Machine Design
A stud

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

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Machine Design
Crowning on pulley helps

In decreasing the slip of the belt
To increase pulley life
To keep the belt in centre on a pulley while it is in motion
In increasing the slip of the belt

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