Machine Design
A bolt

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

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Machine Design
Spring stiffness is

Its ability to absorb shocks
Load required to produce unit deflection
Ratio of coil diameter to wire diameter
Its capability of storing energy

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