Description

This British Standard specifies limits of sizes, and tolerances, for single start parallel screw threads of Whitworth form, for general engineering use.

This standard specifies the following thread series:

1. a coarse thread series, the British Standard Whitworth (B.S.W.) series, with nominal diameters in the range 1/8 in to 6 in.
2. a fine thread series, the British Standard fine (B.S.F.) series, with nominal diameters in the range 3/16 in to 4 1/4 in.
3. a supplementary selected thread (WHIT. S.) series with nominal diameters from 1/4 in to 7 in.
4. a truncated Whitworth form series.

This British Standard is intended for use with BS 919-2, which specifies the corresponding screw gauges.