Machine Design
Spring stiffness is

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

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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 stud
Similar to small size tap bolts except that a greater variety of shapes of heads are available

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