1、BRITISH STANDARD BS 4A 111:1993 (superseding BS 3A 111:1962) Specification for Cadmium-plated steel bolts (Unifiedhexagons and Unified threads) with close tolerance shanksBS4A 111:1993 This British Standard, having been prepared under the directionof the Aerospace Standards Policy Committee, waspubl
2、ished under the authorityof the Standards Boardand comes into effect on 15April1993 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference ACE/12 Draft announced in BSI News February1993 ISBN 0 580 21647 0 Committees responsible for this British Standard Th
3、e preparation of this British Standard was entrusted by the Aerospace Systems 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 Fa
4、steners Federation Ministry of Defence Society of British Aerospace Companies Ltd. Amendments issued since publication Amd. No. Date CommentsBS4A 111:1993 BSI 12-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Procurement 1 4 Materials and manufa
5、cture 1 5 Anti-corrosion treatment 1 6 Dimensions 1 7 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 111:1993 ii BSI 12-1999 Foreword This edition of this British Standard has been prepared under the di
6、rection of the Aerospace Standards Policy Committee and supersedesBS3A111:1962 which is withdrawn.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. The0.0003in plating allowan
7、ce on the maximum diameter quoted in BS3A111 (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 deleted and the thickness of plating is now con
8、trolled. An equivalent range of bolts with unplated shanks is specified in BS3A108. 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 itse
9、lf confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to4, 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 indica
10、ted in the amendment table on the inside front cover.BS4A 111:1993 BSI 12-1999 1 1 Scope This British Standard specifies the materials, dimensions, finish and inspection requirements for steel bolts with Unified hexagons, Unified threads and close tolerance shanks cadmium plated to be suitable for i
11、nsertion in aluminium alloy materials, for aircraft. 2 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 li
12、sted 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. Edition
13、s 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. 3 Procurement The bolts shall conform to the latest edition of BSA100. 4 Materials and manufacture 4.1 The bolts shall be manufactured by on
14、e of the following methods: a) machined from bright drawn bars which conform to the followingBritishStandards: BS3S 95:1967 or BS2S 114:1964 or BS2S 116:1964 bolts up to and including 3 / 8in diameter; or BS2S 117:1964 or BSS154:1976 NOTEBSS96 material may be used until stocks are exhausted. b) forg
15、ed from material which conforms to the following British Standards: BS3S 102:1969 or BS3S 105:1969 or BS2S 147:1976 or BS S 148:1969 or BS2S 149:1976 or BSS 158:1977 4.2 In the finally heat-treated condition, the mechanical properties of the material used for forged bolts shall be as follows: 5 Anti
16、-corrosion treatment All finished bolts shall be coated with cadmium in accordance with DEF STAN03-191. 6 Dimensions 6.1 All finished bolts, after the application of the cadmium coating, shall conform to the dimensions and tolerances given inTable 1 andTable 2. 6.2 The clamping length of the bolt sh
17、all conform to the dimensions and tolerances given inTable 2, and shall be such that when a standard nut without countersink or 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
18、thread shall not exceed twice the pitch. 6.3 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. 7 Screw threads The bolts shall have Unified threads of the form and class of fit specified in the latest e
19、dition of BSA100. 0.1% proof stress not less than 664 MPa (43 tonf/in 2 ) tensile strength not less than 850 MPa (55 tonf/in 2 ) not more than 1 003 MPa (65 tonf/in 2 ) elongation on 4 area not less than 18% Izod impact value: not less than 54 J (40 ftlbf)BS 4A 111:1993 2 BSI 12-1999 Table 1 Dimensi
20、ons Dimensions in inches 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 2 pitch Minimum length of screwed portion of shank Width across flats Width across corners Thickness of head Radius under bolt head Depth of chamfer Identification disk A Diameter De
21、pth Diameter of plain portion of shank Thread Before plating After plating F 2) B C D R G K H Min. Max. Min. Reference only Max. Min. Max. Max. Min. Max. Min. Max. Min. 0.190 1 / 4 5 / 16 3 / 8 7 / 16 1 / 2 No. 10-32 UNF 1 / 4in UNF 5 / 16in UNF 3 / 8in UNF 7 / 16in UNF 1 / 2in UNF 0.1887 0.2489 0.3
22、112 0.3737 0.4362 0.4987 0.1899 0.2501 0.3126 0.3751 0.4376 0.5001 0.1891 0.2493 0.3118 0.3743 0.4368 0.4993 0.063 0.071 0.083 0.083 0.100 0.100 0.377 0.459 0.497 0.597 0.670 0.770 0.344 0.438 0.500 0.562 0.688 0.750 0.339 0.431 0.493 0.554 0.679 0.741 0.397 0.505 0.577 0.650 0.794 0.866 0.115 0.150
23、 0.180 0.220 0.270 0.300 0.105 0.140 0.170 0.210 0.260 0.290 0.020 0.030 0.030 0.030 0.030 0.030 0.010 0.015 0.015 0.015 0.015 0.015 0.030 0.040 0.040 0.040 0.050 0.050 0.020 0.030 0.030 0.030 0.040 0.040 0.33 0.43 0.49 0.55 0.67 0.74 0.03 0.03 0.03 0.03 0.03 0.03 1)For bearing length L, clamping le
24、ngth 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 purposes. 0 0.01BS4A 111:1993 BSI 12-1999 3 Table 2 Bearing length L, clamping length M and overall length
25、 E Dimensions in inches No. 10-32 UNF 1 / 4in UNF 5 / 16in UNF Part No. L amin.M E Part No. L amin.M E Part No. L amin.M E 1 / 2D 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
26、 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
27、 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
28、.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
29、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
30、 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
31、3.75 3.85 3.95 4.05 4.15 36G 37G 3.6 3.7 3.713 3.813 4.25 4.35 NOTEBolts below the heavy line may not be readily available in large quantities because of limitations in manufacture by forging. a See6.3. 0 0.03 +0.04 0 0 0.03 +0.04 0 0 0.03 +0.04 0BS4A 111:1993 4 BSI 12-1999 Table 2 Bearing length L,
32、 clamping length M and overall length E 3 / 8in UNF 7 / 16in UNF 1 / 2in UNF Part No. L bmin. M E Part No. L bmin.M E Part No. L bmin.M E 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.
33、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 9
34、N 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
35、.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 1.73
36、0 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
37、 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
38、 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
39、 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 NOTEBolts
40、 below the heavy line may not be readily available in large quantities because of limitations in manufacture by forging. b See6.3. 0 0.03 +0.04 0 0 0.03 +0.04 0 0 0.03 +0.04 0BS4A 111:1993 BSI 12-1999 List of references (seeclause 2) Normative references BSI standards publications BRITISH STANDARDS
41、INSTITUTION, London BS 3A 100:1991, Specification for general requirements for bolts and free running nuts of tensile strength not exceeding1249MPa 1) . BS 3S 95:1967, Specification for 1 1 / 2per cent nickel-chromium-molybdenum steel 90/110 kgf/mm 2(57/70 tonf/in 2 ): limiting ruling section150mm (
42、6in). BS 3S 102:1969, Specification for carbon-molybdenum steel (bar for the manufacture of forged bolts only). BS 3S 105:1969, Specification for carbon steel (bar for the manufacture of forged bolts only). BS 2S 114:1964, Specification for aircraft material. Manganese-molybdenum steel (55/65 tonf/s
43、q in: limiting ruling section 2 1 / 2inches). BS 2S 116:1964, Specification for aircraft material “40” carbon steel bright bars for machining (55-65 tonf/sq in: limiting ruling section 3 / 4inch) (primarily intended for the manufacture of machined bolts). BS 2S 117:1964, Specification for aircraft m
44、aterial. 1 per cent chromium steel (55/65 tonf/sq in: limiting ruling section 1 1 / 8inch). BS 2S 147:1976, Specification for0.5% nickel-chromium-molybdenum steel bars for the manufacture of forged bolts and forged nuts. BS S 148:1969, Specification for low nickel-chromium steel (bar for the manufac
45、ture of forged bolts only). BS 2S 149:1976, Specification for1.75% nickel-chromium-molybdenum steel bars for the manufacture of forged bolts and forged nuts. BS S 154:1976, Specification. 2 1 2 % nickel-chromium-molybdenum steel billets, bars, forgings and parts(8801080MPa: limiting ruling section15
46、0mm). BS S 158:1977, Specification for1% chromium-molybdenum steel bars for the manufacture of forged bolts and forged nuts. Other references 1 DEF STAN03-19 Electro-Deposition of Cadmium available from Ministry of Defence (Procurement Executive), Directorate of Standardization, Kentigern House,65 B
47、rown St, Glasgow G2 8EX. Informative references BSI standards publications BRITISH STANDARDS INSTITUTION, London BS 3A 108:1962, Specification for steel bolts (Unified hexagons and Unified threads) with close tolerance shanks for aircraft 2) . BS 2S 96:1964, Specification for 2 1 / 2per cent nickel-
48、chromium-molybdenum steel (55/65 tonf/sq in: limiting ruling section6in) 3) . 1) Edition current at time of publication (seeclauses 3 and8). 2) Referred to in the foreword only. 3) Withdrawn.BS 4A 111:1993 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent
49、 national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions BritishStandards are updated by amendment or revision. Users of BritishStandards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this BritishStandard would inform the Secretary of the
