Machine Design
The square threads are usually found on

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

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

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

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