Machine Design
If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited

Buttress
BSW
Acme
Square

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

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