1、BRITISH STANDARD BS2090:1954 Specification for Hook spanners peg spanners coupling wrenches and the related slots, holes and hornsBS2090:1954 This British Standard, having been approved by the MechanicalEngineering IndustryStandards Committeeand endorsed by theChairman of the EngineeringDivisional C
2、ouncil,was published undertheauthority of the General Council on 26 February1954 BSI 10-1999 ISBN 0 580 35610 8 Co-operating organizations The Mechanical Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the followi
3、ng Government departments and scientific and industrial organizations: The Government departments and 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 standard: Admiralty* High Comm
4、ission of India Air Ministry Institute of Marine Engineers Associated Offices Technical Committee Institute of Petroleum Association of Consulting Engineers Institution of Civil Engineers (Incorporated) Institution of Gas Engineers British Chemical Plant Manufacturers Institution of Heating and Vent
5、ilating Association Engineers British Compressed Air Society Institution of Mechanical Engineers* British Electrical and Allied Manufacturers Institution of Mechanical Engineers Association* (Automobile Division) British Electricity Authority and Area Boards Institution of Production Engineers* Brit
6、ish Engineers Association* Locomotive Manufacturers Association British Internal Combustion Engine Machine Tool Trades Association Manufacturers Association Ministry of Fuel and Power British Iron and Steel Federation Ministry of Labour and National Service British Railways, The British Transport (F
7、actory Department) Commission* Ministry of Supply* Crown Agents for the Colonies Ministry of Transport and Civil Aviation D.S.I.R.Mechanical Engineering Research Ministry of Works Laboratory Radio Industry Council Engineering Equipment Users Association War Office Gas Council* Federation of British
8、Hand Tool National Physical Laboratory Manufacturers Society of British Aircraft Constructors General Post Office Telephone Manufacturers Technical Leicester Technical College Development Committee National Association of Drop Forgers and Spanner manufacturers Stampers Amendments issued since public
9、ation Amd. No. Date CommentsBS2090:1954 BSI 10-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 Part 1. Hook spanners and slots Section 1. Spanners 2 Material 1 3 Finish 1 4 Angle of application 1 5 Range of sizes and dimensions 1 6 Clearance 1 7 Marking 1 Sec
10、tion 2. Slots 8 Definitions 9 9 Number of slots 9 10 Limits of tolerance on radial position of slots 9 11 Limits of tolerance on dimensions 9 12 Dimensions of slots 9 Part 2. Peg spanners and peg holes 13 Type 9 14 Material 9 15 Finish 14 16 Range of sizes 14 17 Dimensions 14 18 Limits of tolerance
11、14 19 Marking 14 Part 3. Coupling Wrenches 20 Type 14 21 Material 14 22 Finish 14 23 Dimensions 14 Figure 1 Hook spanner proportions 2 Figure 2 Hook spanner clearances 6 Figure 3 Types of spanner slot in circular nuts 8 Figure 4 Proportions and limits of tolerance for peg spanners and holes 10 Figur
12、e 5 Wrenches for couplings having rectangular horns 15 Figure 6 Wrenches for couplings having round horns 17 Table 1 Dimensions of hook spanners 3 Table 2 Clearances 7 Table 3 Dimensions of spanner slots in circular nuts 9 Table 4 Dimensions of peg spanners and peg holes 11 Table 5 Wrenches for coup
13、lings having rectangular horns 16 Table 6 Wrenches for couplings having round horns 18BS2090:1954 ii BSI 10-1999 Foreword This standard makes reference to the following British Standards: BS15, Structural steel. BS970, Wrought steels. BS1638, Report on the selection of ranges of types and sizes(pref
14、erred numbers). BS2045, Preferred numbers. BS1782, Couplings for suction and delivery hose, other than fire hose couplings. BS. 1) , Couplings for petrol, oil and lubricants. This British Standard has been prepared under the authority of the Mechanical Engineering Industry Standards Committee and fo
15、rms one of a series for various types of spanner. The specification is divided into three parts, the first of which is concerned with hook spanners, for which a series of steps for the diameters of nuts has been used as a basis. The series is in accordance with the system of Preferred Numbers given
16、in BS1638 2)and BS2045 3) , first preference being the20series, second preference the40series. Adjacent steps in each are considered as a group and accorded similar dimensions, e.g.: the1.00in. and 1.12in. nuts in the20series are grouped with the1.06in. and1.18in. nuts in the40series and can all be
17、produced from the same size blank; the4.00in.20 series nut is grouped with the4.25in.40 series nut and so on. The basic design of the operating faces is that of two intersecting radii which are directly related to the diameters of the20 series and40 series nuts for which the spanner is intended. To
18、increase the functional range of the spanner series and to ensure that the needs of intermediate nut sizes are met, the operating arc is also undercut, thus not only permitting proper contact at the heel of the spanner, but ensuring that the spanner can, in most cases, be used with adequate safety a
19、nd efficiency on nuts intermediate in diameter between the20 and40 series, although the fit in these cases is not perfect. This undercut has the further advantage that it can be blanked out and therefore reduces the amount of machining necessary during manufacture. The dimensions and tolerances of t
20、he slots in the circular nuts are included in the specification in order to ensure that the spanners can function efficiently. For the same reason, clearances for the head and shank are specified, because, unless adequate clearance allowance is made, difficulties in engaging and disengaging the span
21、ners in confined spaces will be encountered. Part2 relates to peg spanners and, as for hook spanners, simplification based on the20series of Preferred Numbers has been adopted. Additionally, the series has been placed in four groups in each of which only a single peg size is necessary. The dimension
22、al details of the peg holes are given in the specification for the same reasons that those for the slots in the circular nuts were given, i.e.to ensure the safe and efficient functioning of the peg spanners. The lengths of both hook and peg spanners are related to the nut diameter and, for the same
23、nominal size, are similar. Only the fixed pattern is given in this specification; the adjustable forms are not included, despite their popularity because of the infinite varieties of design which are possible, many of which are intended for special applications. NOTEWhen it is intended to employ adj
24、ustable types of hook or peg spanners, it is recommended that the slots and holes in the relevant nuts should be designed to comply with the details given in this British Standard. 1) In course of preparation. 2) BS1638, “Report on the selection of ranges of types and sizes(Preferred Numbers)”. 3) B
25、S2045, “Preferred Numbers”.BS2090:1954 BSI 10-1999 iii Part3 relates to coupling wrenches, all the details of which are taken from the specifications for the various hose couplings 4) . These wrenches are for use on hoses intended for the transfer of various liquids, the working pressure of which do
26、es not exceed100lb/sq, in., but Part3 does not include requirements for coupling wrenches for fire hoses. This part of the specification has been included at the express wish of those responsible for the couplings standards, in which detailed requirements of the horns are set down. A British Standar
27、d 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 immunity from legal obligations. Summary of pages This document comprises a front cover, an
28、 inside front cover, pages i to iv, pages1to18 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. 4) BS1782, “Couplings for suction and delivery hose other than fire
29、hose couplings”. BS, “Hose couplings for petrol, oil and lubricants”(in course of preparation).iv blankBS2090:1954 BSI 10-1999 1 1 Scope Part1. Hook spanners. Section 1 relates to the dimensional and clearance details of hook spanners. Clauses on material and hardness are included. Section 2 relates
30、 to the slots on circular nuts with which the spanners are to operate. Part2. Peg spanners. Relates to the dimensions and materials for peg spanners and to the details of the peg holes in circular and other nuts with which this type of spanner is used. Part3. Coupling wrenches. Relates to the dimens
31、ions of coupling wrenches, together with the horns on which they function. Part1. Hook spanners and slots Section 1. Spanners 2 Material Hook spanners shall be manufactured from steel complying with Specification En8 of BS970 5) , heat treated to produce the properties of Category R, giving a tensil
32、e strength of45tons. Alternatively a steel with equivalent mechanical properties may be used by arrangement between purchaser and manufacturer. 3 Finish All sharp corners shall be removed from the hook spanners and the tools shall be free from cracks and defects. The spanners shall be subjected to a
33、n approved anti-corrosive treatment, such as plating, the details of which shall be by agreement between the purchaser and manufacturer. 4 Angle of application The nominal working angle between the tongue and the opposing point of contact shall be150degrees.(SeeFigure 1.) 5 Range of sizes and dimens
34、ions a) Range of sizes. The spanners shall be suitable for a range of circular nuts with nominal diameters from1inch to10.6inches. The first preference for the increments in diameter shall be the20series of Preferred Numbers, and the second preference the40 series of Preferred Numbers 6) . Each span
35、ner is designed to fit two(nominal) sizes of circular nut although the operating face is so formed that a spanner will also function on intermediate sizes of nut. b) Blanks. A range of sizes of blanks from which the hook spanners may be cut is included in Table 1. The blanks shall be serially number
36、ed according to the spanners which may be cut from them, numbers1,2,3 and4 being suitable for four nominal nut sizes and numbers5 to17 inclusive being suitable for two nominal nut sizes. NOTEAs mentioned in the Foreword, because of the undercut provided on the operating face, a spanner may also be u
37、sed with safety on sizes intermediate to those given in Table 1. c) Dimensions. The dimensions of hook spanners shall be as given in Table 1. The form radius, A, Figure 1, for the smaller size nut shall be struck from the theoretical centre of the nut. The form radius, B, Figure 1, for the larger si
38、ze nut shall be struck from a position offset from the theoretical centre of the nut by dimension D in Table 1. 6 Clearance The main clearance dimensions necessary to allow the outer edge of the spanner to move freely when changed from one slot to another by lifting the tongue in confined spaces, an
39、d those necessary to provide sufficient room for a hand-grip under the same circumstances, are given in Table 2. 7 Marking Every hook spanner shall be plainly and indelibly marked on the handle with the two actual nominal sizes for which it is suitable. The nominal sizes of the spanner shall be the
40、nominal maximum and minimum diameters of nuts in the appropriate group. 5) BS970, “Wrought steels”. 6) BS1638, “Report on the selection of ranges of types and sizes(Preferred Numbers)”. BS2045, “Preferred Numbers”.BS 2090:1954 2 BSI 10-1999 Figure 1 Hook spanner proportionsBS 2090:1954 BSI 10-1999 3
41、 Table 1 Dimensions of hook spanners (Alphabetical references are to Figure 1) All dimensions are in inches 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Nominal diameter of nuts Radii for fitting nuts Centre offset for radius of larger nut Head blending radius Position of centre for head ra
42、dius Radius of undercut Radius in corners of undercut Angles in degrees Width of handle Length from end to centre of nut Thickness Tongue Diameter of hanging hole Blank Width Depth +0.000 0.015 20 Series 40 Series A B D E F G H J K L M N P S T U No. Length Width 1.00 0.50 0.055 0.80 0.02 0.03 0.59 0
43、.05 55 75 0.40 4.25 0.187 0.15 0.125 3 / 16 1 5.20 1.10 1.06 0.53 1.12 0.56 0.055 1.18 0.59 1.25 0.625 0.065 1.00 0.10 0.03 0.73 0.10 0.50 5.00 0.187 0.20 0.125 1 / 4 2 6.00 1.30 1.32 0.66 1.40 0.70 0.090 1.50 0.75 1.60 0.80 0.090 1.25 0.125 0.05 0.93 0.60 6.00 0.25 0.20 0.125 5 / 16 3 7.20 1.60 1.7
44、0 0.85 1.80 0.90 0.090 1.90 0.95 2.00 1.00 0.110 1.55 0.15 0.05 1.15 0.15 0.70 7.00 0.25 0.20 0.125 5 / 16 4 8.40 1.85 2.12 1.06 2.24 1.12 0.110 2.36 1.18BS 2090:1954 4 BSI 10-1999 Figure 1 Hook spanner proportions (continued)BS 2090:1954 BSI 10-1999 5Table 1 Dimensions of hook spanners (Alphabetica
45、l references are to Figure 1) All dimensions are in inches 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Nominal diameter of nuts Radii for fitting nuts Centre offset for radius of larger nut Head blending radius Position of centre for head radius Radius of undercut Radius in corners of unde
46、rcut Angles in degrees Width of handle Length from end to centre of nut Thickness Tongue Diameter of hanging hole Blank Width Depth +0.000 0.015 20 Series 40 Series A B D E F G H J K L M N P S T U No. Length Width 2.5 1.25 0.14 1.65 0.20 0.15 1.30 0.05 50 85 0.75 8.00 0.25 0.20 0.15 5 / 16 5 9.50 2.
47、00 2.65 1.325 2.8 1.40 0.18 1.85 0.25 0.15 1.45 0.80 9.00 0.25 0.20 0.15 3 / 8 6 10.70 2.20 3.00 1.50 3.15 1.575 0.185 2.10 0.30 0.15 1.625 90 0.90 10.00 0.25 0.20 0.15 7 12.85 2.50 3.35 1.675 3.55 1.775 0.185 2.30 0.35 0.15 1.85 1.00 11.00 0.25 0.20 0.15 8 13.00 2.75 3.75 1.875 4.00 2.00 0.23 2.60
48、0.40 0.20 2.10 0.10 1.10 12.00 0.312 0.30 0.20 7 / 16 9 14.3 3.00 4.25 2.125 4.50 2.25 0.23 2.95 0.45 0.20 2.35 45 95 1.10 13.00 0.0312 0.30 0.20 1 / 2 10 15.50 3.40 4.75 2.375 5.00 2.50 0.28 3.30 0.50 0.25 2.60 1.20 14.00 0.312 0.30 0.20 11 16.75 3.75 5.30 2.65 5.60 2.80 0.37 3.70 0.55 0.25 2.90 1.
49、30 16.00 0.312 0.30 0.20 5 / 8 12 19.15 4.20 6.00 3.00 6.30 3.15 0.37 4.05 0.60 0.30 3.25 1.30 18.00 0.375 0.40 0.20 13 21.50 4.60 6.70 3.35 7.10 3.55 0.37 4.60 0.70 0.30 3.65 1.40 20.00 0.375 0.40 0.20 14 23.75 5.20 7.50 3.75 8.00 4.00 0.46 5.25 0.80 0.30 4.15 0.15 97 1.50 22.00 0.375 0.40 0.20 3 / 4 15 26.25 5.80 8.50 4.25 9.00 4.50 0.46 5.90 0.90 0.30 4.65 1.60 25.00 0.375 0.40 0.20 16 29.75 6.50 9.50 4.75 10.00 5.00 0.56 6.45 1.05 0.40 5.15 1.75 28.00 0.375 0.40 0.20 17 33.25 7.20 10.60 5.30BS 2090:1954 6 BSI 10-1999 Figure
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