerance classes 6g or 4g6g, see para. 8.2.(3) See para. 5.4(b).(4) Dimension used in the design of tools, etc. In dimensioning external threads it is not normally specified. Generally,minor diameter acceptance is based on maximum material condition gaging.33ASME B1.13M-2005METRIC SCREW THREADS: M PROFILED2 basic pitch diam.Basic profileD1 max. minor diam.0.5TD10.5TD2D1 basic minor diam.D2 max. pitch diam.D basic major diam.D max. major diam. Note (1)H/4H/8H/2H/24H/4GENERAL NOTE: Section-lined portions identify tolerance zone.NOTE:(1) Dimension is used in the design of tools, etc. In dimensioning internal threads it is not normally specified. Generallymajor diameter acceptance is based upon a maximum material condition gaging.Fig. 8Internal Thread Limiting M Profile, Tolerance Position H(e) Maximum flat form minor diameter p maximumpitch diameter 0.4330127P (Table 2)(f) Maximum rounded form minor diameter pmax. pitch diam. ?0.5H + 2r min.?1 cos?60 deg arc cos?1 Td24r min.?(for 0.125P min. root radius)(g) Minimum rounded form minor diameter p mini-mum pitch diameter 0.6160254P (Table 2)r min. p 0.125P (Table 3)9.4 Examples of Calculations of Size LimitsTables16Athrough16Dshowexamplesthatarebasedupon the practices for calculating and rounding screwthread dimensions as specified in ASME B1.30. Dimen-sions are expressed in millimeters.9.4.1 External Screw Thread, Standard Size.Theexample in Table 16A shows how tabulated values forallowances and tolerances (in accordance withISO 965-1) are used for the calculation of size limits inASME B1.13M tables for standard external thread sizes34listed in ISO 261. See para. 9.4.3 for an example with asize not listed in ISO 2 Internal Metric Screw Thread, Standard Size.The example in Table 16B shows how tabulated valuesfor allowances and tolerances (in accordance withISO 965-1) are used for the calculation of size limits inASME B1.13M tables for standard internal thread sizeslisted in ISO 261. See para. 9.4.4 for an example with asize not listed in ISO 2 Metric External Screw Thread, Non-StandardSize.The example in Table 16C shows how size limitcalculations are made by use of formulas for sizes notlisted in ISO 261. For an example of how tabulatedvaluesforallowancesandtolerances(inaccordancewithISO 965-1) are used for the calculation of size limits inASME B1.13M tables for standard external thread sizeslisted in ISO 261, see para. .4.4 Internal Metric Screw Thread, Non-StandardSize.The example in Table 16D shows how size limitcalculations are made by use of formulas for sizes notlisted in ISO 261. For an example of how tabulatedvaluesforallowancesandtolerances(inaccordancewithISO 965-1) are used for the calculation of size limits inMETRIC SCREW THREADS: M PROFILEASME B1.13M-2005Table 15Internal Thread Limiting Dimensions M ProfilePitch Diam., D2andMinor Diam., D1Functional Diam. Note (1)Major Diam., DBasic ThreadToleranceMax. Note (2)DesignationClassMin.Max.Min.Max.Tol.Min.(For Reference)M1.6 ? 0.356H1.2211.3211.3731.4580.0851.6001.736M2 ? 0.46H1.5671.6791.7401.8300.0902.0002.148M2.5 ? 0.456H2.0132.1382.2082.3030.0952.5002.660M3 ? 0.56H2.4592.5992.6752.7750.1003.0003.172M3.5 ? 0.66H2.8503.0103.1103.2220.1123.5003.698M4 ? 0.76H3.2423.4223.5453.6630.1184.0004.219M5 ? 0.86H4.1344.3344.4804.6050.1255.0005.240M6 ? 16H4.9175.1535.3505.5000.1506.0006.294M8 ? 1.256H6.6476.9127.1887.3480.1608.0008.340M8 ? 16H6.9177.1537.3507.5000.1508.0008.294M10 ? 1.56H8.3768.6769.0269.2060.18010.00010.397M10 ? 1.256H8.6478.9129.1889.3480.16010.00010.340M10 ? 16H8.9179.1539.3509.5000.15010.00010.294M10 ? 0.756H9.1889.3789.5139.6450.13210.00010.240M12 ? 1.756H10.10610.44110.86311.0630.20012.00012.452M12 ? 1.56H10.37610.67611.02611.2160.19012.00012.407M12 ? 1.256H10.64710.91211.18811.3680.18012.00012.360M12 ? 16H10.91711.15311.35011.5100.16012.00012.304M14 ? 26H11.83512.21012.70112.9130.21214.00014.501M14 ? 1.56H12.37612.67613.02613.2160.19014.00014.407M15 ? 16H13.91714.15314.35014.5100.16015.00015.304M16 ? 26H13.83514.21014.70114.9130.21216.00016.501M16 ? 1.56H14.37614.67615.02615.2160.19016.00016.407M17 ? 16H15.91716.15316.35016.5100.16017.00017.304M18 ? 1.56H16.37616.67617.02617.2160.19018.00018.407M20 ? 2.56H17.29417.74418.37618.6000.22420.00020.585M20 ? 1.56H18.37618.67619.02619.2160.19020.00020.407M20 ? 16H18.91719.15319.35019.5100.16020.00020.304M22 ? 2.56H19.29419.74420.37620.6000.22422.00022.585M22 ? 1.56H20.37620.67621.02621.2160.19022.00022.407M24 ? 36H20.75221.25222.05122.3160.26524.00024.698M24 ? 26H21.83522.21022.70122.9250.22424.00024.513M25 ? 1.56H23.37623.67624.02624.2260.20025.00025.417M27 ? 36H23.75224.25225.05125.3160.26527.00027.698M27 ? 26H24.83525.21025.70125.9250.22427.00027.513M30 ? 3.56H26.21126.77127.72728.0070.28030.00030.786M30 ? 26H27.83528.21028.70128.9250.22430.00030.513M30 ? 1.56H28.37628.67629.02629.2260.20030.00030.417M33 ? 26H30.83531.21031.70131.9250.22433.00033.513M35 ? 1.56H33.37633.67634.02634.2260.20035.00035.417M36 ? 46H31.67032.27033.40233.7020.30036.00036.877M36 ? 26H33.83534.21034.70134.9250.22436.00036.513M39 ? 26H36.83537.21037.70137.9250.22439.00039.513M40 ? 1.56H38.37638.67639.02639.2260.20040.00040.417M42 ? 4.56H37.12937.79939.07739.3920.31542.00042.96435ASME B1.13M-2005METRIC SCREW THREADS: M PROFILETable 15Internal Thread Limiting Dimensions M Profile (Contd)Pitch Diam., D2andMinor Diam., D1Functional Diam. Note (1)Major Diam., DBasic ThreadToleranceMax. Note (2)DesignationClassMin.Max.Min.Max.Tol.Min.(For Reference)M42 ? 26H39.83540.21040.70140.9250.22442.00042.513M45 ? 1.56H43.37643.67644.02644.2260.20045.00045.417M48 ? 56H42.58743.29744.75245.0870.33548.00049.056M48 ? 26H45.83546.21046.70146.9370.23648.00048.525M50 ? 1.56H48.37648.67649.02649.2380.21250.00050.429M55 ? 1.56H53.37653.67654.02654.2380.21255.00055.429M56 ? 5.56H50.04650.79652.42852.7830.35556.00057.149M56 ? 26H53.83554.21054.70154.9370.23656.00056.525M60 ? 1.56H58.37658.67659.02659.2380.21260.00060.429M64 ? 66H57.50558.30560.10360.4780.37564.00065.241M64 ? 26H61.83562.21062.70162.9370.23664.00064.525M65 ? 1.56H63.37663.67664.02664.2380.21265.00065.429M70 ? 1.56H68.37668.67669.02669.2380.21270.00070.429M72 ? 66H65.50566.30568.10368.4780.37572.00073.241M72 ? 26H69.83570.21070.70170.9370.23672.00072.525M75 ? 1.56H73.37673.67674.02674.2380.21275.00075.429M80 ? 66H73.50574.30576.10376.4780.37580.00081.241M80 ? 26H77.83578.21078.70178.9370.23680.00080.525M80 ? 1.56H78.37678.67679.02679.2380.21280.00080.429M85 ? 26H82.83583.21083.70183.9370.23685.00085.525M90 ? 66H83.50584.30586.10386.4780.37590.00091.241M90 ? 26H87.83588.21088.70188.9370.23690.00090.525M95 ? 26H92.83593.21093.70193.9510.25095.00095.539M100 ? 66H93.50594.30596.10396.5030.400100.000101.266M100 ? 26H97.83598.21098.70198.9510.250100.000100.539M105 ? 26H102.835103.210103.701103.9510.250105.000105.539M110 ? 26H107.835108.210108.701108.9510.250110.000110.539M120 ? 26H117.835118.210118.701118.9510.250120.000120.539M130 ? 26H127.835128.210128.701128.9510.250130.000130.539M140 ? 26H137.835138.210138.701138.9510.250140.000140.539M150 ? 26H147.835148.210148.701148.9510.250150.000150.539M160 ? 36H156.752157.252158.051158.3510.300160.000160.733M170 ? 36H166.752167.252168.051168.3510.300170.000170.733M180 ? 36H176.752177.252178.051178.3510.300180.000180.733M190 ? 36H186.752187.252188.051188.3860.335190.000190.768M200 ? 36H196.752197.252198.051198.3860.335200.000200.768GENERAL NOTE: All dimensions are in millimeters.NOTES:(1) See para. 5.4(b).(2) Dimension is used in the design of tools, etc. In dimensioning internal threads it is not normally specified. Generally,major diameter acceptance is based on maximum material condition gaging.36METRIC SCREW THREADS: M PROFILEASME B1.13M-2005d max. major diam. (shown with allowance)d min. major diam.d2 min. pitch diam.d2 max. pitch diam. (shown with allowance)d2 basic pitch diam.d basic major diam.0.5TdBasic profileSee Fig. 50.5Td20.5es0.5esH/4GENERAL NOTES:(a) Section-lined portions identify tolerance zone and unshaded portions identify allowance (fundamental deviation).(b) Tolerance position g is shown. For position h, allowance es is zero.Fig. 9External Thread Limiting M Thread ProfileASME B1.13M tables for standard internal thread sizeslisted in ISO 261, see para. 0LEAD AND FLANK ANGLE TOLERANCES10.1 Lead and Flank Angle AcceptanceAcceptance of lead and flank angles of product screwthreads shallbe in accordancewith paras.10.1.1 through10.1.6. These factors also contribute to visual identifica-tion of gross defects in thread profile.10.1.1When Thread Gaging System 21 ofASME B1.3 is specified, product thread lead (includinghelix) and flank angle variations are not considered.10.1.2When Thread Gaging System 22 ofASMEB1.3isspecified,withthepitchdiameterorthreadgroove diameter inspection required, the product threadlead (including helix) and flank angles shall be consid-ered acceptable when the minimum material character-istic (pitch diameter or thread groove diameter inTables 1 and 2, Cols. C and D of ASME B1.3) and the37maximum material characteristic (GO in Tables 1 and2, Col. A of ASME B1.3) are accepted by the gages speci-fied for System 22, over the standard GO thread gagelength.When Thread Gaging System 22 is specified withNOT-GO (LO) functional diameter combined with con-trol of lead and flank option, agreements must bereached between the purchaser and the supplier on leadand flank angle limits and method of evaluation.10.1.3When Thread Gaging System 23 of ASMEB1.3 is specified, product thread lead and flank anglesshall be acceptable if within the allowable variations asspecified in Tables 17 and 18. Also, the minimum mate-rialcharacteristic(pitchdiameterorthreadgroovediam-eter in Tables 1 and 2, Cols. C and D of ASME B1.3) andthe maximum material characteristic (GO in Tables 1and 2, Col. A of ASME B1.3) must be accepted by thegages specified for System 23, over the standard GOthread gage length.Allowablevariationsinleadandflankanglesaremax-imum values. Maximum variation in these and pitchASME B1.13M-2005METRIC SCREW THREADS: M PROFILEdiameter tolerance cannot be taken simultaneously. Seeparas. 10.1.5 and 0.1.4When individual inspections of lead (includ-ing helix) and flank angle variations are required, inaddition to Thread Gaging System 21 or 22 ofASME B1.3, the allowable variations for these character-istics shall be specified.10.1.5For sizes not included in Tables 17 and 18,the allowable lead variation is equal to 0.57735 timesone-half the pitch diameter tolerance. This is the leadvariation that causes a change in functional diameterequal to one-half the pitch diameter tolerance. Theallowable flank half-angle variation in minutes of arc isequal to 125 divided by the square root of pitch for pitch38diameter tolerance grade 6 and 80 divided by the squareroot of pitch for pitch diameter tolerance grade 4. Forother standard tolerance grades, multiply allowableangle variations for tolerance grade 6 by the multipliersin para. . Round calculated angle variations to thenearest 5 min.10.1.6For requirements of paras. 10.1.4 and 10.1.5,lead variation values tabulated or calculated are themaximum variations from specified lead between anytwo points not farther apart than the length of the stan-dard GO thread gage. (See ASME B47.1.) Flank anglevariation values are maximum variations from the basic30 deg angle between thread flanks and perpendicularsto the thread axis.METRIC SCREW THREADS: M PROFILEASME B1.13M-2005Table 16AExample of External Screw Thread, Standard SizeThread SizepM12 x 1.754g6gCharacteristic DescriptionExample of Size CalculationAdditional Information(1) Maximum external major diameter (dmax.)dmax. p dbsc ?es?;?es?is absolute value. . .p Basic major diameter (dbsc) allowance (es)dbsc p 12.000From thread size.?esg?p 0.034From Allowance in Table 13.dmax. p 12.000 0.034 p 11.966Final value is rounded to three decimalplaces so no further rounding is necessary.(2) Minimum external major diameter (dmin.)dmin. p dmax. Td. . .p Maximum external major diameter (dmax.) major diameterdmax. p 11.966See Table 16A, (1).tolerance (Td)Td p 0.265From Major Diameter Tolerance in Table 10.dmin. p 11.966 0.265 p 11.701Final value is rounded to three decimalplaces so no further rounding is necessary.(3) Maximum external pitch diameter (d2max.)d2max. p dmax. 0.6495191P. . .p Basic major diameter (dbsc) allowance (es) 0.6495191Pdmax. p 11.966See Table 16A, (1).or maximum external major diameter (dmax.) 0.6495191P0.6495191P p (0.6495191)(1.75). . .0.6495191P p 1.1366584This figure is rounded to five decimal placeswhich is two places beyond the three deci-mal place final value of d2max.0.6495191P p 1.13666This value may also be found in Thread Datain Table 2.d2max. p 11.966 1.13666. . .d2max. p 10.82934This figure is rounded to three decimal placesto obtain the final value of d2max.d2max. p 10.829, when rounded. . .(4) Minimum external pitch diameter (d2min.)d2min. p d2max. Td2. . .p Maximum external pitch diameter (d2max.) external pitchd2max. p 10.829See Table 16A, (3).diameter tolerance (Td2)Td2p 0.095From Pitch Diameter Tolerance in Table 11.d2min. p 10.829 0.095 p 10.734Final value is rounded to three decimalplaces so no further rounding is necessary.39ASME B1.13M-2005METRIC SCREW THREADS: M PROFILETable 16AExample of External Screw Thread, Standard Size (Contd)Thread SizepM12 x 1.754g6gCharacteristic DescriptionExample of Size CalculationAdditional Information(5) Maximum external minor diameter (d1max.) (flat form)d1max. p d2max. 0.4330127P. . .p Maximum external pitch diameter (d2max.) 0.4330127Pd2max. p 10.829See Table 16A, (3).0.4330127P p (0.4330127)(1.75). . .0.4330127P p 0.7577722This figure is rounded to five decimal placeswhich is two places beyond the three deci-mal place final value of d1max.0.4330127P p 0.75777This value may also be found in Thread Datain Table 2.d1max. p 10.829 0.75777. . .d1max. p 10.07123This figure is rounded to three decimal placesto obtain the final value of d1max.d1max. p 10.071, when rounded. . .(6) For Reference:d3min. p d2min. 0.6160254P. . .Minimum external minor diameter (d3min.) (round form)d2min. p 10.734See Table 16A, (4).p Minimum external pitch diameter (d2min.) 0.6160254P0.6160254P p (0.6160254)(1.75). . .0.6160254P p 1.0780445This figure is rounded to five decimal placeswhich is two places beyond the three deci-mal place final value of d3min.0.6160254P p 1.07804This value may also be found in Thread Datain Table 2.d3min. p 10.734 1.07804 p 9.65596This figure is rounded to three decimal placesto obtain the final value of d3min.d3min. p 9.656, when rounded. . .GENERAL NOTE: All dimensions are expressed in millimeters.40METRIC SCREW THREADS: M PROFILEASME B1.13M-2005Table 16BExample of Internal Metric Screw Thread, Standard SizeThread SizepM12 x 1.756HCharacteristic DescriptionExample of Size CalculationAdditional Information(1) Minimum internal major diameter (Dmin.)Dmin. p Dbsc + ?EI?; ?EI? is absolute value. . .p Basic internal major diameter (Dbsc) + allowance (EI)Dbsc p dbsc p 12.000From thread size.?EIH?p 0From Allowance in Table 13.Dmin. p 12.000 + 0.000 p 12.000Final value is rounded to three decimalplaces so no further rounding is necessary.(2) Minimum internal pitch diameter (D2min.)D2min. p Dmin. 0.6495191P. . .p Basic internal major diameterDmin. p 12.000See Table 16B, (1).(Dbsc) 0.6495191P + allowance (EI)0.6495191P p 0.6495191 (1.75). . .or minimum internal major diameter (Dmin.) 0.6495191P0.6495191P p 1.1366584This figure is rounded to five decimal placeswhich is two places beyond the three deci-mal place final value of D2min.0.6495191P p 1.13666This value may also be found in Thread Datain Table 2.D2min. p 12.000 1.13666. . .D2min. p 10.86334This figure is rounded to obtain the finalvalue of minimum pitch diameter.D2min. p 10.863, when rounded. . .(3) Maximum internal pitch diameter (D2max.)D2max. p D2min. + TD2. . .p Minimum internal pitch diameter (D2min.) + internal pitchD2min. p 10.863See Table 16B, (2).diameter tolerance (TD2)TD2(6) p 0.200From Pitch Diameter Tolerance in Table 12.D2max. p 10.863 + 0.200 p 11.063Final value is rounded to three decimalplaces so no further rounding is necessary.(4) Minimum internal minor diameter (D1min.)D1min. p Dmin. 1.0825318P. . .p Minimum internal major diameter (Dmin.) 1.0825318PDmin. p 12.000See Table 16B, (1).1.0825318P p (1.0825318)(1.75). . .1.0825318P p 1.8944306This figure is rounded to five decimal placeswhich is two places beyond the three deci-mal place final value D1min.1.0825318P p 1.89443This value may also be found in Thread Datain Table 2.D1min. p 12.000 1.89443. . .D1min. p 10.10557This figure is rounded to three decimal placesto obtain the final value of minimum pitchdiameter.D1min. p 10.106, when rounded. . .41ASME B1.13M-2005METRIC SCREW THREADS: M PROFILETable 16BExample of Internal Metric Screw Thread, Standard Size (Contd)Thread SizepM12 x 1.756HCharacteristic DescriptionExample of Size CalculationAdditional Information(5) Maximum internal minor diameter (D1max.)D1max. p D1min. + TD1. . .p Minimum internal minor diameter (D1min.) + internal minorD1min. p 10.106See Table 16B, (4).diameter tolerance (TD1)TD1(6) p 0.335From Minor Diameter Tolerance in Table 9.D1max. p 10.106 + 0.335 p 10.441Final value is rounded to three decimalplaces so no further rounding is necessary.(6) For Reference:Dmax. p D2max. + 0.7938566P. . .Maximum internal major diameter (Dmax.)D2max. p 11.063See Table 16B, (3).p Maximum internal pitch diameter (D2max.) + 0.7938566P0.7938566P p (0.7938566) 1.75. . .0.7938566P p 1.3892490This figure is rounded to five decimal placeswhich is two places beyond the three deci-mal place final value of Dmax.0.7938566P p 1.38925This value may also be found in Thread Datain Table 2.Dmax. p 11.063 + 1.38925. . .Dmax. p 12.45225This figure is rounded to three decimal placesto obtain the final value of maximum majordiameter.Dmax. p 12.452, when rounded. . .GENERAL NOTE: All dimensions are expressed in millimeters.42METRIC SCREW THREADS: M PROFILEASME B1.13M-2005Table 16CExample of External Metric Screw Thread, Non-Standard SizeThread SizepM13 x 0.94g6gCharacteristic DescriptionExample of Size CalculationAdditional Information(1) Maximum external major diameter (dmax.)dmax. p dbsc ?es?; ?es? is absolute value. . .p Basic major diameter (dbsc) allowance (es)dbsc p 13.000This is the final value of the basic majordiameter and is therefore expressed withthree decimal places.?esg?p 0.015 + 0.011Pes for tolerance position g is not tabulatedfor P p 0.9 so it must be calculated. . .?esg?p 0.015 + 0.011(0.9)This figure is rounded to three decimal places?esg?p 0.0249to obtain the final absolute value of allow-ance for tolerance position g. . .?esg?p 0.025, when roundedFinal value is rounded to three decimaldmax. p 13.000 0.025 p 12.975places so no further rounding is necessary.(2) Minimum external major diameter (dmin.)dmin. p dmax. Td. . .p Maximum external major diameter (dmax.) tolerance (Td)dmax. p 12.975See Table 16C, (1).Td (6) p 0.183?P20.00315?PTd for tolerance grade 6 is not tabulated forPp0.9 so it must be calculated. . .Td (6) p 0.183?0.920.00315?0.9Td (6) p 0.183?0.81000 0.003150.94868. . .Td (6) p 0.18 (0.93217) 0.003150.94868. . .Td (6) p 0.167790.00332. . .This figure is rounded to three decimal placesTd (6) p 0.16447to obtain the final value of major diametertolerance for tolerance grade 6. . .Td (6) p 0.164, when roundedFinal value is rounded to three decimaldmin. p 12.975 0.164 p 12.811places so no further rounding is necessary.(3) Maximum external pitch diameter (d2max.)d2max. p dmax. 0.6495191P. . .p Basic major diameter (dbsc) allowance (es) 06495191Pdmax. p 12.975See Table 16C, (1).or maximum external major diameter (dmax.) 06495191P0.6495191P p 0.6495191(0.9). . .0.6495191P p 0.5845672This figure is rounded to five decimal placesto obtain the final value.0.6495191P p 0.58457. . .d2max. p 12.975 0.58457. . .d2max. p 12.39043This figure is rounded to obtain the finalvalue of d2max.d2max. p 12.390, when rounded. . .43ASME B1.13M-2005METRIC SCREW THREADS: M PROFILETable 16CExample of External Metric Screw Thread, Non-Standard Size (Contd)Thread SizepM13 x 0.94g6gCharacteristic DescriptionExample of Size CalculationAdditional Information(4) Minimum external pitch diameter (d2min.)d2min. p d2max. Td2. . .p Maximum external pitch diameter (d2max.) external pitchd2max. p 12.390See Table 16C, (3).diameter tolerance (Td2)Td2(4) p 0.63Td2(6)Td2for tolerance grade 4 is not tabulated forPp0.9 so it must be calculated.Td2(4) p 0.63 0.09P0.4d0.1. . .Td2(4) p 0.63 0.09 (0.9)0.4(13)0.1. . .Td2(4) p 0.63 0.09 (0.95873) (1.29239). . .Td2(4) p 0.63 (0.09)(1.23905). . .Td2(4) p (0.63)(0.11151). . .Td2(4) p 0.07025This figure is rounded to three decimal placesto obtain the final value of pitch diametertolerance for tolerance grade 4.Td2(4) p 0.070, when rounded. . .d2min. p 12.390 0.070 p 12.320Final value is rounded to three decimalplaces so no further rounding is necessary.(5) Maximum external minor diameter (d1max.) (flat form)d1max. p d2max. 0.4330127P. . .p Maximum external pitch diameter (d2max.) 0.4330127Pd2max. p 12.390See Table 16C, (3).0.4330127P p 0.4330127 (0.9). . .0.4330127P p 0.3897114This figure is rounded to five decimal places,which is two decimal places beyond thethree decimal place value of d1max.0.4330127P p 0.38971. . .d1max. p 12.390 0.38971. . .d1max. p 12.00029This figure is rounded to three decimal placesto obtain the final value of maximum minordiameterd1max. p 12.000, when rounded. . .(6) For Reference:d3min. p d2min. 0.6160254P. . .Minimum external minor diameter (d3min.)(round form)d2min. p 12.320See Table 16C, (4).p Minimum external pitch diameter (d2min.) 0.6160254P0.6160254P p 0.6160254 (0.9). . .0.6160254P p 0.5544229This figure is rounded to five decimal places,which is two decimal places beyond thethree decimal place final value of d3min.0.6160254P p 0.55442. . . . .d3min. p 12.320 0.55442This figure is rounded to obtain the finald3min. p 11.76558value of minimum minor diameter. . .d3min. p 11.766, when roundedGENERAL NOTE: All dimensions are expressed in millimeters.44METRIC SCREW THREADS: M PROFILEASME B1.13M-2005Table 16DExample of Internal Metric Screw Thread, Non-Standard SizeThread SizepM13 x 0.96HCharacteristic DescriptionExample of Size CalculationAdditional Information(1) Minimum internal major diameter (Dmin.)Dmin. p Dbsc + ?EI?; ?EI? is absolute value. . .p Basic internal major diameter (Dbsc) + allowance (EI)Dbsc p dbsc p 13.000See Table 16C, (1)EIHp 0From Allowance for tolerance position H inTable 13.Dmin. p 13.000 + 0.000 p 13.000Final value is rounded to three decimal placesso no further rounding is necessary.(2) Minimum internal pitch diameter (D2min.)D2min. p Dmin. 0.6495191P. . .p Basic internal major diameter (Dmin.) 0.6495191PDmin. p 13.000See Table 16D, (1).+ allowance (EI); or minimum internal major diameter0.6495191P p 0.6495191 (0.9). . .(Dmin.) 0.6495191P0.6495191P p 0.5845672This figure is rounded to five decimal places,which is two places beyond the three decimalplace final value of D2min.0.6495191P p 0.58457. . .D2min. p 13.000 0.58457. . .D2min. p 12.41543This figure is rounded to obtain the final valueof minimum pitch diameter.D2min. p 12.415, when rounded. . .(3) Maximum internal pitch diameter (D2max.)D2max. p D2min. + TD2. . .p Minimum internal pitch diameter (D2min.) + internal pitchD2min. p 12.415See Table 16D, (2).diameter tolerance (TD2)TD2(6) p 1.32Td2(6)TD2(or Td2) for tolerance grade 6 is not tabu-lated for P p 0.9 so it must be calculated.TD2(6) p 1.32 0.09P0.4d0.1. . .TD2(6) p 1.32 0.09 (0.9)0.4(13)0.1. . .TD2(6) p 1.32 0.09 (0.95873)(1.29239). . .TD2(6) p 0.14720This figure is rounded to three decimal placesto obtain the final value of pitch diameter tol-erance for tolerance grade 6.TD2(6) p 0.147, when rounded. . .D2max. p 12.415 + 0.147 p 12.562Final value is rounded to three decimal placesso no further rounding is necessary.(4) Minimum internal minor diameter (D1min.)D1min. p Dmin. 1.0825318P. . .p Minimum internal major diameter (Dmin.) 1.0825318PDmin. p 13.000See Table 16D, (1).1.0825318P p 1.0825318 (0.9). . .1.0825318P p 0.9742786This figure is rounded to five decimal places,which is two places beyond the three decimalplace final value of D1min.1.0825318P p 0.97428. . .D1min. p 13.000 0.97428. . .D1min. p 12.02572This figure is rounded to three decimal placesto obtain the final value of minimum pitch di-ameterD1min. p 12.026, when rounded. . .45ASME B1.13M-2005METRIC SCREW THREADS: M PROFILETable 16DExample of Internal Metric Screw Thread, Non-Standard Size (Contd)Thread SizepM13 x 0.96HCharacteristic DescriptionExample of Size CalculationAdditional Information(5) Maximum internal minor diameter (D1max.)D1max. p D1min. + TD1. . .p Minimum internal minor diameter (D1min.) + tolerance (TD1)D1min. p 12.026See Table 16D, (4).TD1(6) p 0.218P p 0.9 is not tabulated nor is there any ISOformula applicable to this pitch. Therefore, atolerance midway between the tabulated val-ues for P p 0.8 and P p 1.0 has been se-lected. This value is TD1(6) p 0.218.D1max. p 12.026 + 0.218 p 12.244Final value is rounded to three decimal placesso no further rounding is necessary.(6) For Reference:Dmax. p D2max. + 0.7938566P. . .Maximum internal major diameter (Dmax.)D2max. p 12.562See Table 16D, (3).p Maximum internal pitch diameter (D2max.) + 0.7938566P0.7938566P p 0.7938566 (0.9). . .0.7938566P p 0.7144709This figure is rounded to five decimal places,which is two places beyond the three decimalplace value of Dmax.0.7938566P p 0.71447. . .Dmax. p 12.562 + 0.71447. . .Dmax. p 13.27647This figure is rounded to three decimal placesto obtain the final value of maximum majordiameter.Dmax. p 13.276, when rounded. . .GENERAL NOTE: All dimensions are expressed in millimeters.46METRIC SCREW THREADS: M PROFILEASME B1.13M-2005Table 17Allowable Variations in Lead and Equivalent Change in Functional Diameter(See paras. 10.1.3 through 10.1.6 for applicability.)External ThreadsInternal ThreadsEquivalentEquivalentAllowableChange inAllowableChange inVariationFunctionalVariationFunctionalBasic ThreadTolerancein LeadDiameterTolerancein LeadDiameterDesignationClass()(+)Class()()M1.6 ? 0.356g0.0180.0326H0.0250.0424g6g0.0120.020. . . . . . .M2 ? 0.46g0.0190.0346H0.0260.0454g6g0.0120.021. . . . . . .M2.5 ? 0.456g0.0200.0366H0.0270.0484g6g0.0130.022. . . . . . .M3 ? 0.56g0.0220.0386H0.0290.0504g6g0.0140.024. . . . . . .M3.5 ? 0.66g0.0250.0426H0.0320.0564g6g0.0150.026. . . . . . .M4 ? 0.76g0.0260.0456H0.0340.0594g6g0.0160.028. . . . . . .M5 ? 0.86g0.0270.0486H0.0360.0624g6g0.0170.030. . . . . . .M6 ? 16g0.0320.0566H0.0430.0754g6g0.0200.036. . . . . . .M8 ? 1.256g0.0340.0596H0.0460.0804g6g0.0220.038. . . . . . .M8 ? 16g0.0320.0566H0.0430.0754g6g0.0200.036. . . . . . .M10 ? 1.56g0.0380.0666H0.0520.0904g6g0.0250.042. . . . . . .M10 ? 1.256g0.0340.0596H0.0460.0804g6g0.0220.038. . . . . . .M10 ? 16g0.0320.0566H0.0430.0754g6g0.0200.036. . . . . . .M10 ? 0.756g0.0290.0506H0.0380.0664g6g0.0190.032. . . . . . .M12 ? 1.756g0.0430.0756H0.0580.1004g6g0.0270.048. . . . . . .M12 ? 1.56g0.0400.0706H0.0550.0954g6g0.0260.045. . . . . . .M12 ? 1.256g0.0380.0666H0.0520.0904g6g0.0250.042. . . . . . .M12 ? 16g0.0340.0596H0.0550.0804g6g0.0220.038. . . . . . .M14 ? 26g0.0460.0806H0.0610.1064g6g0.0290.050. . . . . . .M14 ? 1.56g0.0400.0706H0.0550.0954g6g0.0260.045. . . . . . .M15 ? 16g0.0340.0596H0.0550.0804g6g0.0220.038. . . . . . .M16 ? 26g0.0460.0806H0.0610.1064g6g0.0290.050. . . . . . .M16 ? 1.56g0.0400.0706H0.0550.0954g6g0.0260.045. . . . . . .M17 ? 16g0.0340.0596H0.0460.0804g6g0.0220.038. . . . . . .47ASME B1.13M-2005METRIC SCREW THREADS: M PROFILETable 17Allowable Variations in Lead and Equivalent Change in Functional Diameter (Contd)(See paras. 10.1.3 through 10.1.6 for applicability.)External ThreadsInternal ThreadsEquivalentEquivalentAllowableChange inAllowableChange inVariationFunctionalVariationFunctionalBasic ThreadTolerancein LeadDiameterTolerancein LeadDiameterDesignationClass()(+)Class()()M18 ? 1.56g0.0400.0706H0.0550.0954g6g0.0260.045. . . . . . .M20 ? 2.56g0.0490.0856H0.0650.1124g6g0.0310.053. . . . . . .M20 ? 1.56g0.0400.0706H0.0550.0954g6g0.0260.045. . . . . . .M20 ? 16g0.0340.0596H0.0460.0804g6g0.0220.038. . . . . . .M22 ? 2.56g0.0490.0856H0.0650.112M22 ? 1.56g0.0400.0706H0.0550.0954g6g0.0260.045. . . . . . .M24 ? 36g0.0580.1006H0.0760.1324g6g0.0360.062. . . . . . .M24 ? 26g0.0490.0856H0.0650.1124g6g0.0310.053. . . . . . .M25 ? 1.56g0.0430.0756H0.0580.1004g6g0.0250.042. . . . . . .M27 ? 36g0.0580.1006H0.0760.132M27 ? 26g0.0490.0856H0.0650.1124g6g0.0310.053. . . . . . .M30 ? 3.56g0.0610.1066H0.0810.1404g6g0.0380.066. . . . . . .M30 ? 26g0.0490.0856H0.0650.1124g6g0.0310.053. . . . . . .M30 ? 1.56g0.0430.0756H0.0580.1004g6g0.0250.042. . . . . . .M33 ? 26g0.0490.0856H0.0650.1124g6g0.0310.053. . . . . . .M35 ? 1.56g0.0430.0756H0.0580.100M36 ? 46g0.0650.1126H0.0870.1504g6g0.0400.070. . . . . . .M36 ? 26g0.0490.0856H0.0650.1124g6g0.0310.053. . . . . . .M39 ? 26g0.0490.0856H0.0650.1124g6g0.0310.053. . . . . . .M40 ? 1.56g0.0430.0756H0.0580.1004g6g0.0250.042. . . . . . .M42 ? 4.56g0.0680.1186H0.0910.1584g6g0.0430.075. . . . . . .M42 ? 26g0.0490.0856H0.0650.1124g6g0.0310.053. . . . . . .M45 ? 1.56g0.0430.0756H0.0580.1004g6g0.0250.042. . . . . . .M48 ? 56g0.0720.1256H0.0970.1684g6g0.0460.080. . . . . . .M48 ? 26g0.0520.0906H0.0680.1184g6g0.0320.056. . . . . . .M50 ? 1.56g0.0460.0806H0.0610.1064g6g0.0290.050. . . . . . .48METRIC SCREW THREADS: M PROFILEASME B1.13M-2005Table 17Allowable Variations in Lead and Equivalent Change in Functional Diameter (Contd)(See paras. 10.1.3 through 10.1.6 for applicability.)External ThreadsInternal ThreadsEquivalentEquivalentAllowableChange inAllowableChange inVariationFunctionalVariationFunctionalBasic ThreadTolerancein LeadDiameterTolerancein LeadDiameterDesignationClass()(+)Class()()M55 ? 1.56g0.0460.0806H0.0610.1064g6g0.0290.050. . . . . . .M56 ? 5.56g0.0760.1326H0.1020.1784g6g0.0490.085. . . . . . .M56 ? 26g0.0520.0906H0.0680.1184g6g0.0320.056. . . . . . .M60 ? 1.56g0.0460.0806H0.0610.1064g6g0.0290.050. . . . . . .M64 ? 66g0.0810.1406H0.1080.1884g6g0.0520.090. . . . . . .M64 ? 26g0.0520.0906H0.0680.1184g6g0.0320.056. . . . . . .M65 ? 1.56g0.0460.0806H0.0610.1064g6g0.0290.050. . . . . . .M70 ? 1.56g0.0460.0806H0.0610.1064g6g0.0290.050. . . . . . .M72 ? 66g0.0810.1406H0.1080.1884g6g0.0520.090. . . . . . .M72 ? 26g0.0520.0906H0.0680.1184g6g0.0320.056. . . . . . .M75 ? 1.56g0.0460.0806H0.0610.1064g6g0.0290.050. . . . . . .M80 ? 66g0.0810.1406H0.1080.1884g6g0.0520.090. . . . . . .M80 ? 26g0.0520.0906H0.0680.1184g6g0.0320.056. . . . . . .M80 ? 1.56g0.0460.0806H0.0610.1064g6g0.0290.050. . . . . . .M85 ? 26g0.0520.0906H0.0680.1184g6g0.0320.056. . . . . . .M90 ? 66g0.0810.1406H0.1080.1884g6g0.0520.090. . . . . . .M90 ? 26g0.0520.0906H0.0680.1184g6g0.0320.056. . . . . . .M95 ? 26g0.0550.0956H0.0720.1254g6g0.0340.059. . . . . . .M100 ? 66g0.0870.1506H0.1150.2004g6g0.0550.095. . . . . . .M100 ? 26g0.0550.0956H0.0720.1254g6g0.0340.059. . . . . . .M105 ? 26g0.0550.0956H0.0720.1254g6g0.0340.059. . . . . . .M110 ? 26g0.0550.0956H0.0720.1254g6g0.0340.059. . . . . . .M120 ? 26g0.0550.0956H0.0720.1254g6g0.0340.059. . . . . . .M130 ? 26g0.0550.0956H0.0720.1254g6g0.0340.059. . . . . . .49ASME B1.13M-2005METRIC SCREW THREADS: M PROFILETable 17Allowable Variations in Lead and Equivalent Change in Functional Diameter (Contd)(See paras. 10.1.3 through 10.1.6 for applicability.)External ThreadsInternal ThreadsEquivalentEquivalentAllowableChange inAllowableChange inVariationFunctionalVariationFunctionalBasic ThreadTolerancein LeadDiameterTolerancein LeadDiameterDesignationClass()(+)Class()()M140 ? 26g0.0550.0956H0.0720.1254g6g0.0340.059. . . . . . .M150 ? 26g0.0550.0956H0.0720.1254g6g0.0340.059. . . . . . .M160 ? 36g0.0650.1126H0.0870.1504g6g0.0400.070. . . . . . .M170 ? 36g0.0650.1126H0.0870.1504g6g0.0400.070. . . . . . .M180 ? 36g0.0650.1126H0.0870.1504g6g0.0400.070. . . . . . .M190 ? 36g0.0720.1256H0.0970.1684g6g0.0460.080. . . . . . .M200 ? 36g0.0720.1256H0.0970.1684g6g0.0460.080. . . . . . .GENERAL NOTE: All dimensions are in millimeters.Table 18Allowable Variations in 30 deg BasicHalf-Angle of Screw ThreadsExternal and Internal ThreadsAllowable Variation in Half-AnglePitch Diam. Tol.Pitch Diam. Tol.Grade 6Grade 4Pitch degMin. degMin.0.353302150.43202050.453052000.52551550.62401450.72301350.752251300.822013012051201.251501101.51401051.7513510021300552.512005031100453.510504541050404.510004050550355.505503560500358045030GENERAL NOTE: See paras. 10.1.3 through 10.1.6 for applicability.50ASME B1.13M-2005NONMANDATORY APPENDIX ASTANDARD RULES FOR ROUNDINGSee ASME B1.30 for rounding rules and examples.51ASME B1.13M-2005NONMANDATORY APPENDIX BTHREAD STRENGTH DESIGN FORMULASB-1THREAD TENSILE STRESS AREAThe following tensile stress area formula is used forthe purpose of product acceptance computations perISO 898-1. This formula is based upon the area at asection midway between the basic pitch diameter andthe basic rounded form minor diameter with radius of0.144P.Tensile stress Area, mm2As p 0.7854?dbsc 0.9382P?2B-2THREAD SHEAR AREAThefollowing formulasforthread shearareas aregeo-metric minimum values. Shear (Thread Stripping)strength of screw threads under load are dependent, inaddition, on mating component relative materialstrengths, nut geometry, and coefficient of frictionbetween thread bearing surfaces. Effective shear areasare therefore somewhat less than the geometric values.Thread Geometric Shear Areas:ASnp3.1416PLE d min.?P2+ 0.57735?d min. D2max.?ASsp3.1416PLE D1max.?P2+ 0.57735?d2min. D1max.?52whereASnp minimum thread shear area for internalthreads, mm2ASsp minimum thread shear area for externalthreads, mm2LE p length of engagementB-3LENGTH OF THREAD ENGAGEMENTIngeneralthelengthof engagementofmatingthreadsis selected to utilize full tensile strength of a bolt prior toshearing of nut threads. Other applications may requireinternal thread shear prior to failure of the externallythreaded part. For noncritical design, the following for-mulas are often used for approximation:Tensile strength of externally threaded part, kNpStAs1 000Shear strength of threads, kNp St?ASnor ASs?2 000whereStp Ultimate tensile strength of material, MPaAn internationally accepted study on the subject hasbeen published in the 1977 Transactions of the Society ofAutomotiveEngineersasPapernumber770420,Analysisand Design of Threaded Assemblies by E. M. Alexander.ASME B1.13M-2005NONMANDATORY APPENDIX CLIMITING DIMENSIONS M PROFILE SCREW THREADS INCH TRANSLATIONThis Appendix (see Tables C-1 and C-2) presents aninch translation of limiting dimensions for M profilescrew threads appearing in Tables 14 and 15. Dataappearing here are for reference only. Dimensions havebeen calculated by dividing millimeter values inTables 14 and 15, respectively, by 25.400 and roundingto 5 decimal places in accordance with ASME B1.30.53ASME B1.13M-2005NONMANDATORY APPENDIX CTable C-1Inch Translation for External Thread Limiting Dimensions M ProfileMajor Diameter,Pitch Diameter, d2andMax. MinorMin. Minor Diam.,dFunctional DiameterAllowance,Diameter(Rounded Form), d3NominalNote (2)Notes (2), (3), and (4)Basic ThreadTolerancees(Flat Form),Note (5)Pitch,DesignationClassNote (1)Max.Min.Max.Min.Tol.d1Note (2)(For Reference)PM1.6 ? 0.356g0.000750.062240.058900.053310.050830.002480.047320.042320.01378M1.6 ? 0.356h0.000000.062990.059650.054060.051570.002480.048070.043070.01378M1.6 ? 0.354g6g0.000750.062240.058900.053310.051730.001580.047320.043230.01378M2 ? 0.46g0.000750.077990.074250.067760.065120.002640.060940.055430.01575M2 ? 0.46h0.000000.078740.075000.068500.065870.002640.061690.056180.01575M2 ? 0.44g6g0.000750.077990.074250.067760.066100.001660.060940.056420.01575M2.5 ? 0.456g0.000790.097640.093700.086140.083350.002800.078460.072440.01772M2.5 ? 0.456h0.000000.098430.094490.086930.084130.002800.079250.073230.01772M2.5 ? 0.454g6g0.000790.097640.093700.086140.084370.001770.078460.073460.01772M3 ? 0.56g0.000790.117320.113150.104530.101570.002950.095980.089450.01969M3 ? 0.56h0.000000.118110.113940.105310.102360.002950.096770.090240.01969M3 ? 0.54g6g0.000790.117320.113150.104530.102640.001890.095980.090510.01969M3.5 ? 0.66g0.000830.136970.132050.121610.118270.003350.111380.103700.02362M3.5 ? 0.66h0.000000.137800.132870.122440.119090.003350.112200.104530.02362M3.5 ? 0.64g6g0.000830.136970.132050.121610.119530.002080.111380.104960.02362M4 ? 0.76g0.000870.156610.151100.138700.135160.003540.126770.118190.02756M4 ? 0.76h0.000000.157480.151970.139570.136020.003540.127640.119060.02756M4 ? 0.74g6g0.000870.156610.151100.138700.136500.002200.126770.119530.02756M5 ? 0.86g0.000940.195910.190000.175430.171690.003740.161810.152280.03150M5 ? 0.86h0.000000.196850.190940.176380.172640.003740.162760.153230.03150M5 ? 0.84g6g0.000940.195910.190000.175430.173070.002360.161810.153660.03150M6 ? 16g0.001020.235200.228110.209610.205200.004410.192560.180940.03937M6 ? 16h0.000000.236220.229130.210630.206220.004410.193580.181970.03937M6 ? 14g6g0.001020.235200.228110.209610.206810.002800.192560.182560.03937M8 ? 1.256g0.001100.313860.305510.281890.277240.004650.260590.246930.04921M8 ? 1.256h0.000000.314960.306610.282990.278350.004650.261690.248030.04921M8 ? 1.254g6g0.001100.313860.305510.281890.278940.002950.260590.248620.04921M8 ? 16g0.001020.313940.306850.288350.283940.004410.271300.259690.03937M8 ? 16h0.000000.314960.307870.289370.284960.004410.272320.260710.03937M8 ? 14g6g0.001020.313940.306850.288350.285550.002800.271300.261300.03937M10 ? 1.56g0.001260.392440.383150.354090.348900.005200.328500.312520.05906M10 ? 1.56h0.000000.393700.384410.355350.350160.005200.329760.313780.0590654NONMANDATORY APPENDIX CASME B1.13M-2005Table C-1Inch Translation for External Thread Limiting Dimensions M Profile (Contd)Major Diameter,Pitch Diameter, d2andMax. MinorMin. Minor Diam.dFunctional DiameterAllowance,Diameter(Rounded Form), d3NominalNote (2)Notes (2), (3), and (4)Basic ThreadTolerancees(Flat Form),Note (5)Pitch,DesignationClassNote (1)Max.Min.Max.Min.Tol.d1Note (2)(For Reference)PM10 ? 1.54g6g0.001260.392440.383150.354090.350750.003340.328500.314370.05906M10 ? 1.256g0.001100.392600.384250.360630.355980.004650.339330.325670.04921M10 ? 1.256h0.000000.393700.385350.361730.357090.004650.340430.326770.04921M10 ? 1.254g6g0.001100.392600.384250.360630.357680.002950.339330.327360.04921M10 ? 16g0.001020.392680.385590.367090.362680.004410.350040.338430.03937M10 ? 16h0.000000.393700.386610.368110.363700.004410.351060.339450.03937M10 ? 14g6g0.001020.392680.385590.367090.364290.002800.350040.340040.03937M10 ? 0.756g0.000870.392830.387320.373660.369720.003940.360870.351540.02953M10 ? 0.756h0.000000.393700.388190.374530.370590.003940.361730.352400.02953M10 ? 0.754g6g0.000870.392830.387320.373660.371180.002480.360870.352990.02953M12 ? 1.756g0.001340.471100.460670.426340.420230.005910.396500.377990.06890M12 ? 1.756h0.000000.472440.462010.427680.421770.005910.397830.379330.06890M12 ? 1.754g6g0.001340.471100.460670.426340.422600.003740.396500.380160.06890M12 ? 1.56g0.001260.471180.461890.432830.427320.005510.407240.390940.05906M12 ? 1.56h0.000000.472440.463150.434090.428580.005510.408500.392200.05906M12 ? 1.54g6g0.001260.471180.461890.432830.429290.003540.407240.392910.05906M12 ? 1.256g0.001100.471340.462990.439370.434170.005200.418070.403860.04921M12 ? 1.256h0.000000.472440.464090.440470.435280.005200.419170.404960.04921M12 ? 1.254g6g0.001100.471340.462990.439370.436020.003350.418070.405710.04921M12 ? 16g0.001020.471420.464330.445830.441180.004650.428780.416930.03937M12 ? 16h0.000000.472440.465350.446850.442200.004650.429800.417950.03937M12 ? 14g6g0.001020.471420.464330.445830.442870.002960.428780.418620.03937M14 ? 26g0.001500.549690.538660.498540.492240.006300.464450.443740.07874M14 ? 26h0.000000.551180.540160.500040.493740.006300.465940.445240.07874M14 ? 24g6g0.001500.549690.538660.498540.494610.003930.464450.446100.07874M14 ? 1.56g0.001260.549920.540630.511570.506060.005510.485980.469690.05906M14 ? 1.56h0.000000.551180.541890.512830.507320.005510.487240.470940.05906M14 ? 1.54g6g0.001260.549920.540630.511570.508030.003540.485980.471650.05906M15 ? 16g0.001020.589530.582440.563940.559290.004650.546890.535040.03937M15 ? 16h0.000000.590550.583460.564960.560310.004650.547910.536060.03937M15 ? 14g6g0.001020.589530.582440.563940.560980.002960.546890.536730.03937M16 ? 26g0.001500.628430.617400.577280.570980.006300.543190.522480.07874M16 ? 26h0.000000.629920.618900.578780.572480.006300.544690.523980.07874M16 ? 24g6g0.001500.628430.617400.577280.573350.003930.543190.524840.0787455ASME B1.13M-2005NONMANDATORY APPENDIX CTable C-1Inch Translation for External Thread Limiting Dimensions M Profile (Contd)Major Diameter,Pitch Diameter, d2andMax. MinordFunctional DiameterDiameterMin. Minor Diam.Allowance,Note (2)Notes (2), (3), and (4)(Flat Form),(Rounded Form), d3NominalBasic ThreadToleranceesd1Note (5)Pitch,DesignationClassNote (1)Max.Min.Max.Min.Tol.Note (2)(For Reference)PM16 ? 1.56g0.001260.628660.619370.590310.584800.005510.564720.548430.05906M16 ? 1.56h0.000000.629920.620630.591570.586060.005510.565980.549690.05906M16 ? 1.54g6g0.001260.628660.619370.590310.586770.003540.564720.550390.05906M17 ? 16g0.001020.668270.661180.642680.638030.004650.625630.613780.03937M17 ? 16h0.000000.669290.662200.643700.639060.004650.626650.614800.03937M17 ? 14g6g0.001020.668270.661180.642680.639720.002960.625630.615470.03937M18 ? 1.56g0.001260.707400.698110.669060.663540.005510.643460.627170.05906M18 ? 1.56h0.000000.708660.699370.670310.664800.005510.644720.628430.05906M18 ? 1.54g6g0.001260.707400.698110.669060.665510.003550.643460.629130.05906M20 ? 2.56g0.001650.785750.772560.721810.715120.006690.679170.654490.09843M20 ? 2.56h0.000000.787400.774210.723460.716770.006690.680830.656140.09843M20 ? 2.54g6g0.001650.785750.772560.721810.717640.004170.679170.657010.09843M20 ? 1.56g0.001260.786140.776850.747800.742280.005510.722200.705910.05906M20 ? 1.56h0.000000.787400.778110.749060.743540.005510.723460.707170.05906M20 ? 1.54g6g0.001260.786140.776850.747800.744250.003550.722200.707870.05906M20 ? 16g0.001020.786380.779290.760790.756140.004650.743740.731890.03937M20 ? 16h0.000000.787400.780310.761810.757170.004650.744760.732910.03937M20 ? 14g6g0.001020.786380.779290.760790.757830.002960.743740.733580.03937M22 ? 2.56g0.001650.864490.851300.800550.793860.006690.757910.733230.09843M22 ? 2.56h0.000000.866140.852950.802200.795510.006690.759570.734880.09843M22 ? 1.56g0.001260.864880.855590.826540.821020.005510.800940.784650.05906M22 ? 1.56h0.000000.866140.856850.827800.822280.005510.802200.785910.05906M22 ? 1.54g6g0.001260.864880.855590.826540.822990.003550.800940.786610.05906M24 ? 36g0.001890.942990.928230.866260.858390.007870.815120.785630.11811M24 ? 36h0.000000.944880.930120.868150.860280.007870.817010.787520.11811M24 ? 34g6g0.001890.942990.928230.866260.861340.004920.815120.788580.11811M24 ? 26g0.001500.943390.932360.892240.885550.006690.858150.837050.07874M24 ? 26h0.000000.944880.933860.893740.887050.006690.859650.838540.07874M24 ? 24g6g0.001500.943390.932360.892240.888070.004170.858150.839570.07874M25 ? 1.56g0.001260.982990.973700.944650.938740.005910.919060.902360.05906M25 ? 1.56h0.000000.984250.974960.945910.940000.005910.920310.903620.05906M25 ?1.54g6g0.001260.982990.973700.944650.940910.003740.919060.904530.0590656NONMANDATORY APPENDIX CASME B1.13M-2005Table C-1Inch Translation for External Thread Limiting Dimensions M Profile (Contd)Major Diameter,Pitch Diameter, d2andMax. MinordFunctional DiameterDiameterMin. Minor Diam.Allowance,Note (2)Notes (2), (3), and (4)(Flat Form),(Rounded Form), d3NominalBasic ThreadToleranceesd1Note (5)Pitch,DesignationClassNote (1)Max.Min.Max.Min.Tol.Note (2)(For Reference)PM27 ? 36g0.001891.061101.046340.984370.976500.007870.933230.903740.11811M27 ? 36h0.000001.062991.048230.986260.978390.007870.935120.905630.11811M27 ? 26g0.001501.061501.050471.010351.003660.006690.976260.955160.07874M27 ? 26h0.000001.062991.051971.011851.005160.006690.977760.956650.07874M27 ? 24g6g0.001501.061501.050471.010351.006180.004170.976260.957680.07874M30 ? 3.56g0.002091.179021.162281.089531.081180.008351.029840.996300.13780M30 ? 3.56h0.000001.181101.164371.091611.083270.008351.031930.998390.13780M30 ? 3.54g6g0.002091.179021.162281.089531.084330.005201.029840.999450.13780M30 ? 26g0.001501.179611.168581.128461.121770.006691.094371.073270.07874M30 ? 26h0.000001.181101.170081.129961.123270.006691.095871.074760.07874M30 ? 24g6g0.001501.179611.168581.128461.124290.004171.094371.075790.07874M30 ? 1.56g0.001261.179841.170551.141501.135590.005911.115911.099210.05906M30 ? 1.56h0.000001.181101.171811.142761.136850.005911.117171.100470.05906M30 ? 1.54g6g0.001261.179841.170551.141501.137760.003741.115911.101380.05906M33 ? 26g0.001501.297721.286691.246571.239880.006691.212481.191380.07874M33 ? 26h0.000001.299211.288191.248071.241380.006691.213981.192870.07874M33 ? 24g6g0.001501.297721.286691.246571.242400.004171.212481.193900.07874M35 ? 1.56g0.001261.376691.367401.338351.332440.005911.312761.296060.05906M35 ? 1.56h0.000001.377951.368661.339611.333700.005911.314021.297320.05906M36 ? 46g0.002361.414961.396261.312681.303860.008821.244491.206850.15748M36 ? 46h0.000001.417321.398621.315041.306220.008821.246851.209210.15748M36 ? 44g6g0.002361.414961.396261.312681.307170.005511.244491.210160.15748M36 ? 26g0.001501.415831.404801.364691.357990.006691.330591.309490.07874M36 ? 26h0.000001.417321.406301.366181.359490.006691.332091.310980.07874M36 ? 24g6g0.001501.415831.404801.364691.360510.004181.330591.312010.07874M39 ? 26g0.001501.533941.522911.482801.476100.006691.448701.427600.07874M39 ? 26h0.000001.535431.524411.484291.477600.006691.450201.429090.07874M39 ? 24g6g0.001501.533941.522911.482801.478620.004181.448701.430120.07874M40 ? 1.56g0.001261.573541.564251.535201.529290.005911.509611.492910.05906M40 ? 1.56h0.000001.574801.565511.536461.530550.005911.510871.494170.05906M40 ? 1.54g6g0.001261.573541.564251.535201.531460.003741.509611.495080.05906M42 ? 4.56g0.002481.651061.631381.535981.526690.009291.459251.417560.17717M42 ? 4.56h0.000001.653541.633861.538461.529170.009291.461731.420040.1771757ASME B1.13M-2005NONMANDATORY APPENDIX CTable C-1Inch Translation for External Thread Limiting Dimensions M Profile (Contd)Major Diameter,Pitch Diameter, d2andMax. MinordFunctional DiameterDiameterMin. Minor Diam.Allowance,Note (2)Notes (2), (3), and (4)(Flat Form),(Rounded Form), d3NominalBasic ThreadToleranceesd1Note (5)Pitch,DesignationClassNote (1)Max.Min.Max.Min.Tol.Note (2)(For Reference)PM42 ? 4.54g6g0.002481.651061.631381.535981.530080.005901.459251.420940.17717M42 ? 26g0.001501.652051.641021.600911.594210.006691.566811.545710.07874M42 ? 26h0.000001.653541.642521.602401.595710.006691.568311.547200.07874M42 ? 24g6g0.001501.652051.641021.600911.596730.004181.566811.548230.07874M45 ? 1.56g0.001261.770391.761101.732051.726140.005911.706461.689760.05906M45 ? 1.56h0.000001.771651.762361.733311.727400.005911.707721.691020.05906M45 ? 1.54g6g0.001261.770391.761101.732051.728310.003741.706461.691930.05906M48 ? 56g0.002801.886971.866101.759091.749250.009841.673861.627990.19685M48 ? 56h0.000001.889761.868901.761891.752050.009841.676651.630790.19685M48 ? 54g6g0.002801.886971.866101.759091.752800.006291.673861.631540.19685M48 ? 26g0.001501.888271.877241.837131.830040.007091.803031.781540.07874M48 ? 26h0.000001.889761.878741.838621.831540.007091.804531.783030.07874M48 ? 24g6g0.001501.888271.877241.837131.832720.004411.803031.784210.07874M50 ? 1.56g0.001261.967241.957951.928901.922600.006301.903311.886220.05906M50 ? 1.56h0.000001.968501.959211.930161.923860.006301.904571.887480.05906M50 ? 1.54g6g0.001261.967241.957951.928901.924960.003941.903311.888580.05906M55 ? 1.56g0.001262.164092.154802.125752.119450.006302.100162.083070.05906M55 ? 1.56h0.000002.165352.156062.127012.120710.006302.101422.084330.05906M55 ? 1.54g6g0.001262.164092.154802.125752.121810.003942.100162.085430.05906M56 ? 5.56g0.002952.201772.179722.061142.050710.010431.967361.917320.21654M56 ? 5.56h0.000002.204722.182682.064092.053660.010431.970311.920280.21654M56 ? 5.54g6g0.002952.201772.179722.061142.054450.006691.967361.921060.21654M56 ? 26g0.001502.203232.192202.152092.145000.007092.117992.096500.07874M56 ? 26h0.000002.204722.193702.153582.146500.007092.119492.097990.07874M56 ? 24g6g0.001502.203232.192202.152092.147680.004412.117992.099170.07874M60 ? 1.56g0.001262.360942.351652.322602.316300.006302.297012.279920.05906M60 ? 1.56h0.000002.362202.352912.323862.317560.006302.298272.281180.05906M60 ? 1.54g6g0.001262.360942.351652.322602.318660.003942.297012.282280.05906M64 ? 66g0.003152.516542.492912.363112.352090.011022.260832.206570.23622M64 ? 66h0.000002.519692.496062.366262.355240.011022.263982.209720.23622M64 ? 64g6g0.003152.516542.492912.363112.356020.007092.260832.210510.2362258NONMANDATORY APPENDIX CASME B1.13M-2005Table C-1Inch Translation for External Thread Limiting Dimensions M Profile (Contd)Major Diameter,Pitch Diam., d2andMax. MinordFunctional DiameterDiameterMin. Minor Diam.Allowance,Note (2)Notes (2), (3), and (4)(Flat Form),(Rounded Form), d3NominalBasic ThreadToleranceesd1Note (5),Pitch,DesignationClassNote (1)Max.Min.Max.Min.Tol.Note (2)(For Reference)PM64 ? 26g0.001502.518192.507172.467052.459960.007092.432952.411460.07874M64 ? 26h0.000002.519692.508662.468542.461460.007092.434452.412950.07874M64 ? 24g6g0.001502.518192.507172.467052.462640.004412.432952.414130.07874M65 ? 1.56g0.001262.557802.548502.519452.513150.006302.493862.476770.05906M65 ? 1.56h0.000002.559062.549762.520712.514410.006302.495122.478030.05906M65 ? 1.54g6g0.001262.557802.548502.519452.515510.003942.493862.479130.05906M70 ?1.56g0.001262.754652.745352.716302.710000.006302.690712.673620.05906M70 ? 1.56h0.000002.755912.746612.717562.711260.006302.691972.674880.05906M70 ?1.54g6g0.001262.754652.745352.716302.712360.003942.690712.675980.05906M72 ? 66g0.003152.831502.807872.678072.667050.011022.575792.521540.23622M72 ? 66h0.000002.834652.811022.681222.670200.011022.578942.524690.23622M72 ? 64g6g0.003152.831502.807872.678072.670980.007092.575792.525470.23622M72 ? 26g0.001502.833152.822132.782012.774920.007092.747912.726420.07874M72 ? 26h0.000002.834652.823622.783502.776420.007092.749412.727910.07874M72 ? 24g6g0.001502.833152.822132.782012.777600.004412.747912.729090.07874M75 ? 1.56g0.001262.951502.942202.913152.906850.006302.887562.870470.05906M75 ? 1.56h0.000002.952762.943462.914412.908110.006302.888822.871730.05906M75 ? 1.54g6g0.001262.951502.942202.913152.909210.003942.887562.872830.05906M80 ? 66g0.003153.146463.122832.993032.982010.011022.890752.836500.23622M80 ? 66h0.000003.149613.125982.996182.985160.011022.893902.839650.23622M80 ? 64g6g0.003153.146463.122832.993032.985940.007092.890752.840430.23622M80 ? 26g0.001503.148113.137093.096973.089880.007093.062873.041380.07874M80 ? 26h0.000003.149613.138583.098463.091380.007093.064373.042870.07874M80 ? 24g6g0.001503.148113.137093.096973.092560.004413.062873.044060.07874M80 ? 1.56g0.001263.148353.139063.110003.103700.006303.084413.067320.05906M80 ? 1.56h0.000003.149613.140313.111263.104960.006303.085673.068580.05906M80 ? 1.54g6g0.001263.148353.139063.110003.106060.003943.084413.069690.05906M85 ? 26g0.001503.344963.333943.293823.286730.007093.259723.238230.07874M85 ? 26h0.000003.346463.335433.295313.288230.007093.261223.239720.07874M85 ? 24g6g0.001503.344963.333943.293823.289410.004413.259723.240910.07874M90 ? 66g0.003153.540163.516543.386733.375710.011023.284453.230200.23622M90 ? 66h0.000003.543313.519693.389883.378860.011023.287603.233350.2362259ASME B1.13M-2005NONMANDATORY APPENDIX CTable C-1Inch Translation for External Thread Limiting Dimensions M Profile (Contd)Major Diameter,Pitch Diameter, d2andMax. MinordFunctional DiameterDiameterMin. Minor Diam.Allowance,Note (2)Notes (2), (3), and (4)(Flat Form),(Rounded Form), d3NominalBasic ThreadToleranceesd1Note (5)Pitch,DesignationClassNote (1)Max.Min.Max.Min.Tol.Note (2)(For Reference)PM90 ? 64g6g0.003153.540163.516543.386733.379650.007083.284453.234130.23622M90 ? 26g0.001503.541813.530793.490673.483580.007093.456573.435080.07874M90 ? 26h0.000003.543313.532283.492173.485080.007093.458073.436570.07874M90 ? 24g6g0.001503.541813.530793.490673.486260.004413.456573.437760.07874M95 ? 26g0.001503.738663.727643.687523.680040.007483.653433.631540.07874M95 ? 26h0.000003.740163.729133.689023.681540.007483.654923.633030.07874M95 ? 24g6g0.001503.738663.727643.687523.682870.004653.653433.634370.07874M100 ? 66g0.003153.933863.910243.780433.768620.011813.678153.623110.23622M100 ? 66h0.000003.937013.913393.783583.771770.011813.681303.626260.23622M100 ? 64g6g0.003153.933863.910243.780433.772950.007483.678153.627440.23622M100 ? 26g0.001503.935513.924493.884373.876890.007483.850283.828390.07874M100 ? 26h0.000003.937013.925983.885873.878390.007483.851773.829880.07874M100 ? 24g6g0.001503.935513.924493.884373.879720.004653.850283.831220.07874M105 ? 26g0.001504.132364.121344.081224.073740.007484.047134.025240.07874M105 ? 26h0.000004.133864.122834.082724.075240.007484.048624.026730.07874M105 ? 24g6g0.001504.132364.121344.081224.076570.004654.047134.028070.07874M110 ? 26g0.001504.329214.318194.278074.270590.007484.243984.222090.07874M110 ? 26h0.000004.330714.319694.279574.272090.007484.245474.223580.07874M110 ? 24g6g0.001504.329214.318194.278074.273430.004644.243984.224920.07874M120 ? 26g0.001504.722914.711894.671774.664290.007484.637684.615790.07874M120 ? 26h0.000004.724414.713394.673274.665790.007484.639174.617280.07874M120 ? 24g6g0.001504.722914.711894.671774.667130.004644.637684.618620.07874M130 ? 26g0.001505.116615.105595.065475.057990.007485.031385.009490.07874M130 ? 26h0.000005.118115.107095.066975.059490.007485.032875.010980.07874M130 ? 24g6g0.001505.116615.105595.065475.060830.004645.031385.012320.07874M140 ? 26g0.001505.510315.499295.459175.451690.007485.425085.403190.07874M140 ? 26h0.000005.511815.500795.460675.453190.007485.426575.404690.07874M140 ? 24g6g0.001505.510315.499295.459175.454530.004645.425085.406020.07874M150 ? 26g0.001505.904025.892995.852875.845390.007485.818785.796890.07874M150 ? 26h0.000005.905515.894495.854375.846890.007485.820285.798390.07874M150 ? 24g6g0.001505.904025.892995.852875.848230.004645.818785.799720.0787460NONMANDATORY APPENDIX CASME B1.13M-2005Table C-1Inch Translation for External Thread Limiting Dimensions M Profile (Contd)Major Diameter,Pitch Diameter, d2andMax. MinordFunctional DiameterDiameterMin. Minor Diam.Allowance,Note (2)Notes (2), (3), and (4)(Flat Form),(Rounded Form), d3NominalBasic ThreadToleranceesd1Note (5)Pitch,DesignationClassNote (1)Max.Min.Max.Min.Tol.Note (2)(For Reference)PM160 ? 36g0.001896.297326.282566.220596.211770.008826.169456.139020.11811M160 ? 36h0.000006.299216.284456.222486.213660.008826.171346.140910.11811M160 ? 34g6g0.001896.297326.282566.220596.215080.005516.169456.142320.11811M170 ? 36g0.001896.691026.676266.614296.605470.008826.563156.532720.11811M170 ? 36h0.000006.692916.678156.616186.607360.008826.565046.534610.11811M170 ? 34g6g0.001896.691026.676266.614296.608780.005516.563156.536020.11811M180 ? 36g0.001897.084727.069967.007996.999170.008826.956856.926420.11811M180 ? 36h0.000007.086617.071857.009887.001060.008826.958746.928310.11811M180 ? 34g6g0.001897.084727.069967.007997.002480.005516.956856.929720.11811M190 ? 36g0.001897.478437.463667.401697.391850.009847.350557.319090.11811M190 ? 36h0.000007.480317.465557.403587.393740.009847.352447.320980.11811M190 ? 34g6g0.001897.478437.463667.401697.395390.006307.350557.322640.11811M200 ? 36g0.001897.872137.857367.795397.785550.009847.744257.712800.11811M200 ? 36h0.000007.874027.859257.797287.787440.009847.746147.714690.11811M200 ? 34g6g0.001897.872137.857367.795397.789090.006307.744257.716340.11811GENERAL NOTE: All dimensions are in inches.NOTES:(1) es is absolute value.(2) For coated threads with tolerance classes 6g or 4g6g, see para. 8.2.(3) See para. 5.4(b).(4) Since these tabulated tolerance values have been converted and then rounded, they may differ slightly from the differ-ence between tabulated maximum and minimum values.(5) Dimension used in the design of tools, etc. In dimensioning external threads it is not normally specified. Generally,minor diameter acceptance is based on maximum material condition gaging.61ASME B1.13M-2005NONMANDATORY APPENDIX CTable C-2Inch Translation for Internal Thread Limiting Dimensions M ProfilePitch Diam., D2and FunctionalMinor Diam., D1Diam. Notes (1) and (2)Major Diam., DNominalBasic ThreadToleranceMax. Note (3)Pitch,DesignationClassMin.Max.Min.Max.Tol.Min.(Reference)PM1.6 ? 0.356H0.048070.052010.054060.057400.003350.062990.068350.01378M2 ? 0.46H0.061690.066100.068500.072050.003540.078740.084570.01575M2.5 ? 0.456H0.079250.084170.086930.090670.003740.098430.104720.01772M3 ? 0.56H0.096810.102320.105310.109250.003940.118110.124880.01969M3.5 ? 0.66H0.112200.118500.122440.126850.004410.137800.145590.02362M4 ? 0.76H0.127640.134720.139570.144210.004650.157480.166100.02756M5 ? 0.86H0.162760.170630.176380.181300.004920.196850.206300.03150M6 ? 16H0.193580.202870.210630.216540.005910.236220.247800.03937M8 ? 1.256H0.261690.272130.282990.289290.006300.314960.328350.04921M8 ? 16H0.272320.281610.289370.295280.005910.314960.326540.03937M10 ? 1.56H0.329760.341570.355350.362440.007090.393700.409330.05906M10 ? 1.256H0.340430.350870.361730.368030.006300.393700.407090.04921M10 ? 16H0.351060.360350.368110.374020.005910.393700.405280.03937M10 ? 0.756H0.361730.369210.374530.379720.005200.393700.403150.02953M12 ? 1.756H0.397870.411060.427680.435550.007870.472440.490240.06890M12 ? 1.56H0.408500.420310.434090.441570.007480.472440.488460.05906M12 ? 1.256H0.419170.429610.440470.447560.007090.472440.486610.04921M12 ? 16H0.429800.439090.446850.453150.006300.472440.484410.03937M14 ? 26H0.465940.480710.500040.508390.008350.551180.570910.07874M14 ? 1.56H0.487240.499060.512830.520310.007480.551180.567200.05906M15 ? 16H0.547910.557200.564960.571260.006300.590550.602520.03937M16 ? 26H0.544690.559450.578780.587130.008350.629920.649650.07874M16 ? 1.56H0.565980.577800.591570.599060.007480.629920.645940.05906M17 ? 16H0.626650.635940.643700.650000.006300.669290.681260.03937M18 ? 1.56H0.644720.656540.670310.677800.007480.708660.724690.05906M20 ? 2.56H0.680870.698580.723460.732280.008820.787400.810430.09843M20 ? 1.56H0.723460.735280.749060.756540.007480.787400.803430.05906M20 ? 16H0.744760.754060.761810.768110.006300.787400.799370.03937M22 ? 2.56H0.759610.777320.802200.811020.008820.866140.889170.09843M22 ? 1.56H0.802200.814020.827800.835280.007480.866140.882170.05906M24 ? 36H0.817010.836690.868150.878580.010430.944880.972360.11811M24 ? 26H0.859650.874410.893740.902560.008820.944880.965080.07874M25 ? 1.56H0.920310.932130.945910.953780.007870.984251.000670.05906M27 ? 36H0.935120.954800.986260.996690.010431.062991.090470.11811M27 ? 26H0.977760.992521.011851.020670.008821.062991.083190.07874M30 ? 3.56H1.031931.053981.091611.102640.011021.181101.2120
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