Machine Design
The face of the tooth is the

Width of the tooth measured along the pitch circle
Surface of the tooth below the pitch surface
Surface of the tooth above the pitch surface
Surface of the top of the tooth

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Machine Design
A stud

Has 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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