Co-operating organizations

The Mechanical Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations:—

Admiralty*	Institute of Petroleum
Air Ministry	Institution of Civil Engineers
Association of Consulting Engineers	Institution of Gas Engineers
(Incorporated)	Institution of Heating and Ventilating
Associated Offices Technical Committee	Engineers
British Chemical Plant Manufacturers’	Institution of Mechanical Engineers
Association	Institution of Mechanical Engineers
British Compressed Air Society	(Automobile Division)
British Electrical and Allied Manufacturers’	Institution of Production Engineers*
Association*	Locomotive Manufacturers’ Association*
British Engineers’ Association*	Machine Tool Trades Association*
British Internal Combustion Engine	Ministry of Fuel and Power
Manufacturers’ Association*	Ministry of Labour and National Service
British Iron and Steel Federation*	(Factory Department)
British Railways, The Railway Executive*	Ministry of Supply*
Crown Agents for the Colonies*	Ministry of Transport*
Department of Scientific and Industrial	Ministry of Works
Research	Office of the High Commissioner for India*
Engineering Equipment Users’ Association*	War Office
Institute of Marine Engineers

The Government departments and scientific 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 British Standard:—

Aircraft Bolt and Nut Manufacturers	Metal Thread Screw Manufacturers’
Association	Association (Rolled Screw Section)
Bright Bolt and Nut Manufacturers	Metal Thread Screw Manufacturers’
Association	Association (Turned Screw Section)
Bright Steel Bar Association	National Physical Laboratory
British Constructional Steelwork Association	Oil Companies Materials Committee
British Cycle and Motor Cycle Manufacturers’	Radio Industry Council
and Traders’ Union Ltd	Society of British Aircraft Constructors
British Steel Wire Industries Association	Society of Motor Manufacturers and
Cold Headed Heat-treated Bolt Association	Traders Ltd.
Council of British Manufacturers of Petroleum	Telecommunications, Engineering and
Equipment	Manufacturing Association
General Post Office	Washer Manufacturers’ Association
Institution of Naval Architects

This British Standard, having been approved by the Mechanical Engineering Industry Standards Committee and endorsed by the chairman of the Engineering Divisional Council, was published under the authority of the General Council on 31 March 1951

Amendments issued since publication

Amd. No.	Date of issue	Comments
4329	October 1961
5901	August 1966
1528	August 1974	Indicated by a sideline in the margin

BS 57:1951

Specification. B.A. screws bolts and nuts

Current

Published:

31 Mar 1951