What size drill bit do I use for a 1/8 NPT tap?
2020-3-28 · Subsequently, one may also ask, how do you drill a hole in a 1/8 NPT? For a 1/8 npt tap requires an 'R' drill. Run your tap into the hole to the depth of the threads on the tap. Use a 1/8 fitting as a thread gauge to insure you have enough threads. Also Know, how do you drill a 1/4 NPT tap?Get Price