Machine Design
The face of the tooth is the

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

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Machine Design
A bolt

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 both the ends threaded
Has a head on one end and a nut fitted to the other

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