1、BRITISH STANDARD BS1802:1951 Incorporating Amendment No. 1 Specification Steel spring washers for general engineering and automobile purposes UDC 621.882.4BS1802:1951 This British Standard, having been approved by the MechanicalEngineering Industry Standards Committee and endorsed by the Chairman of
2、 theEngineering Divisional Council, was published under theauthorityof the General Councilon 26th November1951 BSI 07-1999 ISBN 0 580 35085 1 Co-operating organizations The Mechanical Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of re
3、presentatives 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 G
4、as Engineers (Incorporated) Institution of Heating and Ventilating British Chemical Plant Engineers Manufacturers Association Institution of Mechanical Engineers British Compressed Air Society Institution of Mechanical Engineers British Electrical and Allied (Automobile Division) Manufacturers Assoc
5、iation* 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 British Iron and Steel Federation* Ministry of Labour and Nation
6、al Service British Railways, The Railways (Factory Department) Executive* Ministry of Supply* Crown Agents for the Colonies* Ministry of Transport Department of Scientific and Ministry of Works Industrial Research Office of the High Commissioner for India* Engineering Equipment Users War Office Asso
7、ciation* The Government departments and scientific and industrial organizations marked with and asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard. Bright Bolt and Nut Manufacturers General Post
8、Office Association Institution of Naval Architects Bright Steel Bar Association Metal Thread Screw Manufacturers British Constructional Steelwork Association Association National Physical Laboratory British Cycle and Motor Cycle Oil Companies Materials Committee Manufacturers and Traders Society of
9、Motor Manufacturers and British Steel Wire Industries Association Traders Cold Headed Heat Treated Bolt Association Washer Manufacturers Association Coil Spring Federation Research Bolt and Nut Manufacturers Organization Spring Washer Manufacturers Council of British Manufacturers of Petroleum Equip
10、ment Amendments issued since publication Amd. No. Date Comments 1879 January 1976 Indicated by a sideline in the marginBS1802:1951 BSI 07-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii Section 1. General 1 Scope 1 2 Designation 1 Section 2. Manufacture 3 Material 1 4
11、Heat treatment and hardness 1 5 Closing and test for permanent set 1 6 Ends 2 7 Tangling 2 8 Cranking 2 9 Finish 2 10 Shape 2 11 Dimensions 2 Table 1 Sampling size for test for permanent set 1 Table 2 Clearances 2 Table 3 Type A single coil square section spring washers 3 Table 4 Type B single coil
12、rectangular section spring washers 4 Table 5 Type C single coil girder section spring washers 5 Table 6 Type D double coil spring washers 6 British Standards for bolts, nuts and related subjects Inside back coverBS1802:1951 ii BSI 07-1999 Foreword In order to keep abreast of progress in the industri
13、es concerned, British Standards are subject to periodical review. Suggestions for improvement will be recorded and in due course brought to the notice of the committees charged with the revision of the standards to which they refer. A complete list of British Standards, numbering over4000, indexed a
14、nd cross-indexed for reference, together with an abstract of each standard, will be found in the Institutions Yearbook. This British Standard has been prepared under the authority of the Mechanical Engineering Industry Standards Committee, in response to a request from the Society of Motor Manufactu
15、rers and Traders. Steel spring washers have been standardized overseas, mainly in the railway field, while standardization in this country has concentrated on the aircraft industry, in which special attention to the degree of flatness of faces has been necessary. It has, therefore, been found advisa
16、ble to differentiate between steel spring washers intended for aircraft work and those for automobile and general engineering purposes, with which this British Standard is concerned. The term “lock washer” has been omitted from the title and text of the standard as it has been agreed that a “spring
17、washer” is not necessarily a “lock washer.” Certain types of spring washer are available to which the latter term does apply, and, since details of them are not included in the specification, it is considered that the use of the term would be misleading. The standard is primarily concerned with dime
18、nsions, but to assist in reducing the wide range of stock sections of wire, only one dimensional grade has been given for each of types A, B and D. Clauses relating to material, heat treatment, hardness and certain test requirements are also included. In accordance with BSI policy concerning the int
19、roduction of metric standards, this imperial standard has been declared obsolescent. It will be made obsolete in due course. 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
20、 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, pagesi andii, pages1 to6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had ame
21、ndments incorporated. This will be indicated in the amendment table on the inside front cover.BS1802:1951 BSI 07-1999 1 Section 1. General 1 Scope This British Standard covers steel spring washers of helical construction and of the following types intended for automobile and general engineering purp
22、oses: A. Single coil square section. B. Single coil rectangular section. C. Single coil girder section. D. Double coil. Washers supplied in accordance with this specification shall be for right-hand threads, unless otherwise specified by the Purchaser. 2 Designation The washers shall be designated b
23、y the nominal size of the bolts with which they are used, as given in Col.1 of Table 3 to Table 6 inclusive. Section 2. Manufacture 3 Material Spring washers complying with the provisions of this British Standard shall be manufactured from steel complying with any one of the steels in the En.42 rang
24、e specified in BS970, “Wrought steels.” 4 Heat treatment and hardness a) The washers shall be hardened and tempered after coiling. The manufacturer shall then carry out two hardness tests from each section and type of washer in each batch after heat treatment, having previously removed any decarburi
25、zed material by grinding. b) The hardness of the finished washers, after preparation as in Clause4 a), and as determined by a diamond pyramid test, shall be within the limits of400/500 D.P.N., or its equivalent by other suitable hardness testing machines. 1) 5 Closing and test for permanent set a) S
26、ingle coil washers. Sample washers shall be selected from batches in accordance with Table 1. The samples 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 the
27、n be repeated twenty times in quick succession, after which the free height shall not have been further reduced. b) Double coil washers. Sample washers shall be selected from batches in accordance with Table 1. The samples shall be completely closed; on release of the pressure the free height of eac
28、h washer shall be not less than three 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 reduced. Table 1 Sampling size for test for permanent set 1) BS860, “Approxim
29、ate comparison of hardness scales.” Size of batch Number in sample Up to and including200 201 to1000 1001 to5000 5001 to10000 Over10000 5 10 20 30 40BS1802:1951 2 BSI 07-1999 6 Ends The ends of washers shall not abut when the washer is in the closed condition. 7 Tangling Single coil washers having a
30、 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. 8 Cranking Double coil washers shall be cranked in such a manner that the washer lies flat when closed under compression. 9 F
31、inish Steel spring washers complying with this British Standard shall be of “self-colour” finish and free from scale. NOTEIf washers are required to be of any special finish, e.g.japanned or plated, this shall be specified and agreed between purchaser and manufacturer. 10 Shape During use the washer
32、s shall remain circular and their section shall be such as not to cause them to spread when set down by a nut, under normal service conditions. NOTEThe dimensions given in Table 3, Table 4 and Table 5 are based on the use of standard square and rectangular wire sections which, after coiling, produce
33、s washers of trapizoidal section, having the inner periphery thicker than the outer but with the mean in accordance with those dimensions given in the appropriate tables. 11 Dimensions a) Nominal size. The nominal size of the finished washer shall be that shown in Col.1 of Table 3 to Table 6 inclusi
34、ve. 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 2. Table 2 Clearances 1 2 3 Nominal diameter of bolt Clearance in the free condition Min. Max. Up to and including 2B.A. and 3 / 16 in. 1 / 4in. up to a
35、nd including 1 / 2in. 9 / 16in. upwards in. 0.008 0.0156( 1 / 64 ) 0.0312( 1 / 32 ) in. 0.0156( 1 / 64 ) 0.0312 ( 1 / 32 ) 0.0625( 1 / 16 ) NOTEThe clearances given in Table 2 for bolts having nominal diameters up to and including2B.A. and 3 / 16 in. have been calculated on the fractional bolt size.
36、 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.BS1802:1951 BSI 07-1999 3 Table 3 Type A single coil square section spring washers 1 2 3 4 Nominal size of washer (dia. of bolt) Nominal
37、outside diameter D Nominal mean width and thickness W=T in. in. in. S.W.G. 1 / 8(and6 B.A.) 5 / 32(and4 B.A.) 2 B.A. (and 3 / 16 ) 1 / 4 5 / 16 3 / 8 7 / 16 1 / 2 9 / 16 5 / 8 3 / 4 7 / 8 1 1 1 / 8 1 1 / 4 1 3 / 8 1 1 / 2 1 3 / 4 2 0.205 0.252 0.330 0.425 0.503 0.590 0.677 0.763 0.880 0.976 1.165 1.
38、360 1.526 1.690 1.865 1.990 2.186 2.560 2.810 0.032 0.040 0.064 0.072 0.080 0.092 0.104 0.116 0.128 0.144 0.176 0.212 0.232 0.252 0.276 0.276 0.312 0.375 0.375 21 19 16 15 14 13 12 11 10 9 7 5 4 3 2 2 BS1802:1951 4 BSI 07-1999 Table 4 Type B single coil rectangular section spring washers 1 2 3 4 5 6
39、 Nominal size of washer (dia.ofbolt) Nominal outside diameter D Nominal width W Nominal thickness T in. in. in. S.W.G. in. S.W.G. 1 / 8(and6 B.A.) 5 / 32(and4 B.A.) 2 B.A. (and 3 / 16 ) 1 / 4 5 / 16 3 / 8 7 / 16 1 / 2 9 / 16 5 / 8 3 / 4 7 / 8 1 1 1 / 8 1 1 / 4 1 3 / 8 1 1 / 2 1 3 / 4 2 0.237 0.300 0
40、.387 0.465 0.600 0.694 0.789 0.851 1.009 1.072 1.276 1.442 1.624 1.750 1.936 2.062 2.312 2.686 3.062 0.048 0.064 0.092 0.092 0.128 0.144 0.160 0.160 0.192 0.192 0.232 0.252 0.281 0.281 0.312 0.312 0.375 0.437 0.500 18 16 13 13 10 9 8 8 6 6 4 3 0.032 0.032 0.048 0.064 0.064 0.064 0.064 0.092 0.092 0.
41、128 0.128 0.128 0.187 0.187 0.187 0.187 0.187 0.250 0.250 21 21 18 16 16 16 16 13 13 10 10 10 BS1802:1951 BSI 07-1999 5 Table 5 Type C single coil girder section spring washers 1 2 3 4 5 6 7 8 9 Nominal size of washer (dia. of bolt) Nominal outside dia. D Thickness (after coiling) T Width W Light se
42、ries Heavy series Light series Heavy series Light series Heavy series in. in. in. in. S.W.G. in. S.W.G. in. in. 1 / 8(and6 B.A.) 5 / 32(and4 B.A.) 2 B.A. (and 3 / 16 ) 1 / 4 5 / 16 3 / 8 7 / 16 1 / 2 9 / 16 5 / 8 3 / 4 7 / 8 1 1 1 / 8 1 1 / 4 1 3 / 8 1 1 / 2 0.253 0.284 0.316 0.421 0.526 0.610 0.693
43、 0.755 0.876 0.967 1.140 1.265 1.418 1.571 1.750 1.875 2.108 0.344 0.463 0.548 0.658 0.749 0.839 0.960 1.059 1.250 1.429 1.608 1.733 1.914 2.039 2.218 0.064 0.064 0.064 0.080 0.104 0.116 0.128 0.128 0.144 0.160 0.187 0.187 0.203 0.219 0.250 0.250 0.312 16 16 16 14 12 11 10 10 9 8 0.080 0.104 0.116 0
44、.144 0.160 0.176 0.192 0.212 0.250 0.281 0.312 0.312 0.344 0.344 0.375 14 12 11 9 8 7 6 5 0.056 0.056 0.056 0.070 0.091 0.102 0.112 0.112 0.126 0.140 0.164 0.164 0.178 0.192 0.219 0.219 0.273 0.070 0.091 0.102 0.126 0.140 0.154 0.168 0.186 0.219 0.246 0.273 0.273 0.301 0.301 0.328BS1802:1951 6 BSI 0
45、7-1999 Table 6 Type D double coil spring washers 1 2 3 4 5 6 Nominal size of washer (dia.ofbolt) Nominal outside diameter D Nominal width W Nominal thickness T in. in. in. S.W.G. in. S.W.G. 1 / 8(and6 B.A.) 5 / 32(and4 B.A.) 2 B.A. (and 3 / 16 ) 1 / 4 5 / 16 3 / 8 7 / 16 1 / 2 9 / 16 5 / 8 3 / 4 7 /
46、 8 1 1 1 / 8 1 1 / 4 1 3 / 8 1 1 / 2 0.237 0.300 0.364 0.513 0.576 0.694 0.757 0.851 1.008 1.071 1.236 1.401 1.566 1.749 1.936 2.061 2.312 0.048 0.064 0.080 0.116 0.116 0.144 0.144 0.160 0.192 0.192 0.212 0.232 0.252 0.281 0.312 0.312 0.375 18 16 14 11 11 9 9 8 6 6 5 4 3 0.032 0.032 0.032 0.040 0.04
47、8 0.048 0.064 0.064 0.064 0.080 0.080 0.092 0.128 0.128 0.128 0.128 0.128 21 21 21 19 18 18 16 16 16 14 14 13 10 10 10 10 10BS1802:1951 BSI 07-1999 British Standards for bolts, nuts and related subjects BS57, B.A. bolts, screws and nuts. BS84, Parallel screw threads of Whitworth form. BS93, Screw th
48、reads, British Association, with tolerances for sizes Nos.0 to15 B.A. BS192, B.S.W. and B.S.F. open-ended carbon steel spanners. (With amendment specifying dimensions and marking of spanners for use with unified hexagon heads.). BS325, Black cup and countersunk bolts and nuts. BS450, Machine screws
49、and machine screw nuts. BS811, Cycle threads. BS856, Wing nuts. BS916, Black bolts and nuts. Hexagon and square B.S.W. and B.S.F. BS1083, Bolts, nuts and set-screws (machine bolts) B.S.W. and B.S.F. BS1580, Unified screw threads. BS1768, Unified precision hexagon bolts, screws and nuts (U.N.C. and U.N.F. threads) normal series. BS1769, Unified black hexagon bolts, screws and nuts heavy series. BS1981, Unified machine screws and machine screw nuts. BS2061,
