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 ?
A plug tap splits the difference between the two and has some taper to the cutting edges.
Basic gunsmithing skills: Lathe setup, tapping, grinding: these basic metalworking skills will put you in position to take on most of the home gunsmithing chores you'll encounter
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.
Scoping 1896 Mauser actions: drilling and tapping for Weaver bases on 1896 Mausers
* plug tap chamfer length = 3 to 5 times pitch length
Back to basics: taps
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.
Gunsmiths do make mistakes sometimes: a tale of drilling and tapping a blind hole in a barrel and how a bad mistake in the shop turned out for the best
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.
Ask the gunsmith
On the above hole, use a plug tap to calculate the chamfer length: 0.0909 x 4 = 0.3636
Drilling depths for easy tapping
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