Machine Design
The elasticity is the property of a material which enables it to

Resists fracture due to high impact loads
Draw into wires by the application of a tensile force
Regains its original shape after deformation when the external forces are removed
Retain deformation produced under load permanently

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Machine Design
Set screws are

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

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