BRITISH STANDARD BS A 308 1994 ISO 9255 1993 Bolts, normal spline head, normal shank, short or medium length MJ threads, metallic material, coated or uncoated, strength classes less than or equal to 1[.]
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: 01 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BRITIS H S TAND ARD BS A 8: 994 IS O 92 5 : 993 Bolts, normal spline 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 UD C 62 882 : 62 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: 01 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS A 308:1994 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 90/79036 DC ISBN 580 23222 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: 01 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS A 308:1994 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: 01 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS A 308:1 994 National foreword This British Standard has been prepared under the direction of the Aerospace Standards Policy Committee It is identical with ISO 9255: 993 Bolts, no rm al s p line head, m etallic m aterial, to norm al shank, coated or uncoated, 00 MPa — Dim ensio ns, Aeros p ace — s hort o r m edium length MJ threads , s trength class es less than o r eq ual published by the International Organization for Standardization (ISO) Cross-references International Standard ISO 286- 2: 988 C orresponding British Standard BS EN 20286 Part 2: 992 ISO system of lim its and fits — Tab les of standard tolerance grades and lim it dev iations for holes and s hafts (Identical) ISO 3353: 992 BS 2A 231 : 993 Rolled threads for b olts Lead and runout req uirem ents (Identical) ISO 5855- 2: 988 BS 6293 Aeros p ace MJ threads Part 2: 994 Lim it dim ensions for b o lts and nuts (Identical) ISO 7403: 983 BS A 294: 984 configuration Sp ecification for s p line driv e w renching Metric series (Identical) 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: 33: 01 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS A 308:1994 Scope IS O 3 : 992 , Aero sp ace — Rolled threads fo r b olts — Lead and runout req uirem ents This International S tandard sp ecifies the dimensions of normal s p line head b olts , with clos e or large tolerance normal s hank, and s hort or IS O 85 - : 88, Aeros p ace — MJ threads — Part 2: Lim it dim ensions for b olts and nuts medium length MJ threads , in metallic material, IS O 7403 : 983 , Fasteners fo r aerosp ace coated or uncoated, with s trength class es less than construction — Sp line driv e w renching or equal to 1 00 MPa configuratio n — Metric series 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 ased 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 lim its and fits — Part 2: Tab les of standard to lerance grades and lim it deviatio ns for holes and s hafts © 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: 01 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS A 308:1994 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: 33: 01 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS A 308:1994 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 MJ12 × 1,25 – 4h6h 12 Diameter code H K h15 b tol large D2 — h12 b f7 b D4 D6 7,5 8,3 3,2 3,4 8,3 9,1 4,1 4,2 9,8 10,6 h12 b 4,9 5,2 –0,016 –0,041 L2 L3 Thread Thread 12,8 13,6 6,7 7,9 12 15,7 16,7 14 18,8 19,9 short medium 9,8 R1 nom tol S T +0,4 5,5 to 40 7,5 10 3,5 0,4 — 2,5 060 050 6,5 to 50 12 7,5 4,5 0,5 2,5 2,8 070 060 1,2 7,5 to 60 10 14 8,5 5,2 2,8 3,5 080 070 1,4 8,2 to 70 ± 0,2 11 15 9,5 5,9 0,7 3,3 3,8 090 080 1,6 8,6 to 80 11,5 16,5 7,5 10,5 6,3 3,7 3,9 100 100 10,1 to 100 14,5 20,5 13 7,7 0,8 4,7 4,2 120 120 2,4 11,4 to 120 16 14,5 8,8 0,9 5,6 4,5 140 22,5 10 –0,3 1,9 Wrenching dash number d 0,8 –0,2 1,1 1,6 2,4 040 D8 1,5 11,3 12,1 1,4 5,2 6,2 ± 0,5 10 P D7 min max H13 b H13 b tol –0,5 D5 –0,013 –0,038 short medium D3 large +0,5 nom close –0,010 –0,035 L1 c nom Table 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 7403 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: 33: 01 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: 33: 01 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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