Plug tap

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(Mech.) a screw-cutting tap with a slightly tapering end.

See also: Tap

References in periodicals archive ?
Advance the tap a half turn, back up a quarter turn and repeat until the hole is threaded as far as the taper or plug tap can advance.
plug tap chamfer length = 3 to 5 times pitch length
Don't; attempt to use a taper or plug tap, which because of the tapered nose would cut into the lip or end of the gas chamber.
On the above hole, use a plug tap to calculate the chamfer length: 0.