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1、BRITISH STANDARD BS 7644-2: 1993 Direct tension indicators Part 2: Specification for nut face and bolt face washers Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:20:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7644-2:1993 This British Standard, having b
2、een 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 15 April 1993 BSI 03-1999 The following BSI references relate to the work in this standard: Committee reference GME/9 D
3、raft for comment 90/80391 DC ISBN 0 580 22017 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the General Mechanical Engineering Standards Policy Committee (GME/-) to Technical Committee GME/9, upon which the following bodies were represen
4、ted: BEAMA Ltd. British Constructional Steelwork Association Ltd. British Industrial Fasteners Federation British Railways Board British Steel Industry British Steel Industry (Wire Section) Gauge and Tool Makers Association Society of Motor Manufacturers and Traders Ltd. Washer Manufacturers Associa
5、tion of Great Britain The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Galvanizers Association Steel Construction Institute Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South
6、Bank University, Fri Dec 08 11:20:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7644-2:1993 BSI 03-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Normative references1 3Dimensions1 4Characteristics2 5Marking and identification2 6Designation2 Figure 1 Dimensions o
7、f nut face or bolt face washer1 Table 1 Dimensions of nut face washers1 Table 2 Dimensions of bolt face washers2 Table 3 Characteristics2 List of referencesInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:20:34 GMT+00:00 2006, Uncontrolled Co
8、py, (c) BSI BS 7644-2:1993 ii BSI 03-1999 Foreword This Part of BS 7644 has been prepared under the authority of the General Mechanical Engineering Standards Policy Committee. It is one Part of a standard for direct tension indicators for use in bolted joints. BS 7644-1 provides a specification for
9、compressible washers which, if used with the washers specified in this standard as part of a bolted joint, provide an indication of the tension developed in the bolt used in the joint when the joint is tightened. A British Standard does not purport to include all the necessary provisions of a contra
10、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 and 2, an inside back cov
11、er 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. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:20:34 GMT+00:00 2006, U
12、ncontrolled Copy, (c) BSI BS 7644-2:1993 BSI 03-19991 1 Scope This Part of BS 7644 specifies requirements for the general dimensions, tolerances, materials and marking of nut face washers and bolt face washers for use with compressible washer-type direct tension indicators of grades 1 and 2 of BS 76
13、44-1:1993 and high strength friction grip bolts and nuts to BS 4395-1:1969 and BS 4395-2:1969. Guidance on the use of nut face and bolt face washers is given in Annex A of BS 7644-1:1993. 2 Normative references This Part of BS 7644 incorporates, by reference, provisions from specific editions of oth
14、er publications. These normative references are cited at the appropriate points in the text and the publications are listed on the inside back cover. Subsequent amendments to, or revisions of, any of these publications apply to this Part of BS 7644 only when incorporated in it by updating or revisio
15、n. 3 Dimensions The general dimensions and tolerances of nut face and bolt face washers shall be as given in Table 1 and Table 2 and Figure 1. Table 1 Dimensions of nut face washers Dimensions in millimetres Nominal bolt diameter Internal diameter d1 External diameter, d2 Thickness h Min.Max.Min.Max
16、.Min.Max. M12 M16 M20 M22 M24 M27 M30 M33 M36 12.1 16.1 20.1 22.3 24.2 27.2 30.2 33.2 36.2 12.35 16.35 20.40 22.60 24.50 27.55 30.55 33.55 36.55 22.7 27.7 34.4 37.4 39.4 45.4 49.1 54.1 60.1 24 29 36 39 41 47 51 56 62 2.7 3.1 3.1 3.1 3.4 3.4 3.4 3.4 3.4 4.6 4.6 4.6 4.6 4.6 4.6 4.6 4.6 4.6 a The washe
17、rs are intended to fit over the major diameter of the bolt thread only. In some cases the washer internal diameter, d1, is less than the bolt shank maximum diameter specified in BS 4395-1 and BS 4395-2. Figure 1 Dimensions of nut face or bolt face washer Licensed Copy: London South Bank University,
18、London South Bank University, Fri Dec 08 11:20:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7644-2:1993 2 BSI 03-1999 Table 2 Dimensions of bolt face washers 4 Characteristics The characteristics of the washers shall be as given in Table 3. Table 3 Characteristics 5 Marking and identification 5.
19、1 Nut faced washers All nut faced washers shall be marked with an indented letter “M” on one face. 5.2 Bolt faced washers All bolt faced washers shall be marked with the indented letters “BM” on one face. 6 Designation When designating for the purpose of an enquiry or order, the following informatio
20、n shall be given: a) general product description, i.e. nut face washer; b) the letter “M” indicating that the product is ISO metric; c) the nominal size (thread diameter of associated bolt) of the product in millimetres; d) the number of this British Standard, i.e. BS 7644-2:1993; e) details of coat
21、ing (if required), and the relevant British Standard, e.g. BS 4921. Example: The designation of a nut face washer, with sherardized coating conforming to class 2 of BS 4921, for use with M20 compressible washer-type direct tension indicator of grade 1 as specified in BS 7644-1 and bolts and nuts con
22、forming to BS 4395-1 is as follows: Nut face washer, M20 of BS 7644-2, sherardized to BS 4921 Class 2. Dimensions in millimetres Nominal bolt diameter Internal diameter, d1 External diameter, d2 Thickness, h Min.Max.Min.Max.Min.Max. M12 M16 M20 M22 M24 M27 M30 M33 M36 13.20 17.20 21.34 23.34 25.34 2
23、8.34 31.34 34.50 37.50 13.70 17.70 21.84 23.84 25.84 28.84 31.84 35 38 22.7 27.7 34.4 37.4 39.4 45.4 49.1 54.1 60.1 24 29 36 39 41 47 51 56 62 2.7 3.1 3.1 3.1 3.4 3.4 3.4 3.4 3.4 4.6 4.6 4.6 4.6 4.6 4.6 4.6 4.6 4.6 CharacteristicRequirement MaterialSteel Heat treatmentHardened and tempered Hardness3
24、1 to 38 HRC (300 to 360 HV30) TolerancesaAs specified for product grade C in BS 6322-3:1992 FinishAny one of the following: a) as processed; b) sherardized coating conforming to BS 4921:1988; c) mechanical plating to the thickness specified in BS 729:1971 or BS 1706:1990 as appropriate Associated bo
25、lts and nuts BS 4395-1:1969 and BS 4395-2:1969 Direct tension indicatorsBS 7644-1:1993 AcceptabilityBS 6587:1985 a For dimensions not given in Table 1 and Table 2. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:20:34 GMT+00:00 2006, Uncontrolled Copy, (c) BS
26、I BS 7644-2:1993 BSI 03-1999 List of references (see clause 2) Normative references BSI standards publications BRITISH STANDARDS INSTITUTION, London BS 729:1971, Specification for hot dip galvanized coatings on iron and steel articles. BS 1706:1990, Method for specifying electroplated coatings of zi
27、nc and codmium on iron and steel. BS 4395, Specification for high strength friction grip bolts and associated nuts and washers for structural engineering. BS 4395-1:1969, General grade. BS 4395-2:1969, Higher grade bolts and nuts and general grade washers. BS 4921:1988, Specification for sherardized
28、 coatings on iron or steel. BS 6322, Tolerances for fasteners. BS 6322-3:1992, Specification for tolerances of plain washers for bolts, screws and nuts with nominal thread diameters from 1 mm up to and including 150 mm. Product grades A and C. BS 6587:1985, Method of acceptance inspection for fasten
29、ers. BS 7644, Direct tension indicators. BS 7644-1:1993, Specification for compressible washers. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:20:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | |
30、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BSI British Standards Institution BSI is the independent national body
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39、tails are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel: 020 8996 7070. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:20:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
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