1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS 7419:2012Specification for holdingdown boltsPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the documentwas last issued.
2、 The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 77919 0ICS 21.060.10The following BSI references relate to the work on this document:Committee reference FME/9Draft for comment 12/30258706/DCPublication historyFirst edition, March 1991Second (present) edit
3、ion, December 2012Amendments issued since publicationDate Text affectedBS 7419:2012 BRITISH STANDARDContentsForeword ii1 Scope 12 Normative references 13 Dimensions 24 Characteristics 75 Complete designation for the purpose of an enquiry or order 7Bibliography 10List of figuresFigure 1 Dimensions of
4、 square head bolts 4Figure 2 Dimensions of hexagon head bolts 6List of tablesTable 1 Dimensions of square head bolts 3Table 2 Dimensions of hexagon head bolts 5Table3Tolerance on nominal length 7Table 4 Preferred sizes 7Table 5 Characteristics 8Table 6 Recommended bolt and nut combinations 8Summary
5、of pagesThis document comprises a front cover, an inside front cover, pages i to ii,pages 1 to 10, an inside back cover and a back cover.BRITISH STANDARD BS 7419:2012 The British Standards Institution 2012 iForewordPublishing informationThis British Standard is published by BSI Standards Limited, un
6、der licence fromThe British Standards Institution, and came into effect on 31 December 2012. Itwas prepared by Technical Committee FME/9, Fasteners. A list of organizationsrepresented on this committee can be obtained on request to its secretary.SupersessionThis British Standard supersedes BS 7419:1
7、991, which is withdrawn.Information about this documentThe fasteners in this British Standard are used in the steel construction industry,where their use might be subject to the requirements of the ConstructionProducts Regulation. BS EN 15048 has been written to provide theharmonization requirements
8、 for non-preloaded structural fasteners, and givesdetails of CE marking. Assemblies produced in accordance with BS 7419 can beexpected to meet the mechanical property requirements of BS EN 15048.Requirements in this standard are drafted in accordance with The BSI guide tostandardization Section 2: R
9、ules for the structure, drafting and presentation ofBritish Standards, subclause 11.3.1, which states, “Requirements should beexpressed using wording such as: When tested as described in Annex A, theproduct shall .”. This means that only those products that are capable ofpassing the specified test w
10、ill be deemed to conform to this standard.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 prese
11、nted insmaller italic type, and does not constitute a normative element.Contractual and legal considerationsThis publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immun
12、ity from legalobligations.BRITISH STANDARDBS 7419:2012ii The British Standards Institution 20121 ScopeThis British Standard specifies the characteristics of holding down bolts withthreads from M16 up to and including M64 of product grade C for use inconnecting steel structures to their foundations a
13、nd in similar applications.Bolts with square heads and square necks are specified. Two possible forms ofsquare neck are covered.Bolts with hexagon heads are also specified.Other forms of holding down bolts are not covered.Holding down bolts are used with hexagon nuts in accordance withBS EN ISO 4032
14、:2001 or BS EN ISO 4034:2001 and may, be used with washers inaccordance with BS EN ISO 7091:2000, or alternatively, washers in accordancewith BS 4320:1968, Form G may be specified.2 Normative referencesThe following referenced documents are indispensable for the application ofthis document. For date
15、d references, only the edition cited applies. For undatedreferences, the latest edition of the referenced document (including anyamendments) applies.BS 3643-1:2007, ISO metric screw threads Part 1: Principles and basic dataBS 3643-2:2007, ISO metric screw threads Part 2: Specification for selectedli
16、mits of size.BS 4320:1968, Metal Washers for general engineering purposes Metric seriesBS 7371-8:2011, Coatings on metal fasteners Part 8: Specification forsherardized coatingsBS EN 15048-2:2007, Non-preloaded structural bolting assemblies Part 2: Suitability testBS EN ISO 898-1:2009, Mechanical pro
17、perties of fasteners made of carbon steeland alloy steel Part 1: Bolts, screws and studs with specified property classes Coarse thread and fine pitch threadBS EN ISO 898-2:2012, Mechanical properties of fasteners made of carbon steeland alloy steel Part 2: Nuts with specified property classes Coarse
18、 thread andfine pitch threadBS EN ISO 3269:2001, Fasteners Acceptance inspectionBS EN ISO 4032:2001, Hexagon nuts, style 1 Product grades A and BBS EN ISO 4034:2001, Hexagon nuts Product grade CBS EN ISO 4042:2000, Fasteners Electroplated coatingsBS EN ISO 4759-1:2001, Tolerances for fasteners Part
19、1: Bolts, screws, studs andnuts Product grades A, B and CBS EN ISO 7091:2000, Plain washers Normal series Product Grade CBS EN ISO 10684:2004, Fasteners Hot dip galvanized coatingsBS ISO 965-5:1998, ISO General purpose metric screw threads Tolerances Part 5: Limits of sizes for internal screw thread
20、s to mate with hot-dip galvanizedexternal screw threads with maximum size of tolerance position h beforegalvanizingBS ISO 8992:2005, Fasteners General requirements for bolts, screws, studs andnutsBRITISH STANDARD BS 7419:2012 The British Standards Institution 2012 13 DimensionsThe general dimensions
21、 and tolerances of holding down bolts with square headsand square necks shall be as given in Table 1, Table 3 and Figure 1.The dimensions and tolerances of holding down bolts with hexagon heads shallbe as given in Table 2, Table 3 and Figure 2.NOTE 1 Preferred sizes for square and hexagon head holdi
22、ng down bolts are listedin Table 4.NOTE 2 Symbols and descriptions of dimensions are in BS EN ISO 225:2010.BRITISH STANDARDBS 7419:20122 The British Standards Institution 2012Table1DimensionsofsquareheadboltsThread(d)M16M20M24M30M36M42M48M56M64mmmmmmmmmmmmmmmmmmP(pitch)22.533.544.555.56b max.122127.
23、5133140.5148155.5163172.5182min.116120124130136142148156164dsmax.16.720.8424.8430.8437434957.265.2min.15.319.1623.1629.1635414754.862.8k nom.1012.51518.722.526303540min.9.2511.614.117.6521.4524.9528.9533.7538.75max.10.7513.415.919.7523.5527.0531.0536.2541.25r min.0.60.80.8111.21.622s nom.=max2430364
24、65565758595min.23.1629.16354553.863.173.182.892.8f nom.81012151821242832min.7.259.2511.114.117.119.9522.9526.9530.75max.8.7510.7512.915.918.922.0525.0529.0533.25v max.16.720.8424.8430.8437434957.265.2min.15.319.1623.1629.1635414754.862.8x max.56.37.59101112.51415BRITISH STANDARD BS 7419:2012 The Bri
25、tish Standards Institution 2012 3Figure1Dimensionsofsquareheadbolts1)Incompletethreadsu2p.Key 1Endwithoutspecialrequirements2AlternativeheadformBRITISH STANDARDBS 7419:20124 The British Standards Institution 2012Table2DimensionsofhexagonheadboltsThread(d)M16M20M24M30M36M42M48M56M64mmmmmmmmmmmmmmmmmm
26、P(pitch)22.533.544.555.56b max.122127.5133140.5148155.5163172.5182min.116120124130136142148156164c max.0.80.80.80.80.81111damax.18.724.428.435.442.448.656.66775dsmax.16.720.8424.8430.8437434957.265.2min.15.319.1623.1629.1635414754.862.8dwmin.2227.733.2542.7551.1159.9569.4578.6688.16e min.26.1732.953
27、9.5550.8560.7971.382.693.56104.86k nom.1012.51518.722.526303540min.9.2511.614.117.6521.4524.9528.9533.7538.75max.10.7513.415.919.7523.5527.0531.0536.2541.25r min.0.60.80.8111.21.622s nom.=max.243036465565758595min.23.1629.16354553.863.173.182.892.8x max.56.37.59101112.51415BRITISH STANDARD BS 7419:2
28、012 The British Standards Institution 2012 5Figure2Dimensionsofhexagonheadbolts1)Incompletethreadsu2p.Key 1Endwithoutspecialrequirements3Alternativeheadformwithwasherface2ReferencedatumfordwBRITISH STANDARDBS 7419:20126 The British Standards Institution 2012Table 3 Tolerance on nominal lengthNominal
29、 length Tolerancemm mm250 39mm: as agreedB)Standard BS EN ISO 898-1:2009Tolerance Product grade CStandard BS EN ISO 4759-1:2001Finish - CoatingNormal As processedC)Hot dipgalvanizedBS EN ISO 10684:2004Sherardized BS 7371-8Zinc electroplated BS EN ISO 4042:2000Others To be agreedD)Associated nutsStan
30、dards BS EN ISO 4032:2001 and BS EN ISO 4034:2001Property classes 5, 8, 10E)Standard BS EN ISO 898-2:2012Thread tolerance 6H, 7H or 6AZStandards BS 3643-2:2007 or BS ISO 965-5:1998Associated washers(if required)Standards BS EN ISO 7091:2000 or BS 4320:1968 Form GOthers to be agreedF)Acceptability St
31、andard BS EN ISO 3269:2001Suitability test Standard BS EN 15048-2:2007A)The tolerance class specified applies before hot dip galvanizing or coating with any thick protective coating.B)The designation symbol for the property classes according to BS EN ISO 898-1:2009 may also be used for threadsizes a
32、bove M39, provided that the finished product has all the properties assigned to the designation symbols inBS EN ISO 898-1:2009.C)As processed means the normal finish resulting from manufacture with a light oil coating.D)Other coatings may be negotiated between the purchaser and the manufacturer prov
33、ided they do not impair themechanical properties or the functional characteristics. Coatings of cadmium or cadmium alloy are not permitted.E)Recommended bolt and nut combinations are shown in Table 6.F)Other washers may be supplied by agreement between the purchaser and the manufacturer.Table 6 Reco
34、mmended bolt and nut combinationsBolt property class 4.6 4.6A)8.8 8.8A)BRITISH STANDARDBS 7419:20128 The British Standards Institution 2012Table 6 Recommended bolt and nut combinationsRecommended nut propertyclass5B)8 or 10 8 or 10 10A)When a thick protective coating such as hot dip galvanizing or s
35、herardizing is applied,which requires the nut thread to be tapped oversize to 6AZ, higher property class nutsshall be used to meet the loadability requirements of BS EN 15048-2007.B)Nuts of higher property class may also be used.BRITISH STANDARD BS 7419:2012 The British Standards Institution 2012 9B
36、ibliographyStandards publicationsFor dated references, only the edition cited applies. For undated references, thelatest edition of the referenced document (including any amendments) applies.BS EN ISO 225:2010, Fasteners Bolts, screws, studs and nuts Symbols anddescriptions of dimensionsBRITISH STAN
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