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

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

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Machine Design
Cap screws are

Slotted for a screw driver and generally used with a nut
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

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