Machine Design
A bolt

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
Is provided with pointed threads
Has a head on one end and a nut fitted to the other

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Machine Design
The creep in the belt is due to

Material of belt
Effect of temperature on belt
Unequal extensions in the belt due to tight and slack side tensions
Stresses beyond elastic limit of belt material

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