Machine Design
An Involute pinion and gear are in mesh. If both have the same size of addendum, then there will be interference between the

Tip of the gear and flank of pinion
Flanks of both gear and pinion
Tip of both gear and pinion
Tip of the pinion and flank of gear

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Machine Design
A stud

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

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