BS 916-1953 Specification for black bolts, screws and nuts, hexagon and square, with B.S.W. threads,
标准简介
BS 916-1953 Specification for black bolts, screws and nuts, hexagon and square, with B.S.W. threads, and partly machined bolts, screws and nuts, hexagon and square, with B.S.W. or B.S.F. threads
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