1、BRITISH STANDARD BS 2A 25:1962 Incorporating Amendment Nos.1,2,3,4 and5 Specification for Steel hexagonal-headed bolts (B.A. and B.S.F. threads) for aircraft UDC621.882.212.082.1/.2:669.14:629.13BS2A25:1962 This BritishStandard, having been approved by the Aircraft Industry Standards Committee and e
2、ndorsed by the Chairman ofthe Engineering Divisional Council, was published undertheauthority of theGeneralCouncil of the Institution on 17 May1962 BSI03-2000 The following BSI references relate to the work on this standard: Committee reference ACE/12 Draft for comment AB (ACE)2148 ISBN 0 580 34557
3、2 Foreword This revision of BS 2A 25:1950 has been prepared to relate this standard to the relevant requirements of the latest edition of BS A100. Reference is made to the following British Standards: BS A100, General requirements for bolts and nuts of tensile strength not exceeding180000lbf/in 2 (1
4、25hbar). BS S147, Specification for0.5% nickel-chromium-molybdenum steel (bars for the manufacture of forged bolts only). BS S148, Specification for low nickel-chromium steel (bars for the manufacture of forged bolts only). BS S149, Specification for1.75% nickel-chromium-molybdenum steel bars for th
5、e manufacture of forged bolts and forged nuts. BS S154, Specification.2“ % nickel-chromium-molybdenum steel billets, bars, forgings and parts(8801080MPa: limiting ruling section150mm). BS S158, Specification for1% chromium-molybdenum steel bars for the manufacture of forged bolts and forged nuts. NO
6、TE 1The values in MPa are to be regarded as the standard for mechanical properties. Toconvert MPa to “ton force” (abbreviated to tonf) reference should be made to BS350. NOTE 2 a) British Standard material BS S96, BS S114 and BS S117 may be used until stocks are exhausted. b) Parts made in BS S96, B
7、S S114 and BS S117 material may be used until stocks are exhausted. 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 immuni
8、ty from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to8, 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 amend
9、ment table on the inside front cover. Amendments issued since publication Amd. No. Date of issue Comments 4726 November 1962 5298 August1964 2106 October 1976 5751 November 1987 6082 November 1990 Indicated by a sideline in the marginBS2A25:1962 BSI 03-2000 i Contents Page Foreword Inside front cove
10、r 1 Scope 1 2 General requirements 1 3 Material and manufacture 1 4 Dimensions 1 5 Screw threads 1 6 Anti-corrosion treatment 1 7 Inspection procedure 1 Appendix Table for conversion of inches to approximate millimetre equivalents Inside back cover Figure 1 Bolts machined from bar 2 Figure 2 Enlarge
11、d view of indentification groove 2 Figure 3 Alternative form of bolt head at the option of the bolt manufacturer 2 Figure 4 Forged bolts 2 Figure 5 Enlarged view of indentification ring 2 Figure 6 Alternative form of bolt head at the option of the bolt manufacturer 2 Figure 7 4 Table 1 Dimensions 2
12、Table 2 Length of plain portion of shank L, and overall length E 4ii blankBS2A25:1962 BSI 03-2000 1 1 Scope This BritishStandard specifies the materials, dimensions, finish and inspection requirements for steel hexagonal headed bolts with B.A. and B.S.F. threads for aircraft. 2 General requirements
13、The bolts shall comply with the relevant requirements of Part1 of BS A 100 in respect of manufacture, screw threads, anti-corrosion treatment, identification and marking. 3 Material and manufacture a) The bolts shall be manufactured by one of the following methods: i) Machined from bright drawn bars
14、 which comply with the latest issue of one of the following British Standards: BS S 154 ii) Forged from material which complies with the latest issue of one of the following British Standards: BS S 105 bolts up to and including “ in diameter only or BS S 147 or BS S 148 or BS S 149 or BS S 158 b) In
15、 the finally heat-treated condition, the mechanical properties of the material used for forged bolts shall be as follows: 4 Dimensions a) All finished bolts, after the application of the anti-corrosion coating, shall conform to the dimensions and tolerances given in Table 1 and Table 2. b) The lengt
16、h of the plain portion of the shank shall conform to the dimensions and tolerances given in Table 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 L from the
17、underside of the bolt head. The runout of thread shall not exceed twice the pitch. 5 Screw threads The bolts shall have B.A. or B.S.F. threads of the form and class of fit specified in the relevant requirements of BS A 100, Part 1. 6 Anti-corrosion treatment All finished bolts shall be coated with c
18、admium. 7 Inspection procedure The bolts shall be inspected in accordance with the relevant requirements of BS A 100, Part 2. 0.2percent proof stress 690MPa (minimum) Tensile strength 880/1080MPa Elongation on5.65 area12percent minimum Impact value 55J(40ftlbf)BS 2A 25:1962 2 BSI 03-2000 Table 1 Dim
19、ensions Figure 2 Enlarged view of indentification groove Figure 1 Bolts machined from bar Figure 3 Alternative form of bolt head at the option of the bolt manufacturer Figure 5 Enlarged view of indentification ring Figure 4 Forged bolts Figure 6 Alternative form of bolt head at the option of the bol
20、t manufacturer *For length of plain portion of shank L and overall length E, seeTable 2.BS 2A 25:1962 BSI 03-2000 3Table 1 Dimensions 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Nominal size Diameter of plain portion of shank Minimum length of screwed portion of shank Width across flats Width acros
21、s corners Thickness of head Radius under bolt head Depth of chamfer Identification groove Identification ring A F a B C D R G Radius Q Dia. S Dia. W Radius P Depth V max. min. For reference only max. min. max. max. min. max. min. max. min. 6 4 2 BA BA BA 2.8 mm 3.6 mm 4.7 mm in 0.1102 0.1417 0.1850
22、in 0.1072 0.1387 0.1820 in 0.29 0.33 0.37 in 0.193 0.248 0.324 in 0.188 0.243 0.319 in 0.22 0.29 0.37 in 0.068 0.086 0.113 in 0.063 0.080 0.106 in 0.015 0.015 0.020 in 0.005 0.005 0.010 in 0.020 0.030 0.040 in 0.015 0.020 0.030 in 0.010 0.010 0.010 in 0.200 0.250 0.330 in 0.184 0.238 0.314 in 0.012
23、0.012 0.015 in 0.012 0.012 0.015 1 / 4in BSF 5 / 16in BSF 3 / 8in BSF 7 / 16in BSF 1 / 2in BSF 9 / 16in BSF 5 / 8in BSF 3 / 4in BSF 7 / 8in BSF 1 in BSF 0.2500 in 0.3125 in 0.3750 in 0.4375 in 0.5000 in 0.5625 in 0.6250 in 0.7500 in 0.8750 in 1.0000 in 0.2495 0.3120 0.3745 0.4370 0.4995 0.5620 0.624
24、5 0.7495 0.8745 0.9995 0.2465 0.3090 0.3715 0.4335 0.4960 0.5585 0.6205 0.7455 0.8705 0.9955 0.42 0.47 0.57 0.61 0.71 0.76 0.85 1.14 1.34 1.44 0.445 0.525 0.600 0.710 0.820 0.920 1.010 1.200 1.300 1.480 0.438 0.518 0.592 0.702 0.812 0.912 1.000 1.190 1.288 1.468 0.51 0.61 0.69 0.82 0.95 1.06 1.17 1.
25、39 1.50 1.71 0.150 0.180 0.220 0.270 0.300 0.350 0.390 0.480 0.530 0.620 0.140 0.170 0.210 0.260 0.290 0.340 0.380 0.470 0.520 0.610 0.030 0.030 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 0.015 0.015 0.040 0.040 0.040 0.050 0.050 0.050 0.060 0.075
26、 0.075 0.075 0.030 0.030 0.030 0.040 0.040 0.040 0.050 0.065 0.065 0.065 0.010 0.010 0.010 0.020 0.020 0.020 0.020 0.020 0.040 0.040 0.450 0.530 0.610 0.720 0.830 0.940 1.030 1.230 1.330 1.530 0.430 0.510 0.582 0.692 0.797 0.897 0.980 1.170 1.265 1.440 0.020 0.020 0.020 0.025 0.025 0.025 0.025 0.030
27、 0.030 0.035 0.020 0.020 0.020 0.025 0.025 0.025 0.025 0.030 0.030 0.035 a This dimension is an absolute minimum associated with maximum length L and minimum length E. It is not intended for use for manufacturing or inspection purposes.BS2A25:1962 4 BSI 03-2000 Table 2 Length of plain portion of sha
28、nk L and overall length E Figure 7 6 B.A. 4 B.A. 2 B.A. 1 / 4in B.S.F. 5 / 16in B.S.F. Part No. L E Part No. L E Part No. L E Part No. L E Part No. L E ;A 1A 2A 3A 4A 5A 6A 7A 8A 9A 10A in 0.05 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 in 0.40 0.45 0.55 0.65 0.75 0.85 0.95 1.05 1.15 1.25 1.35 ;B 1B 2B
29、 3B 4B 5B 6B 7B 8B 9B 10B in 0.05 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 in 0.45 0.50 0.60 0.70 0.80 0.90 1.00 1.10 1.20 1.30 1.40 ;C 1C 2C 3C 4C 5C 6C 7C 8C 9C 10C in 0.05 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 in 0.50 0.55 0.65 0.75 0.85 0.95 1.05 1.15 1.25 1.35 1.45 1E 2E 3E 4E 5E 6E 7E 8E 9E 1
30、0E in 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 in 0.60 0.70 0.80 0.90 1.00 1.10 1.20 1.30 1.40 1.50 1G 2G 3G 4G 5G 6G 7G 8G 9G 10G in 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 in 0.65 0.75 0.85 0.95 1.05 1.15 1.25 1.35 1.45 1.55 11A 12A 13A 14A 15A 1.1 1.2 1.3 1.4 1.5 1.45 1.55 1.65 1.75 1.85 11B 12B 1
31、3B 14B 15B 1.1 1.2 1.3 1.4 1.5 1.50 1.60 1.70 1.80 1.90 11C 12C 13C 14C 15C 1.1 1.2 1.3 1.4 1.5 1.54 1.65 1.75 1.85 1.95 11E 12E 13E 14E 15E 1.1 1.2 1.3 1.4 1.5 1.60 1.70 1.80 1.90 2.00 11G 12G 13G 14G 15G 1.1 1.2 1.3 1.4 1.5 1.65 1.75 1.85 1.95 2.05 16A 17A 18A 1.6 1.7 1.8 1.95 2.05 2.15 16B 17B 18
32、B 1.6 1.7 1.8 2.00 2.10 2.20 16C 17C 18C 1.6 1.7 1.8 2.05 2.15 2.25 16E 17E 18E 1.6 1.7 1.8 2.10 2.20 2.30 16G 17G 18G 1.6 1.7 1.8 2.15 2.25 2.35 19A 20A 21A 1.9 2.0 2.1 2.25 2.35 2.45 19B 20B 21B 1.9 2.0 2.1 2.30 2.40 2.50 19C 20C 21C 1.9 2.0 2.1 2.35 2.45 2.55 19E 20E 21E 1.9 2.0 2.1 2.40 2.50 2.6
33、0 19G 20G 21G 1.9 2.0 2.1 2.45 2.55 2.65 22A 23A 24A 2.2 2.3 2.4 2.55 2.65 2.75 22B 23B 24B 2.2 2.3 2.4 2.60 2.70 2.80 22Ct 23C 24C 2.2 2.3 2.4 2.65 2.75 2.85 22E 23E 24E 2.2 2.3 2.4 2.70 2.80 2.90 22G 23G 24G 2.2 2.3 2.4 2.75 2.85 2.95 25A 26A 27A 2.5 2.6 2.7 2.85 2.95 3.05 25B 26B 27B 2.5 2.6 2.7
34、2.90 3.00 3.10 25C 26C 27C 2.5 2.6 2.7 2.95 3.05 3.15 25E 26E 27E 2.5 2.6 2.7 3.00 3.10 3.20 25G 26G 27G 2.5 2.6 2.7 3.05 3.15 3.25 28B 29B 30B 2.8 2.9 3.0 3.20 3.30 3.40 28C 29C 30C 2.8 2.9 3.0 3.25 3.35 3.45 28E 29E 30E 2.8 2.9 3.0 3.30 3.40 3.50 28G 29G 30G 2.8 2.9 3.0 3.35 3.45 3.55 31B 32B 33B
35、34B 35B 36B 3.1 3.2 3.3 3.4 3.5 3.6 3.50 3.60 3.70 3.80 3.90 4.00 31C 32C 33C 34C 35C 36C 3.1 3.2 3.3 3.4 3.5 3.6 3.55 3.65 3.75 3.84 3.95 4.05 31E 32E 33E 34E 35E 36E 3.1 3.2 3.3 3.4 3.5 3.6 3.60 3.70 3.80 3.90 4.00 4.10 31G 32G 33G 34G 35G 36G 3.1 3.2 3.3 3.4 3.5 3.6 3.65 3.75 3.85 3.95 4.05 4.15
36、Bolts below the heavy line may not be readily available in large quantities because of limitations in manufacture by forging. +0.04 0 +0.04 0 +0.04 0 +0.04 0 +0.04 0 +0.04 0 +0.04 0 +0.04 0 +0.04 0 +0.04 0BS2A25:1962 BSI 03-2000 5Table 2 Length of plain portion of shank L and overall length E 6 B.A.
37、 4 B.A. 2 B.A. 1 / 4in B.S.F. 5 / 16in B.S.F. Part No. L E Part No. L E Part No. L E Part No. L E Part No. L E in in 37B 38B 39B 40B 41B 42B 43B 44B 45B 46B 47B 48B 49B 50B 51B 52B 53B in 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 in 4.10 4.20 4.30 4.40 4.50 4.60 4.70 4.80 4
38、.90 5.00 5.10 5.20 5.30 5.40 5.50 5.60 5.70 37C 38C 39C 40C 41C 42C 43C 44C 45C 46C 47C 48C 49C 50C 51C 52C 53C 54C 55C 56C 57C 58C 59C 60C in 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 6.0 in 4.15 4.25 4.35 4.45 4.55 4.65 4.75 4.85 4.95 5.05 5.15 5.2
39、5 5.35 5.45 5.55 5.65 5.75 5.85 5.95 6.05 6.15 6.25 6.35 6.45 37E 38E 39E 40E 41E 42E 43E 44E 45E 46E 47E 48E 49E 50E 51E 52E 53E 54E 55E 56E 57E 58E 59E 60E in 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 6.0 in 4.20 4.30 4.40 4.50 4.60 4.70 4.80 4.90
40、5.00 5.10 5.20 5.30 5.40 5.50 5.60 5.70 5.80 5.90 6.00 6.10 6.20 6.30 6.40 6.50 37G 38G 39G 40G 41G 42G 43G 44G 45G 46G 47G 48G 49G 50G 51G 52G 53G 54G 55G 56G 57G 58G 59G 60G 61G 62G 63G 64G 65G 66G 67G 68G 69G 70G in 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5
41、.7 5.8 5.9 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 7.0 in 4.25 4.35 4.45 4.55 4.65 4.75 4.85 4.95 5.05 5.15 5.25 5.35 5.45 5.55 5.65 5.75 5.85 5.95 6.05 6.15 6.25 6.35 6.45 6.55 6.65 6.75 6.85 6.95 7.05 7.15 7.25 7.35 7.45 7.55 Seefootnote on page4. +0.04 0 +0.04 0 +0.04 0 +0.04 0 +0.04 0 +0.04 0 +0
42、.04 0 +0.04 0 +0.04 0 +0.04 0 BS2A25:1962 6 BSI 03-2000Table 2 Length of plain portion of shank L and overall length E 3 / 8in B.S.F. 7 / 16in B.S.F. 1 / 2in B.S.F. 9 / 16in B.S.F. 5 / 6in B.S.F. Part No. L E Part No. L E Part No. L E Part No. L E Part No. L E 2J 3J 4J 5J 6J 7J 8J 9J 10J 11J 12J 13J
43、 14J 15J 16J 17J 18J 19J 20J 21J 22J 23J 24J 25J 26J 27J 28J 29J 30J in 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 in 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
44、 3.05 3.15 3.25 3.35 3.45 3.55 3.65 2L 3L 4L 5L 6L 7L 8L 9L 10L 11L 12L 13L 14L 15L 16L 17L 18L 19L 20L 21L 22L 23L 24L 25L 26L 27L 28L 29L 30L in 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 in 0.90 1.00 1.10 1.20 1.30 1.40 1.50
45、 1.60 1.70 1.80 1.90 2.00 2.10 2.20 2.30 2.40 2.50 2.60 2.70 2.80 2.90 3.00 3.10 3.20 3.30 3.40 3.50 3.60 3.70 2N 3N 4N 5N 6N 7N 8N 9N 10N 11N 12N 13N 14N 15N 16N 17N 18N 19N 20N 21N 22N 23N 24N 25N 26N 27N 28N 29N 30N in 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.
46、1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 in 1.00 1.10 1.20 1.30 1.40 1.50 1.60 1.70 1.80 1.90 2.00 2.10 2.20 2.30 2.40 2.50 2.60 2.70 2.80 2.90 3.00 3.10 3.20 3.30 3.40 3.50 3.60 3.70 3.80 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 in 0.2
47、 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 in 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 3.75 3.85 2Q 3Q 4Q 5Q 6Q 7Q 8Q 9Q 10Q 11Q 12Q 13Q
48、 14Q 15Q 16Q 17Q 18Q 19Q 20Q 21Q 22Q 23Q 24Q 25Q 26Q 27Q 28Q 29Q 30Q in 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 in 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
49、 3.35 3.45 3.55 3.65 3.75 3.85 3.95 31J 32J 33J 34J 35J 36J 37J 38J 39J 40J 41J 42J 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 3.75 3.85 3.95 4.05 4.15 4.25 4.35 4.45 4.55 4.65 4.75 4.85 31L 32L 33L 34L 35L 36L 37L 38L 39L 40L 41L 42L 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 3.80 3.90 4.00 4.10 4.20 4.30 4.40 4.50 4.60 4.70 4.80 4.90 31N 32N 33N 34N 35N 36N 37N 38N 39N 40N 41N 42N 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 3.90 4.00 4.10 4.20 4.30 4.40 4.50 4.60 4.70 4.80 4.90 5.00 3
