1、BSI Standards PublicationBS 3692:2014ISO metric precisionhexagon bolts, screws andnuts SpecificationPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the documentwas last issued. The British Standards Institution 2014Published by BSI Standards Lim
2、ited 2014ISBN 978 0 580 83041 9ICS 21.060.10; 21.060.20The following BSI references relate to the work on this document:Committee reference FME/9Draft for comment 14/30283396 DCPublication historyFirst published December 1963Second edition, August 1967Third edition, February 2001Fourth (present) edi
3、tion, October 2014Amendments issued since publicationDate Text affectedBS 3692:2014 BRITISH STANDARDContentsForeword iii1 Scope 12 Normative references 13 Information and requirements to be agreed and documented 24 General dimensions 35 Length of bolts and screws 36 Ends of bolts and screws 47 Screw
4、 threads 58 Length of thread on bolts and screws 59 Dimensions of bolts and screws 610 Angularity and eccentricity of bolts, screws and nuts 1111 Dimensions of nuts 1112 Chamfering, washer facing and countersinking bolts, screws and nuts 1713 Material and manufacture of steel bolts and screws 1714 M
5、echanical properties of steel bolts and screws 1815 Strength grade designation system for steel nuts 1916 Material and manufacture of steel nuts 1917 Mechanical properties of steel nuts (excluding thin nuts) 2018 Drilled bolts with split pin holes 2319 Finishes 2320 Marking and identification 2321 I
6、nspection and testing 24AnnexesAnnex A (informative) Strength grade designation system for steel bolts andscrews 25Annex B (informative) Recommended gauge for checking squareness of threadto face of nut 25Annex C (normative) Testing of mechanical properties of steel nuts 26Annex D (informative) Asso
7、ciation of bolt and screw lengths and diameters(see Clause 8) 27Annex E (informative) Basis for the derivation of tolerances 33Annex F (informative) Manufacturers recommended range of sizes 38Bibliography 40List of figuresFigure 1 Rounded end 5Figure 2 Rolled thread end 5Figure 3 Hexagon head bolt,
8、washer-faced 6Figure 4 Hexagon head screw, washer-faced 7Figure 5 Full bearing head 7Figure 6 Normal thickness nut 11Figure 7 Thin nut 12Figure 8 Enlarged view of nut countersunk 12Figure 9 Slotted nut. Sizes M4 to M39 only (six slots) 15Figure 10 Castle nut. Sizes M12 to M39 only (six slots) 15Figu
9、re 11 Castle nut. Sizes M42 to M68 only (eight slots) 15Figure 12 Depth of decarburization on steel bolts and screws 18Figure B.1 Nut squareness gauge 25Figure C.1 Proof load test for nut 26Figure E.1 Widths across flats 33Figure E.2 Widths across corners 33Figure E.3 Heights of heads 33Figure E.4 S
10、hank diameter of full size bolts 33Figure E.5 Nominal length 34Figure E.6 Thread lengths 34Figure E.7 Eccentricity of the head 34BRITISH STANDARD BS 3692:2014 The British Standards Institution 2014 iFigure E.8 Angularity of the head 34Figure E.9 Eccentricity between shank and thread 34Figure E.10 Ec
11、centricity of split pin hole 35Figure E.11 Widths across flats 35Figure E.12 Widths across corners 35Figure E.13 Thicknesses of nuts 36Figure E.14 Dimensions of slots 36Figure E.15 Eccentricity of the hexagon 36Figure E.16 Eccentricity of the slots 37Figure E.17 Angularity of the nuts 37List of tabl
12、esTable 1 Tolerances on the standard nominal lengths of bolts and screws 4Table 2 Thread tolerance classes 5Table 3 Basis for standard thread lengths 5Table 4a ISO metric precision hexagon bolts and screws 8Table 4b ISO metric precision hexagon bolts and screws 9Table 5 ISO metric precision hexagon
13、nuts and thin nuts 13Table 6 ISO metric precision hexagon slotted nuts and castle nuts 16Table 7 Strength grade designation of steel nuts 19Table 8 Recommended bolt and nut combinations 19Table 9 Chemical composition of steel nuts 20Table 10 Mechanical properties of steel nuts 20Table 11 Proof loads
14、 for steel nuts (coarse pitch series) 21Table 12 Finishes 23Table 13 Marking of nuts 24Table A.1 Strength grade designations of steel bolts and screws 25Table D.1a Preferred standard sizes of ISO metric precision hexagon bolts andscrews 28Table D.1b Preferred standard sizes of ISO metric precision h
15、exagon bolts andscrews 30Table D.2 Standard thread lengths and the shortest lengths designated asbolts, related to diameter 32Table F.1 Hexagon head bolts 38Table F.2 Hexagon head screws 39Summary of pagesThis document comprises a front cover, an inside front cover, pages i to iv,pages 1 to 40, an i
16、nside back cover and a back cover.BRITISH STANDARDBS 3692:2014ii The British Standards Institution 2014ForewordPublishing informationThis British Standard is published by BSI Standards Limited, under licence fromThe British Standards Institution, and came into effect on 31 October 2014. Itwas prepar
17、ed by Technical Committee FME/9, Nuts and accessories. A list oforganizations represented on this committee can be obtained on request to itssecretary.SupersessionThis British Standards supersedes BS 3692:2001, which is withdrawn.Relationship with other publicationsThis British Standard should be re
18、ad in conjunction with BS EN ISO 898-1 as itcontains tables that reflect up-to-date best practice for mechanical properties ofbolts.Information about this documentThe mechanical properties of the nuts in this British Standard do not conform toBS EN ISO 898-2. Higher proof load values have been alloc
19、ated to the revisedproperty classes in BS EN ISO 898-2 in order to ensure that fracture of the boltgenerally occurs in the case of overloading.CAUTION. Nuts in accordance with this standard cannot be fully loaded withsufficient assurance up to the yield point of the appropriate bolt, or beyondthis,
20、without the possibility of the nut thread being stripped, and for thisreason it is essential that new designs of nuts for use with BS 3692 bolts andstuds conforming to this standard conform to BS EN ISO 898-2.In order to differentiate nuts that conform to this British standard from thatthose that co
21、nform to BS EN ISO 898-2 vertical bars have been added to thesymbols for strength grade designations e.g. |8| instead of 8.It has been assumed in the preparation of this British Standard that theexecution of its provisions will be entrusted to appropriately qualified andexperienced people, for whose
22、 use it has been produced.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Itsrequirements are expressed in sentences in which the principal auxiliary verb is“shall”.Commentary, explanation and general informative material is presented insmaller i
23、talic type, and does not constitute a normative element.Requirements in this standard are drafted in accordance with Rules for thestructure and drafting of UK standards, subclause J.1.1, which states,“Requirements should be expressed using wording such as: When tested asdescribed in Annex A, the pro
24、duct shall .”. This means that only those productsthat are capable of passing the specified test will be deemed to conform to thisstandard.Contractual and legal considerationsThis publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct
25、 application.BRITISH STANDARD BS 3692:2014 The British Standards Institution 2014 iiiCompliance with a British Standard cannot confer immunity from legalobligations.BRITISH STANDARDBS 3692:2014iv The British Standards Institution 20141 ScopeThis standard gives the general dimensions and tolerances o
26、f precision hexagonbolts, screws and nuts with ISO metric threads in diameters from 1.6 mm to68 mm inclusive.This standard specifies mechanical properties of bolts, screws and nuts made ofcarbon steel and alloy steel when tested at an ambient temperature range of10 C to 35 C.NOTE 1 Fasteners (the te
27、rm used when bolts, screws and nuts are considered alltogether) that conform to the requirements of this standard are evaluated at thisambient temperature range. They might not retain the specified mechanical andphysical properties at elevated temperatures and/or lower temperatures.This standard is
28、not applicable to fasteners used in applications outside of therange 50 C to +150 C.NOTE 2 Fasteners conforming to the requirements of this standard are used inapplications ranging from 50 C to +150 C. The use of fasteners in applicationsoutside of this range, and up to a maximum temperature of +300
29、 C, might need tobe based on the advice of an experienced fastener metallurgist for determiningappropriate choices for a given application.NOTE 3 Nuts in accordance with this standard cannot be fully loaded with sufficientassurance up to the yield point of the appropriate bolt, or beyond this, witho
30、ut thepossibility of the nut thread being stripped, and for this reason it is essential thatnew designs of nuts for use with BS 3692 bolts and studs conforming to thisstandard conform to BS EN ISO 898-2.NOTE 4 Nuts with an effective height of less than 0.6d and/or with a width acrossflats or outside
31、 diameter of less than 1.4d are excluded from the mechanicalrequirements specified.The dimensional requirements of this British Standard are also applicable tonon-ferrous and stainless steel bolts, screws and nuts.Information on strength grade designation system for steel bolts and screws canbe foun
32、d in Annex A.NOTE 5 The range of nominal sizes included in this British Standard is likely to beadequate for most of the applications for which this series is likely to be employed,but for the convenience of users requiring larger sizes, further information inrelation to the derivation of tolerances
33、 is in Annex E.NOTE 6 In addition to the definitive requirements, this standard also requires theitems detailed in Clause 3 to be documented. For compliance with this standard,both the definitive requirements and the documented items have to be met.2 Normative referencesThe following documents, in w
34、hole or in part, are normatively referenced in thisdocument and are indispensable for its application. For dated references, onlythe edition cited applies. For undated references, the latest edition of thereferenced document (including any amendments) applies.BS 3643-1, ISO metric screw threads Part
35、 1: Principles and basic dataBS 3643-2, ISO metric screw threads Part 2: Specification for selected limits ofsizeBS EN ISO 898-1:2013, Mechanical properties of fasteners made of carbon steeland alloy steel Part 1: Bolts, screws and studs with specified property classes coarse thread and fine pitch t
36、hreadBS EN ISO 1234, Split pinsBRITISH STANDARD BS 3692:2014 The British Standards Institution 2014 1BS EN ISO 4042, Fasteners Electroplated coatingsBS EN ISO 4759-1:2001, Tolerances for fasteners Part 1: Bolts, screws, studs andnuts Product grades A, B and CBS EN ISO 6506-1, Metallic materials Brin
37、ell hardness test Part 1: Test methodBS EN ISO 6506-2, Metallic materials Brinell hardness test Part 2: Verificationand calibration of testing machinesBS EN ISO 6506-3, Metallic materials Brinell hardness test Part 3: Calibrationof reference blocksBS EN ISO 6506-4, Metallic materials Brinell hardnes
38、s test Part 4: Table ofhardness valuesBS EN ISO 6507-1, Metallic materials Vickers hardness test Part 1: Test methodBS EN ISO 6507-2, Metallic materials Vickers hardness test Part 2: Verificationand calibration of testing machinesBS EN ISO 6507-3, Metallic materials Vickers hardness test Part 3: Cal
39、ibrationof reference blocksBS EN ISO 6507-4, Metallic materials Vickers hardness test Part 4: Tables ofhardness valuesBS EN ISO 6508-1, Metallic materials Rockwell hardness test Test method(scales A, B, C, D, E, F, G, H, K, N, T)BS EN ISO 6508-2, Metallic materials Rockwell hardness test Verificatio
40、n andcalibration of testing machines (scales A, B, C, D, E, F, G, H, K, N, T)BS EN ISO 6508-3, Metallic materials Rockwell hardness test Calibration andreference blocks (scales A, B, C, D, E, F, G, H, K, N, T)BS EN ISO 10684, Fasteners Hot dipped galvanized coatingsBS ISO 965-5, ISO general purpose
41、metric screw threads Tolerances Limits ofsizes for internal screw threads to mate with hot-dip galvanized external screwthreads with maximum size of tolerance position h before galvanizing3 Information and requirements to be agreed anddocumented3.1 Information to be supplied by the purchaserThe foll
42、owing information to be supplied by the purchaser shall be fullydocumented.For compliance with the standard both the definitive requirements specifiedthroughout the standard and the following documented items shall be satisfied:a) general product description, i.e. “bolts”, “screws”, “nuts”, “slotted
43、 nuts”,etc., and material (if other than steel);b) the letter “M” indicating that the product is ISO metric;c) the nominal size (thread diameter) of the product in mm;d) the nominal length of bolts and screws in mm;e) the number of this British Standard e.g. BS 3692;f) the strength grade symbol;g) w
44、hether bolts with split pin holes are required (see 18.1);h) whether bolts, screws or nuts should be coated, and the type of coating tobe used (see Clause 19).BRITISH STANDARDBS 3692:20142 The British Standards Institution 2014EXAMPLEBolts 10 mm diameter, 50 mm long, manufactured from steel of stren
45、gthgrade 8.8, would be designated:“Bolts M10 50, 8.8 to BS 3692”.Nuts 12 mm in diameter, manufactured from steel of strength grade 6, zincplated, would be designated:“Nuts M12, 6 to BS 3692, zinc plated to BS EN ISO 4042”.3.2 Items to be agreed between the manufacturer and purchaserThe following ite
46、ms to be agreed between the contracting parties are specifiedin the clauses referred to and shall be fully documented. For compliance withthe standard both the definitive requirements specified throughout the standardand the following documented items shall be satisfied:a) the tolerances on screw th
47、reads (see 7.2);b) whether free cutting steel is to be used for the manufacture of nuts(see 16.2);c) minimum hardness values for nuts which are not proof load tested(see Clause 17).4 General dimensionsThe bolts, screws and nuts shall conform to the general dimensions given inTable 1, Table 3, Table
48、4, Table 5, and Table 6, and in Clause 5 to Clause 12.5 Length of bolts and screws5.1 Nominal lengthThe nominal length of a bolt or screw shall be the distance from the undersideof the head to the extreme end of the thread including any chamfer or radius.The standard nominal lengths shall be in acco
49、rdance with Table 1.NOTE Preferred nominal lengths of bolts and screws, in association with diameters,are given in Annex D.5.2 Tolerance on lengthThe tolerance on the nominal length shall in accordance with Table 1.BRITISH STANDARD BS 3692:2014 The British Standards Institution 2014 3Table 1 Tolerances on the standard nominal lengths of bolts and screwsDimensions in millimetresNominal length
