Machine Design
A self locking screw has

Fine threads
Hole for inserting split pin
Course threads
Coefficient of friction is greater than tangent of load angle

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

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