【国际标准】ASME B18.31.2-2008 连续作用和双端螺柱.英寸系列.pdf
[国际标准]ASMEB18.31.2-2008连续作用和双端螺柱.英寸系列标准
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[国际标准]ASMEB18.31.2-2008连续作用和双端螺柱.英寸系列标准,国际标准,ASMEB18,31.2,2008,连续,作用,双端螺柱,英寸,系列,标准
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AN AMERICAN NATIO NAL STANDARDASME B18.31.2-2008Continuous and Double-End Studs (Inch Series)Copyright ASME International Provided by IHS under license with ASME Licensee=FMC Technologies /5914950002 Not for Resale, 05/13/2009 00:38:22 MDTNo reproduction or networking permitted without license from IHS-,-,ASME B18.31.2-2008Continuous andDouble-End Studs(Inch Series)AN AMERICAN NATIONAL STANDARDCopyright ASME International Provided by IHS under license with ASME Licensee=FMC Technologies /5914950002 Not for Resale, 05/13/2009 00:38:22 MDTNo reproduction or networking permitted without license from IHS-,-,标准分享网 w w w .b z f x w .c o m 免费下载Date of Issuance: November 24, 2008This Standard will be revised when the Society approves the issuance of a new edition. There willbe no addenda issued to this edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisStandard. Periodically, certain actions of the ASME B18 Committee may be published as Cases. Casesand interpretations are published on the ASME Web site under the Committee Pages at as they are issued.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 madeavailable forpublic review andcomment thatprovides an opportunityfor additional publicinput from industry,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 assume 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 2008 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.Copyright ASME International Provided by IHS under license with ASME Licensee=FMC Technologies /5914950002 Not for Resale, 05/13/2009 00:38:22 MDTNo reproduction or networking permitted without license from IHS-,-,CONTENTSForeword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ivCommittee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vCorrespondence With the B18 Committee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vi1Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12Comparison With ISO Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13Referenced Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16Body Diameter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38Points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39Thread Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .310 Screw Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .311 Materials and Mechanical Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .712 Identification Symbols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .713 Finish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .714 Workmanship . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .715 Straightness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .716 Inspection and Quality Assurance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .717 Dimensional Conformance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .718 Clearance Holes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .819 Designation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8Tables1Dimensions for Continuous Thread Studs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22Dimensions for Clamping Type Studs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43Dimensions for Tap End Studs (1.5D Engagement) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54Body Diameters for Double End Studs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65Length Tolerances for Studs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7Mandatory AppendixIStud Straightness, Referee Gage, and Gaging Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . .9iiiCopyright ASME International Provided by IHS under license with ASME Licensee=FMC Technologies /5914950002 Not for Resale, 05/13/2009 00:38:22 MDTNo reproduction or networking permitted without license from IHS-,-,标准分享网 w w w .b z f x w .c o m 免费下载FOREWORDASMEStandardsCommitteeB18fortheStandardizationofBolts,Nuts,Rivets,Screws,Washers,and Similar Fasteners (formerly American National Standards Committee B18) was organizedin March 1922 as Sectional Committee B18 under theaegis of the American Engineering StandardsCommittee (later the American Standards Association, then the United States of AmericaStandards Institute, and, as of October 6, 1969, the American National Standards Institute, Inc.)with the Society of Automotive Engineers and the American Society of Mechanical Engineers asjoint sponsors.In 1995, the SAE Ship Systems and Equipment Committee that was preparing fastener partstandards for the shipbuilding industry asked ASME Committee B18 if there was an interest indeveloping dimensional standards for studs. At the December 1995 meeting of B18 in Atlanta,it was reported that a survey by ASME showed considerable interest in establishing a subcommit-tee to develop stud standards, and 11 representatives indicated their willingness to serve on asubcommittee. Subcommittee 31 was established, and draft SAE inch and metric stud standardswere distributed for review.The first meeting of Subcommittee 31 on studs was held in April 1996, in conjunction withthe ASME B18 meetings in Chicago. Existing stud standards (IFI 136, Studs and Bolts, and IFI528, Metric Studs and Bolts) were compared with the draft SAE standards J2271, Part Standardfor Studs Continuous and Double End (Inch Series), and J2271M, Part Standard for Studs Continuous and Double End (Metric). The Subcommittee then identified the configurations tobe developed along with thread sizes and diameters to be covered. It was determined to developboth inch and metric standards covering both continuously threaded and double ended studs.A decision to develop the metric standard first was unanimously passed.As the metric standard B18.31.1M was developed, little effort was devoted to the inch standarduntil 2005. In April 2005, the Subcommittee developed basic requirements for the inch studs thatwere similar to the metric studs, with the addition of interference-fit studs using ASME B1.12threads. A draft was reviewed at the November 2006 meeting with a number of format changessuggested. How to define the nominal length for tap end studs was discussed, and a motionwas approved to identify the nominal length as the overall length rather than the protrusionlength when installed as used in ASME B18.31.1M per ISO 225 requirements.In November 2006, the Subcommittee decided that diameters from14in. to 4 in. would becovered although at the previous meeting it had been agreed to cover diameters down to SizeNo. 0. The nominal length for tap end studs was again revisited without a consensus beingreached. At the April 2007 meeting, examples of both methods of identifying the nominal lengthof tap studs were reviewed, and it was determined to use the overall length as the nominal lengthas this had been the past convention for inch studs in the United States.A draft was balloted prior to the November 2007 meeting and several disapprovals wereresolved at the meeting. It was agreed that the maximum nut end thread length would be deletedin favor of a total thread length to the last scratch, which would be the minimum thread lengthplus five thread pitches. As a result, thread gaging is simplified without affecting the overallsuitability of the studs.A reconsideration draft was balloted prior to the April 2008 meeting. The only disapprovalwas withdrawn prior to the meeting, and the Subcommittee approved several minor editorialcorrections at the meeting.This edition was approved by the American National Standards Institute on August 4, 2008.ivCopyright ASME International Provided by IHS under license with ASME Licensee=FMC Technologies /5914950002 Not for Resale, 05/13/2009 00:38:22 MDTNo reproduction or networking permitted without license from IHS-,-,ASME B18 COMMITTEEStandardization of Bolts, Nuts, Rivets, Screws,Washers, and Similar Fasteners(The following is the roster of the Committee at the time of approval of this Standard.)STANDARDS COMMITTEE OFFICERSD. A. Clever, ChairR. D. Strong, Vice ChairR. L. Crane, SecretarySTANDARDS COMMITTEE PERSONNELV. Cartina, Continental-AeroD. A. Clever, Deere & Co.A. P. Cockman, Ford Motor Co.B. D. Burnside, Alternate, Ford Motor Co.R. L. Crane, The American Society of Mechanical EngineersA. C. DiCola, Wrought Washer Co.B. A. Dusina, Federal Screw WorksJ. S. Foote, Contributing Member, Trade Association ManagementInc.D. S. George, ND IndustriesJ. Greenslade, Industrial Fasteners InstituteJ. J. Grey, Contributing Member, Fastener Consulting Services, Inc.B. Hasiuk, Contributing Member, Defense Industrial Supply CenterPhiladelphiaA. Herskovitz, ConsultantJ. Hubbard, Contributing Member, Rockford Fastener, Inc.J. Jennings, Contributing Member, Naval Surface Warfare CenterM. Keller, Contributing Member, ConsultantSUBCOMMITTEE 31 THREADED STUDSW. K. Wilcox, Chair, ConsultantC. A. Dugal, Vice Chair, Texas Screw ProductsR. L. Crane, Secretary, The American Society of MechanicalEngineersJ. F. Braden, Fasteners UnlimitedD. A. Clever, Deere & Co.D. S. George, ND IndustriesJ. Greenslade, Industrial Fasteners InstituteA. Herskovitz, ConsultantvJ. F. Koehl, Contributing Member, Spirol International GroupW. H. Kopke, ITW Assembly ShakeproofJ. G. Langenstein, Honorary Member, ConsultantW. J. Lutkus, Heli-Coil EmhartD. McCrindle, Canadian Fasteners InstituteM. D. Prasad, Contributing Member, General Motors Corp.W. L. Sakowski, Account Managers, LLCS. Savoji, ITW MedalistW. Schevey, Contributing Member, BGM Fastener Co., Inc.W. R. Stevens, RamcoR. D. Strong, General Motors Corp.S. W. Vass, ConsultantC. B. Wackrow, Contributing Member, MNP Corp.W. K. Wilcox, ConsultantC. B. Williamson, Fastenal Co.C. J. Wilson, ConsultantR. B. Wright, Contributing Member, Wright Tool Co.J. G. Zeratsky, National Rivet & Manufacturing Co.J. Jennings, Naval Surface Warfare CenterJ. F. McCarrick, Defense Supply Center PhiladelphiaR. B. Meade, Atrona Material Testing Laboratories, Inc.W. Schevey, BGM Fastener Co., Inc.G. M. Simpson, Semblex Corp.W. R. Stevens, MNP Corp.R. D. Strong, General Motors Corp.C. B. Wackrow, MNP Corp.C. B. Williamson, Fastenal Co.C. J. Wilson, Industrial Fasteners InstituteCopyright ASME International Provided by IHS under license with ASME Licensee=FMC Technologies /5914950002 Not for Resale, 05/13/2009 00:38:22 MDTNo reproduction or networking permitted without license from IHS-,-,标准分享网 w w w .b z f x w .c o m 免费下载CORRESPONDENCE WITH THE B18 COMMITTEEGeneral. ASME Standards are developed and maintained with the intent to represent theconsensus of concerned interests. As such, users of this Standard may interact with the Committeeby requesting interpretations, proposing revisions, and attending Committee meetings. Corre-spondence should be addressed to:Secretary, B18 Standards CommitteeThe American Society of Mechanical EngineersThree Park AvenueNew York, NY 10016-5990Proposing Revisions. Revisions are made periodically to the Standard to incorporate changesthat appear necessary or desirable, as demonstrated by the experience gained from the applicationof the Standard. Approved revisions will be published periodically.The Committee welcomes proposals for revisions to this Standard. Such proposals should beas specific as possible, citing the paragraph number(s), the proposed wording, and a detaileddescription of the reasons for the proposal, including any pertinent documentation.Proposing a Case. Cases may be issued for the purpose of providing alternative rules whenjustified, to permit early implementation of an approved revision when the need is urgent, or toprovide rules not covered by existing provisions. Cases are effective immediately upon ASMEapproval and shall be posted on the ASME Committee Web page.Requests for Cases shall provide a Statement of Need and Background Information. The requestshould identify the standard, the paragraph, figure or table number(s), and be written as aQuestion and Reply in the same format as existing Cases. Requests for Cases should also indicatethe applicable edition(s) of the standard to which the proposed Case applies.Interpretations. Upon request, the B18 Standards Committee will render an interpretation ofany requirement of the Standard. Interpretations can only be rendered in response to a writtenrequest sent to the Secretary of the B18 Standards Committee.The request for an interpretation should be clear and unambiguous. It is further recommendedthat the inquirer submit his/her request in the following format:Subject:Cite the applicable paragraph number(s) and the topic of the inquiry.Edition:Cite the applicable edition of the Standard for which the interpretation isbeing requested.Question:Phrase the question as a request for an interpretation of a specific requirementsuitable for general understanding and use, not as a request for an approvalof a proprietary design or situation. The inquirer may also include any plansor drawings, which are necessary to explain the question; however, theyshould not contain proprietary names or information.RequeststhatarenotinthisformatmayberewrittenintheappropriateformatbytheCommitteeprior to being answered, which may inadvertently change the intent of the original request.ASME procedures provide for reconsideration of any interpretation when or if additionalinformation that might affect an interpretation is available. Further, persons aggrieved by aninterpretation may appeal to the cognizant ASME Committee or Subcommittee. ASME does not“approve,” “certify,” “rate,” or “endorse” any item, construction, proprietary device, or activity.Attending Committee Meetings. TheB18StandardsCommitteeregularlyholdsmeetings,whichare open to the public. Persons wishing to attend any meeting should contact the Secretary ofthe B18 Standards Committee.viCopyright ASME International Provided by IHS under license with ASME Licensee=FMC Technologies /5914950002 Not for Resale, 05/13/2009 00:38:22 MDTNo reproduction or networking permitted without license from IHS-,-,ASME B18.31.2-2008CONTINUOUS AND DOUBLE-END STUDS (INCH SERIES)1INTRODUCTION1.1 Scope1.1.1This Standard covers the complete dimen-sional and general data for continuous thread and dou-ble-end inch-dimensioned studs recognized asAmerican National Standard. The following configura-tions are covered:continuous thread stud: studs that are threaded over theircomplete length.double-end stud (clamping type identical ends): studswith screw threads of thesame length and configurationon each end. This type of stud serves the function ofclamping two bodies together with a nut on each end.double-end stud (tap end type): a stud designed to beinstalled in a tapped hole and usually with differentthreaded lengths on each end. For the tap end of thestuds, both regular unified threads and interference-fitthreads are covered.Double-end studs of the following body diametersare covered:(a) reduced diameter body (see para. 6.1 fordimensions)(b) full body (see para. 6.2 for dimensions)1.1.2The inclusion of dimensional data in thisStandard is not intended to imply that all productsdescribedarestockproductionitems.Consumersshouldconsult with suppliers concerning availability ofproducts.2COMPARISON WITH ISO DOCUMENTSInch-dimensioned stud standards have not beenissued by ISO.3REFERENCED STANDARDSThe following is a list iof publications referenced inthsi Standard. Unless otherwise specified, the referenceshall be to the most recent issue at the time of orderplacement.ASME B1.1, Unified Inch Screw Threads (UN and UNRThread Form)ASME B1.3M, Screw Thread Gaging Systems forDimensional Acceptability Inch and Metric ScrewThreads (UN, UNR, UNJ, M, and MJ)1ASME B1.12, Class 5 Interference-Fit ThreadASME B18.2.8, Clearance Holes for Bolts, Screws, andStudsASME B18.12, Glossary of Terms for MechanicalFastenersASME B18.18.2, Inspection and Quality Assurance forHigh-Volume Machine Assembly FastenersASME B18.24, Part Identifying Number (PIN) CodeSystem Standard for B18 Fastener ProductsASME Y14.5M, Dimensioning and TolerancingPublisher: The American Society of MechanicalEngineers (ASME), Three Park Avenue, New York,NY 10016-5990; Order Department: 22 Law Drive,P.O. Box 2300, Fairfield, NJ 07007-2300ASTMA354,QuenchedandTemperedAlloySteelBolts,Studs, and Other Externally Threaded FastenersASTM A 380, Standard Practice for Cleaning, Descaling,and Passivation of Stainless Steel Parts, Equipment,and SystemsASTM A 449, Quenched and Tempered Steel Boltsand StudsASTM F 468, Nonferrous Bolts, Hex Cap Screws, andStuds for General UseASTM F 593, Stainless Steel Bolts, Hex Cap Screws,and StudsASTM F 788/F 788M, Surface Discontinuities of Bolts,Screws, and Studs, Inch and Metric SeriesASTM F 1941, Electrodeposited Coatings on ThreadedFasteners Unified Inch Screw Threads (UN/UNR)Publisher:ASTMInternational(ASTM),100BarrHarborDrive, P.O. Box C700, West Conshohocken, PA19428-2959SAE J429, Mechanical and Material Requirements forExternally Threaded FastenersPublisher: Society of Automotive Engineers (SAE), 400Commonwealth Drive, Warrendale, PA 15096-00014TERMINOLOGYFor definitions of terms relating to fasteners or fea-turesthereofusedinthisStandard,refertoASMEB18.12.5DIMENSIONS(a) All dimensions in this Standard are given ininches,andapplybeforecoating,unlessotherwisespeci-fied. Table 1 contains the dimensions for continuousCopyright ASME International Provided by IHS under license with ASME Licensee=FMC Technologies /5914950002 Not for Resale, 05/13/2009 00:38:22 MDTNo reproduction or networking permitted without license from IHS-,-,标准分享网 w w w .b z f x w .c o m 免费下载ASME B18.31.2-2008Table 1Dimensions for Continuous Thread StudsUULTDNote (1)Threads Per Inch Note (2)Umaxp 2 Thread Pitches p 2PNominalDiameter,SizeDUNCUNF8UNUNC ThreadsUNF Threads8UN Threads140.25002028. . .0.1000.071. . .5160.31251824. . .0.1110.083. . .380.37501624. . .0.1250.083. . .7160.43751420. . .0.1430.100. . .120.50001320. . .0.1540.100. . .916Note (3)0.56251218. . .0.1670.111. . .580.62501118. . .0.1820.111. . .340.75001016. . .0.2000.125. . .780.8750914. . .0.2220.143. . .11.0000812. . .0.2500.167. . .1181.125071280.2860.1670.2501141.250071280.2860.1670.2501381.375061280.3330.1670.2501121.500061280.3330.1670.2501581.6250. . . . .8. . . . .0.2501341.75005. . .80.400. . .0.2501781.8750. . . . .8. . . . .0.25022.0000412. . .80.444. . .0.2502142.2500412. . .80.444. . .0.2502122.50004. . .80.500. . .0.2502342.75004. . .80.500. . .0.25033.00004. . .80.500. . .0.2503143.25004. . .80.500. . .0.2503123.50004. . .80.500. . .0.2503343.75004. . .80.500. . .0.25044.00004. . .80.500. . .0.250NOTES:(1) See section 8 for end requirements.(2) See section 7 for requirements on stud lengths.(3) Nonpreferred size; not recommended for new design due to limited availability.2Copyright ASME International Provided by IHS under license with ASME Licensee=FMC Technologies /5914950002 Not for Resale, 05/13/2009 00:38:22 MDTNo reproduction or networking permitted without license from IHS-,-,ASME B18.31.2-2008thread studs. Table 2 contains the thread length dimen-sions for double-end (clamping type) studs. Table 3 con-tains the thread length requirements for tap end studs.Table 4 contains the body diameters for double-end(clamping type) studs and tap end studs.(b) Symbols specifying geometric characteristics arein accordance with ASME Y14.5M.6BODY DIAMETERThe diameter of the body on studs that are notthreaded the full length shall be within the limits for DSspecified for the applicable configuration. Unless other-wise specified by the purchaser, the reduced diameterbody or full body may be supplied at the option of thesupplier.6.1 Reduced Diameter BodyThe maximum body diameter is the minimum majordiameter of the thread as defined in ASME B1.1. Theminimumbodydiameteristheminimumpitchdiameterof the thread as defined in ASME B1.1. Dimensions areprovided in Table 4.6.2 Full BodyThemaximumbodydiameteristhesameasthenomi-nal diameter of the fastener. The minimum body diame-ter is the minimum major diameter for the applicablethreads as shown in ASME B1.1, Table 3A. These dimen-sions are provided in Table 4.NOTE:If the two ends of a stud have different threads, the mini-mum body diameter will be based on the thread with smallerminimum major diameter.7LENGTH7.1 Overall LengthThe overall length, LT, of the stud is the distance,parallel to the axis of the stud from one end to the otherend, measured to the extreme condition on each end.Tolerances for overall stud lengths are given in Table 5.7.2 Nominal LengthFor both continuous and double-end type studs, thenominal length is the same as the overall length withouttolerances.7.3 Length IncrementsStud lengths shall be in whole inches and one-quarterinch increments for lengths through 10 in. For studlengths greater than 10 in., lengths shall be in wholeinches and one-half inch increments.8POINTSUnless otherwise specified, studs with either pointedor unpointed ends may be provided. The ends shall besuitable for marking.38.1 Pointed EndsPointed ends shall be chamfered from a diameterequal to or slightly less than the thread root diameter.The length of the point to the first full formed threadat major diameter, as determined by the distance thepoint enters into a cylindrical NOT GO major diameterring gage, shall not exceed Umax. Umaxis equal to twothread pitches. The ends of the stud shall be reasonablysquare with the axis of the stud, but the slight rim orcup resulting from manufacturing shall be permissible.8.2 Unpointed EndsUnpointed ends may be plain sheared or cut ends,and the slight rim or cup resulting from manufacturingshall be permissible.9THREAD LENGTH(a) For continuously threaded studs, the entire lengthof the stud shall be threaded except for the ends, asdenoted by dimension U in Table 1.(b) For double-end studs, full threads are required forthe lengths B and BM, except for the ends, as denotedby dimension U in Tables 2 and 3.(c) The transition from full thread to incompletethreadshallbesmoothanduniform.Themajordiameterforincompletethreadsshallnotexceedtheactualdiame-ter of the complete (full form) threads.(d) For the nut ends of studs, the transition from fullthread to no thread shall be within five thread pitchesfrom the minimum full thread length, B.10SCREW THREADS10.1 UNC, UNF, and 8UN Thread Series andTolerance ClassThreads shall be unified inch coarse, fine, or 8-threadseries Class 2A in accordance with ASME B1.1. Unlessotherwise specified by the purchaser, coated and platedthreads shall conform to the maximum limit ofClass 3A (GO) and the minimum limit of Class 2A(NOT GO).10.2 Class 5 Interference-Fit Threads (For Tap EndStuds)In addition to the threads identified in para. 10.1,interference-fit threads may be ordered for the tap endoftapendtypestuds.Thesethreadsshallbeinterferencefit (Class 5) of the modified National thread form inthe coarse thread series (NC) in sizes 0.250 in. through1.500 in. in accordance with ASME B1.12 as specifiedby the purchaser.10.3 Thread GagingUnless otherwise specified, dimensional acceptabilityofscrewthreadsshallbedeterminedbasedonSystem21of ASME B1.3M.Copyright ASME International Provided by IHS under license with ASME Licensee=FMC Technologies /5914950002 Not for Resale, 05/13/2009 00:38:22 MDTNo reproduction or networking permitted without license from IHS-,-,标准分享网 w w w .b z f x w .c o m 免费下载ASME B18.31.2-2008Table 2Dimensions for Clamping Type StudsFull BodyReduced BodyUULTDDSBBUULTDDRBBNote (1)Note (1)Nut End Minimum Full Thread Length,BminNote (3)Umaxp 2 Thread Pitches Note (4)NominalDiameter, DSizeNote (2)L 1010 16UNC ThreadsUNF Threads8UN Threads140.25000.7501.0001.5000.1000.071. . .5160.31250.8751.1251.6250.1110.083. . .380.37501.0001.2501.7500.1250.083. . .7160.43751.1251.3751.8750.1430.100. . .120.50001.2501.5002.0000.1540.100. . .916Note (5)0.56251.3751.6252.1250.1670.111. . .580.62501.5001.7502.2500.1820.111. . .340.75001.7502.0002.5000.2000.125. . .780.87502.0002.2502.7500.2220.143. . .11.00002.2502.5003.0000.2500.167. . .1181.12502.5002.7503.2500.2860.1670.2501141.25002.7503.0003.5000.2860.1670.2501381.37503.0003.2503.7500.3330.1670.2501121.50003.2503.5004.0000.3330.1670.2501581.62503.5003.7504.250. . . . .0.2501341.75003.7504.0004.5000.400. . .0.2501781.87504.0004.2504.750. . . . .0.25022.00004.2504.5005.0000.444. . .0.2502142.25004.7505.0005.5000.444. . .0.2502122.50005.2505.5006.0000.500. . .0.2502342.75005.7506.0006.5000.500. . .0.25033.0000. . .6.5007.0000.500. . .0.2503143.2500. . .7.0007.5000.500. . .0.2503123.5000. . .7.5008.0000.500. . .0.2503343.7500. . .8.0008.5000.500. . .0.25044.0000. . .8.5009.0000.500. . .0.250NOTES:(1) See section 8 for end requirements.(2) Total thread length to the last scratch shall not exceed Bminplus five thread pitches.(3) See Table 4 for body diameters for full body or reduced body studs.(4) See Table 5 for tolerances on overall stud lengths.(5) Nonpreferred size; not recommended for new design due to limited availability.4Copyright ASME International Provided by IHS under license with ASME Licensee=FMC Technologies /5914950002 Not for Resale, 05/13/2009 00:38:22 MDTNo reproduction or networking permitted without license from IHS-,-,ASME B18.31.2-2008Table 3Dimensions for Tap End Studs (1.5D Engagement)Tap endNut endTap endNut endFull BodyReduced BodyUULTDDSBMBDRS (ref.)UULTDBMBS (ref.)Note (1)NominalSizeTap End Full ThreadUmaxp 2PMinimum Nut End Full Thread Length,Diameter,Length, BMBminNote (3)DUNC &Note (2)NominalMin.Max.NC-5 ThreadUNF Thread8UN ThreadL 1010 16140.3750.3500.4000.1000.071. . .0.7501.0001.5005160.4690.4400.4980.1110.083. . .0.8751.1251.625380.5630.5320.5940.1250.083. . .1.0001.2501.7507160.6560.6200.6920.1430.100. . .1.1251.3751.875120.7500.7080.7920.1540.100. . .1.2501.5002.000916Note (4)0.8440.8020.8960.1670.111. . .1.3751.6252.125580.9380.8920.9830.1820.111. . .1.5001.7502.250341.1251.0751.1750.2000.125. . .1.7502.0002.500781.3131.2581.3680.2220.143. . .2.0002.2502.75011.5001.4381.5620.2500.167. . .2.2502.5003.0001181.6881.6251.7500.2860.1670.2502.5002.7503.2501141.8751.8131.9380.2860.1670.2502.7503.0003.5001382.0632.0002.1250.3330.1670.2503.0003.2503.7501122.2502.1882.3130.3330.1670.2503.2503.5004.0001582.4382.3752.500. . . . .0.2503.5003.7504.2501342.6252.5632.6880.400 Note (5). . .0.2503.7504.0004.5001782.8132.7502.875. . . . .0.2504.0004.2504.75023.0002.9253.0750.444 Note (5). . .0.2504.2504.5005.0002143.3753.3003.4500.444 Note (5). . .0.2504.7505.0005.5002123.7503.6753.8250.500 Note (5). . .0.2505.2505.5006.0002344.1254.0504.2000.500 Note (5). . .0.2505.7506.0006.50034.5004.4254.5750.500 Note (5). . .0.250. . .6.5007.0003144.8754.7754.9750.500 Note (5). . .0.250. . .7.0007.5003125.2505.1505.3500.500 Note (5). . .0.250. . .7.5008.0003345.6255.5255.7250.500 Note (5). . .0.250. . .8.0008.50046.0005.9006.1000.500 Note (5). . .0.250. . .8.5009.000GENERAL NOTE:B p full nut end thread lengthBMp tap end thread length (full threads)LTp overall length (nominal length). See para. 7.3 for length increments and Table 5 for tolerances on overall stud lengths.S p standoff (when installed) p LT BMU p length to first full form threadNOTES:(1) See section 8 for end requirements.(2) Total thread length to the last scratch shall not exceed Bminplus five thread pitches.(3) See Table 4 for body diameters for full body or reduced body studs.(4) Nonpreferred size; not recommended for new design due to limited availability.(5) UNC only.5Copyright ASME International Provided by IHS under license with ASME Licensee=FMC Technologies /5914950002 Not for Resale, 05/13/2009 00:38:22 MDTNo reproduction or networking permitted without license from IHS-,-,标准分享网 w w w .b z f x w .c o m 免费下载ASME B18.31.2-2008Table 4Body Diameters for Double-End StudsMinimum Body Diameter, DS, for FullBody Studs and Maximum BodyDiameter, DR, for Reduced Body StudsMinimum Body Diameter, DR, for ReducedNote (1)Body Studs Note (1)Nominal Diameter, D,Nominaland Maximum Full BodyUNC and NC-5UNF8UNUNC and NC-5UNFSizeNote (1) Diameter, DsHF ThreadsThreadsThreadsHF ThreadsThreads8UN Threads140.25000.2410.243. . .0.2130.223. . .5160.31250.3030.304. . .0.2710.281. . .380.37500.3640.367. . .0.3290.343. . .7160.43750.4260.428. . .0.3850.400. . .120.50000.4880.491. . .0.4440.462. . .916Note (2)0.56250.5500.552. . .0.5020.521580.62500.6110.615. . .0.5590.583. . .340.75000.7350.739. . .0.6770.703. . .780.87500.8590.863. . .0.7950.822. . .11.00000.9830.987. . .0.9100.938. . .1181.12501.1061.1121.1081.0231.0631.0351141.25001.2311.2371.2331.1481.1881.1601381.37501.3541.3621.3581.2561.3131.2841121.50001.4791.4871.4831.3811.4381.4091581.6250. . . . .1.608. . . . .1.5341341.75001.727 Note (3). . .1.7331.609 Note (3). . .1.6591781.8750. . . . .1.858. . .1.78422.00001.975 Note (3). . .1.9831.843 Note (3). . .1.9092142.25002.225 Note (3). . .2.2332.093 Note (3). . .2.1582122.50002.473 Note (3). . .2.4832.324 Note (3). . .2.4082342.75002.723 Note (3). . .2.7332.574 Note (3). . .2.65833.00002.973 Note (3). . .2.9822.824 Note (3). . .2.9083143.25003.223 Note (3). . .3.2323.073 Note (3). . .3.1583123.50003.473 Note (3). . .3.4823.323 Note (3). . .3.4073343.75003.723 Note (3). . .3.7323.573 Note (3). . .3.65744.00003.973 Note (3). . .3.9823.823 Note (3). . .3.907GENERAL NOTE:See Table 2 for figures of double-end (clamping type) studs and Table 3 for figures of double-end (tap end type) studs.NOTES:(1) Minimum and maximum body dimensions apply before coating. See para. 5(a).(2) Nonpreferred size; not recommended for new design due to limited availability.(3) UNC threads only.6Copyright ASME International Provided by IHS under license with ASME Licensee=FMC Technologies /5914950002 Not for Resale, 05/13/2009 00:38:22 MDTNo reproduction or networking permitted without license from IHS-,-,ASME B18.31.2-2008Table 5Length Tolerances for StudsLength TolerancesNominal Length Note (1)Clamping andOverThroughTap End StudsContinuous Thread Studs122120.030.0421240.050.08480.080.108160.100.1216. . .0.120.18NOTE:(1) Nominal length, LT, is overall length for all types of studs.11MATERIALS AND MECHANICAL PROPERTIES11.1 SteelUnless otherwise specified, steel studs shall conformto the requirements of ASTM A 354, SAE J429, orASTM A 449, as identified by the purchaser.11.2 Corrosion-Resistant SteelsUnless otherwise specified, studs of corrosion-resistant steels shall conform to the requirements ofASTM F 593, including passivation in accordance withASTM A 380.11.3 Nonferrous MetalsUnless otherwise specified, nonferrous studs shallconform to the requirements of ASTM F 468.12IDENTIFICATION SYMBOLSMarkings shall be located on either the ends or thebodies of the studs unless otherwise specified.12.1 Property Class SymbolEach stud shall be marked in accordance with therequirements of the applicable specification (seesection11)foritschemicalandmechanicalrequirements.For tap end studs, the material property class symbolshall be marked on the nut end or the body.12.2 Source SymbolsEach stud of a size requiring marking shall be markedto identify its source (manufacturer or private labeldistributor).13FINISHUnless otherwise specified, studs shall be suppliedwith a natural (as processed) finish, unplated oruncoated,inacleancondition,andlightlyoiled.Platingsand coatings are not recommended for interference-fitstuds. Requirements for zinc plating are contained inASTM F 1941.714WORKMANSHIPUnless otherwise specified, studs shall be free fromsurface imperfections such as burrs, seams, laps, loosescale, or other irregularities that could affect serviceabil-ity. When control of surface discontinuities is required,thepurchasershallspecifyconformancetoASTMF788/F 788M.15STRAIGHTNESSAt maximum material limit, studs must be straightwithin the limit established by the straightness or cam-ber tolerance value, T, based on the overall length, LT,of the stud as identified below and expressed as a two-place decimal. The referee gage and gaging procedurefor checking straightness are provided in MandatoryAppendix I.(a) T p 0.006 LT, where LT 6 in. (for fractional inches,round to next larger full inch)(b) T p 0.008 LT, where LT 6 in. (for fractional inches,round to next larger full inch)16INSPECTION AND QUALITY ASSURANCEStuds shall be inspected to determine conformancewith this Standard. Inspection procedures may be speci-fied by the purchaser on the inquiry, purchase order, orthe engineering drawings, or shall be as agreed uponbetween the purchaser and supplier prior to acceptanceof the order. In the absence of a defined agreement, therequirements of ASME B18.18.2 shall apply.17DIMENSIONAL CONFORMANCE17.1 Designated Characteristics(a) Unlessotherwisespecified,thecharacteristicsdes-ignated below shall be inspected for conformance usingthe sampling plan in ASME B18.18.2.(b) If a documented, statistically based, in-processinspection system that assures quality equivalent toASME B18.18.2 or better using sample sizes in theinspection system, inspections may be conducted at anyCopyright ASME International Provided by IHS under license with ASME Licensee=FMC Technologies /5914950002 Not for Resale, 05/13/2009 00:38:22 MDTNo reproduction or networking permitted without license from IHS-,-,标准分享网 w w w .b z f x w .c o m 免费下载ASME B18.31.2-2008point after which that characteristic will not be altered.CharacteristicInspection Le
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