Plug tap

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

See also: Tap

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
I use a # 31 titanium-coated drill bit (Brownells 361-661-031) and their premium 6-48 3-flute plug tap (748-001-648) to make these holes.
* plug tap chamfer length = 3 to 5 times pitch length
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.
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: 0.0909 x 4 = 0.3636