Machine Design
The shock absorbing capacity of a bolt can be increased by

Grinding the shank
Tightening it properly
Increasing shank diameter
Making shank diameter equal to core diameter of thread

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Machine Design
The shear stress at a point in a shaft subjected to a torque is

Inversely proportional to the applied torque and the polar moment of inertia
Directly proportional to the applied torque and the polar moment of inertia
Directly proportional to the applied torque and inversely proportional to the polar moment of inertia
Directly proportional to the polar moment of inertia and to the distance of the point from the axis

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