1、BRITISH STANDARD OBSOLESCENT MAY 1986 BS 3410:1961 Specification for Metal washers For general engineering purposes UDC 621.882.4BS3410:1961 This British Standard, having been approved by the MechanicalEngineering IndustryStandards Committee and endorsed by the Chairman oftheEngineering Divisional C
2、ouncil, was published under theauthority of the General Council on 1September1961 BSI 02-2000 The following BSI references relate to the work on this standard: Committee references MEE/60 MEE/60/6 Draft for comment A(MEE)4400 ISBN 0 580 34594 7 Co-operating organizations The Mechanical Engineering I
3、ndustry Standards Committee, under whose supervision 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 i
4、n the above list, together with the following, were directly represented on the Committee entrusted with the preparation of this standard: Admiralty* Gas Council Air Ministry High Commission of India* Associated Offices Technical Committee Institute of Marine Engineers Association of Consulting Engi
5、neers Institute of Petroleum (Incorporated) Institution of Civil Engineers British Chemical Plant Manufacturers Institution of Gas Engineers Association Institution of Heating and Ventilating British Compressed Air Society Engineers British Electrical and Allied Manufacturers Institution of Mechanic
6、al Engineers Association* Institution of Mechanical Engineers British Engineers Association* (Automobile Division) British Gear Manufacturers Association Institution of Production Engineers* British Internal Combustion Engine Locomotive and Allied Manufacturers Manufacturers Association* Association
7、 of Great Britain* British Iron and Steel Federation* Machine Tool Trades Association* British Railways, The British Transport Ministry of Labour (Factory Inspectorate) Commission* Ministry of Power Crown Agents for Oversea Governments and Ministry of Transport Administrations* Ministry of Works D.S
8、.I.R. National Engineering Laboratory National Coal Board Electricity Council, The Generating Board and National Physical Laboratory (D.S.I.R.)* the Area Boards in England and Wales Radio Industry Council* Engineering Equipment Users Association* War Office* Agricultural Engineers Association London
9、 Transport Executive, The British Black Bolt large black washers; small light gauge black washers; round black washers with square holes for woodwork and timber; square black washers with round holes; steel or malleable cast iron square or D-shaped taper washers. General requirements for material an
10、d finish are also given. NOTEThe washers specified in this standard are not suitable for use with the fasteners covered by BS3139, “High strength friction grip bolts for structural engineering” which includes its own provision for washers. 7 Material a) Steel washers. i) Flat. Unless otherwise speci
11、fied, flat washers shall be made from mild steel. ii) Taper. Taper washers shall be made from mild steel to BS 15, “Structural steel” with a tensile strength of 28/33 tons per sq in. b) Malleable cast iron type. These shall be made from either i) Malleable cast iron (whiteheart) in accordance with B
12、S 309, “Whiteheart malleable iron castings.” or ii) Malleable cast iron (blackheart) in accordance with BS 310, “Blackheart malleable iron castings.” 8 Finish The faces of the washers shall be reasonably flat, smooth and free from burrs. 9 Dimensions a) The dimensions of round black washers with rou
13、nd holes shall be in accordance withTable 7, Table 8 andTable 9. b) The dimensions of round black washers with square holes shall be in accordance with Table 10. c) The dimensions of square black washers with round holes shall be in accordance withTable 11. d) The dimensions of square or D-shaped black taper washers shall be in accordance with Table 12.
