BRITISH STANDARD BS A 304 1994 ISO 3203 1993 Bolts, normal bihexagonal head, normal or pitch diameter shank, long length MJ threads, metallic material, coated or uncoated, strength classes less than o[.]
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: 33: 02 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BRITIS H S TAND ARD BS A : 994 IS O 3 : 993 Bolts, normal b ihexagonal head, normal or pitch diameter shank, long 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: 33: 02 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS A 304:1994 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 Amendments issued since publication August 994 © BSI 01 - 2000 The following BSI references relate to the work on this standard: Committee reference ACE/1 Draft for comment 90/78994 DC ISBN 580 23218 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: 33: 02 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS A 304:1994 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: 33: 02 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS A 304:1 994 National foreword This British Standard has been prepared under the direction of the Aerospace Standards Policy Committee It is identical with ISO 3203: 993 Bolts, no rm al b ihexago nal head, MJ threads , eq ual to m etallic m aterial, Aeros p ace — no rm al or p itch diam eter shank, coated or uncoated, 00 MPa — Dim ens ions long length strength clas ses less than or , 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 s ystem of lim its and fits Tab les of standard tolerance grades and lim it dev iatio ns for holes and shafts (Identical) ISO 3353: 992 BS 2A 231 : 993 Rolled threads fo r b olts runout req uirem ents Lead and (Identical) ISO 5855- 2: 988 BS 6293 Aero sp ace — MJ threads Part 2: 994 Lim it dim ensions for b o lts 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 and 2, 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: 33: 02 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS A 304:1994 Scope Memb ers of IE C and IS O maintain regis ters of currently valid International S tandards This International S tandard sp ecifies the dimens ions of normal b ihexagonal head b olts , with normal or p itch diameter s hank, and long length MJ threads , in metallic material, coated or uncoated, IS O 86- : 88, ISO system of limits and fits — Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts Aerospace — Rolled threads for with s trength clas ses less than or equal IS O 3 : 992 , to 1 00 MPa bolts — Lead and runout requirements Fasteners for aerospace It is intended for the drawing up of aerosp ace IS O 40 95 : 978, p roduct s tandards construction — Bi-hexagonal wrenching configuration Normative references IS O 85 - : 88, The following s tandards contain p rovis ions which, through reference in this text, constitute p rovis ions 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 Aerospace — MJ threads — Part 2: Limit dimensions for bolts and nuts Configuration and dimensions S ee Figure and Tab le D imensions and tolerances are exp res s ed in millimetres They are agreements b ased on this International S tandard are encouraged to inves tigate the p os s ib ility of ap p licab le after any s urface coating, b ut b efore the ap p lication of any lub ricant ap p lying the mos t recent editions of the s tandards indicated b elow Figure © 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: 33: 02 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS A 304:1994 Table D1 Diameter code normal Thread a nom tol nom 040 MJ4 × 0,7 – 4h6h 3,54 050 060 070 080 100 120 MJ5 × 0,8 – 4h6h MJ6 × – 4h6h MJ7 × – 4h6h MJ8 × – 4h6h MJ10 × 1,25 – 4h6h 10 MJ12 × 1,25 – 4h6h 12 4,48 5,35 6,35 7,35 9,19 11,19 Diameter code H K L1 cde L2cde h15 b max 040 050 060 070 080 100 0,8 1,2 1,4 1,6 5,5 6,5 7,5 8,2 8,6 10,1 0,4 0,5 120 2,4 11,4 0,9 0,7 0,8 h12 b D2 pitch diameter L3 D3 +0,5 tol nom — 3,2 4,1 ± 0,13 4,9 5,2 6,7 L 4e nom D5 D6 –0,5 5,8 7,5 3,4 4,2 5,2 6,2 7,9 9,8 6,8 7,8 8,8 ± 0,5 9,8 11,8 13,7 8,3 9,8 11,3 12,8 15,7 18,8 R1 nom 14 16 18 20 22 26 16 to 56 20 to 70 22 to 84 24 to 98 ± 0,3 26 to 112 32 to 140 3,5 4,5 5,2 5,9 6,3 7,7 0,4 0,5 30 36 to 168 8,8 0,9 0,7 S tol +0,4 8,3 9,1 10,6 12,1 1,4 13,6 16,7 1,6 19,9 T Wrenching dash numberf –0,2 — 2,5 2,8 3,3 3,7 4,7 2,5 2,8 3,5 3,8 3,9 4,2 06 07 08 09 10 12 –0,3 5,6 4,5 14 0,8 D7 max H13 b tol P tol D4 a In conformity with ISO 5855-2 ISO 286-2 c First length, corresponding to first L length d Conditions L and L max cannot be obtained simultaneously e Increments: for L4 u 100 for L4 > 100 If greater lengths are required, they shall be chosen using these increments f In conformity with ISO 4095 over T b See © 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: 33: 02 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI List of references See national foreword © BSI 01 - 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