Machine Design
Two shafts will have equal strength, if

Diameter of both the shafts is same
Angle of twist of both the shafts is same
Twisting moment of both the shafts is same
Material of both the shafts is same

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Machine Design
A bolt

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

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