1、BRITISH STANDARD BS A304:1994 ISO3203:1993 Bolts, normal bihexagonal head, normal or pitch diameter shank, long length MJ threads, metallic material, coated or uncoated, strength classes less than or equal to1100MPa DimensionsBSA 304:1994 This BritishStandard, having been prepared under the directio
2、nof the Aerospace Standards Policy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 15August1994 BSI 01-2000 The following BSI references relate to the work on this standard: Committee referenceACE/12 Draft for comment90/78994DC ISBN 0 580 23218 2 Committees
3、responsible for this BritishStandard The preparation of this BritishStandard was entrusted by the Aerospace Standards Policy Committee(ACE/-) to Technical CommitteeACE/12, upon which the following bodies were represented: The Association of Electronics, Telecommunications and Business Equipment Indu
4、stries British Industrial Fasteners Federation Ministry of Defence Society of British Aerospace Companies Ltd. Amendments issued since publication Amd. No. Date CommentsBSA 304:1994 BSI 01-2000 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope 1 2 Normative refer
5、ences 1 3 Configuration and dimensions 1 Figure 1 1 Table 1 2 List of references Inside back coverBSA 304:1994 ii BSI 01-2000 National foreword This BritishStandard has been prepared under the direction of the Aerospace Standards Policy Committee. It is identical with ISO3203:1993 Aerospace Bolts, n
6、ormal bihexagonal head, normal or pitch diameter shank, long length MJthreads, metallic material, coated or uncoated, strength classes less than or equal to1100MPa Dimensions, published by the International Organization for Standardization(ISO). The Technical Committee has reviewed the provisions of
7、 ISO4095:1978, to which normative reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct
8、 application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International Standard Corresponding BritishStandard ISO286-2:1988 BS EN20286 ISO system of limits and fits Part2:1992 Tables of standard tolerance grades and limit deviations
9、 for holes and shafts (Identical) ISO3353:1992 BS2A231:1993 Rolled threads for bolts. Lead and runout requirements. (Identical) ISO5855-2:1988 BS6293 Aerospace MJ threads Part2:1994 Limit dimensions for bolts and nuts (Identical) Summary of pages This document comprises a front cover, an inside fron
10、t cover, pagesi andii, pages1 and2, an inside back cover 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.BSA 304:1994 BSI 01-2000 1 1 Scope This International Stand
11、ard specifies the dimensions of normal bihexagonal head bolts, with normal or pitch diameter shank, and long length MJ threads, in metallic material, coated or uncoated, with strength classes less than or equal to1100MPa. It is intended for the drawing up of aerospace product standards. 2 Normative
12、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 Internation
13、al 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. ISO286-2:1988, ISO system of limits and fits Part2: Tables of standard tolerance grad
14、es and limit deviations for holes and shafts. ISO3353:1992, Aerospace Rolled threads for bolts Lead and runout requirements. ISO4095:1978, Fasteners for aerospace construction Bi-hexagonal wrenching configuration. ISO5855-2:1988, Aerospace MJ threads Part2: Limit dimensions for bolts and nuts. 3 Con
15、figuration and dimensions SeeFigure 1 andTable 1. Dimensions and tolerances are expressed in millimetres. They are applicable after any surface coating, but before the application of any lubricant. Figure 1 BSA 304:1994 2 BSI 01-2000 Table 1 Diameter code Thread a D 1 D 2 D 3 D 4 D 5 D 6 D 7 normal
16、pitch diameter nom. tol. nom. tol. nom. tol. min. min. max. H13 b 040 MJ4 0,74h6h 4 h12 b 3,54 0,13 3 5,8 7,5 8,3 1 050 MJ5 0,84h6h 5 4,48 3,2 3,4 0,5 6,8 8,3 9,1 060 MJ6 14h6h 6 5,35 4,1 4,2 7,8 9,8 10,6 1,4 070 MJ7 14h6h 7 6,35 4,9 5,2 8,8 11,3 12,1 080 MJ8 14h6h 8 7,35 5,2 6,2 9,8 12,8 13,6 100 M
17、J10 1,254h6h 10 9,19 6,7 7,9 11,8 15,7 16,7 1,6 120 MJ12 1,254h6h 12 11,19 8 9,8 13,7 18,8 19,9 Diameter code H K L 1 cde L 2 cde L 3 L 4 e P R 1 S T Wrenching dash number f min. h15 b min. max. nom. tol. nom. tol. min. 040 0,8 5,5 0,4 2 14 16 to56 0,3 3,5 0,4 2,5 06 050 1 6,5 0,5 4 16 20 to70 4,5 0
18、,5 2,5 2,8 07 060 1,2 7,5 0,7 18 22 to84 5,2 0,7 2,8 3,5 08 070 1,4 8,2 20 24 to98 5,9 3,3 3,8 09 080 1,6 8,6 22 26 to112 6,3 3,7 3,9 10 100 2 10,1 0,8 6 26 32 to140 7,7 0,8 4,7 4,2 12 120 2,4 11,4 0,9 30 36 to168 8,8 0,9 5,6 4,5 14 a In conformity with ISO5855-2. b SeeISO286-2. c First length, corr
19、esponding to first L 4length. d Conditions L 1 min. and L 2 max. cannot be obtained simultaneously. e Increments: 2 for L 4 u 100 4 for L 4 100 If greater lengths are required, they shall be chosen using these increments. f In conformity with ISO4095 over T min. +0,5 0 0 0,5 +0,4 0 0 0,2 0 0,3BSA304
20、:1994 BSI 01-2000 List of references Seenational foreword.BS A304:1994 ISO3203:1993 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the inter
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