Machine Design
Form coefficient of spring is

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

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Machine Design
Set screws are

Slotted for a screw driver and generally used with a nut
Used to prevent relative motion between parts
Similar to small size tap bolts except that a greater variety of shapes of heads are available
Similar to stud

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