Machine Design
Cap screws are

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

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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 tooth above the pitch surface
Surface of the top of the tooth

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