Machine Design
Form coefficient of spring is

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

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Machine Design
A hollow saddle key is

A taper key which fits half in the key way of hub and half in the key way of shaft
Provided in pairs at right angles and each key is to withstand torsion in one direction only
A taper key which fits in a key way of the hub and is flat on the shaft
A taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft

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