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BS 325:1947

Specification for black cup and countersunk bolts and nuts (British Standard)

Nominal sizes $9D in to 1 in. Dimensions for cup head bolts with square, oval and nibbed shanks, and countersunk headed bolts with square and nibbed shanks for use on steel work and wood work; square and hexagon nuts. Lengths of thread and their tolerances, form of end of bolt shank, quality of steel.

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British Standards Institution [bsi]

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