1、BRITISH STANDARD BS 1842:1952 Specification for Double-ended open-jawed spanners for B.A. hexagon sizesBS1842:1952 This British Standard, having been approved by the MechanicalIndustry Standards Committee and endorsed by the Chairman of the Engineering Divisional Council, was publishedunder the auth
2、ority ofthe General Council on 10March1952 BSI 01-2000 ISBN 0 580 34099 6 Co-operating organizations The Mechanical Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientif
3、ic and industrial organizations: The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: Admiralty* Institute of
4、Petroleum Air Ministry Institution of Civil Engineers Associated Offices Technical Committee Institution of Gas Engineers Association of Consulting Engineers Institution of Heating and Ventilating (Incorporated) Engineers British Chemical Plant Manufacturers Institution of Mechanical Engineers* Asso
5、ciation Institution of Mechanical Engineers British Compressed Air Society (Automobile Division) British Electrical and Allied Manufacturers Institution of Production Engineers* Association* Locomotive Manufacturers Association* British Engineers Association Machine Tool Trades Association British I
6、nternal Combustion Engine Ministry of Fuel and Power Manufacturers Association Ministry of Labour and National Service British Iron and Steel Federation (Factory Department) British Railways, The Railway Executive* Ministry of Supply* Crown Agents for the Colonies Ministry of Transport D.S.I.R. Mech
7、anical Engineering Ministry of Works Research Organization Office of the High Commissioner for India Engineering Equipment Users Association War Office Institute of Marine Engineers Federation of British Hand Tool National Association of Drop Forgers and Manufacturers Stampers Gas Council Society of
8、 British Aircraft Constructors General Post Office Spanner Manufacturers Imperial Chemical Industries Telephone Manufacturers Technical Leicester College of Technology and Development Committee Commerce Amendments issued since publication Amd. No. Date CommentsBS1842:1952 BSI 01-2000 i Contents Page
9、 Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 Material and hardness 1 3 Angle of head 1 4 Range 1 5 Tolerances on jaw openings 1 6 Manufacture and finish 1 7 Dimensions 2 8 Marking 2 Appendix Maximum dimensions across flats of B.A. hexagons (extracted from BS57) 7 Table 1 Di
10、mensions for spear-head type 4 Table 2 Dimensions for round head type 6 Table 3 7BS1842:1952 ii BSI 01-2000 Foreword This standard makes reference to the following British Standards: BS 57, B.A. bolts, screws, nuts and washers. BS 860, Table of approximate comparison of hardness scales. BS 970, Wrou
11、ght steels. This British Standard has been prepared under the authority of the Mechanical Engineering Industry Standards Committee and forms one of a series covering the main types and ranges of spanners. As certain other standards in the series, relating to tubular, socket and ring spanners, will d
12、eal with all hexagon ranges, including the B.A. this standard provides for the open-jawed type only in the B.A. range. Performance tests have been omitted as being unnecessary for this type of spanner. It is felt that the quality of these tools is adequately safe-guarded by the provisions of the cla
13、uses dealing with material, heat treatment, hardness and manufacture. Open-jawed B.A. spanners fall naturally into two categories which, for convenience of nomenclature, have been designated the “spear-head” type and the “round-head” type. It should be understood that these terms refer to their gene
14、ral appearance. The decision to include both odd and even number sizes in this British Standard was made after very careful consideration, but it should be noted that provision is not made for their incorporation together on any spanner. A British Standard does not purport to include all the necessa
15、ry 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, pages1 t
16、o 7 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.BS1842:1952 BSI 01-2000 1 1 Scope This British Standard relates to spanners having open-ended jaws suitable for
17、hexagons in the B.A. (British Association) range as given in BS57, “B.A. bolts, screws, nuts and washers.” Details of material and hardness are included together with dimensions and tolerances on the jaw openings. There shall be two categories, designated spear-head and round-head, which are illustr
18、ated at the head ofTable 1 andTable 2 respectively. Each spanner shall be double-ended and the range of jaw openings shall be that given in Clause4. 2 Material and hardness The material from which spanners are manufactured in accordance with this British Standard, shall conform to the analysis of on
19、e of the following specifications given in BS970, “Wrought steels”: a) Spear-head type En.18, En.47 or En.50. b) Round-head type En.42A. The spanners shall be suitably heat-treated to produce an ultimate tensile strength of74 to94 tons/sq.in. and hardness corresponding to a diamond pyramid number of
20、350 to450. NOTEFor the equivalent figure in other hardness scales, reference should be made to BS860. 1) 3 Angle of head a) Spear-head type. The angle of head shall conform to either of the following: i) both heads inclined at15 to the axis of the spanner; ii) one head in line with the axis of the s
21、panner and the other inclined at45 . b) Round-head type. All heads shall be inclined at an angle of15 to the axis of the spanner. 4 Range a) The B.A. numbers covered by spanners inthisBritish Standard shall be0,1,2,3,4,5,6,7,8,9,10, and11. b) The spanners shall be manufactured with both ends having
22、either even or odd numbers as follows: c) Spear-head spanners in accordance with Clause3 a) ii) above, shall be available alternatively with either of the B.A. sizes straight or inclined at45 , as shown below: 5 Tolerances on jaw openings a) Spear-head type. For all sizes the minimum jaw opening sha
23、ll be equal to the maximum dimension across flats of the hexagon plus0.002in. There shall be an additional tolerance for manufacturing purposes of+0.003in. (seeTable 1). b) Round-head type. i) For sizes from11B.A. to5B.A. inclusive, the minimum jaw opening shall be equal to the maximum dimension acr
24、oss flats of the hexagon plus0.003in. There shall be an additional tolerance, for manufacturing purposes, of +0.003in. ii) For sizes from4B.A. to0B.A. inclusive, the minimum jaw opening shall be equal to the maximum dimension across flats of the hexagon plus0.003in. There shall be an additional tole
25、rance, for manufacturing purposes, of +0.005in. (seeTable 2). c) All jaw openings shall be parallel. 6 Manufacture and finish a) Spear-head type. The finish shall be chrome or nickel plated with polished head unless otherwise specified and agreed between purchaser and manufacturer. b) Round-head typ
26、e. The finish shall be a commercial “temper blue” or black unless otherwise specified and agreed between purchaser and manufacturer. c) Every spanner supplied in accordance with the provisions of this British Standard shall be free from burrs, surface cracks or other defects. 1) BS 860, “Table of ap
27、proximate comparison of hardness scales”. 0 2 1 3 4 6 5 7 8 10 9 11 Jaw straight Jaw inclined at 45 Jaw straight Jaw inclined at 45 0 2 1 3 2 0 3 1 4 6 5 7 6 4 7 5 8 10 9 11 10 8 11 9BS1842:1952 2 BSI 01-2000 7 Dimensions Spanners shall conform to the dimensions given inTable 1 for the “spear-head”
28、type, andTable 2 for the “round-head” type. The relevant form is illustrated at the head of each table. NOTEThe tables do not include all the dimensions necessary for manufacture. 8 Marking Each spanner complying with the provisions of this British Standard shall be indelibly marked with the number
29、appropriate to its sizes, followed by the letters B.A. This marking shall be made at the positions indicated on the sketches aboveTable 1 andTable 2. The spanners shall also have such additional markings as may be agreed between purchaser and manufacturer.BS 1842:1952 BSI 01-2000 3 NOTEDimensions fo
30、r similar parts of both these types are identical; they vary only in the angle of inclination of the head.BS 1842:1952 4 BSI 01-2000 Table 1 Dimensions for spear-head type Alldimensionsaregivenininches 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Nominal size LARGE JAW SMALL JAW Length overall Th
31、ickness of head Width of shank Thickness of shank Nominal radius at bottom of jaws toendof dimension shown R Width of jaw C 1 Width of head Depth of jaw Width of jaw C 2 Width of head Depth of jaw Large jaw (todimension E1) Small jaw (todimension E2) B.A. No. B.A. No. Min. Max. Nominal D1 Nominal E1
32、 B.A. No. Min. Max. Nominal D2 Nominal E2 Nominal A Nominal B Nominal W Nominal T B.A. No. B.A. No. 0 2 0 0.415 0.418 0.855 0.498 2 0.326 0.329 0.673 0.391 3.5 0.125 0.343 0.100 0 0.249 2 0.195 1 3 1 0.367 0.370 0.758 0.452 3 0.284 0.287 0.586 0.340 3.0 0.104 0.312 0.080 1 0.226 3 0.170 4 6 4 0.250
33、0.253 0.516 0.300 6 0.195 0.198 0.402 0.234 2.5 0.093 0.208 0.070 4 0.150 6 0.117 5 7 5 0.222 0.225 0.458 0.266 7 0.174 0.177 0.355 0.209 2.25 0.093 0.187 0.070 5 0.113 7 0.104 8 10 8 0.154 0.157 0.318 0.185 10 0.119 0.122 0.246 0.143 2.0 0.080 0.125 0.062 8 0.093 10 0.072 9 11 9 0.133 0.136 0.275 0
34、.159 11 0.105 0.108 0.217 0.126 1.875 0.080 0.110 0.062 9 0.078 11 0.062BS 1842:1952 BSI 01-2000 5BS 1842:1952 6 BSI 01-2000 Table 2 Dimensions for round head type Alldimensionsaregivenininches 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Nominal size of spanner LARGE JAW SMALL JAW Overall length Thickness W
35、idth of centre of body Width behind head Width of jaw C 1 Width of head Depth of jaw Width of jaw C 2 Width of head Depth of jaw B.A. No. B.A. No. Min. Max. Nominal D 1 Nominal E 1 B.A. No. Min. Max. Nominal D2 Nominal E 2 Nominal A Nominal B Nominal F Nominal G 0 2 0 0.416 0.421 0.860 0.372 2 0.327
36、 0.332 0.764 0.304 3.343 0.095 0.420 0.313 1 3 1 0.368 0.373 0.860 0.329 3 0.285 0.290 0.764 0.266 3.343 0.095 0.420 0.313 4 6 4 0.251 0.256 0.570 0.242 6 0.196 0.199 0.452 0.192 2.687 0.080 0.328 0.188 5 7 5 0.223 0.226 0.570 0.215 7 0.175 0.178 0.452 0.174 2.687 0.080 0.328 0.188 8 10 8 0.155 0.15
37、8 0.421 0.157 10 0.120 0.123 0.343 0.126 2.000 0.068 0.250 0.156 9 11 9 0.134 0.137 0.421 0.138 11 0.106 0.109 0.343 0.115 2.000 0.068 0.250 0.156BS1842:1952 BSI 01-2000 7 Appendix Maximum dimensions acrossflats of B.A. hexagons (extractedfrom BS57) The dimensions across flats of the hexagons on whi
38、ch the jaw sizes of the spanners, given in this British Standard, have been calculated, are given in BS57, “B.A. bolts, screws, nuts and washers.” These hexagon dimensions are quoted inTable 3 below for the convenience of those wishing to ascertain the derivation of the jaw dimensions given inTable
39、1 andTable 2. Table 3 Alldimensionsaregivenininches B.A. No. Maximum dimension across flats B.A. No. Maximum dimension across flats 0 1 2 0.413 0.365 0.324 6 7 8 0.193 0.172 0.152 3 4 5 0.282 0.248 0.220 9 10 11 0.131 0.117 0.103BS 1842:1952 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandar
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