BRITISH STANDARD AEROSPACE SERIES BS 4A 102 2002 Specification for steel bolts (Unified hexagons and Unified threads) for aircraft ICS 49 030 20 +A1 2006 Incorporating Corrigendum No 1 Li ce ns ed C o[.]
Licensed Copy: Ms Mary Groom, British Standards Institution, 24/05/2012 13:46, Uncontrolled Copy, (c) The British Standards Institution 2012 BRITISH STANDARD AEROSPACE SERIES BS 4A 4A 102:2002 102:2002 BS +A2:2012 +A1:2006 Incorporating Corrigendum No Specification for steel bolts (Unified hexagons and Unified threads) for aircraft ICS 49.030.20 Licensed Copy: Ms Mary Groom, British Standards Institution, 24/05/2012 13:46, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 4A 102:2002 102:2002+A2:2012 +A1:2006 BS Committees responsible for this British Standard The preparation The preparation of of this this British British Standard Standard was was entrusted entrusted to to Technical Technical Committee ACE/12, Committee ACE/12, Aerospace Aerospace fasteners fastenersand andfastening, fastening,upon uponwhich whichthe the following bodies following bodies were were represented: represented: Civil Aviation Authority (Airworthiness Division) Confederation of British Forgers Institute of Petroleum Ministry of Defence Society of British Aerospace Companies Ltd This This British British Standard, Standard, having having been been prepared prepared under under the the direction direction of of the the Engineering Engineering Sector Sector Policy Policy and and Strategy Strategy Committee, Committee, was was published published under under the the authority authority of of the Standards Policy and Strategy the Standards Policy Committee onCommittee 28 January 2002 and Strategy on 28 January 2002 © BSI 2009 © The British Standards Institution 2012 Published by BSI Standards Limited 2012 The following following BSI BSI references references The relate to to the the work work on on this this relate standard: standard: Committee reference reference ACE/12 ACE/12 Committee Draftsfor forcomment comment00/704897 DC Draft 00/704897 DC, 12/30264056 DC ISBN 580 79097 6900036 ISBN 978 978 00 580 Amendments issued since publication Amendments issued since publication Amd No Amd No 16374 16374 Date Date June 2006 June 2006 Comments Comments Corrections to Table Corrections to Table C1 C1 October 2009 2009 Correction to Table October A2 November 2012 See Foreword Licensed Copy: Ms Mary Groom, British Standards Institution, 24/05/2012 13:46, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 4A 102:2002+A2:2012 102:2002+A1:2006 BS Contents Committees responsible Foreword 10 Page Inside front cover ii Scope Normative references General requirements Materials and manufacture Dimensions and tolerances Screw threads Protective finish Anti-corrosion treatment Hardness values Identification and marking Quality assurance procedure 1 1 2 2 Table — Materials for manufacture of bolts Table — Dimensions of bolts Table — Bearing length L, clamping length M and overall length E Figure — Dimensions of bolts (see Table 2) Figure — Bearing length L, clamping length M and overall length E (see Table 3) © BSI The 2009 British Standards Institution 2012 © ii Copy: Licensed Ms Mary Copy: Groom, Ms Mary Licensed British Groom, Standards Copy: British MsInstitution, Standards Mary Groom, 24/05/2012 Institution, British Standards 13:46, 24/05/2012 Uncontrolled Institution, 13:46, Uncontrolled Copy, 24/05/2012 (c) The Copy, 13:46, British (c) Uncontrolled Standards The BritishInstitution Copy, Standards (c) 2012 The Institution British Standards 2012 Institution 2012 BS BS 4A 4A 102:2002+A1:2006 102:2002+A2:2012 Foreword This British British Standard Standard has is published by BSIbyStandards under licence This been prepared Technical Limited, Committee ACE/12 It is a from TheofBritish Institution revision BS 3A Standards 102:1962 which is superseded and withdrawn BS 4A 102:2002+A1:2006 BS 4A 102:2002+A2:2012 4A 102:2002+A1:2006, which is This revision of BS 3A 102 supersedes refers to theBS relevant requirements in BS A 100 withdrawn It incorporates amendments 1, 2, and of BS 3A 102 and updates and revises material specifications Text introduced or altered by Amendment No is indicated in the text by tags Foreword NOTE manufactured to previous of this Previous specificationamendments may continue toare be supplied .Fasteners Minor editorial changes are editions not tagged not BS 4A 102:2002+A1:2006 until stocks are exhausted indicated T his British publication does not to include all the necessary provisions This Standard haspurport been prepared by Technical Committee ACE/12.ofIta is a ts correct application contract Users are responsible for i revision of BS 3A 102:1962 which is superseded and withdrawn Compliance with a British Standard cannot confer immunity This revision of BS 3A 102 refers to the relevant requirements in BS A from 100 legal obligations It incorporates amendments 1, 2, and of BS 3A 102 and updates and revises Foreword material specifications This British Standard has been prepared by Technical Committee ACE/12 It is a NOTE Fasteners manufactured previous of this specification may continue to be supplied revision of BS 3A 102:1962towhich iseditions superseded and withdrawn until stocks are exhausted This revision of BS 3A 102 refers to the relevant requirements in BS A 100 T his publication does purport include alla 3A the necessary provisions of abeen BSamendments A 102not bolts have plating material which ItCAUTION incorporates 1, 2, cadmium 3toand ofas BS 102 and updates andhas revises ts correct application contract Users are responsible for i restricted and/or banned for use in many countries owing to environmental and material specifications health concerns; they should not be used in new product designs Local officials Compliance a British Standard annot confer immunity NOTE Fastenerswith manufactured previous editionscof this specification may continue from to be supplied should beare consulted abouttoany concerns on the use of cadmium-plated parts legal obligations until stocks exhausted This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application Compliance with a British Standard cannot confer immunity from legal obligations Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages to 16, an inside back cover and a back cover The BSI copyright notice displayed in this document indicates when the document was last issued ii Summary of pages © The British Standards Institution © BSI2012 2009 This document comprises a front cover, an inside front cover, pages i and ii, pages to 16, an inside back cover and a back cover Licensed Copy: Licensed Ms Mary Copy: Groom, Ms Mary BritishGroom, Standards British Institution, Standards 24/05/2012 Institution,13:46, 24/05/2012 Uncontrolled 13:46, Copy, Uncontrolled (c) TheCopy, British(c) Standards The British Institution Standards 2012 Institution 2012 BS 4A 4A 102:2002+A2:2012 102:2002+A1:2006 BS BS 4A 102:2002+A1:2006 Scope This British British Standard Standard specifies specifies materials materials and and manufacture, manufacture, dimensions, dimensions, protective protective treatment treatment and and quality quality This assurance requirements requirements for plated, assurance for steel steel hexagon-head hexagon-head bolts bolts with with unified unified threads threads , and cadmium a tensile strength of and a tensile080 strength 880/1 MPa of 880/1 080 MPa NOTE The latest edition of an Aerospace Series standard is indicated by a prefix number Scope Normative references This British Standard specifies materials and manufacture, dimensions, protective treatment and quality assurance requirements steel hexagon-head bolts with unified threads and a tensile of The normative for documents contain provisions provisions which, through reference in this this strength text, constitute constitute The following following normative documents contain which, through reference in text, 880/1 080 MPa provisions of For dated references, subsequent subsequent amendments amendments to, to, or or revisions revisions of, of, any provisions of this this British British Standard Standard For dated references, of these publications not apply For undated references, latest edition of the referred to any of these publications not apply For undated references, thenumber latest edition of publication the publication NOTE The latest edition of an Aerospace Series standard is indicated bythe a prefix referred to applies applies Normative references BS 3A 4A 100:1991, Specification for general requirements for bolts free running nuts ofnuts tensile strength BS 100:2003, Specification for general requirements forand bolts and free running of tensile The following documents strength not exceeding 249 MPa contain provisions which, through reference in this text, constitute not exceeding 1normative 249 MPa provisions of this Britishfor Standard For dated references, subsequent amendments to, or revisions of, any BS S 147, Specification 0.5 % nickel-chromium-molybdenum steel bars for the manufacture of forged of these bolts andpublications forged nuts.do not apply For undated references, the latest edition of the publication referred to applies BS S 149, Specification of 1.75 % nickel-chromium-molybdenum steel bars for the manufacture of forged BS 3Aand 100:1991, Specification for general requirements for bolts and free running nuts of tensile strength bolts forged nuts not exceeding 249 MPa.2 % nickel-chromium-molybdenum steel billets, bars, forging and parts BS S 154, Specification BS S 154, 2½% nickel-chromium-molybdenum steel billets, bars, forgings and parts (880–1080 MPa: BS S 147,ruling Specification forruling 0.5 % section nickel-chromium-molybdenum steel bars for the manufacture of forged (1230-1430 Mpa: limiting 40 mm) limiting section 150 mm) bolts and forged nuts BS and BS 1580-2:1962, Specification Unified screw with threads Diameters inlarger and larger BS 1580-1 1580-1:2007, Unified screw threads – Part for 1: Screw threads diameter ¼ in and – BS S 149, Specification of 1.75for % nickel-chromium-molybdenum steel bars for BS 1580-3:1965, Specification Unified screw threads Diameters below in.the manufacture of forged Requirements bolts and forged nuts BSGeneral 1580-3:2007, Unified2 screw threads – Part 3: Screw threadssteel withbillets, diameters ¼ and in – Requirements requirements BS S 154, Specification % nickel-chromium-molybdenum bars,below forging parts (1230-1430 Mpa: limiting rulingofsection 40 mm) BS EN 2133, Cadmium plating steels with specified tensile strength ≤ 1450 MPa, copper, copper alloys Bolts shall conform to BS A 100 and1580-1 nickel and alloys BS BS 1580-2:1962, Specification for Unified screw threads Diameters in and larger Materials manufacture Def Stan 03-19, and Electro-Deposition of Cadmium. BS 1580-3:1965, Specification for Unified screw threads Diameters below in 4.1 The bolts shall be manufactured by one of the following methods: General requirements a) machined from to bright Bolts shall conform BS Adrawn 100 bars which conform to one of the British Standards specified in Table 1; b) cold forged from material which conforms to one of the British Standards specified in Table Materials and manufacture 4.2 The material used for the manufacture of forged bolts shall have the following mechanical properties 4.1 The bolts heat shall treated be manufactured in the finally condition: by one of the following methods: a) machined from bright which conform to one of the British Standards specified in Table 1; proof stress (min.): 0.2drawn % (690bars MPa); cold forged from material conforms to one of the British Standards specified in Table b) tensile stress: 880 MPa to which 080 MPa; elongation (min.): 12 %; 4.2c)The material used for the manufacture of forged bolts shall have the following mechanical properties in d) the finally heat treated Izod impact (min.): 55condition: J (40 ft lbf) a) proof stress (min.): 0.2 % (690 MPa); Dimensions and tolerances b) tensile stress: 880 MPa to 080 MPa; finished (min.): bolts, after 5.1c)All elongation 12 %;the application of the anti-corrosion coating, shall conform to the dimensions and tolerances specified in Figure and Table d) Izod impact (min.): 55 J (40 ft lbf) 5.2 The clamping length of the bolt shall conform to the dimensions and tolerances given in Table 2, and Dimensions shall be such that, and when tolerances a standard nut without countersink or ring gauge is screwed on as far as possible by hand, its leading face within a distance M from the underside of the bolt head The runout of the thread 5.1 All finished the application of the anti-corrosion coating, shall conform to the dimensions shall not exceedbolts, twice after the thread pitch and tolerances specified in Figure and Table 5.3 The nominal length of the bolt shall be the minimum bearing length L, which is determined by the 5.2 The clamping length of the bolt two shallthread conform to the(see dimensions minimum clamping length, M, less pitches Table 3) and tolerances given in Table 2, and shall be such that, when a standard nut without countersink or ring gauge is screwed on as far as possible NOTE The bearing lengths L specified in Table are in 0.10 inch increments but where a 0.05 length increment is required this by hand, its leading face within a distance M from the underside of the bolt head The runout of the thread should be by agreement between manufacturer and user and should be identified as follows: 8½ B, indicating a 6-32 UNC bolt of shall exceed thread pitch bearingnot length L 0.85twice inches.the M and E need to be adjusted accordingly 5.3 The nominal length of the bolt shall be the minimum bearing length L, which is determined by the minimum clamping length, M, less two thread pitches (see Table 3) NOTE The bearing lengths L specified in Table are in 0.10 inch increments but where a 0.05 length increment is required this should be by agreement between manufacturer and user and should be identified as follows: 8½ B, indicating a 6-32 UNC bolt of bearing length L 0.85 inches M and E need to be adjusted accordingly © BSI The 2009 British Standards Institution 2012 © 11 Licensed Copy: Ms Mary Groom, British Standards Institution, 24/05/2012 13:46, Uncontrolled Copy, (c) The British Standards Institution Licensed Copy: Ms Mary Groom, British Standards Institution, 24/05/2012 13:46, Uncontrolled Copy, (c) The British Standards Institution 20122012 d) Izod impact (min.): 55 J (40 ft lbf) Dimensions and tolerances BS 4A 102:2002+A2:2012 5.1 All finished bolts, after the application of the anti-corrosion coating, shall conform to the dimensions and tolerances specified in Figure and Table 5.2 The clamping length of the bolt shall conform to the dimensions and tolerances given in Table 2, and shall be such that, when a standard nut without countersink or ring gauge is screwed on as far as possible by hand, its leading face within a distance M from the underside of the bolt head The runout of the thread BS 4A 102:2002+A1:2006 shall not exceed twice the thread pitch BS 4A 102:2002+A1:2006 5.3 The nominal length of the bolt shall be the minimum bearing length L, which is determined by the minimum clamping length, M, less two thread pitches (see Table 3) NOTE The bearing lengths L specified in Table are in 0.10 inch increments but where a 0.05 length increment is required this should be by agreement between manufacturer and user and should be identified as follows: 8½ B, indicating a 6-32 UNC bolt of bearing length L 0.85 inches M and E need to be adjusted accordingly Screw threads The bolts shall have unified screw threads of the form fit that conform to BSedition 4A 100:2003 The bolts shall have unified screw threads of the form andand fit specified in the latest of BS AAfter 100 Screw threads the protective finish has been applied, the bolt threads shall not exceed the basic size (maximum metal After coating, the bolts shall be accepted thread of specified basic sizein(class 3A) conforming to A 100 The bolts shall have unified threads ofa the formgauge and fit the latest edition of BS condition) for the thread sizescrew and class of by fit. BS 1580-1-2:1962 or BS 1580-3:1965 © BSI 2009 After coating, the bolts shall be accepted by a thread gauge of basic size (class 3A) conforming to Protective finish BSAnti-corrosion 1580-1-2:1962 or BS 1580-3:1965 treatment All bolts shall be coated with cadmium in accordance with in Defaccordance Stan 03-19with or BS 2133. All finished bolts shall be uniformly coated with cadmium BSEN A 100 Anti-corrosion treatment AllHardness finished bolts shall be uniformly coated with cadmium in accordance with BS A 100 values The hardness values of finished bolts shall be as follows: Hardness values a) hardness 255 min./321 max HB; or bolts shall be as follows: The values of finished b) a) 270 255 min./340 min./321 max max HV HB; or 270 min./340 max HV.marking b) Identification and The bolts shall be marked in accordance with requirements specified in BS 100:2003, The bolts shall be marked accordance with thethe requirements specified in BS 3A 4A 100:1991, clause Identification andinmarking Clause 8, e.g A102-20C, which would be marked on a bolt with thread size 8-32 UNC and bearing length TheQuality bolts shallassurance be marked in procedure accordance with the requirements specified in BS 3A 100:1991, clause 10 2.0 inches. The bolts shallassurance conform to theprocedure quality requirements specified in BS A 100, as appropriate to the method of 10 Quality manufacture The bolts shall conform to the quality requirements specified in BS A 100, as appropriate to the method of Table — Materials for manufacture of bolts manufacture BS No S 154 BS No S 154 S 154 BS S 147 S 147 S 147 BS S 149 S 149 S 149 BS Material Application Table — Materials for manufacture of bolts 2 % nickel chromium For the manufacture of Material Application molybdenum steel machined bolts 2 % nickel chromium For the manufacture of % nickel chromium For the manufacture of molybdenum steel machined bolts molybdenum steel forged % nickel chromium For thebolts manufacture of 1.75 % nickel steel chromium For thebolts manufacture of molybdenum forged molybdenum steel forged bolts 1.75 % nickel chromium For the manufacture of molybdenum steel forged bolts © The British Standards Institution 2012 blank Licensed Copy: Ms Mary Groom, British Standards Institution, 24/05/2012 13:46, Uncontrolled Copy, (c) The British Standards Institution 2012 4 a) B C 30º D M* (for ref only) F b) 30º D Figure — Dimensions of bolts (see Table 2) G 45º Max runout of thread = x pitch (overall length) E* (clamping length) A R rad 15º (bearing length) L* 0.015 in R rad Dia of washer face = B - 0.01 in Licensed Copy: Ms Mary Groom, British Standards Institution, 24/05/2012 13:46, Uncontrolled Copy, (c) The British Standards Institution 2012 BS BS 4A 4A 102:2002+A1:2006 102:2002+A2:2012 © The British Standards Institution © BSI2012 2009 © BSI 2009 11 22 334 445 55 66 77 88 99 10 10 10 11 11 11 12 12 1213 13 13 14 14 14 15 15 15 in in in inin in max max A A inin in min © BSI The 2009 British Standards Institution 2012 © FF B in in in 0.050 0.050 0.300 0.063 0.063 0.277 0.063 0.063 0.327 0.063 0.063 0.377 in in in 0.300 0.300 0.188 0.277 0.277 0.250 0.327 0.327 0.312 0.377 0.377 0.344 inin in 0.188 0.188 0.183 0.250 0.250 0.245 0.312 0.312 0.307 0.344 0.344 0.339 in in in in in in max max max C C 0.217 0.217 0.070 0.289 0.289 0.085 0.361 0.361 0.100 0.397 0.397 0.115 min max C 0.183 0.183 0.217 0.245 0.245 0.289 0.307 0.307 0.361 0.339 0.339 0.397 B B Ref onlyRef Ref only only max max min ref max F in in in 0.070 0.070 0.060 0.085 0.085 0.075 0.100 0.100 0.090 0.115 0.115 0.105 in in in min max 0.060 0.060 0.015 0.075 0.075 0.015 0.090 0.090 0.020 0.105 0.105 0.020 D D max max D in in in max max R R 0.015 0.015 0.005 0.015 0.015 0.005 0.020 0.020 0.010 0.020 0.020 0.010 R 0.005 0.005 0.020 0.005 0.005 0.030 0.010 0.010 0.030 0.010 0.010 0.030 inin in min max inin in max max 0.020 0.020 0.015 0.030 0.030 0.020 0.030 0.030 0.020 0.030 0.030 0.020 G in in min 0.015 0.015 0.020 0.020 0.020 0.020 0.020 0.020 G G This dimension This This dimension dimension is an absolute is is an an absolute absolute minimum minimum minimum associated associated associated with maximum with with maximum maximum length Mlength length and minimum M M and and minimum minimum length E.length length It is not E E It intended It is is not not intended intended for use for for formanufacturing use use for for manufacturing manufacturing or inspection or or inspection inspection purposes purposes purposes 1.000-12 UNF (W) 1.0000 0.99950.9995 0.99550.9955 0.167 0.167 1.478 1.478 1.438 1.438 1.426 1.426 1.660 1.660 0.620 0.620 0.610 0.610 0.030 0.030 0.015 0.015 0.075 0.075 0.065 0.065 1.000-12 UNF (W) (W) 1.0000 0.9995 0.9955 0.167 1.478 1.438 1.426 1.660 0.620 0.610 0.030 0.015 0.075 0.065 1.000-12 UNF UNF(W) 1.00-121.0000 UNF * For bearing ** For For length bearing bearingL,length length clampling L, L, clampling clampling length Mlength length and overall M M and andlength overall overallElength length see Table E E see see Table Table 3 5/8-18 UNF 0.625-18 UNF (Q) 0.6250 0.62450.6245 0.62050.6205 0.111 0.111 0.949 0.949 0.938 0.938 0.929 0.929 1.083 1.083 0.390 0.390 0.380 0.380 0.030 0.030 0.015 0.015 0.060 0.060 0.050 0.050 0.625-18 UNF (Q) (Q) 0.6250 0.625-18 UNF 0.6250 0.6245 0.6205 0.111 0.949 0.938 0.929 1.083 0.390 0.380 0.030 0.015 0.060 0.050 UNF(Q) 0.750-16 UNF (S) 0.7500 0.7495 0.7455 0.125 1.120 1.062 1.052 1.227 0.480 0.470 0.030 0.015 0.075 0.065 0.750-16 0.750-16 UNF UNF (S) (S) 0.7500 0.7500 0.7495 0.7495 0.7455 0.7455 0.125 0.125 1.120 1.120 1.062 1.062 1.052 1.052 1.227 1.227 0.480 0.480 0.470 0.470 0.030 0.030 0.015 0.015 0.075 0.075 0.065 0.065 UNF(S) /4-16 UNF 7/8-14 UNF 0.875-14 UNF (U) 0.8750 0.87450.8745 0.87050.8705 0.143 0.143 1.302 1.302 1.250 1.250 1.240 1.240 1.443 1.443 0.530 0.530 0.520 0.520 0.030 0.030 0.015 0.015 0.075 0.075 0.065 0.065 0.875-14 0.875-14 UNF UNF (U) (U) 0.8750 0.8750 0.8745 0.8705 0.143 1.302 1.250 1.240 1.443 0.530 0.520 0.030 0.015 0.075 0.065 UNF(U) 7(L) 0.4375-20 0.4375-20 UNF (L) UNF0.4375 0.4375 0.43700.4370 0.4370 0.43350.4335 0.4335 0.100 0.100 0.100 0.670 0.670 0.670 0.688 0.688 0.688 0.679 0.679 0.679 0.794 0.794 0.794 0.270 0.270 0.270 0.260 0.260 0.260 0.030 0.030 0.030 0.015 0.015 0.015 0.050 0.050 0.050 0.040 0.040 0.040 0.4375-20 UNF 0.4375 0.4375-20 UNF(L) /(L) 16-20 UNF 1/2-20 UNF 0.500-20 0.500-20 UNF (N) UNF (N) (N) 0.5000 0.5000 0.49950.4995 0.4995 0.49600.4960 0.4960 0.100 0.100 0.100 0.770 0.770 0.770 0.750 0.750 0.750 0.741 0.741 0.741 0.866 0.866 0.866 0.300 0.300 0.300 0.290 0.290 0.290 0.030 0.030 0.030 0.015 0.015 0.015 0.050 0.050 0.050 0.040 0.040 0.040 0.500-20 UNF 0.5000 UNF(N) 9(P) 0.5625-18 0.5625-18 UNF (P) UNF0.5625 (P) 0.5625 0.56200.5620 0.55850.5585 0.111 0.111 0.859 0.859 0.875 0.875 0.866 0.866 1.010 1.010 0.350 0.350 0.340 0.340 0.030 0.030 0.015 0.015 0.050 0.050 0.040 0.040 0.5625-18 UNF 0.5625 0.5620 0.5585 0.111 0.859 0.875 0.866 1.010 0.350 0.340 0.030 0.015 0.050 0.040 UNF(P) /16-18 UNF 1(E) 250-28 55UNF 0.22UNF(E) 0-28 (E) UNF0.2500 (E) 0.2500 0.24950.2495 0.2495 0.24650.2465 0.2465 0.071 0.071 0.071 0.459 0.459 0.459 0.438 0.438 0.438 0.431 0.431 0.431 0.505 0.505 0.505 0.150 0.150 0.150 0.140 0.140 0.140 0.030 0.030 0.030 0.015 0.015 0.015 0.040 0.040 0.040 0.030 0.030 0.030 0-28 UNF 0.2500 0.250-28 /4-28 UNF 5(G) 0.3125-24 0.3125-24 UNF (G) UNF0.3125 (G) 0.3125 0.31200.3120 0.3120 0.30900.3090 0.3090 0.083 0.083 0.083 0.497 0.497 0.497 0.500 0.500 0.500 0.493 0.493 0.493 0.577 0.577 0.577 0.180 0.180 0.180 0.170 0.170 0.170 0.030 0.030 0.030 0.015 0.015 0.015 0.040 0.040 0.040 0.030 0.030 0.030 0.3125-24 UNF 0.3125 0.3125-24 UNF(G) /16-24 UNF 3/8-24 UNF 0.375-24 0.375-24 UNF (J) UNF (J) (J) 0.3750 0.3750 0.37450.3745 0.3745 0.37150.3715 0.3715 0.083 0.083 0.083 0.597 0.597 0.597 0.562 0.562 0.562 0.554 0.554 0.554 0.650 0.650 0.650 0.220 0.220 0.220 0.210 0.210 0.210 0.030 0.030 0.030 0.015 0.015 0.015 0.040 0.040 0.040 0.030 0.030 0.030 0.375-24 UNF 0.3750 0.3725-24 UNF(J) 0.112-40 UNC(4) 4-40 UNC 0.112-40 0.112-40 0.112-40 UNC (4) UNC UNC (4) (4) 0.1120 0.1120 0.1120 0.11150.1115 0.1115 0.10850.1085 0.1085 0.050 0.138-32 0.138-32 0.138-32 UNC (6) UNC UNC (6) (6) 0.1380 0.1380 0.1380 0.13750.1375 0.1375 0.13450.1345 0.1345 0.063 0.138-32 UNC(6) 6-32 UNC 0.164-32 0.164-32 0.164-32 UNC (8) UNC UNC (8) (8) 0.1640 0.1640 0.1640 0.16350.1635 0.1635 0.16050.1605 0.1605 0.063 0.164-32 UNC(8) 8-32 UNC 0.190-32 0.190-32 0.190-32 UNF (10) UNF UNF (10) (10) 0.1900 0.1900 0.1900 0.18950.1895 0.1895 0.18650.1865 0.1865 0.063 0.190-32 UNF(10) 10-32 UNF in max A Width across Width Widthflats across across flats Width flats Width Width Thickness Thickness Thickness of headof ofRadius head head Radius under Radiusbolt under underbolt bolt Depth of Depth Depth of of Diameter of Diameter Diameter of of 22 Min Min Min Nominal Nominal Nominal size size size DecimalDecimal Decimal across across across plain portion of pitch plain plain portion portion of of Thread length length length of of equivalent equivalent Decimal equivalent of equivalent Nominal thread heat heat heat chamferchamfer chamfer pitch pitch of screwedscrewed screwed of ofnominal nominal of nominal nominal thread size size runout cornerscorners corners shank shank shank portion portion portion (2 × size size size pitch) of shank of of shank shank Table Table Table — Dimensions 22 — — Dimensions Dimensions of bolts of of bolts bolts Licensed Licensed Licensed Copy: Ms Copy: Copy: Mary Ms MsGroom, Mary Mary Groom, Groom, British British Standards British Standards Standards Institution, Institution, Institution, 24/05/2012 24/05/2012 24/05/2012 13:46, 13:46, Uncontrolled 13:46, Uncontrolled Uncontrolled Copy, (c) Copy, Copy, The(c) (c) British The The British Standards British Standards Standards Institution Institution Institution 2012 2012 2012 BS 4A 102:2002+A1:2006 BS 4A 4A 102:2002+A2:2012 102:2002+A1:2006 BS 5 6 b) M M E Figure — Bearing length L, clamping length M and overall length E (see Table 3) a) L L E Licensed Copy: Ms Mary Groom, British Standards Institution, 24/05/2012 13:46, Uncontrolled Copy, (c) The British Standards Institution 2012 BS BS 4A 4A 102:2002+A1:2006 102:2002+A2:2012 © The British Standards Institution © BSI2012 2009 © BSI The British © 2009 Standards Institution 2012 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 11A 12A 13A 14A 15A 16A 17A 18A 19A 20A 21A 22A 23A 24A 25A 26A 27A 2.680 2.780 1.680 1.780 1.880 1.980 2.080 2.180 2.280 2.380 2.480 2.580 1.180 1.280 1.380 1.480 1.580 0.680 0.780 0.880 0.980 1.080 3.00 3.10 2.00 2.10 2.20 2.30 2.40 2.50 2.60 2.70 2.80 2.90 1.50 1.60 1.70 1.80 1.90 1.00 1.10 1.20 1.30 1.40 0.45 0.50 0.60 0.70 0.80 0.90 in E +0.04 –0 26B 27B 28B 16B 17B 18B 19B 20B 21B 22B 23B 24B 25B 11B 12B 13B 14B 15B 6B 7B 8B 9B 10B B 1B 2B 3B 4B 5B Part No 2.6 2.7 2.8 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 1.1 1.2 1.3 1.4 1.5 0.6 0.7 0.8 0.9 1.0 0.05 0.1 0.2 0.3 0.4 0.5 in L* 2.00 2.10 2.20 2.30 2.40 2.50 2.60 2.70 2.80 2.90 3.00 3.10 3.20 2.693 2.793 2.893 1.50 1.60 1.70 1.80 1.90 1.00 1.10 1.20 1.30 1.40 0.45 0.50 0.60 0.70 0.80 0.90 in E +0.04 –0 1.693 1.793 1.893 1.993 2.093 2.193 2.293 2.393 2.493 2.593 1.193 1.293 1.393 1.493 1.593 0.693 0.793 0.893 0.993 1.093 0.143 0.193 0.293 0.393 0.493 0.593 in M +0 – 0.03 No 6-32 UNC 26C 27C 28C 16C 17C 18C 19C 20C 21C 22C 23C 24C 25C 11C 12C 13C 14C 15C 6C 7C 8C 9C 10C C 1C 2C 3C 4C 5C Part No 2.6 2.7 2.8 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 1.1 1.2 1.3 1.4 1.5 0.6 0.7 0.8 0.9 1.0 0.05 0.1 0.2 0.3 0.4 0.5 in L* 2.693 2.793 2.893 1.693 1.793 1.893 1.993 2.093 2.193 2.293 2.393 2.493 2.593 1.193 1.293 1.393 1.493 1.593 0.693 0.793 0.893 0.993 1.093 0.143 0.193 0.293 0.393 0.493 0.593 in M +0 – 0.03 No 8-32 UNC 3.05 3.15 3.25 2.05 2.15 2.25 2.35 2.45 2.55 2.65 2.75 2.85 2.95 1.55 1.65 1.75 1.85 1.95 1.05 1.15 1.25 1.35 1.45 0.50 0.55 0.65 0.75 0.85 0.95 in E +0.04 –0 * See 5.3 NOTE Bolts below the heavy line may not be readily available in large quantities because of limitations in manufacture by forging 0.6 0.7 0.8 0.9 1.0 6A 7A 8A 9A 10A in in 0.130 0.180 0.280 0.380 0.480 0.580 0.05 0.1 0.2 0.3 0.4 0.5 M +0 – 0.03 L* No 4-40 UNC A 1A 2A 3A 4A 5A Part No 26D 27D 28D 16D 17D 18D 19D 20D 21D 22D 23D 24D 25D 11D 12D 13D 14D 15D 6D 7D 8D 9D 10D D 1D 2D 3D 4D 5D Part No Table — Bearing length L, clamping length M and overall length E 2.6 2.7 2.8 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 1.1 1.2 1.3 1.4 1.5 0.6 0.7 0.8 0.9 1.0 0.05 0.1 0.2 0.3 0.4 0.5 in L* 2.693 2.793 2.893 1.693 1.793 1.893 1.993 2.093 2.193 2.293 2.393 2.493 2.593 1.193 1.293 1.393 1.493 1.593 0.693 0.793 0.893 0.993 1.093 0.143 0.193 0.293 0.393 0.493 0.593 in M +0 – 0.03 No 10-32 UNF 3.10 3.20 3.30 2.10 2.20 2.30 2.40 2.50 2.60 2.70 2.80 2.90 3.00 1.60 1.70 1.80 1.90 2.00 1.10 1.20 1.30 1.40 1.50 0.55 0.60 0.70 0.80 0.90 1.00 in E +0.04 –0 Licensed Copy: Ms Mary Groom, British Standards Institution, 24/05/2012 13:46, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 4A 102:2002+A2:2012 102:2002+A1:2006 BS 77 Licensed Copy: Ms Mary Groom, British Standards Institution, 24/05/2012 13:46, Uncontrolled Copy, (c) The British Standards Institution 2012 BS BS 4A 4A 102:2002+A1:2006 102:2002+A2:2012 Table — Bearing length L, clamping length M and overall length E (continued) No 6-32 UNC Part No L* in M +0 – 0.03 in No 8-32 UNC E +0.04 –0 Part No L* in in M +0 – 0.03 in No 10-32 UNC E +0.04 –0 Part No L* in in M +0 – 0.03 in E +0.04 –0 in 29B 30B 31B 32B 33B 2.9 3.0 3.1 3.2 3.3 2.993 3.093 3.193 3.293 3.393 3.30 3.40 3.50 3.60 3.70 29C 30C 31C 32C 33C 2.9 3.0 3.1 3.2 3.3 2.993 3.093 3.193 3.293 3.393 3.35 3.45 3.55 3.65 3.75 29D 30D 31D 32D 33D 2.9 3.0 3.1 3.2 3.3 2.993 3.093 3.193 3.293 3.393 3.40 3.50 3.60 3.70 3.80 34B 35B 36B 37B 38B 3.4 3.5 3.6 3.7 3.8 3.493 3.593 3.693 3.793 3.893 3.80 3.90 4.00 4.10 4.20 34C 35C 36C 37C 38C 3.4 3.5 3.6 3.7 3.8 3.493 3.593 3.693 3.793 3.893 3.85 3.95 4.05 4.15 4.25 34D 35D 36D 37D 38D 3.4 3.5 3.6 3.7 3.8 3.493 3.593 3.693 3.793 3.893 3.90 4.00 4.10 4.20 4.30 39B 40B 41B 42B 43B 3.9 4.0 4.1 4.2 4.3 3.993 4.093 4.193 4.293 4.393 4.30 4.40 4.50 4.60 4.70 39C 40C 41C 42C 43C 3.9 4.0 4.1 4.2 4.3 3.993 4.093 4.193 4.293 4.393 4.35 4.45 4.55 4.65 4.75 39D 40D 41D 42D 43D 3.9 4.0 4.1 4.2 4.3 3.993 4.093 4.193 4.293 4.393 4.40 4.50 4.60 4.70 4.80 44B 45B 46B 47B 48B 4.4 4.5 4.6 4.7 4.8 4.493 4.593 4.693 4.793 4.893 4.80 4.90 5.00 5.10 5.20 44C 45C 46C 47C 48C 4.4 4.5 4.6 4.7 4.8 4.493 4.593 4.693 4.793 4.893 4.85 4.95 5.05 5.15 5.25 44D 45D 46D 47D 48D 4.4 4.5 4.6 4.7 4.8 4.493 4.593 4.693 4.793 4.893 4.90 5.00 5.10 5.20 5.30 49B 50B 51B 52B 53B 4.9 5.0 5.1 5.2 5.3 4.993 5.093 5.193 5.293 5.393 5.30 5.40 5.50 5.60 5.70 49C 50C 51C 52C 53C 4.9 5.0 5.1 5.2 5.3 4.993 5.093 5.193 5.293 5.393 5.35 5.45 5.55 5.65 5.75 49D 50D 51D 52D 53D 4.9 5.0 5.1 5.2 5.3 4.993 5.093 5.193 5.293 5.393 5.40 5.50 5.60 5.70 5.80 54D 55D 56D 57D 58D 5.4 5.5 5.6 5.7 5.8 5.493 5.593 5.693 5.793 5.893 5.90 6.00 6.10 6.20 6.30 59D 60D 5.9 6.0 5.993 6.093 6.40 6.50 * See 5.3 8 © The British Standards Institution © BSI2012 2009 Licensed Copy: Ms Mary Groom, British Standards Institution, 24/05/2012 13:46, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 4A 102:2002+A2:2012 102:2002+A1:2006 BS Table — Bearing length L, clamping length M and overall length E (continued) in UNF Part No L* in M +0 – 0.03 in in UNF E +0.04 –0 Part No L* in in 0.05 0.1 0.2 0.3 0.4 0.5 0.151 0.201 0.301 0.401 0.501 0.601 0.65 0.70 0.80 0.90 1.00 1.10 ½G 1G 2G 3G 4G 5G 6E 7E 8E 9E 10E 0.6 0.7 0.8 0.9 1.0 0.701 0.801 0.901 1.001 1.101 1.20 1.30 1.40 1.50 1.60 11E 12E 13E 14E 15E 1.1 1.2 1.3 1.4 1.5 1.201 1.301 1.401 1.501 1.601 16E 17E 18E 19E 20E 1.6 1.7 1.8 1.9 2.0 21E 22E 23E 24E 25E M +0 – 0.03 in in UNF E +0.04 –0 Part No L* in in M +0 – 0.03 in E +0.04 –0 in 0.05 0.1 0.2 0.3 0.4 0.5 0.163 0.213 0.313 0.413 0.513 0.613 0.70 0.75 0.85 0.95 1.05 1.15 1J 2J 3J 4J 5J 0.1 0.2 0.3 0.4 0.5 0.213 0.313 0.413 0.513 0.613 0.85 0.95 1.05 1.15 1.25 6G 7G 8G 9G 10G 0.6 0.7 0.8 0.9 1.0 0.713 0.813 0.913 1.013 1.113 1.25 1.35 1.45 1.55 1.65 6J 7J 8J 9J 10J 0.6 0.7 0.8 0.9 1.0 0.713 0.813 0.913 1.013 1.113 1.35 1.45 1.55 1.65 1.75 1.70 1.80 1.90 2.00 2.10 11G 12G 13G 14G 15G 1.1 1.2 1.3 1.4 1.5 1.213 1.313 1.413 1.513 1.613 1.75 1.85 1.95 2.05 2.15 11J 12J 13J 14J 15J 1.1 1.2 1.3 1.4 1.5 1.213 1.313 1.413 1.513 1.613 1.85 1.95 2.05 2.15 2.25 1.701 1.801 1.901 2.001 2.101 2.20 2.30 2.40 2.50 2.60 16G 17G 18G 19G 20G 1.6 1.7 1.8 1.9 2.0 1.713 1.813 1.913 2.013 2.113 2.25 2.35 2.45 2.55 2.65 16J 17J 18J 19J 20J 1.6 1.7 1.8 1.9 2.0 1.713 1.813 1.913 2.013 2.113 2.35 2.45 2.55 2.65 2.75 2.1 2.2 2.3 2.4 2.5 2.201 2.301 2.401 2.501 2.601 2.70 2.80 2.90 3.00 3.10 21G 22G 23G 24G 25G 2.1 2.2 2.3 2.4 2.5 2.213 2.313 2.413 2.513 2.613 2.75 2.85 2.95 3.05 3.15 21J 22J 23J 24J 25J 2.1 2.2 2.3 2.4 2.5 2.213 2.313 2.413 2.513 2.613 2.85 2.95 3.05 3.15 3.25 26E 27E 28E 29E 30E 2.6 2.7 2.8 2.9 3.0 2.701 2.801 2.901 3.001 3.101 3.20 3.30 3.40 3.50 3.60 26G 27G 28G 29G 30G 2.6 2.7 2.8 2.9 3.0 2.713 2.813 2.913 3.013 3.113 3.25 3.35 3.45 3.55 3.65 26J 27J 28J 29J 30J 2.6 2.7 2.8 2.9 3.0 2.713 2.813 2.913 3.013 3.113 3.35 3.45 3.55 3.65 3.75 31E 32E 33E 34E 35E 3.1 3.2 3.3 3.4 3.5 3.201 3.301 3.401 3.501 3.601 3.70 3.80 3.90 4.00 4.10 31G 32G 33G 34G 35G 3.1 3.2 3.3 3.4 3.5 3.213 3.313 3.413 3.513 3.613 3.75 3.85 3.95 4.05 4.15 31J 32J 33J 34J 35J 3.1 3.2 3.3 3.4 3.5 3.213 3.313 3.413 3.513 3.613 3.85 3.95 4.05 4.15 4.25 E 1E 2E 3E 4E 5E NOTE Bolts below the heavy line may not be readily available in large quantities because of limitations in manufacture by forging * See 5.3 © BSI The 2009 British Standards Institution 2012 © 99 Licensed Copy: Ms Mary Groom, British Standards Institution, 24/05/2012 13:46, Uncontrolled Copy, (c) The British Standards Institution 2012 BS BS 4A 4A 102:2002+A1:2006 102:2002+A2:2012 Table — Bearing length L, clamping length M and overall length E (continued) in UNF Part No L* in M +0 – 0.03 in in UNF E +0.04 –0 Part No L* in in M +0 – 0.03 in in UNF E +0.04 –0 Part No L* in in M +0 – 0.03 in E +0.04 –0 in 36E 37E 38E 39E 40E 3.6 3.7 3.8 3.9 4.0 3.701 3.801 3.901 4.001 4.101 4.20 4.30 4.40 4.50 4.60 36G 37G 38G 39G 40G 3.6 3.7 3.8 3.9 4.0 3.713 3.813 3.913 4.013 4.113 4.25 4.35 4.45 4.55 4.65 36J 37J 38J 39J 40J 3.6 3.7 3.8 3.9 4.0 3.713 3.813 3.913 4.013 4.113 4.35 4.45 4.55 4.65 4.75 41E 42E 43E 44E 45E 4.1 4.2 4.3 4.4 4.5 4.201 4.301 4.401 4.501 4.601 4.70 4.80 4.90 5.00 5.10 41G 42G 43G 44G 45G 4.1 4.2 4.3 4.4 4.5 4.213 4.313 4.413 4.513 4.613 4.75 4.85 4.95 5.00 5.15 41J 42J 43J 44J 45J 4.1 4.2 4.3 4.4 4.5 4.213 4.313 4.413 4.513 4.613 4.85 4.95 5.05 5.15 5.25 46E 47E 48E 49E 50E 4.6 4.7 4.8 4.9 5.0 4.701 4.801 4.901 5.001 5.101 5.20 5.30 5.40 5.50 5.60 46G 47G 48G 49G 50G 4.6 4.7 4.8 4.9 5.0 4.713 4.813 4.913 5.013 5.113 5.25 5.35 5.45 5.55 5.65 46J 47J 48J 49J 50J 4.6 4.7 4.8 4.9 5.0 4.713 4.813 4.913 5.013 5.113 5.35 5.45 5.55 5.65 5.75 51E 52E 53E 54E 55E 5.1 5.2 5.3 5.4 5.5 5.201 5.301 5.401 5.501 5.601 5.70 5.80 5.90 6.00 6.10 51G 52G 53G 54G 55G 5.1 5.2 5.3 5.4 5.5 5.213 5.313 5.413 5.513 5.613 5.75 5.85 5.95 6.05 6.15 51J 52J 53J 54J 55J 5.1 5.2 5.3 5.4 5.5 5.213 5.313 5.413 5.513 5.613 5.85 5.95 6.05 6.15 6.25 56E 57E 58E 59E 60E 5.6 5.7 5.8 5.9 6.0 5.701 5.801 5.901 6.001 6.101 6.20 6.30 6.40 6.50 6.60 56G 57G 58G 59G 60G 5.6 5.7 5.8 5.9 6.0 5.713 5.813 5.913 6.013 6.113 6.25 6.35 6.45 6.55 6.65 56J 57J 58J 59J 60J 5.6 5.7 5.8 5.9 6.0 5.713 5.813 5.913 6.013 6.113 6.35 6.45 6.55 6.65 6.75 61G 62G 63G 64G 65G 6.1 6.2 6.3 6.4 6.5 6.213 6.313 6.413 6.513 6.613 6.75 6.85 6.95 7.05 7.15 61J 62J 63J 64J 65J 6.1 6.2 6.3 6.4 6.5 6.213 6.313 6.413 6.513 6.613 6.85 6.95 7.05 7.15 7.25 66G 67G 68G 69G 70G 6.6 6.7 6.8 6.9 7.0 6.713 6.813 6.913 7.013 7.113 7.25 7.35 7.45 7.55 7.65 66J 67J 68J 69J 70J 6.6 6.7 6.8 6.9 7.0 6.713 6.813 6.913 7.013 7.113 7.35 7.45 7.55 7.65 7.75 * See 5.3 10 © The British Standards Institution © BSI 2012 2009 Licensed Copy: Ms Mary Groom, British Standards Institution, 24/05/2012 13:46, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 4A 102:2002+A2:2012 102:2002+A1:2006 BS Table — Bearing length L, clamping length M and overall length E (continued) in UNF in UNF Part No L* in M +0 – 0.03 in E +0.04 –0 Part No L* in in M +0 – 0.03 in in UNF E +0.04 –0 Part No L* in in M +0 – 0.03 in E +0.04 –0 in 1L 2L 3L 4L 5L 0.1 0.2 0.3 0.4 0.5 0.230 0.330 0.430 0.530 0.630 0.95 1.05 1.15 1.25 1.35 1N 2N 3N 4N 5N 0.1 0.2 0.3 0.4 0.5 0.230 0.330 0.430 0.530 0.630 1.05 1.15 1.25 1.35 1.45 1P 2P 3P 4P 5P 0.1 0.2 0.3 0.4 0.5 0.241 0.341 0.441 0.541 0.641 1.15 1.25 1.35 1.45 1.55 6L 7L 8L 9L 10L 0.6 0.7 0.8 0.9 1.0 0.730 0.830 0.930 1.030 1.130 1.45 1.55 1.65 1.75 1.85 6N 7N 8N 9N 10N 0.6 0.7 0.8 0.9 1.0 0.730 0.830 0.930 1.030 1.130 1.55 1.65 1.75 1.85 1.95 6P 7P 8P 9P 10P 0.6 0.7 0.8 0.9 1.0 0.741 0.841 0.941 1.041 1.141 1.65 1.75 1.85 1.95 2.05 11L 12L 13L 14L 15L 1.1 1.2 1.3 1.4 1.5 1.230 1.330 1.430 1.530 1.630 1.95 2.05 2.15 2.25 2.35 11N 12N 13N 14N 15N 1.1 1.2 1.3 1.4 1.5 1.230 1.330 1.430 1.530 1.630 2.05 2.15 2.25 2.35 2.45 11P 12P 13P 14P 15P 1.1 1.2 1.3 1.4 1.5 1.241 1.341 1.441 1.541 1.641 2.15 2.25 2.35 2.45 2.55 16L 17L 18L 19L 20L 1.6 1.7 1.8 1.9 2.0 1.730 1.830 1.930 2.030 2.130 2.45 2.55 2.65 2.75 2.85 16N 17N 18N 19N 20N 1.6 1.7 1.8 1.9 2.0 1.730 1.830 1.930 2.030 2.130 2.55 2.65 2.75 2.85 2.95 16P 17P 18P 19P 20P 1.6 1.7 1.8 1.9 2.0 1.741 1.841 1.941 2.041 2.141 2.65 2.75 2.85 2.95 3.05 21L 22L 23L 24L 25L 2.1 2.2 2.3 2.4 2.5 2.230 2.330 2.430 2.530 2.630 2.95 3.05 3.15 3.25 3.35 21N 22N 23N 24N 25N 2.1 2.2 2.3 2.4 2.5 2.230 2.330 2.430 2.530 2.630 3.05 3.15 3.25 3.35 3.45 21P 22P 23P 24P 25P 2.1 2.2 2.3 2.4 2.5 2.241 2.341 2.441 2.541 2.641 3.15 3.25 3.35 3.45 3.55 26L 27L 28L 29L 30L 2.6 2.7 2.8 2.9 3.0 2.730 2.830 2.930 3.030 3.130 3.45 3.55 3.65 3.75 3.85 26N 27N 28N 29N 30N 2.6 2.7 2.8 2.9 3.0 2.730 2.830 2.930 3.030 3.130 3.55 3.65 3.75 3.85 3.95 26P 27P 28P 29P 30P 2.6 2.7 2.8 2.9 3.0 2.741 2.841 2.941 3.041 3.141 3.65 3.75 3.85 3.95 4.05 * See 5.3 © BSI The 2009 British Standards Institution 2012 © 11 11 Licensed Copy: Ms Mary Groom, British Standards Institution, 24/05/2012 13:46, Uncontrolled Copy, (c) The British Standards Institution 2012 BS BS 4A 4A 102:2002+A1:2006 102:2002+A2:2012 Table — Bearing length L, clamping length M and overall length E (continued) in UNF Part No L* in M +0 – 0.03 in in UNF E +0.04 –0 Part No L* in in M +0 – 0.03 in in UNF E +0.04 –0 Part No L* in in M +0 – 0.03 in E +0.04 –0 in 31L 32L 33L 34L 35L 3.1 3.2 3.3 3.4 3.5 3.230 3.330 3.430 3.530 3.630 3.95 4.05 4.15 4.25 4.35 31N 32N 33N 34N 35N 3.1 3.2 3.3 3.4 3.5 3.230 3.330 3.430 3.530 3.630 4.05 4.15 4.25 4.35 4.45 31P 32P 33P 34P 35P 3.1 3.2 3.3 3.4 3.5 3.241 3.341 3.441 3.541 3.641 4.15 4.25 4.35 4.45 4.55 36L 37L 38L 39L 40L 3.6 3.7 3.8 3.9 4.0 3.730 3.830 3.930 4.030 4.130 4.45 4.55 4.65 4.75 4.85 36N 37N 38N 39N 40N 3.6 3.7 3.8 3.9 4.0 3.730 3.830 3.930 4.030 4.130 4.55 4.65 4.75 4.85 4.95 36P 37P 38P 39P 40P 3.6 3.7 3.8 3.9 4.0 3.741 3.841 3.941 4.041 4.141 4.65 4.75 4.85 4.95 5.05 41L 42L 43L 44L 45L 4.1 4.2 4.3 4.4 4.5 4.230 4.330 4.430 4.530 4.630 4.95 5.05 5.15 5.25 5.35 41N 42N 43N 44N 45N 4.1 4.2 4.3 4.4 4.5 4.230 4.330 4.430 4.530 4.630 5.05 5.15 5.25 5.35 5.45 41P 42P 43P 44P 45P 4.1 4.2 4.3 4.4 4.5 4.241 4.341 4.441 4.541 4.641 5.15 5.25 5.35 5.45 5.55 46L 47L 48L 49L 50L 4.6 4.7 4.8 4.9 5.0 4.730 4.830 4.930 5.030 5.130 5.45 5.55 5.65 5.75 5.85 46N 47N 48N 49N 50N 4.6 4.7 4.8 4.9 5.0 4.730 4.830 4.930 5.030 5.130 5.55 5.65 5.75 5.85 5.95 46P 47P 48P 49P 50P 4.6 4.7 4.8 4.9 5.0 4.741 4.841 4.941 5.041 5.141 5.65 5.75 5.85 5.95 6.05 51L 52L 53L 54L 55L 5.1 5.2 5.3 5.4 5.5 5.230 5.330 5.430 5.530 5.630 5.95 6.05 6.15 6.25 6.35 51N 52N 53N 54N 55N 5.1 5.2 5.3 5.4 5.5 5.230 5.330 5.430 5.530 5.630 6.05 6.15 6.25 6.35 6.45 51P 52P 53P 54P 55P 5.1 5.2 5.3 5.4 5.5 5.241 5.341 5.441 5.541 5.641 6.15 6.25 6.35 6.45 6.55 56L 57L 58L 59L 5.6 5.7 5.8 5.9 5.730 5.830 5.930 6.030 6.45 6.55 6.65 6.75 56N 57N 58N 59N 5.6 5.7 5.8 5.9 5.730 5.830 5.930 6.030 6.55 6.65 6.75 6.85 56P 5.6 5.741 6.65 NOTE Bolts below the heavy line may not be readily available in large quantities because of limitations in manufacture by forging * See 5.3 12 © The British Standards Institution © BSI 2012 2009 Licensed Copy: Ms Mary Groom, British Standards Institution, 24/05/2012 13:46, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 4A 102:2002+A2:2012 102:2002+A1:2006 BS Table — Bearing length L, clamping length M and overall length E (continued) in UNF in UNF Part No L* in M +0 – 0.03 in E +0.04 –0 Part No L* in in M +0 – 0.03 in in UNF E +0.04 –0 in 60L 61L 62L 63L 64L 6.0 6.1 6.2 6.3 6.4 6.130 6.230 6.330 6.430 6.530 6.85 6.95 7.05 7.15 7.25 60N 61N 62N 63N 64N 6.0 6.1 6.2 6.3 6.4 6.130 6.230 6.330 6.430 6.530 6.95 7.05 7.15 7.25 7.35 65L 66L 67L 68L 69L 6.5 6.6 6.7 6.8 6.9 6.630 6.730 6.830 6.930 7.030 7.35 7.45 7.55 7.65 7.75 65N 66N 67N 68N 69N 6.5 6.6 6.7 6.8 6.9 6.630 6.730 6.830 6.930 7.030 7.45 7.55 7.65 7.75 7.85 70L 7.0 7.130 7.85 70N 7.0 7.130 7.95 Part No L* in M +0 – 0.03 in E +0.04 –0 in * See 5.3 © BSI The 2009 British Standards Institution 2012 © 13 13 Licensed Copy: Ms Mary Groom, British Standards Institution, 24/05/2012 13:46, Uncontrolled Copy, (c) The British Standards Institution 2012 BS BS 4A 4A 102:2002+A1:2006 102:2002+A2:2012 Table — Bearing length L, clamping length M and overall length E (continued) in UNF in UNF Part No L* in M +0 – 0.03 in E +0.04 –0 Part No L* in in M +0 – 0.03 in in UNF E +0.04 –0 Part No L* in in M +0 – 0.03 in E +0.04 –0 in 1Q 2Q 3Q 4Q 5Q 0.1 0.2 0.3 0.4 0.5 0.241 0.341 0.441 0.541 0.641 1.25 1.35 1.45 1.55 1.65 1S 2S 3S 4S 5S 0.1 0.2 0.3 0.4 0.5 0.255 0.355 0.455 0.555 0.655 1.45 1.55 1.65 1.75 1.85 1U 2U 3U 4U 5U 0.1 0.2 0.3 0.4 0.5 0.273 0.373 0.473 0.573 0.673 1.65 1.75 1.85 1.95 2.05 6Q 7Q 8Q 9Q 10Q 0.6 0.7 0.8 0.9 1.0 0.741 0.841 0.941 1.041 1.141 1.75 1.85 1.95 2.05 2.15 6S 7S 8S 9S 10S 0.6 0.7 0.8 0.9 1.0 0.755 0.855 0.955 1.055 1.155 1.95 2.05 2.15 2.25 2.35 6U 7U 8U 9U 10U 0.6 0.7 0.8 0.9 1.0 0.773 0.873 0.973 1.073 1.173 2.15 2.25 2.35 2.45 2.55 11Q 12Q 13Q 14Q 15Q 1.1 1.2 1.3 1.4 1.5 1.241 1.341 1.441 1.541 1.641 2.25 2.35 2.45 2.55 2.65 11S 12S 13S 14S 15S 1.1 1.2 1.3 1.4 1.5 1.255 1.355 1.455 1.555 1.655 2.45 2.55 2.65 2.75 2.85 11U 12U 13U 14U 15U 1.1 1.2 1.3 1.4 1.5 1.273 1.373 1.473 1.573 1.673 2.65 2.75 2.85 2.95 3.05 16Q 17Q 18Q 19Q 20Q 1.6 1.7 1.8 1.9 2.0 1.741 1.841 1.941 2.041 2.141 2.75 2.85 2.95 3.05 3.15 16S 17S 18S 19S 20S 1.6 1.7 1.8 1.9 2.0 1.755 1.855 1.955 2.055 2.155 2.95 3.05 3.15 3.25 3.35 16U 17U 18U 19U 20U 1.6 1.7 1.8 1.9 2.0 1.773 1.873 1.973 2.073 2.173 3.15 3.25 3.35 3.45 3.55 21Q 22Q 23Q 24Q 25Q 2.1 2.2 2.3 2.4 2.5 2.241 2.341 2.441 2.541 2.641 3.25 3.35 3.45 3.55 3.65 21S 22S 23S 24S 25S 2.1 2.2 2.3 2.4 2.5 2.255 2.355 2.455 2.555 2.655 3.45 3.55 3.65 3.75 3.85 21U 22U 23U 24U 25U 2.1 2.2 2.3 2.4 2.5 2.273 2.373 2.473 2.573 2.673 3.65 3.75 3.85 3.95 4.05 26Q 27Q 28Q 29Q 30Q 2.6 2.7 2.8 2.9 3.0 2.741 2.841 2.941 3.041 3.141 3.75 3.85 3.95 4.05 4.15 26S 27S 28S 29S 30S 2.6 2.7 2.8 2.9 3.0 2.755 2.855 2.955 3.055 3.155 3.95 4.05 4.15 4.25 4.35 26U 27U 28U 29U 30U 2.6 2.7 2.8 2.9 3.0 2.773 2.873 2.973 3.073 3.173 4.15 4.25 4.35 4.45 4.55 * See 5.3 14 © The British Standards Institution © BSI 2012 2009 Licensed Copy: Ms Mary Groom, British Standards Institution, 24/05/2012 13:46, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 4A 102:2002+A2:2012 102:2002+A1:2006 BS Table — Bearing length L, clamping length M and overall length E (continued) in UNF in UNF Part No L* in M +0 – 0.03 in E +0.04 –0 Part No L* in in M +0 – 0.03 in in UNF E +0.04 –0 Part No L* in in M +0 – 0.03 in E +0.04 –0 in 31Q 32Q 33Q 34Q 35Q 3.1 3.2 3.3 3.4 3.5 3.241 3.341 3.441 3.541 3.641 4.25 4.35 4.45 4.55 4.65 31S 32S 33S 34S 35S 3.1 3.2 3.3 3.4 3.5 3.255 3.355 3.455 3.555 3.655 4.45 4.55 4.65 4.75 4.85 31U 32U 33U 34U 35U 3.1 3.2 3.3 3.4 3.5 3.273 3.373 3.473 3.573 3.673 4.65 4.75 4.85 4.95 5.05 36Q 37Q 38Q 39Q 40Q 3.6 3.7 3.8 3.9 4.0 3.741 3.841 3.941 4.041 4.141 4.75 4.85 4.95 5.05 5.15 36S 37S 38S 39S 40S 3.6 3.7 3.8 3.9 4.0 3.755 3.855 3.955 4.055 4.155 4.95 5.05 5.15 5.25 5.35 36U 37U 38U 39U 40U 3.6 3.7 3.8 3.9 4.0 3.773 3.873 3.973 4.073 4.173 5.15 5.25 5.35 5.45 5.55 41Q 42Q 43Q 44Q 45Q 4.1 4.2 4.3 4.4 4.5 4.241 4.341 4.441 4.541 4.641 5.25 5.35 5.45 5.55 5.65 41S 42S 43S 44S 45S 4.1 4.2 4.3 4.4 4.5 4.255 4.355 4.455 4.555 4.655 5.45 5.55 5.65 5.75 5.85 41U 42U 43U 44U 45U 4.1 4.2 4.3 4.4 4.5 4.273 4.363 4.473 4.573 4.673 5.65 5.75 5.85 5.95 6.05 46Q 47Q 48Q 49Q 50Q 4.6 4.7 4.8 4.9 5.0 4.741 4.841 4.941 5.041 5.141 5.75 5.85 5.95 6.05 6.15 46S 47S 48S 49S 50S 4.6 4.7 4.8 4.9 5.0 4.755 4.855 4.955 5.055 5.155 5.95 6.05 6.15 6.25 6.35 46U 47U 48U 49U 50U 4.6 4.7 4.8 4.9 5.0 4.773 4.873 4.973 5.073 5.173 6.15 6.25 6.35 6.45 6.55 51Q 52Q 53Q 54Q 55Q 5.1 5.2 5.3 5.4 5.5 5.241 5.341 5.441 5.541 5.641 6.25 6.35 6.45 6.55 6.65 51S 52S 53S 54S 55S 5.1 5.2 5.3 5.4 5.5 5.255 5.355 5.455 5.555 5.655 6.45 6.55 6.65 6.75 6.85 51U 52U 53U 54U 55U 5.1 5.2 5.3 5.4 5.5 5.273 5.373 5.473 5.573 5.673 6.65 6.75 6.85 6.95 7.05 56Q 57Q 58Q 59Q 60Q 5.6 5.7 5.8 5.9 6.0 5.741 5.841 5.941 6.041 6.141 6.75 6.85 6.95 7.05 7.15 56S 5.6 5.755 6.95 56U 5.6 5.773 7.15 * See 5.3 © BSI The 2009 British Standards Institution 2012 © 15 15 Licensed Copy: Ms Mary Groom, British Standards Institution, 24/05/2012 13:46, Uncontrolled Copy, (c) The British Standards Institution 2012 BS BS 4A 4A 102:2002+A1:2006 102:2002+A2:2012 Table — Bearing length L, clamping length M and overall length E (continued) in UNF L* Part No M +0 – 0.03 in E +0.04 –0 in L* Part No in in M +0 – 0.03 E +0.04 –0 in in 1W 2W 3W 4W 5W 0.1 0.2 0.3 0.4 0.5 0.297 0.397 0.497 0.597 0.697 1.85 1.95 2.05 2.15 2.25 31W 32W 33W 34W 35W 3.1 3.2 3.3 3.4 3.5 3.297 3.397 3.497 3.597 3.697 4.85 4.95 5.05 5.15 5.25 6W 7W 8W 9W 10W 0.6 0.7 0.8 0.9 1.0 0.797 0.897 0.997 1.097 1.197 2.35 2.45 2.55 2.65 2.75 36W 37W 38W 39W 40W 3.6 3.7 3.8 3.9 4.0 3.797 3.897 3.997 4.097 4.197 5.35 5.45 5.55 5.65 5.75 11W 12W 13W 14W 15W 1.1 1.2 1.3 1.4 1.5 1.297 1.397 1.497 1.597 1.697 2.85 2.95 3.05 3.15 3.25 41W 42W 43W 44W 45W 4.1 4.2 4.3 4.4 4.5 4.297 4.397 4.497 4.597 4.697 5.85 5.95 6.05 6.15 6.25 16W 17W 18W 19W 20W 1.6 1.7 1.8 1.9 2.0 1.797 1.897 1.997 2.097 2.197 3.35 3.45 3.55 3.65 3.75 46W 47W 48W 49W 50W 4.6 4.7 4.8 4.9 5.0 4.797 4.897 4.997 5.097 5.197 6.35 6.45 6.55 6.65 6.75 21W 22W 23W 24W 25W 2.1 2.2 2.3 2.4 2.5 2.297 2.397 2.497 2.597 2.697 3.85 3.95 4.05 4.15 4.25 51W 52W 53W 54W 55W 5.1 5.2 5.3 5.4 5.5 5.297 5.397 5.497 5.597 5.697 6.85 6.95 7.05 7.15 7.25 26W 27W 28W 29W 30W 2.6 2.7 2.8 2.9 3.0 2.797 2.897 2.997 3.097 3.197 4.35 4.45 4.55 4.65 4.75 56W 57W 58W 59W 60W 5.6 5.7 5.8 5.9 6.0 5.797 5.897 5.997 6.097 6.197 7.35 7.45 7.55 7.65 7.75 * See 5.3 16 © The British Standards Institution © BSI 2012 2009