Machine Design
In order to obtain bolt of uniform strength

Drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread
Increase its length
Increase shank diameter
Tighten die bolt properly

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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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