Machine Design
The square threads are usually found on

Screw cutting lathes
Feed mechanism of machine tools
Spindles of bench vices
Railway carriage couplings

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Machine Design
In case of thick cylinders, the tangential stress across the thickness of cylinder is

Maximum at the inner surface and zero at the outer surface
Maximum at the inner surface and minimum at the outer surface
Maximum at the outer surface and minimum at the inner surface
Maximum at the outer surface and zero at the inner surface

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