Machine Design
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

τ/2
4 τ
τ
2 τ

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Machine Design
A stud

Has a head on one end and a nut fitted to the other
Has both the ends threaded
Has pointed threads
Has head at one end and other end fits into a tapped hole in the other part to be joined

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