BS A 331-1998 Bolts reduced bihexagonal head normal or pitch diameter shank long length MJ threads metallic material coated or uncoated strength classes less than or equal to 1275 .pdf

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1、BRITISH STANDARD AEROSPACE SERIES BS A 331:1998 ISO 12258: 1998 Bolts, reduced bihexagonal head, normal or pitch diameter shank, long length MJ threads, metallic material, coated or uncoated, strength classes less than or equal to1275MPa Dimensions ICS 49.030.20BSA331:1998 This British Standard, hav

2、ing been prepared under the directionof the Engineering SectorBoard, was published underthe authority of the Standards Board and comes intoeffect on 15 September1998 BSI 05-1999 ISBN 0 580 30465 5 National foreword This British Standard reproduces verbatim ISO12258:1998 and implements it as the UK n

3、ational standard. The UK participation in its preparation was entrusted by Technical Committee ACE/12, Aerospace fasteners and fastening systems, to Subcommittee ACE/12/1, Aerospace fasteners and fastening systems (International), which has the responsibility to: aid enquirers to understand the text

4、; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommit

5、tee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by usi

6、ng the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity

7、 from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theISO title page, page ii, pages1 and 2 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in t

8、he amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSA331:1998 BSI 05-1999 i Contents Page National foreword Inside front cover Foreword ii 1 Scope 1 2 Normative references 1 3 Configuration and dimensions 1 Figure 1 1 Table 1 2ii blankBSA331:1998

9、 ii BSI 05-1999 Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subje

10、ct for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC

11、) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least75% of the member bodies casting a vote. International Standar

12、d ISO12258 was prepared by Technical Committee ISO/TC20, Air craft and space vehicles, Subcommittee SC 4, Aerospace fastener systems. Descriptors: Aircraft industry, fasteners, MJ threads, bolts, form specifications, dimensions.BSA331:1998 BSI 05-1999 1 1 Scope This International Standard specifies

13、the dimensions of reduced bihexagonal head bolts, with normal or pitch diameter shank and long length MJ threads, in metallic material, coated or uncoated, of strength classes less than or equal to1275MPa. This International Standard is applicable for the compilation of aerospace product standards.

14、2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this

15、 International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 3353:1992, Aerospace Rolled threads for bolts Lead and runout require

16、ments. ISO 4095:1998, Aerospace Bi-hexagonal drives Wrenching configuration Metric series. ISO 5855-2:1988, Aerospace MJ threads Part2: Limit dimensions for bolts and nuts. ISO 7913:1994, Aerospace Bolts and screws, metric Tolerances of form and position. 3 Configuration and dimensions SeeFigure 1 a

17、ndTable 1. Dimensions and tolerances are expressed in millimetres. They are applicable after any surface coating, but before the application of any lubricant. Tolerances of form and position are specified in ISO7913. Figure 1 BSA331:1998 2 BSI 05-1999 Table 1 D 1 D 2 D 3 D 4 D 5 D 6 E Diameter code

18、Thread a Normal Pitch diameter nom. tol. nom. tol. min. 0,5 min. max. h15 050 MJ5 0,8 4h6h 5 4,48 6,8 3,2 3,4 8,3 9,1 5,5 060 MJ6 1 4h6h 6 5,35 7,8 4,1 4,2 9,8 10,6 6 070 MJ7 1 4h6h 7 h12 6,35 0,13 8,8 4,9 5,2 11,3 12,1 6,5 080 MJ8 1 4h6h 8 7,35 9,8 5,2 6,2 12,8 13,6 7 100 MJ10 1,25 4h6h 10 9,19 11,

19、8 6,7 7,9 15,7 16,7 8 120 MJ12 1,25 4h6h 12 11,19 13,7 8 9,8 18,8 19,9 9,2 Diameter code F G H L 1 bcd L 2 bcd L 3 L 4 c R Wrenching dash number e min. min. min. max. 0,3 nom. tol. 050 2,5 2 1 0,5 16 20 to 70 0,5 07 060 2,8 2,3 1,2 4 18 22 to 84 08 070 3,3 2,6 1,4 0,7 20 24 to 98 0,7 09 080 3,7 2,8

20、1,6 22 26 to 112 10 100 4,7 3,1 2 0,8 6 26 32 to 140 0,8 12 120 5,6 3,5 2,4 0,9 30 36 to 168 0,9 14 a In accordance with ISO5855-2. b First length corresponding to first L 4length. c In order to provide a manufacturing tolerance, the distance L 2max. L 1min. will be greater than the thread runout le

21、ngth specified in ISO3353. d Increments: 2 for L 4100 If greater lengths are necessary, they shall be chosen using these increments. e In accordance with ISO4095 over G min. +0,5 0 +0,4 0 0 0,2 0 0,3 blankBS A 331:1998 ISO 12258: 1998 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInsti

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