Machine Design
Spring index is

Its capability of storing energy
Load required to produce unit deflection
Indication of quality of spring
Ratio of coil diameter to wire diameter

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Machine Design
The contact ratio is the ratio of

Length of arc of approach to the circular pitch
Length of path of contact to the circular pitch
Length of arc of contact to the circular pitch
Length of arc of recess to the circular pitch

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Machine Design
A bolt

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
Is provided with pointed threads
Has a head on one end and a nut fitted to the other

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