BRITISH STANDARD BS 4A 112 1992 (superseding BS 3A 112 1985) Specification for Cadmium plated steel shear bolts (Unified hexagons and Unified threads) http //dx doi org/10 3403/00285948U http //dx doi[.]
BRITISH STANDARD BS 4A 112: 1992 (superseding BS 3A 112:1985) Specification for Cadmium-plated steel shear bolts (Unified hexagons and Unified threads) BS 4A 112:1992 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Aerospace Standards Policy Committee (ACE/-) to Technical Committee ACE/12, 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 15 December 1992 © BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference ACE/12 Draft for information 92/80172 ISBN 580 21346 Amendments issued since publication Amd No Date Comments BS 4A 112:1992 Contents Page Committees responsible Inside front cover Foreword ii Scope References Procurement Materials and manufacture Mechanical properties for forged bolts in the finally heat-treated condition Anti-corrosion treatment Dimensions Screw threads Table — Dimensions Table — Bearing length L, clamping length M and overall length E List of references Inside back cover © BSI 08-1999 i BS 4A 112:1992 Foreword This edition of this British Standard has been prepared under the direction of the Aerospace Standards Policy Committee and supersedes BS 3A 112:1985 which is withdrawn This edition clarifies the maximum diameter of bolts after plating, but it does not reflect a full review or revision of the standard, which will be undertaken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 0.0003 in plating allowance on the maximum diameter quoted in BS 3A 112 (and preceding editions) is now embodied in the maximum diameter after plating in Table 1, 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 109 Nuts suitable for use with either range of shear bolts are specified in BS 2A 110 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, an inside front cover, pages i and ii, pages to 8, 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 © BSI 08-1999 BS 4A 112:1992 Scope This British Standard specifies materials, dimensions, finish and inspection requirements for steel shear bolts with Unified hexagons and Unified threads and with close tolerance shanks, cadmium plated, to be suitable for insertion in aluminium alloy materials for aerospace use NOTE The latest revision of an Aerospace Series standard is indicated by a prefix number References 2.1 Normative references This British Standard incorporates, by reference, provisions from specific editions of other publications These normative references are cited at the appropriate points in the text and the publications are listed on the inside back cover Subsequent amendments to, or revisions of, any of these publications apply to this standard only when incorporated in it by updating or revision 2.2 Informative references This British Standard refers to other publications that provide information or guidance Editions of these publications current at the time of issue of this standard are listed on the inside back cover, but reference should be made to the latest editions Procurement The bolts shall conform to the latest edition of BS A 100 Materials and manufacture The bolts shall be manufactured by one of the following methods: a) machined from bright drawn bars which conform to BS S 154:1976; NOTE S 96 material may be used until stocks are exhausted b) forged from material which conforms to one of the following British Standards: BS 2S 147:1976 BS 2S 149:1976 BS S 158:1977 © BSI 08-1999 Mechanical properties for forged bolts in the finally heat-treated condition Forged bolts in the finally heat-treated condition shall have the following mechanical properties: a) 0.2 per cent proof stress: not less than 690 MPa: b) tensile strength: 880 MPa to 080 MPa; c) elongation on 5.65 Ỉ So (area): not less than 12 %; d) impact value: not less than 55 J Anti-corrosion treatment All finished bolts shall be coated with cadmium in accordance with DEF STAN 03-19[1] Dimensions 7.1 All finished bolts, after the application of the anti-corrosion coating, shall be in accordance with the dimensions and tolerances given in Table and Table 7.2 The clamping length M of the bolts shall be in accordance with the dimensions and tolerances in Table and shall be such that, when a standard nut without countersink or a ring gauge without countersink has been screwed on as far as possible by hand, its leading face is within the distance M from the underside of the bolt head The runout of the thread shall not exceed twice the pitch 7.3 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 Screw threads The bolts shall have Unified threads of the form and class of fit specified in the latest edition of BS A 100 0.2500 0.3125 0.3750 0.4375 0.5000 0.5625 0.6250 0.7500 0.2493 0.3118 0.3743 0.4368 0.4993 0.5618 0.6243 0.7493 max 0.2501 0.3126 0.3751 0.4376 0.5001 0.5626 0.6251 0.7501 0.2489 0.3112 0.3737 0.4362 0.4987 0.5612 0.6237 0.7487 Decimal Diameter of plain portion of shank equivalent A of nominal size Before After plating plating 0.071 0.083 0.083 0.100 0.100 0.111 0.111 0.125 2X pitch 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 Reference only F2) Minimum length of screwed portion of shank 0.030 0.030 0.030 0.040 0.040 0.040 0.050 0.065 max 0.040 0.040 0.040 0.050 0.050 0.050 0.060 0.075 0.015 0.015 0.015 0.015 0.015 0.015 0.015 0.015 max 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.120 0.120 0.120 0.120 0.120 0.120 0.120 0.120 0.130 0.130 0.130 0.130 0.130 0.130 0.130 0.130 0.433 0.505 0.577 0.650 0.794 0.866 1.010 1.083 0.370 0.431 0.493 0.554 0.679 0.741 0.866 0.929 0.375 0.438 0.500 0.562 0.688 0.750 0.875 0.938 G max R Depth of chamfer max D Radius under bolt head C B Thickness of head Dimensions in inches max Width across corners Width across flats For bearing length L, clamping length M and overall length E see Table 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 1) 2) 1/4 in UNF 5/16 in UNF 3/8 in UNF 7/16 in UNF 1/2 in UNF 9/16 in UNF 5/8 in UNF 3/4 in UNF Nominal size Table — Dimensions BS 4A 112:1992 © BSI 08-1999 BS 4A 112:1992 Table — Bearing length L, clamping length M Table — Bearing length L, clamping length M and overall length E and overall length E Dimensions in inches Dimensions in inches 5/16 in UNF Part No 1/4 in UNF Part No aL M +0 –0.03 E +0.04 –0 aL M +0 –0.03 E +0.04 –0 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 0.51 0.61 0.71 0.81 0.91 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 1.01 1.11 1.21 1.31 1.41 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 1.51 1.61 1.71 1.81 1.91 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 0.50 0.60 0.70 0.80 0.90 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 2.01 2.11 2.21 2.31 2.41 6E 7E 8E 9E 10E 0.6 0.7 0.8 0.9 1.0 0.701 0.801 0.901 0.001 0.101 1.00 1.10 1.20 1.30 1.40 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 2.51 2.61 2.71 2.81 2.91 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 1.50 1.60 1.70 1.80 1.90 2.6 2.7 2.8 2.9 3.0 2.713 2.813 2.913 3.013 3.113 3.01 3.11 3.21 3.31 3.41 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 2.00 2.10 2.20 2.30 2.40 21E 22E 23E 24E 25E 2.1 2.2 2.3 2.4 2.5 2.201 2.301 2.401 2.501 2.601 2.50 2.60 2.70 2.80 2.90 26G 27G 28G 29G 30G 3/8 in UNF 1J 2J 3J 4J 5J a See 7.3 0.1 0.2 0.3 0.4 0.5 0.213 0.313 0.413 0.513 0.613 0.51 0.61 0.71 0.81 0.91 a See 7.3 © BSI 08-1999 BS 4A 112:1992 Table — Bearing length L, clamping length M Table — Bearing length L, clamping length M and overall length E and overall length E Dimensions in inches Part No aL M +0 –0.03 E +0.04 –0 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 1.01 1.11 1.21 1.31 1.41 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 1.51 1.61 1.71 1.81 1.91 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 2.01 2.11 2.21 2.31 2.41 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 2.51 2.61 2.71 2.81 2.91 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 3.01 3.11 3.21 3.31 3.41 31J 32J 33J 34J 35J 7/16 in UNF 1L 2L 3L 4L 5L 3.1 3.2 3.3 3.4 3.5 3.213 3.313 3.413 3.513 3.613 3.51 3.61 3.71 3.81 3.91 0.1 0.2 0.3 0.4 0.5 0.230 0.330 0.430 0.530 0.630 0.54 0.64 0.74 0.84 0.94 6L 7L 0.6 0.7 0.730 0.830 1.04 1.14 a See 7.3 Dimensions in inches Part No aL M +0 –0.03 E +0.04 –0 8L 9L 10L 0.8 0.9 1.0 0.930 1.030 1.130 1.24 1.34 1.44 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 1.54 1.64 1.74 1.84 1.94 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 2.04 2.14 2.24 2.34 2.44 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 2.54 2.64 2.74 2.84 2.94 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 3.04 3.14 3.24 3.34 3.44 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 3.54 3.64 3.74 3.84 3.94 36L 37L 38L 39L 40L 1/2 in UNF 1N 2N 3N a See 7.3 3.6 3.7 3.8 3.9 4.0 3.730 3.830 3.930 4.030 4.130 4.04 4.14 4.24 4.34 4.44 0.1 0.2 0.3 0.230 0.330 0.430 0.54 0.64 0.74 © BSI 08-1999 BS 4A 112:1992 Table — Bearing length L, clamping length M Table — Bearing length L, clamping length M and overall length E and overall length E Dimensions in inches Part No aL M +0 –0.03 E +0.04 –0 4N 5N 0.4 0.5 0.530 0.630 0.84 0.94 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 1.04 1.14 1.24 1.34 1.44 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 1.54 1.64 1.74 1.84 1.94 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 2.04 2.14 2.24 2.34 2.44 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 2.54 2.64 2.74 2.84 2.94 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 3.04 3.14 3.24 3.34 3.44 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 3.54 3.64 3.74 3.84 3.94 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 4.04 4.14 4.24 4.34 4.44 a See 7.3 © BSI 08-1999 Dimensions in inches Part No 41N 42N 43N 44N 45N 9/16 in UNF 1P 2P 3P 4P 5P 6P 7P 8P 9P 10P 11P 12P 13P 14P 15P 16P 17P 18P 19P 20P 21P 22P 23P 24P 25P 26P 27P 28P 29P 30P 31P 32P a See 7.3 aL M +0 –0.03 E +0.04 –0 4.1 4.2 4.3 4.4 4.5 4.230 4.330 4.430 4.530 4.630 4.54 4.64 4.74 4.84 4.94 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 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 2.8 2.9 3.0 3.1 3.2 0.241 0.341 0.441 0.541 0.641 0.741 0.841 0.941 1.041 1.141 1.241 1.341 1.441 1.541 1.641 1.741 1.841 1.941 2.041 2.141 2.241 2.341 2.441 2.541 2.641 2.741 2.841 2.941 3.041 3.141 3.241 3.341 0.55 0.65 0.75 0.85 0.95 1.05 1.15 1.25 1.35 1.45 1.55 1.65 1.75 1.85 1.95 2.05 2.15 2.25 2.35 2.45 2.55 2.65 2.75 2.85 2.95 3.05 3.15 3.25 3.35 3.45 3.55 3.65 BS 4A 112:1992 Table — Bearing length L, clamping length M Table — Bearing length L, clamping length M and overall length E and overall length E Dimensions in inches Part No aL M +0 –0.03 E +0.04 –0 33P 34P 35P 3.3 3.4 3.5 3.441 3.541 3.641 3.75 3.85 3.95 36P 37P 38P 39P 40P 41P 42P 43P 44P 45P 5/8 in UNF 1Q 2Q 3Q 4Q 5Q 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 3.741 3.841 3.941 4.041 4.141 4.241 4.341 4.441 4.541 4.641 4.05 4.15 4.25 4.35 4.45 4.55 4.65 4.75 4.85 4.95 0.1 0.2 0.3 0.4 0.5 0.241 0.341 0.441 0.541 0.641 0.56 0.66 0.76 0.86 0.96 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 1.06 1.16 1.26 1.36 1.46 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 1.56 1.66 1.76 1.86 1.96 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 2.06 2.16 2.26 2.36 2.46 21Q 22Q 23Q 2.1 2.2 2.3 2.241 2.341 2.441 2.56 2.66 2.76 a See 7.3 Dimensions in inches Part No aL M +0 –0.03 E +0.04 –0 24Q 25Q 2.4 2.5 2.541 2.641 2.86 2.96 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 3.06 3.16 3.26 3.36 3.46 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 3.56 3.66 3.76 3.86 3.96 36Q 37Q 38Q 39Q 40Q 3.6 3.7 3.8 3.9 4.0 3.741 3.841 3.941 4.014 4.141 4.06 4.16 4.26 4.36 4.46 41Q 42Q 43Q 44Q 45Q 3/4 in UNF 1S 2S 3S 4S 5S 4.1 4.2 4.3 4.4 4.5 4.241 4.341 4.441 4.541 4.641 4.56 4.66 4.76 4.86 4.96 0.1 0.2 0.3 0.4 0.5 0.255 0.355 0.455 0.555 0.655 0.59 0.69 0.79 0.89 0.99 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 1.09 1.19 1.29 1.39 1.49 11S 12S 13S 1.1 1.2 1.3 1.255 1.355 1.455 1.59 1.69 1.79 a See 7.3 © BSI 08-1999 BS 4A 112:1992 Table — Bearing length L, clamping length M and overall length E Dimensions in inches Part No aL M +0 –0.03 E +0.04 –0 14S 15S 1.4 1.5 1.555 1.655 1.89 1.99 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 2.09 2.19 2.29 2.39 2.49 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 2.59 2.69 2.79 2.89 2.99 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 3.09 3.19 3.29 3.39 3.49 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 3.59 3.69 3.79 3.89 3.99 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 4.09 4.19 4.29 4.39 4.49 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 4.59 4.69 4.79 4.89 4.99 a See 7.3 © BSI 08-1999 blank BS 4A 112:1992 List of references (see clause 2) Normative references BSI standards publications BRITISH STANDARDS INSTITUTION, London BS 3A 100:1991, Specification for general requirements for bolts and free running nuts of tensile strength not exceeding 1249 MPa1) BS 2S 147:1976, Specification for % nickel-chromium-molybdenum steel bars for the manufacture of forged bolts and forged nuts BS 2S 149:1976, Specification for 75 % nickel-chromium-molybdenum steel bars for the manufacture of forged bolts and forged nuts BS S 154:1976, Specification 2½ % nickel-chromium-molybdenum steel billets, bars, forgings and parts (880–1080 MPa: limiting ruling section 150 mm) BS S 158:1977, Specification for % chromium-molybdenum steel bars for the manufacture of forged bolts and forged nuts Other references [1] DEF STAN 03-19 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 BS 3A 109:1985, Specification for steel shear bolts (Unified hexagons and United threads)2) BS 2A 110:1962, Specification for steel nuts (Unified hexagons and Unified threads) for shear bolts for aircraft2) BS 2S 96:1964, Specification for 2½ per cent nickel-chromium-molybdenum steel (55/65 tonf/sq in: limiting ruling section in)3) 1) Edition current at time of publication 2) Referred to in the foreword only 3) Withdrawn © BSI 08-1999 (see clauses and ) BS 4A 112: 1992 BSI — British Standards Institution BSI is the independent national 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