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Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 17:36, Uncontrolled Copy, (c) The British Standards Institution 2012 "! !" ! ! ! !nD:XMX:) Xd` Md{ 6SHFLÀFDWLRQIRU :d{{d}Xd`W{D}X} X`P } DD[> FRUURVLRQUHVLVWLQJVWHHO ^}V{dd^WVD)ADA> PXVKURRPKHDGHG }[d DAWA{XD> 2d[ } p} {D`P V VORWWHGGULYHEROWV ) :[)}} IIeIq VWUHQJWKFODVV03D ICS ! 49.030.20 Oass ' %" #" ! !! & " ! "" ' ' " % 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 ! BSO 4AeeO=eaaa 114:1999 `:d{nd{) X`P +A2:2015 +A1:2012 d{{XPD`A^ No Incorporating corrigenda Nos and ! BS O 4A eeO=eaaa 114:1999+A2:2015 114:1999+A1:2012 he British Standards Institution 2012 d^^X DD} {D}nd`}X2[D Md{ VX} {X X}V ! )`A){A "VD n{Dn){) Xd` dM VX} {X X}V ! )`A){A )} D` {} DA d "D:V`X:)[ d^^X DD e> D{d}n):D M)} D`D{} )`A M)} D`X`P }} D^}> nd` VX:V VD Md[[dX`P 2dAXD} D{D {Dn{D}D` DA= XX[ X) Xd` Vd{X pX{d{ VX`D}} XX}Xd`q d`MDAD{) Xd` dM {X X}V d{PD{} X`X} { dM DMD`:D !d:XD dM {X X}V D{d}n):D d^n)`XD} X^X DA dWdn DA ^D^2D{ This British Standard, having been approved by the Engineering Sector Committee, was published under authority of the Standards Committee and comes into effect on 15 July 1999 © The British Standards Institution 2016 Published by BSI Standards Limited 2016 The following BSI references relate to the work on this standard: Committee reference ACE/12 Drafts for comment 98/706175 DC, 12/30262058 DC, 15/30317035 DC ISBN 978 580 92822 Amendments/corrigenda issued since publication Amd No Date Comments C1 March 2010 A1 September 2012 See Foreword A2 September 2015 See Foreword C2 February 2016 Clause and 4.2 b) updated Table – max and columns reordered Table – upper tolerance of E updated ! O eeO = eaaa BS 4A 114:1999+A2:2015 114:1999+A1:2012 Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 17:36, Uncontrolled Copy, (c) The British Standards Institution 2012 d` D` } )PD d^^X DD} {D}nd`}X2[D `}XAD M{d` :dD{ d{Dd{A XX e !:dnD e d{^) XD {DMD{D`:D} e D`D{)[ {DvX{D^D` } e O ) D{X)[} )`A ^)`M): {D e N X^D`}Xd`} )`A d[D{)`:D} e !:{DW V{D)A} e finish Protective ` XW:d{{d}Xd` {D) ^D` e I ){A`D}} )[D} e a AD` XMX`P )`A ^){ZX`P e e )[X )}}{)`:D n{d:DA{D e XP{D e X^D`}Xd`} dM 2d[ } XP{D D){X`P [D`P V > :[)^nX`P [D`P V )`A dD{)[[ [D`P V ")2[D e X^D`}Xd`} dM 2d[ } ")2[D D){X`P [D`P V > :[)^nX`P [D`P V )`A dD{)[[ [D`P V O for manufacture of bolts ")2[D Materials ^) D{X)[} Md{ ^)`M): {D dM 2d[ } © The British Standards Institution 2016 2012 2015 N ! 2010 i X BS 4A 114:1999+A2:2015 Foreword Publishing information This British Standard is published by BSI Standards Limited, under licence from The British Standards Institution, and came into effect on 15 July 1999 It was prepared by Technical Committee ACE/12, Aerospace fasteners and fastening systems A list of organizations represented on this committee can be obtained on request to its secretary Supersession BS 4A 114:1999+A2:2015 supersedes BS 4A 114:1999+A1:2012, which is withdrawn Information about this document Text introduced or altered by Amendments No (and No 2, respectively) are indicated in the text by tags (and ) Minor editorial changes are not tagged Contractual and legal considerations This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application Licensed Compliance with a British Standard cannot confer immunity from legal obligations !^^){ dM n)PD} "VX} Ad:^D` :d^n{X}D} ) M{d` :dD{> )` X`}XAD M{d` :dD{> n)PD} X )`A XX> n)PD} e d )`A ) 2):Z :dD{s ii © The British Standards Institution 2016 2015 e British Sta ion BS 4A 114:1999+A2:2015 e !:dnD This British Standard specifies materials and manufacture, dimensions, protective treatment and quality assurance requirements for corrosion-resisting and heat resisting steel, mushroom-headed, slotted-drive, bolts (minimum tensile strength 880 MPa). " "VD [) D} DAX Xd` dM )` D{d}n):D !D{XD} } )`A){A X} X`AX:) DA 2 ) n{DMX `^2D{s d{^) XD {DMD{D`:D} The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies BS 4A 100:2003, Specification for general requirements for bolts and free running nuts of tensile strength not exceeding 1249 MPa BS S 80, Specification for high chromium-nickel corrosion-resisting steel forging stock, bars, forgings and parts (880-1080 MPa, limiting ruling section 100 mm) BS S 143, Specification for chromium-nickelcopper-molybdenum corrosion-resisting steel (precipitation hardening) billets, bars, forgings and parts (930-1080 MPa) Text deleted. BS EN 2398, Aerospace series – Heat resisting steel FE-PA2601 (X6NiCrTiMoV26-15) – Rm = 900 MPa – Bars for machined bolts – D = 25 mm BS EN 2399, Aerospace series – Heat resisting VWHHO)(3$ ;1L&U7L0R9 ²5P 03D²%DUVIRUIRUJHGEROWV²'PP BS EN ISO 6506-1, Metallic materials – Brinell hardness test – Part 1: Test method BS EN ISO 6507-1, Metallic materials – Vickers hardness test – Part 1: Test method. ed Copy: Miss Lucie Carter, Britis BS HR 650, Specification for High expansion heat-resisting steel bar and wire for the manufacture of bolts, studs, set screws and nuts – (Ni 25.5, Cr 15, Ti 2, Mn 1.5, Mo 1.25, Si 0.7, V 0.3) (Limiting ruling section 20 mm). D`D{)[ {DvX{D^D` } Os "VD ^) D{X)[ }DA Md{ VD ^)`M): {D dM Md{PDA 2d[ } }V)[[ V)D VD Md[[dX`P ^D:V)`X:)[ n{dnD{ XD} X` VD MX`)[[ VD) {D) DA :d`AX Xd`= a) 0.2 % proof stress (min.) : 590 MPa; b) tensile strength (min.) : 880 MPa Text deleted; c) elongation (min.) : 12 %; d) Izod impact (min.) : 55J (40 ft lbf ) NOTE This is not applicable to the materials given in BS EN 2398 and BS EN 2399. N X^D`}Xd`} )`A d[D{)`:D} Nse [[ MX`X}VDA 2d[ }> }V)[[ :d`Md{^ d VD AX^D`}Xd`} )`A d[D{)`:D} PXD` X` ")2[D} e )`A s Ns "VD :[)^nX`P [D`P V dM VD 2d[ }V)[[ :d`Md{^ d VD AX^D`}Xd`} )`A d[D{)`:D} PXD` X` ")2[D > )`A }V)[[ 2D }:V V) > VD` ) } )`A){A ` X Vd countersink V)} :d` D{}X`Z d{ {X`P P)PD X Vd :d` D{}`Z 2DD` }:{DDA d` )} M){ )} nd}}X2[D 2 V)`A> X } [D)AX`P M):D X} X VX` AX} )`:D M{d^ VD `AD{}XAD dM VD 2d[ VD)As "VD {` d dM VD V{D)A }V)[[ `d D:DDA X:D VD nX :Vs Ns "VD `d^X`)[ [D`P V dM VD 2d[ }V)[[ 2D VD ^X`X^^ 2D){X`P [D`P V ^X`> VX:V }V)[[ 2D VD ^X`X^^ :[)^nX`P [D`P V> ^X`> [D}} d V{D)A nX :VD}s " "VD L vd DA X`in")2[D ){D X`in se X`:V NOTE The2D){X`P bearing[D`P V lengths quoted Table are 0.10 inch X`:{D^D` } 2 VD{D ) sN [D`P V X`:{D^D` X} {DvX{DA VX} X} nD{^X}}X2[D 2 )P{DD^D` 2D DD` ^)`M): {D{ )`A }D{ )`A }Vd[A 2D XAD` XMXDA )} Md[[d} = I X`AX:) X`P ) W # 2d[ L, M )`A and E `DDA need d to be dM 2D){X`P [D`P V sIN X`:VD} > 2D adjusted )AY} DA )::d{AX`P[s !:{D V{D)A} "VD 2d[ } }V)[[ V)D #`XMXDA }:{D V{D)A} dM VD Md{^ )`A MX }nD:XMXDA X` VD [) D} DAX Xd` dM {X X}V ! )`A){A es 3URWHFWLYHILQLVK There shall be no protective finish applied. +DUGQHVVYDOXHV 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: d[ } }V)[[ :d`Md{^ d ! e a) for machined components: 255 min./321 max HB or 270 min./340 max HV; O ) D{X)[} )`A ^)`M): {D b) for forged components: 248 min./341 max HB or 260 min./360 max HV. Ose "VD 2d[ } }V)[[ 2D ^)`M): {DA 2 d`D dM VD Md[[dX`P ^D VdA}= )q ^):VX`DA M{d^ 2{XPV A{)` 2){} VX:V :d`Md{^ d d`D dM VD {X X}V ! )`A){A} [X} DA X` ")2[D 2q :d[A Md{PDA ^) D{X)[ VX:V :d`Md{^} d d`D dM VD {X X}V ! )`A){A} [X} DA X` ")2[D s © The British Standards Institution 2016 2015 BS 4A 114:1999+A2:2015 114:1999+A1:2012 ,GHQWLI\LQJDQGPDUNLQJ 0DUNLQJ ,GHQWLILFDWLRQ tish Standards Institution, 07/08/2012 17:36, Uncontrolled Copy, (c) The British Standards Institution 20 Bolts made from material conforming to BS EN 2398 or BS EN 2399 shall be identified with a code “X ”, e.g a 6-32 UNC bolt with an “L” dimension of 0.1 inches and made from one of the two materials above shall be referenced as “A114X1B” or for bolts made from material conforming to BS S 80 or BS S 143, this shall be identified as “A114-1B” Bolts shall be marked in accordance with BS 4A 100:2003, Clause Bolts for all nominal sizes made from material conforming to BS EN 2398 or BS EN 2399 shall be marked with an “X ”. e )[X )}}{)`:D n{d:DA{D "VD 2d[ } }V)[[ :d`Md{^ d VD v)[X {DvX{D^D` } }nD:XMXDA X` ! e> )} )nn{dn{X) D d VD ^D VdA dM ^)`M):{Ds >íấếếèấv èi>` rấểấíấôèV I ưvấiv ịđ ưLi>} i}èđ , >` {x O I ưV>ô} i}èđ À>` I ÛiÀ> i}Ì ® XP{D e X^D`}Xd`} dM 2d[ } eq d{ 2D){X`P [D`P V > :[)^nX`P [D`P V )`A dD{)[[ [D`P V }DD ")2[D s XP{D D){X`P [D`P V > :[)^nX`P [D`P V )`A dD{)[[ [D`P V © The British Standards Institution 2016 2012 2015 0.1895 seIN 0.1635 seN © The British Standards Institution 2016 X` sI se s s s sOa sONa s s s X` DMs d`[ X`s [D`P V nX :V dM }:{DDA 7KUHDG nd{ Xd` dM UXQRXW }V)`Z (2 × SLWFK eq 0.666 sa 0.546 sNN 0.425 sOOe 0.364 sI 0.303 se in X` ^)s 0.690 s 0.565 sNO 0.441 sON 0.378 sO 0.316 s in X` ^X`s max 0.162 seI 0.133 seN 0.103 seeI 0.088 se 0.074 sI in X` ^)s in X` ^X`s max 0.183 se 0.150 se 0.118 se 0.102 sII 0.086 sO q "VX:Z`D}} dM VD)A s sN s seN se X` )nn{ds [X`A{X:)[ nd{ Xd` dM VD)A ")2[D e X^D`}Xd` dM 2d[ } X)^D D{ dM VD)A sOO sIa sO sNN sN X` DM d`[ # )AX} dM VD)A 0.015 s 0.015 s 0.010 s 0.010 s 0.005 seN in X` ^)s 0.030 seN 0.030 seN 0.020 se 0.020 se 0.015 sN in X` ^X`s max )AX} `AD{ 2d[ VD)A in X` ^)s 0.030 sO 0.030 sO 0.020 s 0.020 s 0.040 s 0.040 s 0.030 s 0.030 s 0.030 s in X` ^X`s max Dn V dM :V)^MD{ 0.020 s eq "VX} AX^D`}Xd` X} )` )2}d[ D ^X`X^^ )}}d:X) DA X V ^)X^^ [D`P V )`A ^X`X^^ [D`P V s X} `d X` D`ADA Md{ }D Md{ ^)`M): {X`P d{ X`}nD: Xd` n{nd}D}s q DMd{D XAD` XMX:) Xd` {D:D}} q "d 2D ^D)}{DA M{d^ VD dn dM VD VD)A d VD ndX` ) VX:V VD }[d 2{D)Z} V{dPVs 0.3120 sa 1/4-28 UNF sN 0.250-28 UNF# (E) X` 0.1865 seIaN 0.1605 seN 0.3125-24 UNF (G) seN 5/16-24 UNF 0.3090 Ne X` # se 10-32 UNF sea 0.190-32 (10) ds eWUNF# 0.2495 sON 8-32 UNC seO 0.164-32 (8) ds IW UNC # in X` 0.1375 seON in X` ^X`s max 0.1345 seN ^)s X)^D D{ dM n[)X` nd{ Xd` dM }V)`Z 0.2465 sOaN X` 6-32 UNC seI D:X^)[ dM DvX)[D` $OWHUQDWLYH `d^X`)[ WKUHDG }XD UHIHUHQFH 0.138-32 (6) ds W UNC # d^X`)[ }XD 1RPLQDO WKUHDGVL]H s sO sN sON sa X` ^X`s sIO sN s sNO sOI X` ^)s %XA V X` sa s sNN sO sI X` ^)s se sI sN sN sOI q Dn V ^X`s ![d BS 4A 114:1999+A2:2015 Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 17:36, Uncontrolled Copy, (c) The British Standards Institution 2012 ! BS O 4A eeO=eaaa 114:1999+A2:2015 114:1999+A1:2012 ")2[D D){X`P [D`P V > :[)^nX`P [D`P V )`A dD{)[[ [D`P V ){ d e X` ds W # t 0.030 s 1/2B e 1B e 2B 3B 4B O 5B N 6B 7B 8B I 9B a 10B e 11B ee 12B e 13B e 14B eO 15B eN 16B e 17B e 18B eI X` sN se s s sO sN s s sI sa es ese es es esO esN es es esI X` seO sea sa sa sOa sNa sa sa sIa saa esa esea esa esa esOa esNa esa esa esIa ea 19B 20B e 21B esa s se 22B 23B O 24B N 25B 26B 27B I 28B s s sO sN s s sI ds IW # t 0.030 s ds eW # e X` t 0.030 s t 0.040 sO 1/2D e 1D e 2D 3D 4D O 5D N 6D 7D 8D I 9D a 10D e 11D ee 12D e 13D e 14D O 15D eN 16D e 17D e 18D I X` sN se s s sO sN s s sI sa es ese es es esO esN es es esI X` seO sea sa sa sOa sNa sa sa sIa saa esa esea esa esa esOa esNa esa esa esIa X` sNN s s sI sa es ese es es esO esN es es esI esa s se s s sN sON sNN 19D ea 20D 21D e esa s se esaa sa sea sO sN s sN sN sIN saN sN seN sN 22D 23D O 24D N 25D 26D 27D I 28D s s sO sN s s sI sa sa sOa sNa sa sa sIa s sI sa s se s s ){ d e X` X` sON sN s s sI sa es ese es es esO esN es es esI esa s se s 1/2C e 1C e 2C 3C 4C O 5C N 6C 7C 8C I 9C a 10C e 11C ee 12C e 13C e 14C eO 15C eN 16C e 17C e 18C eI X` sN se s s sO sN s s sI sa es ese es es esO esN es es esI X` seO sea sa sa sOa sNa sa sa sIa saa esa esea esa esa esOa esNa esa esa esIa X` sN sNN sN sN sIN saN esN eseN esN esN esON esNN esN esN PesINQ esaN sN seN PsNQ esaa sa sea s sO sN 19C ea 20C 21C e esa s se esaa sa sea sa sa sOa sNa sa sa sIa s s sI sa s se s 22C 23C O 24C N 25C 26C 27C I 28C s s sO sN s s sI sa sa sOa sNa sa sa sIa t 0.040 sO t 0.040 sO ){ d " d[ } X V Vd}D AX^D`}Xd`} [X} DA 2D[d VD Ad2[D [X`D ^) `d 2D {D)AX[ ))X[)2[D X` [){PD v)` X XD} 2D:)}D dM [X^X ) Xd`} X` ^)`M): {D 2 Md{PX`Ps e !DD Nss O © The British Standards Institution 2016 2012 2015 N ! 2010 Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 17:36, Uncontrolled Copy, (c) The British Standards Institution 2012 ! O eeO=eaaa BS 4A 114:1999+A2:2015 114:1999+A1:2012 ")2[D D){X`P [D`P V > :[)^nX`P [D`P V )`A dD{)[[ [D`P V p:d` X`DAq ){ d e X` ds W # t 0.030 s 29B a 30B 31B e 32B 33B 34B O 35B N 36B 37B 38B I 39B a 40B O 41B Oe 42B O 43B O 44B OO 45B ON X` sa s se s s sO sN s s sI sa Os Ose Os Os OsO OsN X` saa sa sea sa sa sOa sNa sa sa sIa saa Osa Osea Osa Osa OsOa OsNa eq t 0.040 sO X` s sO sN s s sI sa Os Ose Os Os OsO OsN Os Os OsI Osa ){ d e X` 29C a 30C 31C e 32C 33C 34C O 35C N 36C 37C 38C I 39C a 40C O 41C Oe 42C O 43C O 44C OO 45C ON X` sa s se s s sO sN s s sI sa Os Ose Os Os OsO OsN ds IW # t 0.030 s X` saa sa sea sa sa sOa sNa sa sa sIa saa Osa Osea Osa Osa OsOa OsNa t sO 0.040 X` sN sON sNN sN sN sIN saN OsN OseN OsN OsN OsON POsNNQ OsN POsNQ OsIN OsaN ){ d 29D a 30D 31D e 32D 33D 34D O 35D N 36D 37D 38D I 39D a 40D O 41D Oe 42D O 43D O 44D OO 45D ON ds eW # e X` t 0.030 s t sO 0.040 X` sa s se s s sO sN s s sI sa Os Ose Os Os OsO OsN X` sO sN s s sI sa Os Ose Os Os OsO OsN Os Os OsI Osa Ns X` saa sa sea sa sa sOa sNa sa sa sIa saa Osa Osea Osa Osa OsOa OsNa !DD Nss © The British Standards Institution 2016 2012 2015 N ! 2010 N Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 17:36, Uncontrolled Copy, (c) The British Standards Institution 2012 ! BS O 4A eeO=eaaa 114:1999+A2:2015 114:1999+A1:2012 ")2[D D){X`P [D`P V > :[)^nX`P [D`P V )`A dD{)[[ [D`P V p:d` X`DAq ){ d e X` X` # eO `M t 0.030 s 1/2E e 1E e 2E 3E 4E O 5E N 6E 7E 8E I 9E a 10E e 11E ee 12E e 13E e 14E eO 15E eN 16E e 17E e 18E eI 19E ea 20E 21E e 22E 23E 24E O X` sN se s s sO sN s s sI sa es ese es es esO esN es es esI esa s se s s sO X` seNe se se sOe sNe se se sIe sae ese esee ese ese esOe esNe ese ese esIe esae se see se se sOe sNe 25E N 26E 27E sN s s 28E I 29E a 30E 31E e 32E 33E 34E O 35E N sI sa s se s s sO sN ){ d e X` Ne X` # t 0.030 s X` sN s sI sa es ese es es esO esN es es esI esa s se s s sO sN s s sI sa s 1/2G e 1G e 2G 3G 4G O 5G N 6G 7G 8G I 9G a 10G e 11G ee 12G e 13G e 14G eO 15G eN 16G e 17G e 18G eI 19G ea 20G 21G e 22G 23G 24G O X` sN se s s sO sN s s sI sa es ese es es esO esN es es esI esa s se s s sO X` se se se sOe sNe se se sIe sae ese esee ese ese esOe esNe ese ese esIe esae se see se se sOe sNe X` s sN sIN saN esN eseN esN esN esON esNN esN esN esIN esaN sN seN sN sN sON sNN sN sN sIN saN sN se se sIe se s s 25G N 26G 27G sN s s se se sIe seN sN sN sae se see se se sOe sNe se sO sN s s sI sa Os Ose 28G I 29G a 30G 31G e 32G 33G 34G O 35G N sI sa s se s s sO sN sae se see se se sOe sNe se sON sNN sN sN sIN P3.95Q OsN OseN t sO 0.040 t 0.040 sO d D d[ } X V Vd}D AX^D`}Xd`} [X} DA 2D[d VD Ad2[D [X`D ^) `d 2D {D)AX[ ))X[)2[D X` [){PD v)` X XD} 2D:)}D dM [X^X ) Xd`} X` ^)`M): {D 2 Md{PX`Ps eq !DD Nss © The British Standards Institution 2016 2012 2015 N ! 2010 2012:36, Uncontrolled Copy, (c) The British Standards Institution 20 BS 4A 114:1999+A2:2015 ")2[D D){X`P [D`P V > :[)^nX`P [D`P V )`A dD{)[[ [D`P V p:d` X`DAq ){ d e X` 36E 37E 38E I 39E a 40E O 41E Oe 42E O 43E O 44E OO 45E ON 46E O 47E O 48E OI 49E Oa 50E N X` s s sI sa Os Ose Os Os OsO OsN Os Os OsI Osa Ns eq!DD X` # eO `M t P P t 0.040 sO 0.030 s X` se sIe sae Ose Osee Ose Ose OsOe OsNe Ose Ose OsIs 4.801 Osae Nse Nsee X` Os Os OsO OsN Os Os OsI Osa Ns Nse Ns Ns NsO NsN Ns ){ d e X` 36G 37G 38G I 39G a 40G O 41G Oe 42G O 43G O 44G OO 45G ON 46G O 47G O 48G OI 49G Oa 50G N X` s s sI sa Os Ose Os Os OsO OsN Os Os OsI Osa Ns Ne X` # t 0.030 s X` P3.713Q P3.813Q P3.913Q P4.013Q P4.113Q Ose P4.313Q OsOe OsNe Ose se se sOe sNe se t 0.040 sO X` OsN OsN OsON OsNN OsN OsN OsIN OsaN NsN NseN NsN NsN NsON NsNN NsN Nss ")2[D ) D{X)[} Md{ ^)`M): {D dM 2d[ } %61R BS S 80 BS S 143 BS HR 650 BS S 143 BS EN 2398 BS EN 2399 0DWHULDO 1/2% nickel-chromium-molybdenum steel Chromium-nickel-molybdenum corrosionresisting steel Chromium-nickel-molybdenum corrosionHigh expansion heat-resisting steel bar resisting and wire steel High expansion heat-resisting steel High expansion heat-resisting steel $SSOLFDWLRQ For the manufacture of machined bolts For the manufacture of machined bolts For the manufacture of machined bolts bolts, studs, set screws and nuts For the manufacture of machined bolts For the manufacture of forged bolts © The British Standards Institution 2016 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