Machine Design
Spring stiffness is

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

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Machine Design
Cap screws are

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

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