1、BRITISH STANDARD BS2061:1953 Incorporating Amendment Nos. 1 and 2 Specification Phosphor bronze spring washers for general engineering purposes UDC621.882.449:669.356BS 2061:1953 This British Standard, having been approved by the MechanicalEngineering IndustryStandards Committeeand endorsed bytheCha
2、irman ofthe EngineeringDivisional Council,was published undertheauthority of the GeneralCouncil on 8 December1953 BSI10-1999 ISBN 0 580 35629 9 Co-operating organizations The Mechanical Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of
3、representatives from the following Government departments and scientific and industrial organizations: Admiralty Institute of Marine Engineers Air Ministry Institute of Petroleum Associated Offices Technical Committee Institution of Civil Engineers Association of Consulting Engineers Institution of
4、Gas Engineers (Incorporated) Institution of Heating and Ventilating British Chemical Plant Manufacturers Engineers Association Institution of Mechanical Engineers British Compressed Air Society Institution of Mechanical Engineers British Electrical and Allied Manufacturers (Automobile Division) Asso
5、ciation* Institution of Production Engineers* British Electricity Authority and Area Boards Locomotive Manufacturers Association British Engineers Association* Machine Tool Trades Association British Internal Combustion Engine Ministry of Fuel and Power Manufacturers Association Ministry of Labour a
6、nd National Service British Iron and Steel Federation (Factory Department) British RailwaysThe British Transport Ministry of Supply* Commission Ministry of Transport Crown Agents for the Colonies Ministry of Works D.S.I.R. Mechanical Engineering Research National Physical Laboratory Laboratory Radio
7、 Industry Council Engineering Equipment Users Association War Office Gas Council High Commission of India The Government department and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted
8、 with the preparation of this British Standard: Coil Spring Federation Research Society of Motor Manufacturers and Traders Organization Spring washer manufacturers General Post Office Amendments issued since publication Amd. No. Date of issue Comments 1815 February 1954 1877 January 1976 Indicated b
9、y a sideline in the marginBS 2061:1953 BSI 10-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii Section 1. General 1 Scope 1 2 Designation 1 Section 2. Material 3 Analysis 1 4 Supply 1 5 Limits of tolerance on dimensions of wire 1 6 Freedom from defects 1 7 Hardness 1 8
10、Dead wire test 1 Section 3. Finished washers 9 Closing and test for permanent set 1 a) Single coil washers 1 b) Double coil washers 1 10 Ends 2 11 Tangling 2 12 Cranking 2 13 Finish 2 14 Shape 2 15 Dimensions 2 a) Nominal size 2 b) Clearance 2 Table 1 Tolerances on width and thickness of wire 1 Tabl
11、e 2 Sampling size for test for permanent set 2 Table 3 Clearances 2 Table 4 Single coil square section spring washers 3 Table 5 Single coil rectangular section spring washers 4 Table 6 Double coil spring washers 5BS 2061:1953 ii BSI 10-1999 Foreword This standard makes reference to the following Bri
12、tish Standards: BS384, Hard drawn phosphor bronze wire. BS427, Tables of diamond pyramid hardness numbers. BS860, Tables of approximate comparison of hardness scales. BS1432, Copper for electrical purposes. Sheet and strip. BS1802, Steel spring washers for general engineering and automobile purposes
13、. This British Standard has been prepared under the authority of the Mechanical Engineering Industry Standards Committee. The standard is complementary to BS1802, “Steel spring washers”, in that the phosphor bronze spring washers specified are also intended for general engineering purposes. The volu
14、me of usage of phosphor bronze spring washers is of course considerably less than that of the steel variety, but there is a field in which their resistance to corrosion, their non-magnetic and other distinctive properties give them great advantages over other types. As in the allied specification, t
15、he provisions of the standard are primarily dimensional. The quality of material to be used has been closely investigated in collaboration with the Coil Spring Federation Research Organization and the Cold Rolled Brass and Copper Association. The inclusion of the clause on the analysis of the materi
16、al is a direct result of the research and investigation carried out by the Coil Spring Federation Research Organization. In accordance with BSI policy concerning the introduction of metric standards, this imperial standard has been declared obsolescent. It will be made obsolete in due course. A Brit
17、ish 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 immunity from legal obligations. Summary of pages This document comprises a fron
18、t cover, an inside front cover, pagesi andii, pages1 to5 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.BS 2061:1953 BSI 10-1999 1 Section 1. General 1 Scope This
19、British Standard relates to phosphor bronze spring washers of helical construction intended for general engineering application, and of the following types: a) Single coil square section. b) Single coil rectangular section. c) Double coil. Washers supplied in accordance with this specification shall
20、 be for right hand threads unless otherwise specified by the purchaser. 2 Designation The washers shall be designated by the nominal diameters of the bolts with which they are used, as given in Column1 of Table 4, Table 5 and Table 6. Section 2. Material 3 Analysis Spring washers complying with the
21、provisions of this British Standard shall be manufactured from phosphor bronze having the following chemical analysis: NOTEThis analysis is identical with that given in BS384, “Hard drawn phosphor bronze wire”. 4 Supply The material intended for the manufacture of phosphor bronze spring washers shal
22、l normally be in the form of wire, supplied in coils, unless otherwise arranged between the purchaser and the supplier. 5 Limits of tolerance on dimensions of wire The wire for spring washers supplied in accordance with Clause4 above, shall be of square or rectangular section as required by the type
23、 to be manufactured. The limits of tolerance on the width or thickness of the wire shall be those given in Table 1 which are taken from Table4 of BS1432. 1)Table 1 Tolerances on width and thickness 6 Freedom from defects The wire supplied in accordance with Clause4 above shall be sound, clean and sm
24、ooth, free from kinks and from surface defects such as flaking, cracks, etc. 7 Hardness The minimum hardness value of the wire shall be200 on the diamond pyramid hardness scale, using a load of5 kg. 2)Alternatively, the equivalent hardness figure on other approved scales may be used. 3) 8 Dead wire
25、test The wire supplied in accordance with Clause4 shall be flat in the coil with no corkscrew set when the coil is released. Section 3. Finished washers 9 Closing and test for permanent set a) Single coil washers. Sample washers shall be selected from batches in accordance with Table 2. The samples
26、shall be completely closed; on release of the pressure the free height of each washer shall be not less than1.66 times its sectional thickness. This application and removal of pressure shall then be repeated twenty times in quick succession, after which the free height shall not have been further re
27、duced. Tin not less than4.5per cent not more than7.0per cent Phosphorus not less than0.02per cent not more than0.40per cent Lead not more than0.02per cent Total impurities (including lead) not more than0.20per cent Copper the remainder. 1) BS1432, “Copper for electrical purposes. Sheet and strip”. D
28、imensions are in inches. Width or thickness of wire Limits of tolerance plus and minus Over0.010 up to and including0.035 Over0.035 up to and including0.130 Over0.130 up to and including0.250 0.001 0.0015 0.002 2) BS427, “Tables of diamond pyramid hardness numbers”. 3) BS860, “Tables of approximate
29、comparison of hardness scales”.BS 2061:1953 2 BSI 10-1999 b) Double coil washers. Sample washers shall be selected from batches in accordance with Table 2. The samples shall be completely closed; on release of the pressure the free height of each washer shall be not less than three times its section
30、al thickness. This application and removal of pressure shall then be repeated twenty times in quick succession, after which the free height shall not have been further reduced. Table 2 Sampling size for test for permanent set 10 Ends The ends of washers shall not abut when the washer is in the close
31、d condition. 11 Tangling Single coil washers having a sectional thickness greater than16S.W.G.(0.064in.) shall be produced in such a manner that, when in the free condition, they shall not be liable to tangle or link together. 12 Cranking Double coil washers shall be cranked in such a manner that th
32、e washer lies flat when closed under compression. 13 Finish Phosphor bronze spring washers complying with this British Standard shall have a self-colour finish. 14 Shape During use the washers shall remain circular and their section shall be such as not to cause them to spread when set down by a nut
33、 under normal service conditions. NOTEThe dimensions given in Table 4 and Table 5 are based on the use of standard square and rectangular wire sections which, after coiling, produce washers of trapezoidal section, having the inner periphery thicker than the outer, but with the mean in accordance wit
34、h those dimensions given in the appropriate tables. 15 Dimensions a) Nominal size. The nominal size of the finished spring washer shall be that shown in Column1 of Table 4, Table 5 and Table 6. NOTEThe sizes in Table 5 for rectangular section washers and Table 6 for double coil washers do not decrea
35、se to sizes smaller than6B.A. Users are recommended, when requiring smaller nominal sizes, to use the square section washers given in Table 4. b) Clearance. The inside diameters of the finished washers shall be such that they exceed the diameter of the bolt by the amount shown in Table 3. Table 3 Cl
36、earances Size of batch Number in sample Up to and including200 201to1000 1001to5000 5001to10000 Over10000 5 10 20 30 40 1 2 3 Nominal diameter of bolt Clearance in the free condition Minimum Maximum in. in. 10B.A. up to and including7B.A. 6B.A. up to and including1B.A. 0B.A. and 1 / 4 in. up to and
37、including 1 / 2 in. 9 / 16 in. upwards 0.003 0.008 0.0156 ( 1 / 64) 0.0312 ( 1 / 32) 0.008 0.0156 ( 1 / 64) 0.0312 ( 1 / 32) 0.0625 ( 1 / 16) NOTEThe clearances given in Table 3 for bolts having nominal diameters up to and including0B.A. and 1 / 4 in. have been calculated on the fractional bolt size
38、. Where clearance and/or outside diameter are critical, it is recommended that allowance should be made for the variations between fractional and nearest B.A. size.BS 2061:1953 BSI 10-1999 3 Table 4 Type A. single coil square section spring washers Dimensions are in inches except where otherwise sta
39、ted. 1 2 3 4 Nominal size of washer (diameter of bolt) Nominal outside diameter D Nominal mean width and thickness W=T S.W.G. 10B.A. 9B.A. 8B.A. 7B.A. 0.139 0.147 0.159 0.170 0.032 0.032 0.032 0.032 21 21 21 21 1 / 8 6B.A. 5B.A. 0.206 0.222 0.221 0.040 0.040 0.040 19 19 19 5 / 32 4B.A. 3B.A. 0.254 0
40、.273 0.268 0.048 0.048 0.048 18 18 18 3 / 16 2B.A. 1B.A. 0.329 0.353 0.331 0.064 0.064 0.064 16 16 16 1 / 4 0B.A. 0.411 0.425 0.072 0.072 15 15 5 / 16 0.503 0.080 14 3 / 8 0.590 0.092 13 7 / 16 0.701 0.116 11 1 / 2 9 / 16 0.787 0.880 0.128 10 5 / 8 0.976 0.144 9 3 / 4 1.165 0.176 7BS 2061:1953 4 BSI
41、 10-1999 Table 5 Type B. single coil rectangular section spring washers Dimensions are in inches except where otherwise stated. 1 2 3 4 5 6 Nominal size of washer (diameter of bolt) Nominal outside diameter D Nominal width W Nominal thickness T S.W.G. S.W.G. 1 / 8 6B.A. 5B.A. 0.222 0.238 0.237 0.048
42、 0.048 0.048 18 18 18 0.032 0.032 0.032 21 21 21 5 / 32 4B.A. 0.286 0.300 0.064 0.064 16 16 0.036 0.036 20 20 3B.A. 0.337 0.080 14 0.036 20 3 / 16 2B.A. 1B.A. 0.385 0.409 0.387 0.092 0.092 0.092 13 13 13 0.048 0.048 0.048 18 18 18 1 / 4 0B.A. 0.451 0.465 0.092 0.092 13 13 0.064 0.064 16 16 5 / 16 0.
43、600 0.128 10 0.064 16 3 / 8 0.694 0.144 9 0.064 16 7 / 16 0.789 0.160 8 0.064 16 1 / 2 9 / 16 0.915 1.009 0.192 6 0.092 13 5 / 8 1.072 0.192 6 0.128 10 3 / 4 1.276 0.232 4 0.128 10BS 2061:1953 BSI 10-1999 5 Table 6 Type C. double coil spring washers Dimensions are in inches except where otherwise st
44、ated. 1 2 3 4 5 6 Nominal size of washer (diameter of bolt) Nominal outside diameter D Nominal width W Nominal thickness T S.W.G. S.W.G. 1 / 8 6B.A. 5B.A. 0.222 0.238 0.237 0.048 0.048 0.048 18 18 18 0.032 0.032 0.032 21 21 21 5 / 32 4B.A. 3B.A 0.286 0.305 0.300 0.064 0.064 0.064 16 16 16 0.032 0.03
45、2 0.032 21 21 21 3 / 16 2B.A. 0.361 0.363 0.080 0.080 14 14 0.032 0.032 21 21 1B.A. 0.385 0.080 14 0.036 20 1 / 4 0B.A. 0.451 0.465 0.092 0.092 13 13 0.048 0.048 18 18 5 / 16 0.576 0.116 11 0.048 18 3 / 8 0.694 0.144 9 0.048 18 7 / 16 0.757 0.144 9 0.064 16 1 / 2 0.851 0.160 8 0.064 16 9 / 16 1.009
46、0.192 6 0.064 16 5 / 8 1.072 0.192 6 0.080 14 3 / 4 1.236 0.212 5 0.080 14 NOTEThe free height of double coil washers before compression is normally approximately five times the thickness but, if required, washers with other free heights may be obtained by arrangement between purchaser and manufactu
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