Machine Design
A stud

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

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Machine Design
Form coefficient of spring is

Its capability of storing energy
Ratio of coil diameter to wire diameter
Concerned with strength of wire of spring
Load required to produce unit deflection

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