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BS 3410:1961
Specification for metal washers for general engineering purposes (British Standard)
Specifies requirements for materials, finish and dimensions for the following types of metal washers; small and large bright washers for use with B.A. and American Number size fasteners; small and large bright washers in heavy and light gauge for use with UNC, UNF, B.S.W. and B.S.F. fasteners; medium and large bright washers for automobile purposes for use with UNC, UNF, B.S.W. and B.S.F. fasteners; ordinary and large black washers; small light gauge black washers; round black washers with square holes for woodwork and timber constructions; square black washers with round holes; square or D-shaped taper washers.
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British Standards Institution [bsi]