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Strength of Screw Threads of Whitworth Form

Published online by Cambridge University Press:  28 July 2016

J. V. Inglesby
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Summary

A Stress analysis of screw threads of Whitworth form has been performed.

The critical stress in the threads is a shear stress, and this may be expressed simply in the form:–

where

Smax=shear stress.

f=distribution factor.

= 1.0 when screw and nut are both in tension or compression.

= 2.0 when screw and nut are in tension and compression respectively, unless specially designed for an improved distribution of load.

k = coefficient, depending mainly on fit, but also on pitch of threads, L and D.

<0.8 for close fit.

<0.9 for medium fit.

<1.0 for free fit.

P=axial load.

L=length of engagement.

D=nominal diameter.

Type
Research Article
Information
The Aeronautical Journal , Volume 50 , Issue 429 , September 1946 , pp. 710 - 717
Copyright
Copyright © Royal Aeronautical Society 1946

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References

1. British Standard Specification for Screw Threads of Whitworth Form. B.S. No. 84-1940. British Standards Institution, May 1940.Google Scholar
2. Martinaglia, L. Bolted Joints, Present Position of Technique. The Engineer's Digest, July 1942.Google Scholar
3. Roark, Raymond J. Formulas for Stress and Strain. McGraw Hill Book Company, Aug. 1938.Google Scholar