BRITISH STANDARD BS 4A 111 1993 (superseding BS 3A 111 1962) Specification for Cadmium plated steel bolts — (Unified hexagons and Unified threads) with close tolerance shanks Reproduced by IHS under l[.]
BRITISH STANDARD BS 4A 1 :1 993 (superseding BS 3A 11 :1 962) Specification for Cadmium-plated steel bolts — (Unified hexagons and Unified threads) with close tolerance shanks Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy BS 4A 111:1993 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Aerospace Systems Standards Policy Committee (ACE/- ) to Technical Committee ACE/1 2, upon which the following bodies were represented: The Association of Electronics, Telecommunications and Business Equipment Industries British Industrial Fasteners Federation Ministry of Defence Society of British Aerospace Companies Ltd This British Standard, having been prepared under the direction of the Aerospace Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on April 993 © BSI 2- 999 The following BSI references relate to the work on this standard: Committee reference ACE/1 Draft announced in BSI News February 993 ISBN 580 21647 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy Amendments issued since publication Amd No Date Comments BS 4A 111:1993 Contents Page C ommittees res p ons ib le Ins ide front cover Foreword ii S cop e References Procurement Materials and manufacture Anti- corros ion treatment D imens ions S crew threads Tab le — D imens ions Tab le — Bearing length overall length E Lis t of references © BS I - 99 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy L , clamp ing length M and Ins ide b ack cover i BS A 1 : 993 Fore word This edition of this British Standard has been prepared under the direction of the Aerospace Standards Policy Committee and supersedes BS 3A 1 : 962 which is withdrawn This edition clarifies the maximum diameter of bolts after plating, but it does not reflect a full review or revision of the standard which will be undertaken in due course The 0003 in plating allowance on the maximum diameter quoted in BS 3A 1 (and preceding editions) is now embodied in the maximum diameter after plating in Table , and separate reference to a plating allowance has been deleted The maximum diameter of bolts before plating has been deleted and the thickness of plating is now controlled An equivalent range of bolts with unplated shanks is specified in BS 3A 08 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 C omp liance with a British S tand ard d oe s no t of itse lf confe r immunity from le gal ob ligatio ns S ummary of p age s This document comprises a front cover, an inside front cover, pages i and ii, pages to 4, an inside back cover and a back cover This standard has been updated (see copyright date) and may have had amendments incorporated This will be indicated in the amendment table on the inside front cover ii Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy © BSI 2- 999 BS 4A 1 :1 993 4.2 In the finally heat-treated condition, the mechanical properties of the material used for This British Standard specifies the materials, forged bolts shall be as follows: dimensions, finish and inspection requirements for 0.1 % proof stress not less than steel bolts with Unified hexagons, Unified threads 664 MPa and close tolerance shanks cadmium plated to be (43 tonf/in2) suitable for insertion in aluminium alloy materials, for aircraft tensile strength not less than 850 MPa References (55 tonf/in2) not more than 2.1 Normative references 003 MPa This British Standard incorporates, by reference, (65 tonf/in2) provisions from specific editions of other publications These normative references are cited elongation on Ỉ area not less than 18 % at the appropriate points in the text and the Izod impact value: not less than 54 J publications are listed on the inside back cover (40 ft·lbf) Subsequent amendments to, or revisions of, any of these publications apply to this standard only when Anti-corrosion treatment incorporated in it by updating or revision All finished bolts shall be coated with cadmium in 2.2 Informative references This British Standard refers to other publications accordance with DEF STAN 03-19[1] that provide information or guidance Editions of Dimensions these publications current at the time of issue of this 6.1 All finished bolts, after the application of the standard are listed on the inside back cover, but cadmium coating, shall conform to the dimensions reference should be made to the latest editions and tolerances given in Table and Table Procurement 6.2 The clamping length of the bolt shall conform to the dimensions and tolerances given in Table 2, and The bolts shall conform to the latest edition of shall be such that when a standard nut without BS A 100 countersink or ring gauge without countersink has been screwed on as far as possible by hand, its Materials and manufacture leading face is within the distance M from the 4.1 The bolts shall be manufactured by one of the underside of the bolt head The runout of thread following methods: shall not exceed twice the pitch a) machined from bright drawn bars which 6.3 The nominal length of the bolt shall be the conform to the following British Standards: minimum bearing length L, which is determined by the minimum clamping length M less two thread BS 3S 95:1967 pitches or BS 2S 114:1964 or BS 2S 116:1964 bolts up to and Screw threads including 3/8 in diameter; The bolts shall have Unified threads of the form and or BS 2S 117:1964 class of fit specified in the latest edition of BS A 100 or BS S 154:1976 Scope NOTE BS S 96 material may be used until stocks are exhausted b) forged from material which conforms to the following British Standards: BS 3S 102:1969 or BS 3S 105:1969 or BS 2S 147:1976 or BS S 148:1969 or BS 2S 149:1976 or BS S 158:1977 © BSI 12-1999 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy 2 /1 © BSI - 999 , clamping length 4987 4362 3737 31 2 489 887 Min Before plating M 4993 4368 3743 31 493 891 Min E M 770 670 97 497 459 377 75 0 688 562 500 438 344 Max E 741 679 54 493 431 866 794 65 0 77 05 397 Max C Width across corners 10 12 300 70 2 0 80 50 1 Max Min 90 60 0 70 40 05 D Thickness of head 11 14 030 030 030 030 030 02 Max Min 01 01 01 01 01 01 R Radius under bolt head 13 16 050 050 040 040 040 030 Max Min 040 040 030 030 030 02 G Depth of chamfer 15 18 74 67 5 49 43 33 –0 01 K 03 03 03 03 03 03 H Diameter Depth Identification disk 17 D imensions in inches It is not intended for use for manufacturing or inspection purposes Min 339 B Width across flats and minimum length Reference only 2) F Minimum length of screwed portion of shank see Table 00 00 083 083 071 063 and overall length 001 4376 3751 31 01 899 Max After plating A Diameter of plain portion × pitch of shank This dimension is an absolute minimum associated with maximum length L /2 in UNF /1 in UNF /8 in UNF /1 in UNF For b earing length Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy 2) 1) /2 /8 /1 /4 in UNF 1 /4 No 0- 32 UNF 90 Thread Nominal size Diameter of plain portion of shank Table — Dimensions BS 4A 111:1993 BS 4A 1 : 993 Tab le — Be aring le ngth L , clamping le ngth M and ove rall le ngth E Dimensions in inches No -3 UNF Part No La M –0.03 E +0.04 Part No /4 in UNF La M –0.03 E +0.04 Part No /1 in UNF La M –0.03 E +0.04 /2 D 1D 2D 3D 4D 5D 0.05 0.1 0.2 0.3 0.4 0.5 0.143 0.193 0.293 0.393 0.493 0.593 0.55 0.60 0.70 0.80 0.90 1.00 1E 2E 3E 4E 5E 0.1 0.2 0.3 0.4 0.5 0.201 0.301 0.401 0.501 0.601 0.70 0.80 0.90 1.00 1.10 1G 2G 3G 4G 5G 0.1 0.2 0.3 0.4 0.5 0.213 0.313 0.413 0.513 0.613 0.75 0.85 0.95 1.05 1.15 6D 7D 8D 9D 10D 0.6 0.7 0.8 0.9 1.0 0.693 0.793 0.893 0.993 1.093 1.10 1.20 1.30 1.40 1.50 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 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 11D 12D 13D 14D 15D 1.1 1.2 1.3 1.4 1.5 1.193 1.293 1.393 1.493 1.593 1.60 1.70 1.80 1.90 2.00 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 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 16D 17D 18D 19D 20D 1.6 1.7 1.8 1.9 2.0 1.693 1.793 1.893 1.993 2.093 2.10 2.20 2.30 2.40 2.50 16E 17E 18E 19E 20E 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 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 21D 2.1 2.193 2.60 21E 2.1 2.201 2.70 21G 2.1 2.213 2.75 22D 23D 24D 2.2 2.3 2.4 2.293 2.393 2.493 2.70 2.80 2.90 22E 23E 24E 2.2 2.3 2.4 2.301 2.401 2.501 2.80 2.90 3.00 22G 23G 24G 2.2 2.3 2.4 2.313 2.413 2.513 2.85 2.95 3.05 25D 2.5 2.593 3.00 25E 26E 27E 2.5 2.6 2.7 2.601 2.701 2.801 3.10 3.20 3.30 25G 26G 27G 2.5 2.6 2.7 2.613 2.713 2.813 3.15 3.25 3.35 28E 29E 30E 2.8 2.9 3.0 2.901 3.001 3.101 3.40 3.50 3.60 28G 29G 30G 2.8 2.9 3.0 2.913 3.013 3.113 3.45 3.55 3.65 31G 32G 33G 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 36G 37G 3.6 3.7 3.713 3.813 4.25 4.35 NOTE Bolts below the heavy line may not be readily available in large quantities because of limitations in manufacture by forging a See © BSI 12-1999 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy BS A 1 :1 993 Tab le — Be aring length Part No L , clamp ing le ngth /8 in UNF Lb M –0.03 E +0.04 Part No M and ove rall length /1 in UNF Lb M –0.03 E +0.04 Part No E /2 in UNF Lb M –0.03 E +0.04 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 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 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 6L 7L 8L 9L 10L 0.6 0.7 0.8 0.9 1.0 0.730 0.830 0.930 1.030 1.130 1.45 1.55 1.65 1.75 1.85 6N 7N 8N 9N 10N 0.6 0.7 0.8 0.9 1.0 0.730 0.830 0.930 1.030 1.130 1.55 1.65 1.75 1.85 1.95 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 11L 12L 13L 14L 15L 1.1 1.2 1.3 1.4 1.5 1.230 1.330 1.430 1.530 1.630 1.95 2.05 2.15 2.25 2.35 11N 12N 13N 14N 15N 1.1 1.2 1.3 1.4 1.5 1.230 1.330 1.430 1.530 1.630 2.05 2.15 2.25 2.35 2.45 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 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 21J 22J 23J 24J 25J 26J 27J 28J 29J 30J 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 2.213 2.313 2.413 2.513 2.613 2.713 2.813 2.913 3.013 3.113 2.85 2.95 3.05 3.15 3.25 3.35 3.45 3.55 3.65 3.75 21L 22L 23L 24L 25L 26L 27L 28L 29L 30L 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 2.230 2.330 2.430 2.530 2.630 2.730 2.830 2.930 3.030 3.130 2.95 3.05 3.15 3.25 3.35 3.45 3.55 3.65 3.75 3.85 21N 22N 23N 24N 25N 26N 27N 28N 29N 30N 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 2.230 2.330 2.430 2.530 2.630 2.730 2.830 2.930 3.030 3.130 3.05 3.15 3.25 3.35 3.45 3.55 3.65 3.75 3.85 3.95 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 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 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 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 NOTE Bolts below the heavy line may not be readily available in large quantities because of limitations in manufacture by forging b See Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy © BSI 12-1999 BS 4A 111:1993 List of references (see clause 2) Normative references BSI standards publications BRITISH STANDARDS INSTITUTION, London Specification for general requirements for bolts and free running nuts of tensile strength not exceeding 249 MPa BS 3S 95: 967, Specification for 1 /2 per cent nickel-chromium-molybdenum steel [90/110 kgf/mm2 (57/70 tonf/in2): limiting ruling section 150 mm (6 in)] BS 3S 02: 969, Specification for carbon-molybdenum steel (bar for the manufacture of forged bolts only) BS 3S 05: 969, Specification for carbon steel (bar for the manufacture of forged bolts only) BS 2S 1 4: 964, Specification for aircraft material Manganese-molybdenum steel (55/65 tonf/sq in: limiting ruling section 21 /2 inches) BS 2S 1 6: 964, Specification for aircraft material “40” carbon steel bright bars for machining (55-65 tonf/sq in: limiting ruling section 3/4 inch) (primarily intended for the manufacture of machined bolts) BS 2S 1 7: 964, Specification for aircraft material per cent chromium steel (55/65 tonf/sq in: limiting ruling section 1 /8 inch) BS 2S 47: 976, Specification for 0.5 % nickel-chromium-molybdenum steel bars for the manufacture of forged bolts and forged nuts BS S 48: 969, Specification for low nickel-chromium steel (bar for the manufacture of forged bolts only) BS 2S 49: 976, Specification for 1.75 % nickel-chromium-molybdenum steel bars for the manufacture of forged bolts and forged nuts BS S 54: 976, Specification 21 % nickel-chromium-molybdenum steel billets, bars, forgings and parts (880–1 080 MPa: limiting ruling section 150 mm) BS S 58: 977, Specification for % chromium-molybdenum steel bars for the manufacture of forged bolts and forged nuts BS 3A 00: 991 , 1) Other references [1 ] DEF STAN 03- Electro-Deposition of Cadmium available from Ministry of Defence (Procurement Executive), Directorate of Standardization, Kentigern House, 65 Brown St, Glasgow G2 8EX Informative references BSI standards publications BRITISH STANDARDS INSTITUTION, London Specification for steel bolts (Unified hexagons and Unified threads) with close tolerance shanks for aircraft BS 2S 96: 964, Specification for 21 /2 per cent nickel-chromium-molybdenum steel (55/65 tonf/sq in: limiting ruling section in) BS 3A 08: 962, 2) 3) 1) 2) 3) Edition current at time of publication (see clauses Referred to in the foreword only Withdrawn © BSI 2- 999 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy and 8) BS 4A 111:1993 BSI — British Standards Institution BS I is the indep endent national b ody res p ons ib le for p rep aring Britis h S tandards It p res ents the UK view on s tandards in E urop e and at the international level It is incorp orated b y Royal C harter Revisions Britis h S tandards are up dated b y amendment or revis ion Us ers of Britis h S tandards should make s ure that they p oss es s the latest amendments or editions It is the constant aim of BS I to imp rove the quality of our p roducts and services We would b e grateful if anyone finding an inaccuracy or amb iguity while us ing this Britis h S tandard would inform the S ecretary of the technical committee res p ons ib le, the identity of which can b e found on the inside front cover Tel: 02 89 96 90 00 Fax: 02 89 96 40 BS I offers memb ers an individual up dating s ervice called PLUS which ens ures that s ub s crib ers automatically receive the lates t editions of s tandards Buying standards O rders for all BS I, international and foreign s tandards p ub lications s hould b e addres s ed to C us tomer S ervices Tel: 899 00 Fax: 899 7001 In res p ons e to orders for international standards , it is BS I p olicy to sup p ly the BS I imp lementation of thos e that have b een p ub lis hed as Britis h S tandards, unless otherwis e requested Information on standards BS I p rovides a wide range of information on national, E urop ean and international standards through its Lib rary and its Technical H elp to E xp orters S ervice Various BS I electronic information s ervices are also availab le which give details on all its p roducts and s ervices C ontact the Information C entre Tel: 02 89 96 71 1 Fax: 02 89 96 048 S ub s crib ing memb ers of BS I are kep t up to date with s tandards develop ments and receive sub s tantial discounts on the p urchase p rice of s tandards For details of thes e and other b enefits contact Memb ership Adminis tration Tel: 02 89 96 70 02 Fax: 02 89 96 00 Copyright C op yright s ub s is ts in all BS I p ub lications BS I als o holds the cop yright, in the UK, of the p ub lications of the international s tandardization b odies E xcep t as p ermitted under the C op yright, D es igns and Patents Act 988 no extract may b e rep roduced, s tored in a retrieval s ystem or transmitted in any form or b y any means – electronic, p hotocop ying, recording or otherwis e – without p rior written p ermis s ion from BS I This does not p reclude the free us e, in the cours e of imp lementing the standard, of necess ary details such as s ymb ols, and size, typ e or grade designations If thes e details are to b e used for any other p urp os e than imp lementation then the p rior written p ermiss ion of BS I must b e ob tained If p ermis sion is granted, the terms may include royalty p ayments or a licensing agreement D etails and advice can b e ob tained from the C op yright Manager BS I 89 C his wick H igh Road London W4 4AL Reprodu ced by I H S u n d er l i cen se wi th BSI - 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