BSI British Standards - New standards for Whitworth screw theads

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7th February 2008

Source: BSI British Standards

BSI British Standards has just published a revised guide to the limits of sizes, and tolerances, for single start parallel screw threads of Whitworth form, for general engineering use.

The standards for Whitworth threads have remained unchanged since the last revision of BS 84 in 1956. The foreword to this ended with the following statement. “In conclusion it may be asked why the revision of this standard has been undertaken. The reason is that Whitworth threads will undoubtedly continue to be used for many years, especially on replacements or spare parts.”

The present revision of BS 84 has been undertaken because, fifty years on, this continues to be the case.

BS 84:2007 specifies the following thread series:
a) a coarse thread series, the British Standard Whitworth (B.S.W.) series, with nominal diameters in the range 1/8 in to 6 in.
b) 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.
c) a supplementary selected thread (WHIT. S.) series with nominal diameters from 1/4 in to 7 in.
d) a truncated Whitworth form series.

For more information visit www.bsigroup.com/bs84.

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