Machine Design
Cap screws are

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

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Machine Design
Form coefficient of spring is

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

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