BS 57:1951
Specification. B.A. screws bolts and nuts
Heads: cheese, round, countersunk, raised-countersunk, hexagonal; hexagonal nuts, ordinary and locknut; range No. 0 to No. 16 B.A. Standard lengths of screws.
Heads: cheese, round, countersunk, raised-countersunk, hexagonal; hexagonal nuts, ordinary and locknut; range No. 0 to No. 16 B.A. Standard lengths of screws.
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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