Machine Design
Machine 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 two parts
Slotted for a screw driver and generally used with a nut
Similar to stud

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Machine Design
Form coefficient of spring is

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

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