Machine Design
Cap screws are

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

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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
Draw into wires by the application of a tensile force
Retain deformation produced under load permanently
Resists fracture due to high impact loads

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