BRITISH STANDARD BS A 303 1994 ISO 3185 1993 Bolts, normal bihexagonal head, normal shank, short or medium length MJ threads, metallic material, coated or uncoated, strength classes less than or equal[.]
Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 03: 32: 47 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BRITIS H S TAND ARD BS A 3 : 994 IS O 85 : 993 Bolts, normal b ihexagonal head, normal shank, short or medium length MJ threads, metallic material, coated or uncoated, strength classes less than or equal to 1 0 MPa — D imensions Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 03: 32: 47 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS A 303:1994 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Aerospace Standards Policy Committee (ACE/- ) to Technical Committee ACE/1 2, upon which the following bodies were represented: The Association of Electronics, Telecommunications and Business Equipment Industries British Industrial Fasteners Federation Ministry of Defence Society of British Aerospace Companies Ltd This British Standard, having been prepared under the direction of the Aerospace Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on August 994 © BSI 01 - 2000 The following BSI references relate to the work on this standard: Committee reference ACE/1 Draft for comment 90/79568 DC ISBN 580 23217 Amendments issued since publication Amd No Date Comments Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 03: 32: 47 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS A 303:1994 Contents Page Committees responsib le National foreword ii Scope Normative references C onfiguration and dimensions Figure Table List of references © BSI 01 - 000 Inside front cover Inside back cover i Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 03: 32: 47 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS A 303:1 994 National foreword This British Standard has been prepared under the direction of the Aerospace Standards Policy Committee It is identical with ISO 31 85: 993 Bolts, no rm al b ihexago nal head, norm al shank, Aero sp ace — s hort o r m edium length MJ threads, m etallic m aterial, coated o r unco ated, strength class es less than or eq ual to 1 00 MPa — Dim ens ions , published by the International Organization for Standardization (ISO) Cross-references International Standard Corresponding British Standard ISO 286- 2: 988 BS EN 20286 Part 2: 992 ISO sys tem of lim its and fits Tab les o f standard tolerance grades and lim it dev iatio ns fo r ho les and shafts (Identical) ISO 3353: 992 BS 2A 231 : 993 Ro lled threads for b o lts Lead and runout req uirem ents (identical) ISO 5855- 2: 988 BS 6293 Aero sp ace — MJ threads Part 2: 994 Lim it dim ensions fo r b olts and nuts (Identical) The Technical Committee has reviewed the provisions of ISO 4095: 978, to which normative reference is made in the text, and has decided that they are acceptable for use in conj unction 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 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 to 4, 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 ii © BSI 01 - 2000 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 03: 32: 47 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS A 303:1994 Scope IS O 3 : 992 , Aerospace — Rolled threads for bolts — Lead and runout requirements This International S tandard sp ecifies the dimens ions of normal b ihexagonal head b olts , with clos e or large tolerance normal shank, and s hort or medium length MJ threads , in metallic material, IS O 40 95 : 978, Fasteners for aerospace construction — Bi-hexagonal wrenching configuration Aerospace — MJ threads — coated or uncoated, with s trength class es less than IS O 85 - : 88, or equal to 1 00 MPa Part 2: Limit dimensions for bolts and nuts It is intended for the drawing up of aerosp ace p roduct s tandards Configuration and dimensions Normative references tolerances are exp res s ed in millimetres They are The following s tandards contain p rovis ions which, through reference in this text, constitute p rovis ions S ee Figure and Tab le D imens ions and ap p licab le after any s urface coating, b ut b efore the ap p lication of any lub ricant of this International S tandard At the time of p ub lication, the editions indicated were valid All s tandards are sub j ect to revis ion, and p arties to agreements b as ed on this International S tandard are encouraged to inves tigate the p os s ib ility of ap p lying the mos t recent editions of the s tandards indicated b elow Memb ers of IE C and IS O maintain regis ters of currently valid International S tandards IS O 86- : 988, ISO system of limits and fits — Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts © BS I - 00 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 03: 32: 47 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS A 303:1994 Figure © BSI 01 - 000 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 03: 32: 47 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS A 303:1994 Table D1 Diameter code Thread a Coated bolts Uncoated bolts tol tol nom close 040 MJ4 × 0,7 – 4h6h 050 MJ5 × 0,8 – 4h6h 060 MJ6 × – 4h6h 070 MJ7 × – 4h6h 080 MJ8 × – 4h6h 100 MJ10 × 1,25 – 4h6h 10 120 h12 b f7 b Diameter code H K h15b nom tol nom D4 D5 D6 tol min –0,5 5,8 7,5 8,3 9,1 3,2 3,4 6,8 8,3 4,1 4,2 7,8 9,8 10,6 h12 b 4,9 5,2 5,2 6,2 6,7 7,9 11,8 15,7 16,7 9,8 13,7 18,8 19,9 L2 L3 Thread Thread short medium short medium tol S T +0,4 5,5 to 40 7,5 10 3,5 0,4 — 2,5 06 050 6,5 to 50 12 7,5 4,5 0,5 2,5 2,8 07 060 1,2 7,5 to 60 10 14 8,5 5,2 2,8 3,5 08 070 1,4 8,2 to 70 ± 0,2 11 15 9,5 5,9 0,7 3,3 3,8 09 080 1,6 8,6 to 80 11,5 16,5 7,5 10,5 6,3 3,7 3,9 10 100 10,1 to 100 14,5 20,5 13 7,7 0,8 4,7 4,2 12 120 2,4 11,4 to 120 16 22,5 10 14,5 8,8 0,9 5,6 4,5 14 –0,3 1,9 Wrenching dash numberd 0,8 –0,2 1,1 1,6 2,4 040 D8 1,5 9,8 12,8 13,6 R1 nom 8,8 11,3 12,1 1,4 ± 0,5 P D7 max H13 b H13 b – 0,016 – 0,041 L1 c D3 — – 0,013 – 0,038 MJ12 × 1,25 – 4h6h 12 +0,5 large close large – 0,010 – 0,035 D2 conformity with ISO 5855-2, except for the maximum major diameter “d” of bolts with a close tolerance on D1 , which shall be equal to D1 – 0,025 b See ISO 286-2 c Increments: for L1 u 30 for 30 < L1 u 100 for L1 > 100 If greater lengths are required, they shall be chosen using these increments d In conformity with ISO 4095 over T a In © BSI 01-2000 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 03: 32: 47 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI blank Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 03: 32: 47 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI List of references See national foreword © BSI 01 - 000 BS A 303:1994 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 03: 32: 47 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS A 303:1994 ISO 3185:1993 BSI — British Standards Institution BS I is the indep endent national b ody res p ons ib le for p rep aring Britis h S tandards It p res ents the UK view on s tandards in E urop e and at the international level It is incorp orated b y Royal C harter Revisions Britis h S tandards are up dated b y amendment or revis ion Us ers of Britis h S tandards should make s ure that they p oss es s the latest amendments or editions It is the constant aim of BS I to imp rove the quality of our p roducts and services We would b e grateful if anyone finding an inaccuracy or amb iguity while us ing this Britis h S tandard would inform the S ecretary of the technical committee res p ons ib le, the identity of which can b e found on the inside front cover Tel: 02 89 96 90 00 Fax: 02 89 96 40 BS I offers memb ers an individual up dating s ervice called PLUS which ens ures that s ub s crib ers automatically receive the lates t editions of s tandards Buying standards O rders for all BS I, international and foreign s tandards p ub lications s hould b e addres s ed to C us tomer S ervices Tel: 899 00 Fax: 899 7001 In res p ons e to orders for international standards , it is BS I p olicy to sup p ly the BS I imp lementation of thos e that have b een p ub lis hed as Britis h S tandards, unless otherwis e requested Information on standards BS I p rovides a wide range of information on national, E urop ean and international standards through its Lib rary and its Technical H elp to E xp orters S ervice Various BS I electronic information s ervices are also availab le which give details on all its p roducts and s ervices C ontact the Information C entre Tel: 02 89 96 71 1 Fax: 02 89 96 048 S ub s crib ing memb ers of BS I are kep t up to date with s tandards develop ments and receive sub s tantial discounts on the p urchase p rice of s tandards For details of thes e and other b enefits contact Memb ership Adminis tration Tel: 02 89 96 70 02 Fax: 02 89 96 00 Copyright C op yright s ub s is ts in all BS I p ub lications BS I als o holds the cop yright, in the UK, of the p ub lications of the international s tandardization b odies E xcep t as p ermitted under the C op yright, D es igns and Patents Act 988 no extract may b e rep roduced, s tored in a retrieval s ystem or transmitted in any form or b y any means – electronic, p hotocop ying, recording or otherwis e – without p rior written p ermis s ion from BS I This does not p reclude the free us e, in the cours e of imp lementing the standard, of necess ary details such as s ymb ols, and size, typ e or grade designations If thes e details are to b e used for any other p urp os e than imp lementation then the p rior written p ermiss ion of BS I must b e ob tained If p ermis sion is granted, the terms may include royalty p ayments or a licensing agreement D etails and advice can b e ob tained from the C op yright Manager BS I 89 C his wick H igh Road London W4 4AL Tel: 02 89 96 70