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BS 1769:1951
Specification. Unified black hexagon bolts, screws, nuts (UNC & UNF threads). Heavy series (British Standard)
Dimensions, general requirements for sizes $9H in to 2 in. Dimensions of bolts, screws, ordinary nuts, lock nuts, slotted nuts, bolts faced under the head and machined on shank, machined nuts. Formulae for calculation of dimensions for bolts, screw heads, nuts in intermediate sizes, and sizes larger than 2 in.
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British Standards Institution [bsi]