Machine Design
If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited

Acme
Buttress
BSW
Square

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Machine Design
In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of

Combined effect of transverse shear stress and bending stress in the wire
Combined effect of transverse shear stress and curvature of wire
Combined effect of bending stress and curvature of the wire
Combined effect of torsional shear stress and transverse shear stress in the wire

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