Machine Design
If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited

Acme
Square
Buttress
BSW

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Machine Design
A tap bolt

Has pointed threads
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
Has both the ends threaded

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