Machine Design
Set screws are

Used to prevent relative motion between parts
Similar to stud
Similar to small size tap bolts except that a greater variety of shapes of heads are available
Slotted for a screw driver and generally used with a nut

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Machine Design
The face of the tooth is the

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

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