1、BRITISH STANDARD BS 4A 112: 1992 (superseding BS3A112:1985) Specification for Cadmium-plated steel shear bolts (Unifiedhexagons and Unified threads)BS4A 112:1992 This British Standard, having been prepared under the directionof the Aerospace Standards Policy Committee, waspublished under the authori
2、tyof the Standards Boardand comes into effect on 15December 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 0 580 21346 3 Committees responsible for this British Standard The preparation of this British
3、 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 Defenc
4、e Society of British Aerospace Companies Ltd. Amendments issued since publication Amd. No. Date CommentsBS4A 112:1992 BSI 08-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Procurement 1 4 Materials and manufacture 1 5 Mechanical properties for f
5、orged bolts in the finally heat-treated condition 1 6 Anti-corrosion treatment 1 7 Dimensions 1 8 Screw threads 1 Table 1 Dimensions 2 Table 2 Bearing length L, clamping length M and overall length E 3 List of references Inside back coverBS4A 112:1992 ii BSI 08-1999 Foreword This edition of this Bri
6、tish Standard has been prepared under the direction of the Aerospace Standards Policy Committee and supersedes BS3A112:1985 which is withdrawn.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 underta
7、ken in due course. The0.0003 in plating allowance on the maximum diameter quoted inBS3A112 (and preceding editions) is now embodied in the maximum diameter after plating inTable 1, and separate reference to a plating allowance has been deleted. The maximum diameter of bolts before plating has been d
8、eleted and the thickness of plating is now controlled. An equivalent range of bolts with unplated shanks is specified in BS3A109. Nuts suitable for use with either range of shear bolts are specified inBS2A110. A British Standard does not purport to include all the necessary provisions of a contract.
9、 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, pagesi andii, pages1to8, an inside back cover and a
10、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.BS4A 112:1992 BSI 08-1999 1 1 Scope This British Standard specifies materials, dimensions, finish and inspection requireme
11、nts 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. NOTEThe latest revision of an Aerospace Series standard is indicated by a prefix number. 2 References 2.1
12、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
13、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
14、are listed on the inside back cover, but reference should be made to the latest editions. 3 Procurement The bolts shall conform to the latest edition of BSA100. 4 Materials and manufacture The bolts shall be manufactured by one of the following methods: a) machined from bright drawn bars which confo
15、rm to BSS154:1976; NOTES96 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 BSS 158:1977 5 Mechanical properties for forged bolts in the finally heat-treated condition Forged bolts in the
16、finally heat-treated condition shall have the following mechanical properties: a) 0.2 per cent proof stress: not less than690MPa: b) tensile strength: 880MPa to1080MPa; c) elongation on5.65 S o(area): not less than12%; d) impact value: not less than55J. 6 Anti-corrosion treatment All finished bolts
17、shall be coated with cadmium in accordance with DEFSTAN03-191. 7 Dimensions 7.1 All finished bolts, after the application of the anti-corrosion coating, shall be in accordance with the dimensions and tolerances given inTable 1 andTable 2. 7.2 The clamping length M of the bolts shall be in accordance
18、 with the dimensions and tolerances inTable 2 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 sh
19、all 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. 8 Screw threads The bolts shall have Unified threads of the form and class of fit specified in the latest edition of
20、 BSA100. BS 4A 112:1992 2 BSI 08-1999 Table 1 Dimensions Dimensions in inches Nominal size Decimal equivalent of nominal size Diameter of plain portion of shank A 2X pitch Minimum length of screwed portion of shank F 2) Width across flats B Width across corners C Thickness of head D Radius under bol
21、t head R Depth of chamfer G Before plating After plating min. max. min. Reference only max. min. max. max. min. max. min. max. min. 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 0.2500 0.3125 0.3750 0.4375 0.5000 0.5625 0.6250 0.7500 0.2489 0.3112 0.3737
22、0.4362 0.4987 0.5612 0.6237 0.7487 0.2501 0.3126 0.3751 0.4376 0.5001 0.5626 0.6251 0.7501 0.2493 0.3118 0.3743 0.4368 0.4993 0.5618 0.6243 0.7493 0.071 0.083 0.083 0.100 0.100 0.111 0.111 0.125 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.375 0.438 0.500 0.562 0.688 0.750 0.875 0.938 0.370 0.431 0.493
23、 0.554 0.679 0.741 0.866 0.929 0.433 0.505 0.577 0.650 0.794 0.866 1.010 1.083 0.130 0.130 0.130 0.130 0.130 0.130 0.130 0.130 0.120 0.120 0.120 0.120 0.120 0.120 0.120 0.120 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.015 0.015 0.015 0.015 0.015 0.015 0.015 0.015 0.040 0.040 0.040 0.050 0.050
24、 0.050 0.060 0.075 0.030 0.030 0.030 0.040 0.040 0.040 0.050 0.065 1)For bearing length L, clamping length M and overall length E seeTable 2 2)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 purpo
25、ses.BS4A 112:1992 BSI 08-1999 3 Table 2 Bearing length L, clamping length M and overall length E Table 2 Bearing length L, clamping length M and overall length E Dimensions in inches 1/4 in UNF Part No. a L min. M E 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
26、 0.90 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 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 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 2
27、4E 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 a See7.3. +0 0.03 +0.04 0 Dimensions in inches 5/16 in UNF Part No. a L min. M E 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
28、 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 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 21G 22G 23G 24G 25G 2.1 2.2 2.3 2.4 2.5 2.213 2.313 2.413 2.513 2.
29、613 2.51 2.61 2.71 2.81 2.91 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 3.01 3.11 3.21 3.31 3.41 3/8 in UNF 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 0.51 0.61 0.71 0.81 0.91 a See7.3. +0 0.03 +0.04 0BS4A 112:1992 4 BSI 08-1999 Table 2 Bearing length
30、 L, clamping length M and overall length E Table 2 Bearing length L, clamping length M and overall length E Dimensions in inches Part No. a L min. M E 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
31、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 3.0
32、1 3.11 3.21 3.31 3.41 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 3.51 3.61 3.71 3.81 3.91 7/16 in UNF 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 0.54 0.64 0.74 0.84 0.94 6L 7L 0.6 0.7 0.730 0.830 1.04 1.14 a See7.3. +0 0.03 +0.04 0 Dimensions in inche
33、s Part No. a L min. M E 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
34、 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 3.6 3.7 3.8 3.9 4.0 3.730
35、3.830 3.930 4.030 4.130 4.04 4.14 4.24 4.34 4.44 1/2 in UNF 1N 2N 3N 0.1 0.2 0.3 0.230 0.330 0.430 0.54 0.64 0.74 a See7.3. +0 0.03 +0.04 0BS4A 112:1992 BSI 08-1999 5 Table 2 Bearing length L, clamping length M and overall length E Table 2 Bearing length L, clamping length M and overall length E Dim
36、ensions in inches Part No. a L min. M E 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.
37、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
38、.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 See7.3. +0 0.03 +0.04 0 Dimensions in inches Part No. a L min. M E 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 4.54 4.64 4.74 4.84 4.94
39、 9/16 in UNF 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 0.55 0.65 0.75 0.85 0.95 6P 7P 8P 9P 10P 0.6 0.7 0.8 0.9 1.0 0.741 0.841 0.941 1.041 1.141 1.05 1.15 1.25 1.35 1.45 11P 12P 13P 14P 15P 1.1 1.2 1.3 1.4 1.5 1.241 1.341 1.441 1.541 1.641 1.55 1.65 1.75 1.85 1.95 16P 17P 18P
40、 19P 20P 1.6 1.7 1.8 1.9 2.0 1.741 1.841 1.941 2.041 2.141 2.05 2.15 2.25 2.35 2.45 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 2.55 2.65 2.75 2.85 2.95 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 3.05 3.15 3.25 3.35 3.45 31P 32P 3.1 3.2 3.241 3.34
41、1 3.55 3.65 a See7.3. +0 0.03 +0.04 0BS4A 112:1992 6 BSI 08-1999 Table 2 Bearing length L, clamping length M and overall length E Table 2 Bearing length L, clamping length M and overall length E Dimensions in inches Part No. a L min. M E 33P 34P 35P 3.3 3.4 3.5 3.441 3.541 3.641 3.75 3.85 3.95 36P 3
42、7P 38P 39P 40P 41P 42P 43P 44P 45P 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 5/8 in UNF 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 0.56 0.66 0.76 0.86 0.96 6Q 7Q 8Q 9Q 10
43、Q 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 2.3
44、41 2.441 2.56 2.66 2.76 a See7.3. +0 0.03 +0.04 0 Dimensions in inches Part No. a L min. M E 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
45、 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 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 3/4 in UNF 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 0.59 0.69 0.7
46、9 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 See7.3. +0 0.03 +0.04 0BS4A 112:1992 BSI 08-1999 7 Table 2 Bearing length L, clamping length M and overall length E Dimensions in inches P
47、art No. a L min. M E 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
48、 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.
49、655 4.59 4.69 4.79 4.89 4.99 a See 7.3. +0 0.03 +0.04 08 blankBS4A112:1992 BSI 08-1999 List of references (seeclause2) 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 exceeding1249MPa 1) . BS 2S 147:1976, Specification for0.5% nickel-chromium-molybdenum steel bars for the manufacture of forged bolts and forged nuts. BS 2S 149:1976, Specification for1.75% nickel-chromium-molybdenum
