Machine Design
A tap bolt

Has pointed threads
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
Has a head on one end and a nut fitted to the other

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Machine Design
Machine screws are

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

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