1、BRITISH STANDARD BS 2558:1954 Incorporating Amendment Nos. 1, 2 and 3 Tubular box spannersBS2558:1954 This British Standard, having been approved by the MechanicalEngineering IndustryStandards Committeeand endorsed by theChairman of the EngineeringDivisional Council, was publishedunder the authority
2、ofthe General Councilon 31December1954 BSI 04-2000 The following BSI references relate to the work on this standard: Committee reference MEE/9/2 Draft for comment CN(MEE) 7582 ISBN 0 580 34580 7 Co-operating organizations The Mechanical Engineering Industry Standards Committee, under whose supervisi
3、on this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the following, wer
4、e directly represented on the committee entrusted with the preparation of this British Standard: Admiralty* High Commission of India Air Ministry Institute of Marine Engineers Associated Offices Technical Committee Institute of Petroleum Association of Consulting Engineers Institution of Civil Engin
5、eers (Incorporated) Institution of Gas Engineers British Chemical Plant Manufacturers Institution of Heating and Ventilating Association Engineers British Compressed Air Society Institution of Mechanical Engineers* British Electrical and Allied Manufacturers Institution of Mechanical Engineers Assoc
6、iation* (Automobile Division) British Electricity Authority and Area Boards Institution of Production Engineers* British Engineers Association Locomotive Manufacturers Association* British Internal Combustion Engine Machine Tool Trades Association Manufacturers Association Ministry of Fuel and Power
7、 British Iron and Steel Federation Ministry of Labour and National Service British Railways The British Transport (Factory Department) Commission* Ministry of Supply* Crown Agents for Oversea Governments and Ministry of Transport Administrations Ministry of Works D.S.I.R. Mechanical Engineering Nati
8、onal Physical Laboratory* Research Laboratory Radio Industry Council Engineering Equipment Users Association War Office Gas Council* Federation of British Hand Tool Society of British Aircraft Constructors Manufacturers Telephone Manufacturers Technical General Post Office Development Committee Leic
9、ester Technical College Spanner Manufacturers National Association of Drop Forgers and Individual large users Stampers Amendments issued since publication Amd. No. Date of issue Comments 2150 March 1955 2696 January 1957 3590 December 1959 Indicated by a sideline in the marginBS2558:1954 BSI 04-2000
10、 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 Material for spanners 1 3 Material for tommy bars 1 4 Heat treatment and hardness for Grade A spanners 1 5 Tommy bar holes 1 6 Designation and marking 1 7 Finish 2 8 Performance test 2 a) Grade A and Grade B spann
11、ers b) Tommy bars 9 General dimensions 3 10 Tolerances 3 a) Tube wall b) Formed ends of spanners 11 Tommy bars 3 Figure 1 Tubular box spanner and tommy bar 5 Table 1 Maximum dimensions across flats of hexagons 4 Table 2 Dimensions for tubular box spanners for Unified hexagon sizes (BS1768 and BS2708
12、, Normal Series and BS1769, Heavy Series) 6 Table 2A Dimensions of tubular box spanners for Unified hexagon sizes (Normal Series) to BS1768 and BS2708 8 Table 3 Dimensions of tubular box spanners for Unified machine screw and machine screw nut hexagons (BS1981) 10 Table 4 Dimensions of tubular box s
13、panners for BS hexagons (BS916 and BS1083) and Whitworth large hexagons 12 Table 5 Dimensions of tubular box spanners for B.A.hexagons (BS57) 14 Table 6 Dimensions of tubular box spanners for metric hexagons 16BS2558:1954 ii BSI 04-2000 Foreword This standard makes reference to the following British
14、 Standards: BS 57, B.A.screws, bolts, nuts and plain washers. BS 860, Table of approximate comparison of hardness scales. BS 916, Black bolts, screws and nuts. BS 970, Wrought steels. BS 1083, Precision hexagon bolts, screws, nuts and plain washers. BS 1750, Bolting for the petroleum industry. BS 17
15、68, Unified precision hexagon bolts, screws, nuts (UNC and UNF threads) and plain washers normal series. BS 1769, Unified black hexagon bolts, screws and nuts and plain washers heavy series. BS 1981, Unified machine screws and machine screw nuts. BS 2708, Unified black square and hexagon bolts, scre
16、ws and nuts (UNC and UNF threads). Normal series. BS A102, Steel bolts (Unified hexagon and UNF threads) for aircraft. This British Standard has been prepared under the authority of the Mechanical Engineering Industry Standards Committee and forms one of a series relating to the main types and range
17、s of spanners. The specification relates entirely to box spanners of the tubular type as it is intended that a separate standard will be prepared for the forged type and for socket spanners. The composition and layout are directly related to the latest revision of BS192, the title of which has been
18、amended to “Open-ended spanners (not including B.A.sizes)”, except that while the spanners in BS192 are dealt with throughout on a single-ended basis, those in this specification are treated entirely as double-ended. Spanner dimensions are included for all the main hexagon ranges as in BS192 but it
19、should be noted that the dimensions across flats are given in two grades, A and B. The reason for this is that provision has been made for alternative types of steels from which the spanners may be manufactured, GradeA referring to the better quality steel which is heat treated, and GradeB to steel
20、with a much lower carbon content, which is not heat treated. The apparent anomaly in the tables, where GradeB spanners are given first and are to closer limits of tolerance, is explained by the fact that dimensional allowance has to be made for distortion resulting from the heat treatment of GradeA
21、spanners. The marking of the spanners has been complicated by the necessity to indicate those which are intended for use on the various Unified hexagons. The problem has been solved in a manner identical with that put forward in BS192, and the system requires the use of simple figures derived from t
22、he decimal equivalent of the size across flats. Investigations have shown that newcomers to the engineering industry experience no more and probably less, difficulty in mastering this method of nomenclature than the old fractional markings, which tended to be confusing because of their obvious diffe
23、rence from the size of the actual jaw opening in some cases, e.g.,the large Whitworth range. There is a popular custom, whereby a series of tubular spanners is nested for convenience of storage or carrying but, after reviewing the matter, it was not considered advisable to include any provision for
24、this practice in the specification. A table of spanners for metric hexagons is included. This has had to be prepared on a more or less arbitrary basis for the same reason that applied in BS192, i.e.because of the lack of co-ordinated specifications for metric bolts and nuts. As the use of the large
25、Whitworth hexagons is still widespread, references to the relevant spanners have been incorporated in the table for the B.S. series.BS2558:1954 BSI 04-2000 iii A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for th
26、eir 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 to iv, pages1 to 18 and an inside back cover. This standard has been updated (see copyright da
27、te) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.iv blankBS2558:1954 BSI 04-2000 1 1 Scope This British Standard relates to tubular box spanners suitable for the following hexagon standards or ranges: BS 1768, Unified precision hex
28、agon bolts, screws, nuts (UNC and UNF threads) and plain washers. Normal series. BS 1769, Unified black hexagon bolts, screws, nuts (UNC and UNF) and plain washers. Heavy series. BS 1981, Unified machine screws and machine screw nuts. BS 1083, Precision hexagon bolts, screws, nuts (BSW and BSF threa
29、ds) and plain washers. BS 916, Black bolts and nuts. Hexagon and square, BSW and BSF. BS 57, B.A. screws, bolts, nuts and plain washers. Whitworth large hexagons (originally specified in BS190, now obsolete). Metric hexagons. NOTEThe spanners specified are also suitable for all the bolt sizes given
30、in BSA102 1)and for all the bolt head and most of the nut sizes used by the petroleum industry and specified in BS1750 2) . The specification includes clauses for material, heat treatment, marking, tests and dimensional details together with requirements for the tommy bars by which the spanners are
31、operated. 2 Material for spanners Tubular box spanners complying with the provisions of this British Standard shall be manufactured from seamless steel tubing of any of the types given below: a) Grade A spanners. i) Steel having a carbon content of not less than0.30per cent and not more than0.40perc
32、ent. NOTESteel to specification En.8B or En.8E of BS970 3) , is considered a suitable material. ii) Alloy steel complying with any appropriate specification inBS970 3) . Grade A spanners shall be heat treated as specified inClause4. b) Grade B spanners. Steel having a maximum carbon content of0.20pe
33、r cent. GradeB spanners shall not be heat treated. 3 Material for tommy bars Tommy bars complying with the provisions of this British Standard shall be manufactured from steel having a carbon content of not less than0.30and not more than0.40per cent with a yield point of not less than40tons per sq.i
34、n. 4 Heat treatment and hardness for Grade A spanners Grade A spanners shall be subjected to the heat treatment and tempering necessary to produce the following hardness figures, in all cases using a load of30kg.: a) When manufactured from the steel specified in 2 a)i): hardness within the range200/
35、235 on the diamond pyramid hardness scale or the equivalent on other scales 4) . b) When manufactured from the steel specified in 2 a)ii): hardness within the range235/300 on the diamond pyramid hardness scale or the equivalent on other scales. 5 Tommy bar holes a) Position. Each spanner shall be pr
36、ovided with two sets of holes which are located as near as practicable to the change of section at each end of the spanner and which shall be at90degrees to each other. SeeFigure 1. b) Size. The diameter of the holes shall be suchaswill permit entry of a tommy bar of theappropriate size given inTabl
37、e 2, Table 3,Table 4,Table 5 andTable 6, when the bar is on the maximum limit of tolerance for its diameter but will not permit entry of the next larger diameter of tommy bar. 6 Designation and marking Spanners in accordance with this British Standard shall be designated and marked according to the
38、requirements specified below which vary according to the range of hexagon sizes for which they are designed. The marking shall be plain and indelible and shall be adjacent to each formed end. 1) BSA102, “Steel bolts (Unified hexagons and UNF threads) for aircraft”. 2) BS1750, “Bolting for the petrol
39、eum industry”. 3) BS970, “Wrought steels”. 4) BS860, “Approximate comparison of hardness scales”.BS2558:1954 2 BSI 04-2000 The spanners are considered as being double-ended in all cases, each end being intended for a size in the same hexagon range as the opposite end and being marked appropriately i
40、n accordance with the following clauses. It is recommended that hexagons from two different ranges should not be associated on any one spanner. a) Spanners for Unified hexagons in BS 1768, BS 1769 and BS 1981. The marking (which shall also be the designation or nominal size) shall be a number derive
41、d from the decimal equivalent of the nominal fractional size across flats of the hexagon, followed by the sign A/F. This number shall be rounded off to two decimal places and the decimal point shall be omitted. This requirement shall not debar any manufacturer from including, at his option, any addi
42、tional mark associated with the size. The following are examples of this type of marking: 34 A/F represents a spanner for a No.8 pressed nut. 94 A/F represents a spanner for a 5 / 8in.diameter Normal series bolt and nut. 162 A/F represents a spanner for a1in.diameter Heavy series bolt and nut. A man
43、ufacturer could add the marks 11 / 32A/F, 15 / 16A/F and 1 5 / 8A/F respectively to the above if he so desired. b) Spanners for B.S. hexagons in BS 1083 and BS 916 and for Whitworth large hexagons. Two fractions shall be marked on each end of these spanners. The first shall represent the nominal dia
44、meter of a bolt, the head of which corresponds to a hexagon size in BS1083 or BS916. This fraction shall be followed by the sign BS. The second fraction shall represent the nominal diameter of a bolt, the head of which corresponds to a hexagon, in the Whitworth large hexagon range. This shall be fol
45、lowed by the sign W. The following is an example of this marking: The designation or nominal size shall be either one or both of the fractions followed by “BS” or “Whitworth,” as applicable. c) Spanners for B.A.hexagons. The marking (which shall also be the designation or nominal size) shall be the
46、appropriate number followed by the signBA. The following are examples of this marking: d) Spanners for metric hexagons. The marking shall be the nominal internal size across the flats of the hexagon expressed in millimetres, followed by the signmm. This is also the designation. The following is an e
47、xample of this marking: 7 Finish The formed ends shall be co-axial and the end faces shall be at90 degrees to the axis of the tube. The formed ends and the external surfaces shall be free from burrs and cracks. The surface finish of Grade A spanners shall be blued, oil-black, or sandblasted and oile
48、d. The surface finish of GradeB spanners shall be by blueing or mottling. The surface finish of both Grades A and B may be varied by agreement between the purchaser and the manufacturer. 8 Performance test Every spanner and tommy bar shall be capable of passing the appropriate test given below: a) G
49、rade A and Grade B spanners. i) Each end of the spanner to be tested shall be placed in turn upon the head of a rigidly held bolt, the head dimensions of which comply with the provisions of BS1083, BS1768, BS1769, BS1981, BS916, BS57, Whitworth large hexagons or metric hexagons, whichever is appropriate to the size of the spanner being tested. For testing Grade A spanners, the test bolt shall be manufactured from high tensile steel having a tensile strength of55/65 tons per sqin. NOTEOne of the En.16 specifications from BS970 5) , is recommended as s
