Cite
HARVARD Citation
Institution,, B. (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.. [Online]. London : British Standards Institution. Available from: http://access.bl.uk/ark:/81055/vdc_100104918378.0x000001