Machine Design
A tap bolt

Has a head on one end and a nut fitted to the other
Has pointed threads
Has head at one end and other end fits into a tapped hole in the other part to be joined
Has both the ends threaded

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

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

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