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Published online by Cambridge University Press: 28 July 2016
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.