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:

The Government departments and scientific and industrial 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:

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 1 September 1961

The following BSI references relate to the work on this standard:

Committee references MEE/60 MEE/60/6

Draft for comment A(MEE)4400

Foreword

This standard makes reference to the following British Standards:

BS 15, Structural steel.

BS 265, Cold rolled brass sheet, strip and foil, copper content 61.5 per cent minimum and under 64 per cent maximum.

BS 309, Whiteheart malleable iron castings.BS 310, Blackheart malleable iron castings.BS 1449, Steel plate, sheet and strip.

This British Standard has been prepared under the authority of the Mechanical Engineering industry Standards Committee.

Tables for plain washers have hitherto been included in standards for bolts, screws and nuts, but it has been felt for some time that these provisions did not adequately represent either users’ requirements or current manufacturing practice. The present standard, which is intended to supersede these existing tables,¹⁾ accordingly provides for metal washers in a greater variety of diameters and thicknesses and is based upon what experience has shown to be the greatest popular demand.

At first sight this may appear contrary to normal standardization procedure, but it is hoped that by establishing a standard series of metal washers which should meet most general engineering requirements, the demand for an unnecessary multiplicity of specials can in fact be eliminated.

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 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, pages i and ii, pages 1 to 14 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.

Part 1: Bright metal washers

1 Scope

Part 1 of this British Standard relates to bright metal washers for use with standard fasteners and for other general purposes.

Dimensions are given for large and small washers: one grade of thickness is specified for those intended for use with B.A. and American Number size fasteners and two grades of thickness are specified for washers for use with Unified, B.S.W. and B.S.F. fasteners. In addition, tables of dimensions for bright washers for automobile use are included in this part of the standard.

General requirements for material and finish of bright washers are also given.

2 Material

3 Finish

4 Coating

5 Dimensions

Part 2: Black metal washers

6 Scope

7 Material

8 Finish

9 Dimensions

BS 3410:1961

Specification for metal washers for general engineering purposes

Current

Published:

1 Sep 1961