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Licensed Copy: Miss Anne Carty, British Standards Institution, 19/01/2012 15:56, Uncontrolled Copy, (c) The British Standards Institution 2012 BRITISH STANDARD AEROSPACE SERIES Specification for aluminium alloy, mushroom-headed, slotted drive, bolts (unified thread) ICS 49.030.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BS BS4A 4A170:1999 170:1999 +A1:2012 Licensed Copy: Miss Anne Carty, British Standards Institution, 19/01/2012 15:56, Uncontrolled Copy, (c) The British Standards Institution 2012 BS BS 4A 4A 170:1999 170:1999+A1:2012 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ACE/12, Aerospace fasteners and fastening systems, upon which the following bodies were represented: Civil Aviation Authority (Airworthiness Division) Confederation of British Forgers Ministry of Defence Society of British Aerospace Companies Limited Co-opted member This British Standard, having been prepared under the direction of the Engineering These Committee, British Standards, Sector was published having been prepared under under the authority of the the direction of the Engineering Standards Committee and comes Sector Committee, into effect on 15 Junewas 1999 published under the authority of the Standards Committee and comes into effect on BSI 06-1999 15 June 1999 © The British Standards Institution 2012 Published by BSI Limited 2012 The following BSI references relate to the work on this The following BSI references standard: relate to the work on this Committee reference ACE/12 standard: Draft for comment 98/706176 Committee reference ACE/12 DC 12/30254205 Draft for comment 98/706176 DC DC ISBN 580028286 ISBN0978 580 76867 Amendments issued since publication Amd No Date Comments Amendments issued since publication Amd No Date Comments A1 July 2012 See foreword Licensed Copy: Miss Anne Carty, British Standards Institution, 19/01/2012 15:56, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 170:1999 BS 4A 170:1999+A1:2012 Contents Page Committees responsible Inside front cover Foreword ii Scope Normative references General requirements Materials and manufacture Dimensions and tolerances Screw threads Protective Anti-corrosion treatment finish Hardness values Identifying and marking 10 Quality assurance procedure Figure Ð Dimensions of bolts Figure Ð Bearing length L, clamping length M and overall length E Table Ð Dimensions of bolts Table Ð Bearing length L, clamping length M and overall length E © The British Standards Institution 2012 BSI 06-1999 i i BS BS 4A 4A 170:1999 170:1999+A1:2012 Licensed Copy: Miss Anne Carty, British Standards Institution, 19/01/2012 15:56, Uncontrolled Copy, (c) The British Standards Institution 2012 Foreword This British hasisbeen prepared Technical Committee ACE/12 This BritishStandard Standard published byby BSI Standards Limited, underItlicence supersedes BS 3A 170:1962 which is withdrawn from The British Standards Institution This British of Standard been prepared byrequirements Technical Committee This revision BS A 170has refers to the relevant in BS A 100.ACE/12 It BS 4A 170:1999+A1:2012 incorporates amendment supersedes BS 4A 170:1999, which is withdrawn The startStandard and finish of not textpurport introduced or altered Amendment No 1ofisa A British does to include all theby necessary provisions indicated in the by Standards tags and Minor editorial are not tagged contract Users oftext British are responsible for theirchanges correct application This revisionwith of BSaABritish 170 refers to the relevant in BS A 100 Compliance Standard does notrequirements of itself confer immunity from legal obligations 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 and a back cover ii ii © The British Standards Institution 2012 BSI 06-1999 Licensed Copy: Miss Anne Carty, British Standards In icensed Licensed Copy: Licensed Copy: Miss Miss Anne Copy: Licensed Anne Carty, Miss Carty, Anne British Copy: British Carty, Miss Standards Standards British Anne Institution, Carty, Standards Institution, British 19/01/2012 Institution, Standards 19/01/2012 15:56, 19/01/2012 Institution, 15:56, Uncontrolled Uncontrolled 15:56, 19/01/2012 Uncontrolled Copy, Copy, 15:56, (c) The (c)Uncontrolled Copy, The British British (c) Standards The Standards Copy, British (c) Institution Standards The Institution British 2012 Institution 2012 Standards 2012 Institution 2012 Scope This British Standard specifies materials and manufacture, dimensions, protective treatment and quality assurance requirements for aluminium alloy, mushroom-headed, slotted, drive bolts with unified Scope threads This British Standard materials and is NOTE The latest edition of specifies an Aerospace Series standard indicated by a prefix number protective treatment and manufacture, dimensions, quality assurance requirements for aluminium alloy, Scope mushroom-headed, slotted, drive bolts with unified references Normative Scope This British Standard specifies materials and threads manufacture, dimensions, protective treatment and The following normative documents contain The following documents, inmaterials whole orand in part, This British Standard NOTE The latest edition of specifies an Aerospace standard is quality assurance requirements forSeries aluminium alloy, are normatively referenced in this document provisions which, through reference in this text, manufacture, dimensions, protective treatment and indicated by a prefix number mushroom-headed, slotted, drive withFor unified and areassurance indispensable its application constitute provisions offor this British Standard For quality requirements forbolts aluminium alloy, threads dated references, subsequent only the edition citedwith applies dated references, amendments to, or mushroom-headed, slotted, drive bolts unified Normative references For undated references, the latest edition of the NOTE The latest edition of an Aerospace Series standard is revisions of, any of these publications not apply threads indicated by a document prefix number referenced (including any amendments) For undated references, the latest edition the of The following normative documents contain NOTE The latest edition of an Aerospace Series standard is applies publication referred to applies indicated by awhich, prefix number provisions through reference in this text, constitute provisions of Specification this British Standard For BSNormative 3A 100:1991, Specification for general references BS 4A 100:2003, for general dated references, subsequent amendments to, or requirements for bolts and free running nuts Normative references The following normative documents contain of revisions of, anynot of these publications not apply tensile strength exceeding 249 MPa provisions which, throughdocuments reference in this text, The following normative contain For undated references, the latest edition of the BS L 168:1978, Specification for barsStandard constitute provisions of this British For provisions which, through reference inand thisextruded text, publication referred to applies sections of aluminium-copper-magnesium-silicondated references, subsequent amendments to, or constitute provisions of this British Standard For BS 3A 100:1991, Specification for general manganese alloy (solution treated and artificially revisions of, any of these publications not apply dated references, subsequent amendments to, or requirements for bolts200 andmm free running nuts of aged) (notof,exceeding diameter For undated references, latest edition ofminor the revisions any of thesethe publications doornot apply tensile strength not exceeding 1Mg 249 MPa sectional dimension) (Cu 4.4, 0.5, Si 0.7, publication referred to applies For undated references, the latest edition of the MnL 0.8) BS 168:1978, Specification for and extruded BS 3A 100:1991, Specification forbars general publication referred to applies sections of aluminium-copper-magnesium-siliconBS 1580-1 Unified screw threads – Partnuts 1: of BS 1580, Specification for unified screw threads requirements forSpecification bolts and free BS 3A 100:1991, forrunning general manganese alloy (solution treated and artificially Screw threads with diameters ¼ in and larger –of tensile strength not exceeding 249 MPa BS 1580-1 andfor -2:1962, ï in and requirements bolts Diameters and free running nutslarger aged) (not exceeding 200 mm diameter or minor Requirements BS L 168:1978, barsMPa and extruded tensile strengthSpecification not exceedingfor 249 sectional dimension) (Cu 4.4, Mg 0.5, Si 0.7, sections of Unified aluminium-copper-magnesium-siliconBS 1580-3, screw threads – Part 3: extruded Screw BS L 168:1978, Specification for bars and Mn 0.8) General requirements manganese alloy (solution treated artificially threads diameters below ¼ in –and Requirements sectionswith of aluminium-copper-magnesium-siliconBS 1580, Specification formm unified screwor threads Bolts shall conform to200 BS A 100 aged) (not exceeding diameter minor manganese (solution treated and artificially BS EN 2284,alloy Specification for sulfuric acid anodizing sectional dimension) (Cu 4.4, Mg 0.5, Si 0.7, BS 1580-1 and -2:1962, Diameters ï in and larger aged) (not exceeding 200 mm diameteralloys. or minor of aluminium and wrought aluminium Mn 0.8) sectional dimension) (Cu 4.4, Mg 0.5, Si 0.7, Materials and manufacture BS 1580, for unified screw threads Mn 0.8) General The boltsSpecification shallrequirements be machined from bars that conform BS 1580-1 and -2:1962, Diameters ï in and larger 1580, Specification for unified screw threads to L168 4A 100:2003 Bolts shall conform to BS BS A 100 BS 1580-1 and -2:1962, Diameters ï in and larger Dimensions and tolerances General Materialsrequirements and manufacture General requirements Bolts shall conform to BS A conform 100 The shall bebolts, machined from barstothat 5.1 bolts All finished shall the conform Bolts shallL conform to BS Agiven 100 in Tables and to L168 BS 168 dimensions and tolerances and manufacture 5.2Materials The clamping length of the bolt shall conform to and manufacture The bolts shall be machined from bars conform Materials Dimensions and tolerances the dimensions and tolerances given in that Table and to L168 shall be such when a standard nutthat without The bolts shallthat, bebolts, machined from bars 5.1 All finished shall conform to the conform countersink or ring gauge without countersunk has to L168 dimensions and given in by Tables and been screwed ontolerances as far as possible hand, its Dimensions and tolerances leading is within distance from the conform underside 5.2 Theface clamping length of theMbolt shall to Dimensions and tolerances of the head.and Thetolerances runout of given the thread not 5.1 Allbolt finished bolts, shall conform to Table theshall the dimensions in and exceed thetolerances pitch dimensions given in Tables and shall betwice suchand that, when a standard nut without 5.1 All finished bolts, shall conform to the countersink or ring gauge without countersunk dimensions and tolerances in Tables andhas to 5.2 The clamping length ofgiven the bolt shall conform been screwed on as far as possible by hand, its the dimensions and tolerances given in Table and 5.2 Theface clamping length of theMbolt shall to leading is within distance from the conform underside shall be such that, when a standard nut without the dimensions in Table and of the bolt head.and Thetolerances runout of given the thread shall not countersink ringwhen gaugea without shall betwice suchorthat, standardcountersunk nut withouthas exceed the pitch been screwed on as far as possible by hand, its has countersink or ring gauge without countersunk leading face is within distance M from the underside been screwed on as far as possible by hand, its of the bolt head The runout of the thread not leading face is within distance M from the shall underside exceed twice the The pitch of the bolt head runout of the thread shall not © The British Institution 2012 exceed twiceStandards the pitch BSI 06-1999 Bolts shall conform to BS A 100 Materials andBS manufacture BS 4A 170:1999 4A 170:1999+A1:2012 The bolts shall be machined from bars that conform to L168 Dimensions and tolerances BS 4A 170:1999 5.1 All finished bolts, shall conform to the dimensions and tolerances given in Tables and BSshall 4A be 170:1999 5.2 The nominal clampinglength lengthofofthe thebolt bolt shall conform to 5.3 the the dimensions and tolerances given Table and shall be 2the minimum bearing length Lmin., which BS in 4A 170:1999 shall be such that, when a standard without two thread minimum clamping length, Mmin., lessnut countersink or ring gauge without countersunk has pitches been screwed onlengths as farL as possible hand, itsinch NOTE The bearing quoted in Tableby are in 0.10 increments but where alength 0.05distance length increment is required this is leading is within M from thebeunderside 5.3 Theface nominal of the bolt shall the permissible agreement between manufacturer and user and of the boltby head The runout of the thread shall not , which shall be the minimum bearing length Lmin should be identified as follows: ¯B, indicating a 6-32 UNC bolt of exceed twice the pitch , less thread minimum clamping bearing length 0.85 incheslength, L, M andMEmin should be two adjusted pitches accordingly 5.3 The nominal length of the bolt shall be the NOTE The bearing L quoted Table 2shall are in be 0.10the inch ,inwhich minimum bearinglengths length Lmin 5.3 The nominal of the bolt shall be the increments but where alength 0.05 length increment is required this is , less shall two minimum clamping length, Mmanufacturer Screwby threads permissible agreement between and thread user and , which be the minimum bearing length Lmin pitches should be identified as follows: ¯B, indicating a 6-32thread UNC bolt of two minimum clamping length, Mscrew The bolts shall have unified threads of the min., less bearing length 0.85 inches L, LMquoted and E in should be adjusted NOTE The bearing lengths Table are inof 0.10 inch pitches form and fit specified in the latest edition accordingly increments but where a 0.05 length increment is required this is NOTE The by bearing lengths L quoted in Table are 0.10 and inch BS A 100 permissible agreement between manufacturer andinuser increments but where 0.05 length increment is required thisbolt is of should be identified asafollows: ¯B, indicating a 6-32 UNC permissible by 0.85 agreement and user and Screw threads bearing length inches between L, M and manufacturer E should be adjusted should be identified as follows: ¯B, indicating a 6-32 UNC bolt of Anti-corrosion treatment accordingly The shall have unified of the bearing length 0.85 inches L, M and screw E shouldthreads be adjusted BSIbolts 06-1999 All finished shallinbethe anodized and dyed accordingly form and fit bolts specified latest edition of green NOTE Because of the use of the chromic acid process for BS A 100 Screw threads anodizing, the bolts will not necessarily be uniformly coloured Screw threads The bolts shall have unified screw threads of the after staining form and fit specified intreatment the screw latest of BS 4A edition 100:2003 Anti-corrosion The bolts shall have unified threads of the BS A 100 form and fit specified in the latest edition of All finished bolts shall be anodized and dyed green Hardness values BS A 100 NOTE Because the use ofnot thecurrently chromic applicable, acid process for they NOTE Hardnessofvalues are though Protective finish anodizing, the bolts will not necessarily be uniformly coloured mayAnti-corrosion become applicable in thetreatment near future afterfinished staining bolts shall be sulphuric acid anodized, All treatment AllAnti-corrosion finished bolts shall be anodized and dyed green coloured green and sealed in pure water in NOTE Because of the use of the chromic acid process for Identifying and marking All finished with boltsBS shall be2284:1991, anodized and dyed green accordance EN Type BC Hardness values anodizing, the bolts will not necessarily be uniformly coloured NOTE Because of the use of the chromic acid process for The bolts shall be identified in accordance with the after NOTE Bolts arevalues not always uniformly coloured after dyeing NOTEstaining Hardness are necessarily not currently applicable, though they anodizing, the bolts will not be uniformly coloured requirements specified in BS 3A 100:1991 clause due to the sulphuric acid anodizing process may become applicable in the near future after staining Hardness values 10 Quality assurance procedure and marking NOTE Hardness values are not currently applicable, though they Identifying Hardness values may become applicable in the near future The bolts shall conform to the requirements The shall be identified in quality accordance with the NOTEbolts Hardness values are not currently applicable, though they specified in BS A 100, as appropriate to method may become applicable in theinnear requirements specified BSfuture 3A 100:1991the clause of manufacture Identifying and marking Identifying and marking The bolts shall assurance be identified inprocedure accordance with the 10 Quality requirements intoBS 3Aquality 100:1991 clause The bolts shallspecified be identified in accordance with the conform the requirements BS 4A 100:2003 requirements specified in appropriate BS 3A 100:1991 clause specified in BS A 100, as to the method of 10manufacture Quality assurance procedure 10 The Quality bolts shall assurance conform to theprocedure quality requirements specified in BS A 100, as appropriate the method The bolts shall conform to the qualitytorequirements of manufacture specified in in BS A 100, appropriateas toappropriate the method specified BS 4A as 100:2003, to method of manufacture of the manufacture 1 The spe of m Licensed Copy: Miss Anne Carty, British Standards Institution, 19/01/2012 15:56, Uncontrolled Copy, (c) The British Standards Institution 2012 BS BS 4A 4A 170:1999 170:1999+A1:2012 Max runout of thread = x pitch D F (for ref only) L* (bearing length) B R rad 45 ° H A U rad J C M* (clamping length) G E* (overall length) Figure Ð Dimensions of bolts * For bearing length L, clamping length M and overall length E see Table L M E Figure Ð Bearing length L, clamping length M and overall length E 22 BSI 06-1999 © The British Standards Institution 2012 © The British Standards Institution 2012 BSI 06-1999 0.189 0.249 0.312 0.190-32 UNF No 10-32UNF UNF 10–32 0.190 1/ in 0.250-28 UNF UNF 1/4–28 UNF 0.250 5/ 0.3125-24 UNF UNF UNF 5/16–24 0.312 16 in 0.309 0.246 0.186 0.160 0.134 in in 0.083 0.071 0.063 0.063 0.063 0.497 0.459 0.377 0.327 0.277 in min ref ref only Fa 0.690 0.565 0.441 0.378 0.316 in max B 0.666 0.546 0.425 0.364 0.303 in 0.183 0.150 0.118 0.102 0.086 in max D 0.162 0.133 0.103 0.088 0.074 in Thickness of head 0.030 0.025 0.020 0.015 0.010 in approx C Cylindrical portion of head 0.474 0.389 0.304 0.255 0.205 in ref only U Radius of head 0.030 0.030 0.020 0.020 0.015 in max in 0.015 0.015 0.010 0.010 0.005 R Radius under bolt head in 0.040 0.040 0.030 0.030 0.030 G 0.030 0.030 0.020 0.020 0.020 in Depth of chamfer max a This dimension is an absolute minimum associated with maximum length M and minimum length E It is not intended for use for manufacturing or inspection purposes b To be measured from the top of the head to the point at which the slot breaks through see Figure 0.163 0.164-32 UNC0 No 8-32 UNCUNC 8–320.164 in max A Diameter of head Table Ð Dimensions of bolts Diameter of plain Thread 23 Min length portion of shank pitch of screwed runout portion of (2 × shank pitch) 0.137 in Nominal Decimal equivalent thread size of nominal size 0.138-32 UNC0 No 6-32 UNCUNC 6–320.138 Decimal Nominal size nominal thread size 0.072 0.064 0.050 0.045 0.039 in H 0.084 0.075 0.060 0.054 0.048 in max Width in 0.090 0.073 0.055 0.046 0.038 0.100 0.083 0.065 0.056 0.048 in max Jb Depth Slot Licensed Copy: Miss Anne Carty, British Standards Institution, 19/01/2012 15:56, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 170:1999 BS 4A 170:1999+A1:2012 3 Licensed Copy: Miss Anne Carty, British Standards Institution, 19/01/2012 15:56, Uncontrolled Copy, (c) The British Standards Institution 2012 Licensed Copy: Miss Anne Carty, British Standards Institution, 19/01/2012 15:56, Uncontrolled Copy, (c) The British Standards Institution 2012 Licensed Copy: Miss Anne Carty, British Standards Institution, 19/01/2012 15:56, Uncontrolled Copy, (c) The British Standards Institution 2012 Licensed Copy: Miss Anne Carty, British Standards Institution, 19/01/2012 15:56, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 170:1999 BS 4A 170:1999 BS BS 4A 4A 170:1999 170:1999 BS 4A 170:1999+A1:2012 Table 2Ð Bearing length L,L,L, clamping length MMM and overall length EE(continued) Table 22Ð Bearing length clamping length overall length E Table Table Table 2Ð Ð Ð Bearing Bearing Bearing length length length L, L, clamping clamping clamping length length length Mand Mand and and overall overall overall length length length E(continued) E(continued) (continued) (continued) No 6-32 UNC No 6-32 UNC No No No 6-32 6-32 6-32 UNC UNC UNC No 8-32 UNC No 8-32 UNC No No No 8-32 8-32 8-32 UNC UNC UNC No 10-32 UNF No 10-32 UNF No No No 10-32 10-32 10-32 UNF UNF UNF Part no MMM E EE no MMM E EE no MMM E EE Part no Part no Part no Part Part Part no no no aLaLaaL LaL MM E E Part Part Part Part no no no aLaLaaL LaL MM E E Part Part Part Part no no no aLaLaaL LaL MM EE +0+0+0 +0.04 +0+0+0 +0.04 +0.04 +0.04 +0.04 +0.04 min +0+0 +0.04 +0.04 min +0+0 +0.04 +0.04 +0.04 +0.04 +0.04 min.+0+0+0 +0+0 +0.04 +0.04 20.03 20.03 20.03 20.03 20 20.03 20 20.03 20 20.03 20 20.03 20 20.03 20.03 20 20 20 20.03 20.03 20 20 20 20.03 20.03 20.03 20 20 20 20 ininin inin ¯¯B ¯ B 0.05 ¯B ¯ BB 0.05 0.05 0.05 0.05 1B11BB 0.1 0.1 1BB 0.1 0.1 0.1 2B22BB 0.2 0.2 2BB 0.2 0.2 0.2 3B33BB 0.3 0.3 3BB 0.3 0.3 0.3 4B44BB 0.4 0.4 4BB 0.4 0.4 0.4 5B55BB 0.5 0.5 5BB 0.5 0.5 0.5 ininin inin ininin inin 0.143 0.143 0.45 0.143 0.143 0.1430.45 0.45 0.45 0.45 0.193 0.193 0.50 0.193 0.50 0.193 0.1930.50 0.50 0.50 0.293 0.293 0.60 0.293 0.60 0.293 0.2930.60 0.60 0.60 0.393 0.393 0.70 0.393 0.70 0.393 0.3930.70 0.70 0.70 0.493 0.493 0.80 0.493 0.80 0.493 0.4930.80 0.80 0.80 0.593 0.593 0.90 0.593 0.90 0.593 0.5930.90 0.90 0.90 ininin inin ¯¯C ¯ C 0.05 ¯C ¯ CC 0.05 0.05 0.05 0.05 1C11CC 0.1 0.1 1CC 0.1 0.1 0.1 2C22CC 0.2 0.2 2CC 0.2 0.2 0.2 3C33CC 0.3 0.3 3CC 0.3 0.3 0.3 4C44CC 0.4 0.4 4CC 0.4 0.4 0.4 5C55CC 0.5 0.5 5CC 0.5 0.5 0.5 ininin inin ininin inin 0.143 0.143 0.50 0.143 0.143 0.1430.50 0.50 0.50 0.50 0.193 0.193 0.55 0.193 0.55 0.193 0.1930.55 0.55 0.55 0.293 0.293 0.65 0.293 0.65 0.293 0.2930.65 0.65 0.65 0.393 0.393 0.75 0.393 0.75 0.393 0.3930.75 0.75 0.75 0.493 0.493 0.85 0.493 0.85 0.493 0.4930.85 0.85 0.85 0.593 0.593 0.95 0.593 0.95 0.593 0.5930.95 0.95 0.95 ininin inin ¯¯D ¯ D 0.05 ¯D ¯ DD 0.05 0.05 0.05 0.05 1D11DD 0.1 0.1 1DD 0.1 0.1 0.1 2D22DD 0.2 0.2 2DD 0.2 0.2 0.2 3D33DD 0.3 0.3 3DD 0.3 0.3 0.3 4D44DD 0.4 0.4 4DD 0.4 0.4 0.4 5D55DD 0.5 0.5 5DD 0.5 0.5 0.5 ininin inin ininin inin 0.143 0.143 0.55 0.143 0.143 0.1430.55 0.55 0.55 0.55 0.193 0.193 0.60 0.193 0.60 0.193 0.1930.60 0.60 0.60 0.293 0.293 0.70 0.293 0.70 0.293 0.2930.70 0.70 0.70 0.393 0.393 0.80 0.393 0.80 0.393 0.3930.80 0.80 0.80 0.493 0.493 0.90 0.493 0.90 0.493 0.4930.90 0.90 0.90 0.593 0.593 1.00 0.593 1.00 0.593 0.5931.00 1.00 1.00 6B66BB 0.6 6BB 0.6 0.6 0.6 0.6 7B77BB 0.7 7BB 0.7 0.7 0.7 0.7 8B88BB 0.8 8BB 0.8 0.8 0.8 0.8 9B99BB 0.9 9BB 0.9 0.9 0.9 0.9 101010 B B 1.0 10 1.0 1.0 10B BB 1.0 1.0 0.693 0.693 1.00 0.693 0.6931.00 1.00 1.00 0.693 1.00 0.793 0.793 1.10 0.793 0.7931.10 1.10 1.10 0.793 1.10 0.893 0.893 1.20 0.893 0.8931.20 1.20 1.20 0.893 1.20 0.993 0.993 1.30 0.993 0.9931.30 1.30 1.30 0.993 1.30 1.093 1.093 1.40 1.093 1.0931.40 1.40 1.40 1.093 1.40 6C66CC 0.6 6CC 0.6 0.6 0.6 0.6 7C77CC 0.7 7CC 0.7 0.7 0.7 0.7 8C88CC 0.8 8CC 0.8 0.8 0.8 0.8 9C99CC 0.9 9CC 0.9 0.9 0.9 0.9 101010 C C 1.0 10 1.0 1.0 10C CC 1.0 1.0 0.693 0.693 1.05 0.693 0.6931.05 1.05 1.05 0.693 1.05 0.793 0.793 1.15 0.793 0.7931.15 1.15 1.15 0.793 1.15 0.893 0.893 1.25 0.893 0.8931.25 1.25 1.25 0.893 1.25 0.993 0.993 1.35 0.993 0.9931.35 1.35 1.35 0.993 1.35 1.093 1.093 1.45 1.093 1.0931.45 1.45 1.45 1.093 1.45 6D66DD 0.6 6DD 0.6 0.6 0.6 0.6 7D77DD 0.7 7DD 0.7 0.7 0.7 0.7 8D88DD 0.8 8DD 0.8 0.8 0.8 0.8 9D99DD 0.9 9DD 0.9 0.9 0.9 0.9 101010 D D 1.0 10 1.0 1.0 10D DD 1.0 1.0 0.693 0.693 1.10 0.693 0.6931.10 1.10 1.10 0.693 1.10 0.793 0.793 1.20 0.793 0.7931.20 1.20 1.20 0.793 1.20 0.893 0.893 1.30 0.893 0.8931.30 1.30 1.30 0.893 1.30 0.993 0.993 1.40 0.993 0.9931.40 1.40 1.40 0.993 1.40 1.093 1.093 1.50 1.093 1.0931.50 1.50 1.50 1.093 1.50 111111 B B 1.1 11 1.1 1.1 11B BB 1.1 1.1 121212 B B 1.2 12 1.2 1.2 12B BB 1.2 1.2 131313 B B 1.3 13 1.3 1.3 13B BB 1.3 1.3 141414 B B 1.4 14 1.4 1.4 14B BB 1.4 1.4 151515 B B 1.5 15 1.5 1.5 15B BB 1.5 1.5 1.193 1.193 1.50 1.193 1.1931.50 1.50 1.50 1.193 1.50 1.293 1.293 1.60 1.293 1.2931.60 1.60 1.60 1.293 1.60 1.393 1.393 1.70 1.393 1.3931.70 1.70 1.70 1.393 1.70 1.493 1.493 1.80 1.493 1.4931.80 1.80 1.80 1.493 1.80 1.593 1.593 1.90 1.593 1.5931.90 1.90 1.90 1.593 1.90 111111 C C 1.1 11 1.1 1.1 11C CC 1.1 1.1 121212 C C 1.2 12 1.2 1.2 12C CC 1.2 1.2 131313 C C 1.3 13 1.3 1.3 13C CC 1.3 1.3 141414 C C 1.4 14 1.4 1.4 14C CC 1.4 1.4 151515 C C 1.5 15 1.5 1.5 15C CC 1.5 1.5 1.193 1.193 1.55 1.193 1.1931.55 1.55 1.55 1.193 1.55 1.293 1.293 1.65 1.293 1.2931.65 1.65 1.65 1.293 1.65 1.393 1.393 1.75 1.393 1.3931.75 1.75 1.75 1.393 1.75 1.493 1.493 1.85 1.493 1.4931.85 1.85 1.85 1.493 1.85 1.593 1.593 1.95 1.593 1.5931.95 1.95 1.95 1.593 1.95 111111 D D 1.1 11 1.1 1.1 11D DD 1.1 1.1 121212 D D 1.2 12 1.2 1.2 12D DD 1.2 1.2 131313 D D 1.3 13 1.3 1.3 13D DD 1.3 1.3 141414 D D 1.4 14 1.4 1.4 14D DD 1.4 1.4 151515 D D 1.5 15 1.5 1.5 15D DD 1.5 1.5 1.193 1.193 1.60 1.193 1.1931.60 1.60 1.60 1.193 1.60 1.293 1.293 1.70 1.293 1.2931.70 1.70 1.70 1.293 1.70 1.393 1.393 1.80 1.393 1.3931.80 1.80 1.80 1.393 1.80 1.493 1.493 1.90 1.493 1.4931.90 1.90 1.90 1.493 1.90 1.593 1.593 2.00 1.593 1.5932.00 2.00 2.00 1.593 2.00 161616 B B 1.6 16 1.6 1.6 16B BB 1.6 1.6 171717 B B 1.7 17 1.7 1.7 17B BB 1.7 1.7 181818 B B 1.8 18 1.8 1.8 18B BB 1.8 1.8 191919 B B 1.9 19 1.9 1.9 19B BB 1.9 1.9 202020 B B 2.0 20 2.0 2.0 20B BB 2.0 2.0 1.693 1.693 2.00 1.693 1.6932.00 2.00 2.00 1.693 2.00 1.793 1.793 2.10 1.793 1.7932.10 2.10 2.10 1.793 2.10 1.893 1.893 2.20 1.893 1.8932.20 2.20 2.20 1.893 2.20 1.993 1.993 2.30 1.993 1.9932.30 2.30 2.30 1.993 2.30 2.093 2.093 2.40 2.093 2.0932.40 2.40 2.40 2.093 2.40 161616 C C 1.6 16 1.6 1.6 16C CC 1.6 1.6 171717 C C 1.7 17 1.7 1.7 17C CC 1.7 1.7 181818 C C 1.8 18 1.8 1.8 18C CC 1.8 1.8 191919 C C 1.9 19 1.9 1.9 19C CC 1.9 1.9 202020 C C 2.0 20 2.0 2.0 20C CC 2.0 2.0 1.693 1.693 2.05 1.693 1.6932.05 2.05 2.05 1.693 2.05 1.793 1.793 2.15 1.793 1.7932.15 2.15 2.15 1.793 2.15 1.893 1.893 2.25 1.893 1.8932.25 2.25 2.25 1.893 2.25 1.993 1.993 2.35 1.993 1.9932.35 2.35 2.35 1.993 2.35 2.093 2.093 2.45 2.093 2.0932.45 2.45 2.45 2.093 2.45 161616 D D 1.6 16 1.6 1.6 16D DD 1.6 1.6 171717 D D 1.7 17 1.7 1.7 17D DD 1.7 1.7 181818 D D 1.8 18 1.8 1.8 18D DD 1.8 1.8 191919 D D 1.9 19 1.9 1.9 19D DD 1.9 1.9 202020 D D 2.0 20 2.0 2.0 20D DD 2.0 2.0 1.693 1.693 2.10 1.693 1.6932.10 2.10 2.10 1.693 2.10 1.793 1.793 2.20 1.793 1.7932.20 2.20 2.20 1.793 2.20 1.893 1.893 2.30 1.893 1.8932.30 2.30 2.30 1.893 2.30 1.993 1.993 2.40 1.993 1.9932.40 2.40 2.40 1.993 2.40 2.093 2.093 2.50 2.093 2.0932.50 2.50 2.50 2.093 2.50 212121 B B 2.1 21 2.1 2.1 21B BB 2.1 2.1 222222 B B 2.2 22 2.2 2.2 22B BB 2.2 2.2 232323 B B 2.3 23 2.3 2.3 23B BB 2.3 2.3 242424 B B 2.4 24 2.4 2.4 24B BB 2.4 2.4 252525 B B 2.5 25 2.5 2.5 25B BB 2.5 2.5 2.193 2.193 2.50 2.193 2.1932.50 2.50 2.50 2.193 2.50 2.293 2.293 2.60 2.293 2.2932.60 2.60 2.60 2.293 2.60 2.393 2.393 2.70 2.393 2.3932.70 2.70 2.70 2.393 2.70 2.493 2.493 2.80 2.493 2.4932.80 2.80 2.80 2.493 2.80 2.593 2.593 2.90 2.593 2.5932.90 2.90 2.90 2.593 2.90 212121 C C 2.1 21 2.1 2.1 21C CC 2.1 2.1 222222 C C 2.2 22 2.2 2.2 22C CC 2.2 2.2 232323 C C 2.3 23 2.3 2.3 23C CC 2.3 2.3 242424 C C 2.4 24 2.4 2.4 24C CC 2.4 2.4 252525 C C 2.5 25 2.5 2.5 25C CC 2.5 2.5 2.193 2.193 2.55 2.193 2.1932.55 2.55 2.55 2.193 2.55 2.293 2.293 2.65 2.293 2.2932.65 2.65 2.65 2.293 2.65 2.393 2.393 2.75 2.393 2.3932.75 2.75 2.75 2.393 2.75 2.493 2.493 2.85 2.493 2.4932.85 2.85 2.85 2.493 2.85 2.593 2.593 2.95 2.593 2.5932.95 2.95 2.95 2.593 2.95 212121 D D 2.1 21 2.1 2.1 21D DD 2.1 2.1 222222 D D 2.2 22 2.2 2.2 22D DD 2.2 2.2 2323 B B 2.3 2323 B 23 2.3 2.3 23D BB 2.3 2.3 2424 B B 2.4 2424 B 24 2.4 2.4 24D BB 2.4 2.4 2525 B B 2.5 2525 B 25 2.5 2.5 25D BB 2.5 2.5 2.193 2.193 2.60 2.193 2.1932.60 2.60 2.60 2.193 2.60 2.293 2.293 2.70 2.293 2.2932.70 2.70 2.70 2.293 2.70 2.393 2.393 2.80 2.393 2.3932.80 2.80 2.80 2.393 2.80 2.493 2.493 2.90 2.493 2.4932.90 2.90 2.90 2.493 2.90 2.593 2.593 3.00 2.593 2.5933.00 3.00 3.00 2.593 3.00 262626 B C D B 2.6 2.693 3.00 C 2.6 2.693 3.05 D 2.6 2.693 3.10 26 2.6 2.6 2.693 2.693 2.6933.00 3.00 3.00 262626 26 2.6 2.6 2.693 2.693 2.6933.05 3.05 3.05 262626 26 2.6 2.6 2.693 2.693 2.6933.10 3.10 3.10 26B BB 2.6 2.6 2.693 3.00 26C CC 2.6 2.6 2.693 3.05 26D DD 2.6 2.6 2.693 3.10 272727 B C D B 2.7 2.793 3.10 C 2.7 2.793 3.15 D 2.7 2.793 3.20 27 2.7 2.7 2.793 2.793 2.7933.10 3.10 3.10 272727 27 2.7 2.7 2.793 2.793 2.7933.15 3.15 3.15 272727 27 2.7 2.7 2.793 2.793 2.7933.20 3.20 3.20 27B BB 2.7 2.7 2.793 3.10 27C CC 2.7 2.7 2.793 3.15 27D DD 2.7 2.7 2.793 3.20 282828 B C D B 2.8 2.893 3.20 C 2.8 2.893 3.25 D 2.8 2.893 3.30 28 2.8 2.8 2.893 2.893 2.8933.20 3.20 3.20 282828 28 2.8 2.8 2.893 2.893 2.8933.25 3.25 3.25 282828 28 2.8 2.8 2.893 2.893 2.8933.30 3.30 3.30 28B BB 2.8 2.8 2.893 3.20 28C CC 2.8 2.8 2.893 3.25 28D DD 2.8 2.8 2.893 3.30 a See a See a aSee a5.3 5.3 See 5.3 See 5.3 5.3 4 44 © The British Standards Institution 2012 BSI 06-1999 BSI 06-1999 BSI BSI BSI 06-1999 06-1999 06-1999 Licensed Copy: Miss Anne Carty, British Standards Institution, 19/01/2012 15:56, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 170:1999 BS 4A 170:1999+A1:2012 Table Ð Bearing length L, clamping length M and overall length E (continued) No 6-32 UNC aL +0 20.03 29 B 30 B 31 B 32 B 33 B in 2.9 3.0 3.1 3.2 3.3 in 2.993 3.093 3.193 3.293 3.393 in 3.30 3.40 3.50 3.60 3.70 34 B 35 B 36 B 37 B 38 B 3.4 3.5 3.6 3.7 3.8 3.493 3.593 3.693 3.793 3.893 39 B 40 B 41 B 42 B 43 B 3.9 4.0 4.1 4.2 4.3 44 B 45 B 4.4 4.5 a M No 8-32 UNC E +0.04 20 Part no aL +0 20.03 29 C 30 C 31 C 32 C 33 C in 2.9 3.0 3.1 3.2 3.3 in 2.993 3.093 3.193 3.293 3.393 in 3.35 3.45 3.55 3.65 3.75 3.80 3.90 4.00 4.10 4.20 34 C 35 C 36 C 37 C 38 C 3.4 3.5 3.6 3.7 3.8 3.493 3.593 3.693 3.793 3.893 3.993 4.093 4.193 4.293 4.393 4.30 4.40 4.50 4.60 4.70 39 C 40 C 41 C 42 C 43 C 3.9 4.0 4.1 4.2 4.3 4.493 4.593 4.80 4.90 44 C 45 C 4.4 4.5 M No 10-32 UNF E +0.04 20 Part no aL M +0 20.03 E +0.04 20 29 D 30 D 31 D 32 D 33 D in 2.9 3.0 3.1 3.2 3.3 in 2.993 3.093 3.193 3.293 3.393 in 3.40 3.50 3.60 3.70 3.80 3.85 3.95 4.05 4.15 4.25 34 D 35 D 36 D 37 D 38 D 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 3.993 4.093 4.193 4.293 4.393 4.35 4.45 4.55 4.65 4.75 39 D 40 D 41 D 42 D 43 D 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 4.493 4.593 4.85 4.95 44 D 45 D 4.4 4.5 4.493 4.593 4.90 5.00 Part no See 5.3 © The British Standards Institution 2012 BSI 06-1999 5 Licensed Copy: Miss Anne Carty, British Standards Institution, 19/01/2012 15:56, Uncontrolled Copy, (c) The British Standards Institution 2012 BS BS 4A 4A 170:1999 170:1999+A1:2012 Table Ð Bearing length L, clamping length M and overall length E (continued) 1/ in UNF aL Part no 5/ in UNF 16 M E +0 20.03 + 0.04 20 ¯E 1E 2E 3E 4E 5E in 0.05 0.1 0.2 0.3 0.4 0.5 in 0.151 0.201 0.301 0.401 0.501 0.601 in 0.65 0.70 0.80 0.90 1.00 1.10 6E 7E 8E 9E 10 E 0.6 0.7 0.8 0.9 1.0 0.701 0.801 0.901 1.001 1.101 11 E 12 E 13 E 14 E 15 E 1.1 1.2 1.3 1.4 1.5 16 E 17 E 18 E 19 E 20 E aL Part no M E +0 20.03 + 0.04 20 ¯G 1G 2G 3G 4G 5G in 0.05 0.1 0.2 0.3 0.4 0.5 in 0.163 0.213 0.313 0.413 0.513 0.613 in 0.70 0.75 0.85 0.95 1.05 1.15 1.20 1.30 1.40 1.50 1.60 6G 7G 8G 9G 10 G 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 1.201 1.301 1.401 1.501 1.601 1.70 1.80 1.90 2.00 2.10 11 G 12 G 13 G 14 G 15 G 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 1.6 1.7 1.8 1.9 2.0 1.701 1.801 1.901 2.001 2.101 2.20 2.30 2.40 2.50 2.60 16 G 17 G 18 G 19 G 20 G 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 21 E 22 E 23 E 24 E 25 E 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 21 G 22 G 23 G 24 G 25 G 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 26 E 27 E 28 E 29 E 30 E 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 26 G 27 G 28 G 29 G 30 G 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 a 6 See 5.3 © The British Standards Institution 2012 BSI 06-1999 Licensed Copy: Miss Anne Carty, British Standards Institution, 19/01/2012 15:56, Uncontrolled Copy, (c) The British Standards Institution 2012 BS 4A 170:1999+A1:2012 BS 4A 170:1999 Table Ð Bearing length L, clamping length M and overall length E (continued) 1/ in UNF aL Part no 5/ in UNF 16 M E +0 20.03 + 0.04 20 31 E 32 E 33 E 34 E 35 E in 3.1 3.2 3.3 3.4 3.5 in 3.201 3.301 3.401 3.501 3.601 in 3.70 3.80 3.90 4.00 4.10 36 E 37 E 38 E 39 E 40 E 3.6 3.7 3.8 3.9 4.0 3.701 3.801 3.901 4.001 4.101 41 E 42 E 43 E 44 E 45 E 4.1 4.2 4.3 4.4 4.5 46 E 47 E 48 E 49 E 50 E 4.6 4.7 4.8 4.9 5.0 a aL Part no M E +0 20.03 + 0.04 20 31 G 32 G 33 G 34 G 35 G in 3.1 3.2 3.3 3.4 3.5 in 3.213 3.313 3.413 3.513 3.613 in 3.75 3.85 3.95 4.05 4.15 4.20 4.30 4.40 4.50 4.60 36 G 37 G 38 G 39 G 40 G 3.6 3.7 3.8 3.9 4.0 3.713 3.701 4.25 4.35 4.45 4.55 4.65 4.201 4.301 4.401 4.501 4.601 4.70 4.80 4.90 5.00 5.10 41 G 42 G 43 G 44 G 45 G 4.1 4.2 4.3 4.4 4.5 4.213 4.313 4.312 4.413 4.513 4.613 4.75 4.85 4.95 5.05 5.15 4.701 4.801 4.901 5.001 5.101 5.20 5.30 5.40 5.50 5.60 46 G 47 G 48 G 49 G 50 G 4.6 4.7 4.8 4.9 5.0 3.213 3.313 3.413 3.513 3.613 5.25 5.35 5.45 5.55 5.65 3.801 3.813 3.901 3.913 4.001 4.013 4.101 4.113 See 5.3 © The British Standards Institution 2012 BSI 06-1999 7 Licensed Copy: Miss Anne Carty, British Standards Institution, 19/01/2012 15:56, Uncontrolled Copy, (c) The British Standards Institution 2012 BS BS 4A 4A 170:1999 170:1999 +A1:2012 BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BSI Ð 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 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