I was taught the opposite: bolts are fasteners that have only partially
threaded shanks and those with fully threaded shanks are cap screws. A
relies on a nut for its fastening capability, whereas a screw fastens by
engaging with a tapped hole in the piece to which it is securing something.
The original usage of a tap bolt was for a tapped hole. Any fastener
with threads is a screw, ie wood screw, sheet metal screw, machine screw, set
screw, socket head cap screw and of course the afore mentioned hex(head)
cap screw. A tap bolt could be called a tap screw.
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