【国际标准】BS 7419-1991 SPECIFICATION FOR HOLDING DOWN BOLTS.pdf

1、BRITISH STANDARD BS 7419:1991 Specification for Holding down bolts BS 7419:1991 This British Standard, having been prepared under the direction of the General Mechanical Engineering Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 29 March

2、 1991 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference GME/9 Draft for comment 90/75944 DC ISBN 0 580 19403 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the General Mechanical Engineering

3、 Standards Policy Committee (GME/-) to Technical Committee GME/9, upon which the following bodies were represented: BEAMA Ltd British Constructional Steelwork Association Ltd British Industrial Fasteners Federation British Railways Board British Steel Industry British Steel Industry (Wire Section) G

4、auge and Tool Makers Association Ministry of Defence Society of Motor Manufacturers and Traders Limited Washer Manufacturers Association of Great Britain The following body was also represented in the drafting of the standard, through subcommittees and panels: Steel Construction Institute Amendments

5、 issued since publication Amd. No.DateComments w w w . b z f x w . c o m BS 7419:1991 BSI 12-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Dimensions1 3Characteristics6 4Complete designation for the purpose of an enquiry or order6 Figure 1 Dimensions of square head

6、 bolts3 Figure 2 Dimensions of hexagon head bolts5 Table 1 Dimensions of square head bolts2 Table 2 Dimensions of hexagon head bolts4 Table 3 Tolerance on nominal length6 Table 4 Preferred sizes6 Table 5 Characteristics6 Publication(s) referred toInside back cover w w w . b z f x w . c o m BS 7419:1

7、991 ii BSI 12-1999 Foreword This British Standard has been prepared under the authority of the General Mechanical Engineering Standards Policy Committee to provide a metric series standard for holding down bolts. A British Standard does not purport to include all the necessary provisions of a contra

8、ct. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 6, an inside back cove

9、r and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. w w w . b z f x w . c o m BS 7419:1991 BSI 12-19991 1 Scope This British Standard specifies the general dimension

10、s, tolerances, materials and mechanical properties for holding down bolts of product grade C for use in connecting steel structures to their foundations and in similar applications. Bolts with square heads and square necks are specified. Two possible forms of square neck are covered. Bolts with hexa

11、gon heads are also specified. Other forms of holding down bolts are not covered. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Dimensions The general dimensions and tolerances of holding down bolts with square heads and square necks shall be a

12、s given in Table 1 and Table 3, and Figure 1. The dimensions and tolerances of holding down bolts with hexagon heads shall be as given in Table 2 and Table 3, and Figure 2. NOTE 1Preferred sizes for square and hexagon head holding down bolts are listed in Table 4. NOTE 2Symbols and descriptions of d

13、imensions may be found in BS 6565. The symbol v is the dimension across flats of the underhead square neck. w w w . b z f x w . c o m BS 7419:1991 2 BSI 12-1999 Table 1 Dimensions of square head bolts Thread (d)M16M20M24M30M36M42M48M56M64 P (pitch) 22.533.544.555.56 bmax. 122127.5133140.5148155.5163

14、172.5182 min. 116120124130136142148156164 dsmax.16.720.8424.8430.8437434957.265.2 min.15.319.1623.1629.1635414754.862.8 knom.1012.51518.722.526303540 min.9.2511.614.117.6521.4524.9528.9533.7538.75 max.10.7513.415.919.7523.5527.0531.0536.2541.25 rmin.0.60.80.8111.21.622 snom. = max.243036465565758595

15、 min.23.1629.16354553.863.173.182.892.8 fnom.81012151821242832 min.7.259.2511.114.117.119.9522.9526.9530.75 max.8.7510.7512.915.918.922.0525.0529.0533.25 vmax.16.720.8424.8430.8437434957.265.2 min.15.319.1623.1629.1635414754.862.8 xmax.56.37.59101112.51415 NOTEDimensions are in millimetres. w w w .

16、b z f x w . c o m BS 7419:1991 BSI 12-19993 1) Incomplete threads, u k 2p. Figure 1 Dimensions of square head bolts w w w . b z f x w . c o m BS 7419:1991 4 BSI 12-1999 Table 2 Dimensions of hexagon head bolts Thread (d)M16M20M24M30M36M42M48M56M64 P (pitch) 22.533.544.555.56 bmax. 122127.5133140.514

17、8155.5163172.5182 min. 116120124130136142148156164 cmax.0.80.80.80.80.81111 damax.18.724.428.435.442.448.656.66775 dsmax.16.720.8424.8430.8437434957.265.2 min.15.319.1623.1629.1635414754.862.8 dwmin.2227.733.2542.7551.1159.9569.4578.6688.16 emin.26.1732.9539.5550.8560.7971.382.693.56104.86 knom.1012

18、.51518.722.526303540 min.9.2511.614.117.6521.4524.9528.9533.7538.75 max.10.7513.415.919.7523.5527.0531.0536.2541.25 rmin.0.60.80.8111.21.622 snom. = max.243036465565758595 min.23.1629.16354553.863.173.182.892.8 xmax.56.37.59101112.51415 NOTEDimensions are in millimetres. w w w . b z f x w . c o m BS

19、 7419:1991 BSI 12-19995 1) Incomplete threads, u k 2p. Dimension is in millimetres. Figure 2 Dimensions of hexagon head bolts w w w . b z f x w . c o m BS 7419:1991 6 BSI 12-1999 Table 3 Tolerance on nominal length l Table 4 Preferred sizes 3 Characteristics Materials, tolerances, mechanical propert

20、ies and associated nuts for holding down bolts shall be as given in Table 5. 4 Complete designation for the purpose of an enquiry or order When designating for the purpose of an enquiry or order, the following information shall be given: a) general product description, i.e. Holding down bolts; b) he

21、ad form, i.e. Square square, or Hexagon; c) the letter “M” indicating that the product is ISO metric; d) the nominal size (thread diameter) of the product in millimetres; e) the nominal length in millimetres; f) the strength grade; g) the number of this British Standard, i.e. BS 7419; h) details of

22、the associated nut in accordance with the appropriate British Standard, i.e. BS 4190, BS 3962 or BS 4395-1; i) details of the coating (if required), in accordance with the appropriate British Standard (e.g. BS 729, BS 1706, BS 4921). Examples: Square head holding down bolts 20 mm in diameter, 450 mm

23、 long, strength grade 4.6 with nuts to BS 4190 would be designated: 1) Holding down bolts, Square square M20 450, 4.6 to BS 7419, nuts to BS 4190. Hexagon head pre-loaded holding down bolts 24 mm in diameter, 600 mm long, strength grade 8.8, nuts to BS 4395-1, galvanized would be designated: 2) Pre-

24、loaded holding down bolts, Hexagon M24 600, 8.8 to BS 7419, nuts to BS 4395-1, galvanized to BS 729. Table 5 Characteristics Nominal lengthTolerance mmmm 250 k l k 315 5.20 315 l k 400 5.70 400 l k 500 6.30 500 l k 625 6.80 625 l k 800 7.20 800 l k 1 000 7.40 1 000 39 mm: as agreed Tolerance (for pr

25、oduct grade C)See BS 6322-1 Finisha) as processed b) galvanized to BS 1706 c) sherardized to BS 4921 d) electroplated to BS 1706 AcceptabilityFor acceptance procedure, see BS 6587 Associated nutsbSee BS 4190 or BS 3692 a The designation symbol for the property classes according to BS 6104-1 can also

26、 be used for thread sizes above M39, provided that the finished product has all the properties assigned to the designation symbols in BS 6104-1. b When bolts of property class 8.8 are to be preloaded, nuts and hardened washers in accordance with BS 4395-1 should be specified. w w w . b z f x w . c o

27、 m BS 7419:1991 BSI 12-1999 Publication(s) referred to BS 729, Specification for hot dip galvanized coatings on iron and steel articles. BS 1706, Method for specifying electroplated coatings of zinc and cadmium on iron and steel. BS 3643, ISO metric screw threads. BS 3643-1, Principles and basic dat

28、a. BS 3643-2, Specification for selected limits of size. BS 3692, Specification for ISO metric precision hexagon bolts, screws and nuts. Metric units. BS 4190, Specification for ISO metric black hexagon bolts, screws and nuts. BS 4395, Specification for high strength friction grip bolts and associat

29、ed nuts and washers for structural engineering. BS 4395-1, General grade. BS 4921, Specification for sherardized coatings on iron or steel. BS 6104, Mechanical properties of fasteners. BS 6104-1, Specification for bolts, screws and studs. BS 6322, Tolerances for fasteners. BS 6322-1, Specification f

30、or tolerances for bolts, screws and nuts with thread diameters U 1.6 mm and k 150 mm and product grades A, B and C. BS 6565, Method for dimensioning and designating bolts, screws, studs and nuts. BS 6587, Method of acceptance inspection for fasteners. w w w . b z f x w . c o m BS 7419:1991 BSI 389 C

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