BRITISH STANDARD AEROSPACE SERIES BS 4A 104 2002 Amendment No 1 Specification for corrosion resisting steel bolts (Unified hexagons and Unified threads) for aircraft ICS 49 030 20 Li ce ns ed C op y M[.]
Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012 BRITISH STANDARD AEROSPACE SERIES Specification for Specification for corrosion-resisting corrosion-resisting steel bolts steel bolts (Unified (Unified hexagons and hexagons and Unified Unified threads), for strength class threads) aircraft 880 MPa, for aircraft ICS 49.030.20 BS 4A 4A 104:2002 104:2002 BS Amendment No +A2:2012 Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 104:2002 104:2002+A2:2012 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ACE/12, Aerospace fasteners and fastening, upon which the following bodies were 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 the authority under the authority of of the Standards Policy and Strategy the Standards Policy Committee onCommittee 28 January 2002 and Strategy on 28 January 2002 © BSI 2006 © The British Standards Institution 2012 Published by BSI Standards Limited 2012 The The following following BSI BSI references references relate relate to to the the work work on on this this standard: standard: Committee Committee reference reference ACE/12 ACE/12 Draft Draftsfor forcomment comment00/704897 DC 00/704897 DC, 12/30262055 DC ISBN 0978 580 78766 ISBN 5800 33291 Amendments issued since publication Amendments issued since publication Amd No Date Comments Amd No Date Comments 16375 June 2006 Corrections to Table 16375 June 2006 Corrections to Table A2 September 2012 See Foreword Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 104:2002 BS 4A 104:2002+A2:2012 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 Surface 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 2006 British Standards Institution 2012 © ii Licensed Copy: Miss Lucie Licensed Carter, Copy: British Miss Standards Lucie Carter, Institution, British 07/08/2012 Standards Institution, 09:25, Uncontrolled 07/08/2012 Copy, 09:25, (c)Uncontrolled The British Standards Copy, (c) The Institution British2012 Standards Institution 2012 BS BS 4A 4A 104:2002 104:2002+A2:2012 Foreword BS 4A 104:2002 This been prepared TechnicalLimited, Committee ACE/12 It is a This British British Standard Standard has is published by BSIbyStandards under licence from TheofBritish Institution This British Standard has been revision BS 3A Standards 104:1962 which is superseded and withdrawn prepared by Technical ACE/12 It is arequirements revision of BSin3A This revision of BS 3A Committee 104 refers to the relevant BS104:1962 A 100 It which is superseded and withdrawn incorporates amendment of BS 3A 104 and updates and revises material specifications BS 4A 104:2002+A2:2012 supersedes BS 4A 104:2002 (incorporating Amendment No 1), which to is previous withdrawn NOTE Fasteners manufactured editions of this specification may continue to be supplied Foreword until stocks are exhausted The start and finish of text introduced or altered by Amendment No.2 is A British Standard not purportMinor to include all the necessary provisions indicated in the textdoes by tags editorial changes are not tagged of a contract Users of British Standards are responsible for their correct application This British Standard has been prepared by Technical Committee ACE/12 This revision of BS 3A 104 refers to the relevant requirements in BS A 100 It is a Compliance with a British Standard does not confer immunity revision of BS 3A 104:1962 which isthat superseded andofwithdrawn Amendment A2 introduces changes take account ofitself the mechanical properties from legal obligations This revision of BS 3A 104 refers to the relevant requirements in BS A 100 It of high expansion heat-resisting steels In addition amendment A2 introduces incorporates amendment ofmade BS 3A 104high andexpansion updates and revises material a part number code for bolts from heat-resisting steels to specifications distinguish them from bolts made from the other materials (see Clause 9) NOTE Fasteners manufactured to previous editions of this specification may continue to be supplied until stocks are exhausted 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, and 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 © The British Standards Institution © BSI 2012 2006 Summary of pages This document comprises a front cover, and inside front cover, pages i and ii, pages to 16, an inside back cover and a back cover Licensed Licensed Copy:Copy: Miss Miss Lucie Licensed Licensed Lucie Carter, Copy: Carter, Copy: British Miss British Miss Standards Lucie Lucie Standards Carter, Carter, Institution, British Institution, British Standards 07/08/2012 Standards 07/08/2012 Institution, 09:25, Institution, 09:25, Uncontrolled 07/08/2012 Uncontrolled 07/08/2012 Copy, 09:25, 09:25, Copy, (c)Uncontrolled The Uncontrolled (c) British The British Standards Copy, Copy, Standards (c)(c) The Institution The British Institution British 2012 Standards Standards 2012 Institution Institution 2012 2012 BS 4A 104:2002 BS 4A 104:2002 BS 4A 104:2002+A2:2012 Scope Scope BS 4A 104:2002 BS 4Aand 104:2002 This British Standard specifies materials and manufacture, dimensions, protective treatment quality assurance requirements for corrosion-resisting steel hexagondimensions, head bolts with unifiedtreatment threads and tensile This Standard materials protective and This British British Standard specifies specifies materials and and manufacture, manufacture, dimensions, protective treatment andaquality quality strength 880/1 080 MPa assurance for hexagon head bolts with threads and awith tensile assuranceofrequirements requirements for corrosion-resisting corrosion-resisting steel and heat-resisting steelunified hexagon head bolts unifiedThe threads and minimum ofby880 Text deleted. MPa strength of 880/1 080aofMPa NOTE latest edition an Aerospace Series tensile standardstrength is indicated a prefix number NOTE The latest edition of an Aerospace Series standard is indicated by a prefix number Normative references Normative references Scope The following normative documents contain provisions which, through reference in this text, constitute provisions ofStandard this British Standard dated references, subsequent to, ortext, revisions of, any The normative documents contain which, throughamendments reference intreatment this The following following documents in whole orFor in part, are normatively referenced in this document andconstitute are quality This British specifies materials andprovisions manufacture, dimensions, protective and Scope of these publications not apply For undated references, the latest edition of the publication referred to indispensible for its application For dated references, only the edition cited applies For undated provisions of this British Standard For dated references, subsequent amendments to, or revisions any assurance requirements for corrosion-resisting steel hexagon head bolts with unified threads and a of, tensile applies references, the latest edition of the referenced document (including any amendments) applies of these publications not apply For undated references, the latest edition of the publication referred to This British Standard specifies materials and manufacture, dimensions, protective treatment and quality strength of 880/1 080 MPa applies BS A 100, Specification for general requirements for bolts and free running nuts of tensile strength not assurance requirements corrosion-resisting steel hexagon headnumber bolts with unified threads and a tensile NOTE The latest edition of anfor Aerospace Series standard is indicated by a prefix exceeding 249 MPa strength 880/1 080 MPa BS A 100,of1Specification for general requirements for bolts and free running nuts of tensile strength not references exceeding 249edition MPa NOTE TheSpecification latest of for an Aerospace Series standard is corrosion-resisting indicated by a prefix number BSNormative S 80, high chromium-nickel steel forging stock, bars, forgings and 100 mm) parts (880-1 080 MPa, limiting ruling section 10 mm) BS Sfollowing 80, Specification fordocuments high chromium-nickel corrosion-resisting steelreference forging stock, and The normative contain provisions which, through in thisbars, text,forgings constitute Normative references parts (880-1 limiting ruling mm) provisions of080 thisMPa, British Standard Forsection dated 10 references, subsequent amendments to, or revisions of, any BS S 143, Specification for chromium-nickel-copper-molybdenum corrosion-resisting steel (precipitation The normative documents contain provisions which, reference inpublication this constitute hardening) billets, bars, forgings parts (930-1 080 MPa) of publications for not apply.and For undated references, the through latest edition of the referred to BSthese Sfollowing 143, Specification chromium-nickel-copper-molybdenum corrosion-resisting steeltext, (precipitation provisions this British Standard For dated references, subsequent amendments or revisionsof any applies hardening) bars, forgings parts (930-1 080 MPa) BS HR HR 650, Specification for highand expansion heat-resisting steel wire for for the theto, manufacture ofof,bolts, bolts, BS 650,ofbillets, Specification for high expansion heat-resisting steel bar bar and and wire manufacture of these publications not apply For undated references, the latest edition of the publication referred to studs, set screws andnuts nuts (Ni 25.5,expansion Cr15, 15,Ti Ti2, 2,Mn Mn 1.5, Moand 1.25, Sirunning 0.7, 0.3) (Limiting ruling section BS A 100, Specification for general requirements for bolts free nuts of strength studs, set crews and (Ni 25.5, Cr 1.5, Mo 1.25, Si 0.7, 0.3) (Limiting ruling section HR 650, Specification for high heat-resisting steel bar andVVwire for thetensile manufacture ofnot bolts, applies 50 mm) 20 mm) exceeding 249 and MPa.nuts (Ni 25.5, Cr 15, Ti 2, Mn 1.5, Mo 1.25, Si 0.7, V 0.3) (Limiting ruling section studs, set crews BS A 100, Specification forhigh general requirements for bolts and free(X6NiCrTiMoV26-15) running nuts of tensile strength 20 mm) BS S 80, Specification for chromium-nickel steel forging stock, bars, forgings and– BS EN 2398, Aerospace series – Heat resisting corrosion-resisting steel FE-PA2601 – Rm = 900not MPa General requirements exceeding 249 MPa parts (880-1 080 MPa, limiting ruling section 10 mm) Bars for machined bolts – D = 25 mm General requirements BS S 80, Specification high chromium-nickel corrosion-resisting steel forging stock, bars, forgings and Bolts shall conform to for BS Achromium-nickel-copper-molybdenum 100 BS S 143, Specification for corrosion-resisting (precipitation BS EN 2399, Aerospace series – ruling Heat resisting steel FE-PA2601 (X4NiCrTi MoV26-15)steel – Rm ≥ 900 MPa – parts (880-1 080 MPa, limiting section 10 mm) Bolts shall conform to BS A 100 hardening) billets, bars, forgings and parts (930-1 080 MPa) Bars for forged bolts D ≤ 25 mm Materials and–manufacture BS S 143, Specification forfor chromium-nickel-copper-molybdenum corrosion-resisting steel (precipitation BS HR 650, Specification high expansion heat-resisting steel bar and wire for the manufacture of bolts, and manufacture BSMaterials EN ISO billets, 6506-1, Metallic materials – Brinell hardness test – Part 1: Test method hardening) bars, forgings and parts (930-1 080 MPa) studs, crews andbenuts (Ni 25.5, Crby 15, Ti of 2, the Mnfollowing 1.5, Mo 1.25, Si 0.7, V 0.3) (Limiting ruling section 4.1 Thesetbolts shall manufactured one methods: BS HR 650, Specification for materials high expansion steel bar and wiremethod. for the manufacture of bolts, BS mm) EN ISO Metallic Vickers hardness test – Part 1: Test 20 4.1 bolts6507-1, shall be manufactured by–which one ofheat-resisting the following methods: a)The machined drawn one of the British Standards specified in Table 1; studs, set crewsfrom and bright nuts (Ni 25.5, bars Cr 15, Ti 2,conform Mn 1.5,to Mo 1.25, Si 0.7, V 0.3) (Limiting ruling section a) machined from bright drawn bars which conform to one of the British Standards specified General requirements 20b)mm) forged from material which conforms to one of the British Standards specified in Table in Table 1; b) forged from material which conforms to one of the British Standards specified in Table Bolts shall conform to for BSthe A 100 4.2 The material used manufacture of forged bolts shall have the following mechanical properties General requirements in heat-treated condition: 4.2the Thefinally material used for the manufacture of forged bolts shall have the following mechanical properties Materials and Bolts shall conform tomanufacture BS condition: A 100 in the finally heat-treated a) proof stress (min.): 0.2 % 690 MPa; 4.1 The bolts shall be manufacture manufactured by one of the following methods: a) Materials and (min.): 0.2 %to690 MPa; b) proof tensilestress stress: 880 MPa 080 MPa; a) machined from880 bright drawn bars which conform to one of the British Standards specified in Table 1; b) tensile stress: MPa to 080 MPa; 4.1c)The bolts shall be manufactured by one of the following methods: elongation (min.): 12%; b) forged from(min.): material which conforms to one of the British Standards specified in Table c) elongation 12%; a) from bright d) machined Izod impact (min.): 55 drawn J (40 ft.bars lbf).which conform to one of the British Standards specified in Table 1; 4.2d) used for manufacture forged bolts shallStandards have the following Izodmaterial impact (min.): 55the J (40 ft lbf) toofone b)The forged from material which conforms of the British specifiedmechanical in Table properties and tolerances in Dimensions the finally heat-treated condition: andfortolerances 4.2Dimensions The material used the manufacture of forged bolts shall have the following mechanical properties a)All proof stressbolts (min.): 0.2conform % 590 690 MPa; MPa; 5.1 finished shall in the finally heat-treated condition:to the dimensions and tolerances specified in Figure and Table 5.1b)All finished bolts shall conform to theText dimensions and tolerances specified in Figure and Table tensile stress: 880 MPa tobolt 1880 080 MPa; stress (min): MPa deleted.; 5.2a)The clamping length of the shall conform to the dimensions and tolerances specified in Table 2, and proof stress (min.): 0.2 % 690 MPa; shall be clamping such that when12%; aofstandard nut without or ringand gauge is screwed on as in farTable as possible 5.2c)The length the bolt shall conformcountersink to the dimensions tolerances specified 2, and elongation (min.): b) tensile 880 to 080 MPa; by hand, its stress: leading faceMPa within anut distance M from the underside the bolt head The run-out the shall be such that when aisstandard without countersink or ring of gauge is screwed on as far as of possible d) Izod impact (min.): 55 (40 thread shall not(min.): exceed twice theft thread pitch by its leading face is J within albf) distance M from the underside of the bolt head The run-out of the c)hand, elongation 12%; thread shallThis not exceed twice the pitch in BS HR 650, BS EN 2398 and BS EN 2399. NOTE not applicable thethread Dimensions and tolerances Izod impactis length (min.): 55 J to (40 ft.materials lbf) begiven 5.3d) The nominal of the bolt shall the minimum bearing length L, which is determined by the minimum clamping length, M,bolt lessshall two thread (see Table 3) 5.3 The nominal length of the be the pitches minimum bearing length L, which is determined by the 5.1 All finished bolts shall conform to the dimensions and tolerances specified in Figure and Table Dimensions and tolerances minimum clamping length, M, less two3thread pitches (see Table NOTE The bearing lengths L specified in Table are in 0.10 inch increments but3) where a 0.05 length increment is required this should be by agreement between manufacturer and user and should be identified as follows: 8 length B,in indicating a16-32 UNC bolt 5.2 The clamping length of the bolt shall conform to the dimensions and tolerances specified in Table 2, and NOTE The bearing lengths L specified in Table are in 0.10 inch increments but where a 0.05 increment is required this 5.1 All finished bolts shall conform to the dimensions and tolerances specified Figure and Table 2.of bearing length L that 0.85 inches M E need to be adjusted accordingly should be by agreement between manufacturer and user and should be identified as follows: B, indicating bolt of shall be such when a and standard nut without countersink or ring gauge 8is screwed on aas6-32 farUNC as possible bearing 0.85 length inches Ebolt needa todistance be adjusted 5.2 Thelength clamping the shall conform to the dimensions tolerances specified in Table by hand, its Lleading faceMof isand within Maccordingly from the undersideand of the bolt head The run-out of 2, theand Screw threads shall beshall such that when twice a standard nut without thread not exceed the thread pitch countersink or ring gauge is screwed on as far as possible Screwitsthreads by leading is within distance underside of the boltlatest head edition The run-out of the Thehand, bolts shall have face unified screw athreads of M thefrom formthe and fit specified in the of British 5.3 Theshall nominal length twice of thethe boltthread shall be the minimum bearing length L, which is determined by the thread exceed pitch Standard BSnot A have 100 The bolts shall unified screw threads of the form and fit specified in the latest edition of British minimum clamping length, M, less two thread pitches (see Table 3) Standard BS A 100 5.3 The nominal length of the bolt shall be the minimum bearing length L, which is determined by the NOTE The bearing lengths L specified in Table are in 0.10 inch increments but where a 0.05 length increment is required this minimum length,manufacturer M, less twoand thread pitches Table 3) should be by clamping agreement between user and should (see be identified as follows: 8 B, indicating a 6-32 UNC bolt of bearing length L 0.85 inches.LM and E need to be3adjusted accordingly NOTE The bearing lengths 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: 8 B, indicating a 6-32 UNC bolt of © BSI 2006 Screw bearing lengththreads L 0.85 inches M and E need to be adjusted accordingly © BSI The 2006 British Standards Institution 2012 © The bolts shall have unified screw threads of the form and fit specified in the latest edition of British Screw threads Standard BS A 100 11 ucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012 c) elongation (min.): 12%; d) Izod impact (min.): 55 J (40 ft lbf) BS 4A 104:2002+A2:2012 Dimensions and tolerances 5.1 All finished bolts 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 specified 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 is within a distance M from the underside of the bolt head The run-out of the thread shall not exceed twice the thread pitch 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: 8 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 and fit specified in the latest edition of British Standard BS A 100 BS 104:2002 finish 74A Protective There shall be no protective finish applied. © BSI 2006 Hardness values The hardness values of finished bolts shall be as follows in accordance with the BS EN ISO 6506-1 and BS EN ISO 6507-1: a) for machined components: 255 min./321 max HB or 270 min./340 max HV; Surface treatment b) for forged components: 248 min./341 max HB or 260 min./360 max HV. NOTE Surface treatment is not currently applicable Hardness Identification and marking values The hardness values of finished bolts shall be as follows: 9.1 Identification a) 255 min./321 max HB; or Bolts made from material conforming to BS HR 650, BS EN 2398 or BS EN 2399 shall be identified with b) 270 min./340 max HV bolt for machined components; a code “X”, e.g a 4-40 UNC with an “L” dimension and of 0.1 inches and made from one of the three materials above shall be identified as “A104X1A” or for bolts made from material conforming to BS S 80 c) 248 min./341 max HB; or or BS S 143, this shall be identified as “A104-1A” d) 260 min./360 max HV for forged components 9.2 Marking Identification and marking Bolts shall be marked in accordance with BS 4A 100:2003, Clause Bolts for all nominal sizes made frombolts material HR 650, with BS EN or BS ENclause 2399 shall The shallconforming be marked to in BS accordance BS2398 3A 100:1991, be marked with an “X”. 10 Quality assurance procedure The bolts shall conform to the quality requirements specified in BS A 100, as appropriate to the method of manufacture Table — Materials for manufacture of bolts BS No BS No 6S 80 BS S 80 BS143 S 143 2S BS HR HR 650 650 BS EN 2398 BS EN 2399 Material Material Application Application 2 % nickel-chromiumFor the manufacture of machined 1/2% nickel-chromium-molybdenum steel For thebolts manufacture of machined bolts molybdenum steel Chromium-nickel-molybdenum corrosion- For theFor manufacture of machined bolts Chromium-nickel-molybdenum the manufacture of machined resisting steel corrosion-resisting steel bolts High expansion heat-resisting steel For theFor manufacture of forged bolts High expansion heat-resisting steel the manufacture of forged (Nominal size (P) and larger) bolts High expansion heat resisting steel For the manufacture of machined bolts High expansion heat resisting steel For the manufacture of forged bolts © The British Standards Institution 2012 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: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 104:2002 104:2002+A2:2012 © The British Standards Institution © BSI 2012 2006 2 34 45 56 78 9 10 10 11 11 12 1213 13 14 14 15 15 in in in max size A in in max A in in © BSI The 2006 British Standards Institution 2012 © F 0.050 0.300 0.063 0.277 0.063 0.327 0.063 0.377 inin 0.300 0.188 0.277 0.250 0.327 0.312 0.377 0.344 in in Ref only Ref max only F (2 × portion portion pitch) of shankof shank inin max 0.188 0.183 0.250 0.245 0.312 0.307 0.344 0.339 B B 0.183 0.217 0.245 0.289 0.307 0.361 0.339 0.397 in in max C 0.217 0.070 0.289 0.085 0.361 0.100 0.397 0.115 in in max max C in in 0.070 0.060 0.085 0.075 0.100 0.090 0.115 0.105 in in max 0.060 0.015 0.075 0.015 0.090 0.020 0.105 0.020 D max D inin max R 0.015 0.005 0.015 0.005 0.020 0.010 0.020 0.010 R 0.005 0.020 0.005 0.030 0.010 0.030 0.010 0.030 in in max in in max 0.020 0.015 0.030 0.020 0.030 0.020 0.030 0.020 G in 0.015 0.020 0.020 0.020 G This dimension This dimension is an absolute is an absolute minimumminimum associated associated with maximum with maximum length Mlength and minimum M and minimum length E.length It is not E intended It is not intended for use for formanufacturing use for manufacturing or inspection or inspection purposes.purposes * For bearing * Forlength bearing L,length clamping L, clamping length Mlength and overall M andlength overall E length see Table E see Table 1.00-121.0000 UNF 1.000-12 1.000-12 UNF (W) UNF (W) 1.0000 0.9995 0.9995 0.9955 0.9955 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 5/8-18 UNF 0.625-18 0.625-18 UNF (Q) UNF (Q) 0.6250 0.6250 0.6245 0.6245 0.6205 0.6205 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 3/4-16 UNF 0.750-16 0.750-16 UNF (S) UNF (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 7/8-14 UNF 0.875-14 0.875-14 UNF (U) UNF (U) 0.8750 0.8750 0.8745 0.8745 0.8705 0.8705 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 7/16-20 UNF 0.4375-20 0.4375-20 UNF (L) UNF0.4375 (L) 0.4375 0.4370 0.4370 0.4335 0.4335 0.100 0.100 0.670 0.670 0.688 0.688 0.679 0.679 0.794 0.794 0.270 0.270 0.260 0.260 0.030 0.030 0.015 0.015 0.050 0.050 0.040 0.040 1/2-20 UNF 0.500-20 0.500-20 UNF (N) UNF (N) 0.5000 0.5000 0.4995 0.4995 0.4960 0.4960 0.100 0.100 0.770 0.770 0.750 0.750 0.741 0.741 0.866 0.866 0.300 0.300 0.290 0.290 0.030 0.030 0.015 0.015 0.050 0.050 0.040 0.040 9/16-18 UNF 0.5625-18 0.5625-18 UNF (P) UNF0.5625 (P) 0.5625 0.5620 0.5620 0.5585 0.5585 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 1/4-28 UNF 0.250-28 0.250-28 UNF (E) UNF (E) 0.2500 0.2500 0.2495 0.2495 0.2465 0.2465 0.071 0.071 0.459 0.459 0.438 0.438 0.431 0.431 0.505 0.505 0.150 0.150 0.140 0.140 0.030 0.030 0.015 0.015 0.040 0.040 0.030 0.030 5/16-24 UNF 0.3125-24 0.3125-24 UNF (G) UNF0.3125 (G) 0.3125 0.3120 0.3120 0.3090 0.3090 0.083 0.083 0.497 0.497 0.500 0.500 0.493 0.493 0.577 0.577 0.180 0.180 0.170 0.170 0.030 0.030 0.015 0.015 0.040 0.040 0.030 0.030 3/8-24 UNF 0.375-24 0.375-24 UNF (J) UNF (J) 0.3750 0.3750 0.3745 0.3745 0.3715 0.3715 0.083 0.083 0.597 0.597 0.562 0.562 0.554 0.554 0.650 0.650 0.220 0.220 0.210 0.210 0.030 0.030 0.015 0.015 0.040 0.040 0.030 0.030 0.112-40 0.112-40 UNC (4) UNC (4) 0.1120 0.1115 0.1115 0.1085 0.1085 0.050 4-400.1120 UNC 0.138-32 0.138-32 UNC (6) UNC (6) 0.1380 0.1380 0.1375 0.1375 0.1345 0.1345 0.063 6-32 UNC 0.164-32 0.164-32 UNC (8) UNC (8) 0.1640 0.1640 0.1635 0.1635 0.1605 0.1605 0.063 8-32 UNC 0.190-32 0.190-32 UNF (10) UNF (10) 0.1900 0.1900 0.1895 0.1895 0.1865 0.1865 0.063 10-32 UNF © BSI 2006 size Nominal NominalNominal thread size Alternative Width across Widthflats across Width flats Width Thickness Thickness of head ofRadius head under Radius bolt under bolt Depth ofDepth of Min Diameter Diameter of 2of 2Min size Decimal Decimal size thread across across length plain portion plain portion of pitch of Thread equivalent equivalent heat heat chamferchamfer pitch oflength of shank shank runout screwedscrewed of reference nominal of nominal corners corners Table 2Table — Dimensions — Dimensions of bolts of bolts Licensed Licensed Copy: Miss Copy: Lucie MissCarter, Lucie Carter, British Standards British Standards Institution, Institution, 07/08/2012 07/08/2012 09:25, Uncontrolled 09:25, Uncontrolled Copy, (c) Copy, The (c) British The Standards British Standards Institution Institution 2012 2012 BS 4A 104:2002 BS 4A 104:2002 BS 4A 104:2002+A2:2012 5 b) M M E Figure — Bearing length L, clamping length M and overall length E (see Table 3) a) L L E Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 104:2002 104:2002+A2:2012 © The British Standards Institution © BSI 2012 2006 © BSI The 2006 British 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* 2.693 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 6-32 UNC 3.00 3.10 3.20 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 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 0.130 0.180 0.280 0.380 0.480 0.580 in 0.05 0.1 0.2 0.3 0.4 0.5 M +0 – 0.03 L* A 1A 2A 3A 4A 5A Part No No 4-40 UNC 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: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 104:2002 BS 4A 104:2002+A2:2012 77 Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 104:2002 104:2002+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 © The British Standards Institution © BSI2012 2006 Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 104:2002 BS 4A 104:2002+A2:2012 Table — Bearing length L, clamping length M and overall length E (continued) in UNF Part No L* in E 1E 2E 3E 4E 5E 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 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 2006 British Standards Institution 2012 © Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 104:2002 104:2002+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 2006 Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 104:2002 BS 4A 104:2002+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 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 11L 12L 13L 14L 15L 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 0.730 0.830 0.930 1.030 1.130 1.230 1.330 1.430 1.530 1.630 1.45 1.55 1.65 1.75 1.85 1.95 2.05 2.15 2.25 2.35 6N 7N 8N 9N 10N 11N 12N 13N 14N 15N 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 0.730 0.830 0.930 1.030 1.130 1.230 1.330 1.430 1.530 1.630 1.55 1.65 1.75 1.85 1.95 2.05 2.15 2.25 2.35 2.45 6P 7P 8P 9P 10P 11P 12P 13P 14P 15P 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 0.741 0.841 0.941 1.041 1.141 1.241 1.341 1.441 1.541 1.641 1.65 1.75 1.85 1.95 2.05 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 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 * See 5.3 © BSI The 2006 British Standards Institution 2012 © 11 11 Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 104:2002 104:2002+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 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 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 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 2006 Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 104:2002 BS 4A 104:2002+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 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 * See 5.3 © BSI The 2006 British Standards Institution 2012 © 13 Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 104:2002 104:2002+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 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 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 4.373 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 * See 5.3 14 © The British Standards Institution © BSI 2012 2006 Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 104:2002 BS 4A 104:2002+A2:2012 Table — Bearing length L, clamping length M and overall length E (continued) in UNF Part No L* in 56Q 57Q 58Q 59Q 60Q 5.6 5.7 5.8 5.9 6.0 M +0 – 0.03 in 5.741 5.841 5.941 6.041 6.141 in UNF E +0.04 –0 Part No in 6.75 6.85 6.95 7.05 7.15 L* in 56S 5.6 M +0 – 0.03 in 5.755 in UNF E +0.04 –0 Part No L* in 6.95 in 56U 5.6 M +0 – 0.03 in 5.773 E +0.04 –0 in 7.15 * See 5.3 © BSI The 2006 British Standards Institution 2012 © 15 15 Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 104:2002 104:2002+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 2006 Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 4A 104:2002 104:2002 BS +A2:2012 BSI — British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions It is the constant aim of BSI to improve the quality of our products and services We would be grateful if anyone finding an inaccuracy or ambiguity while using this 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