What size drill bit do I use for a 1/8 NPT tap?
2020-3-28 · 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. One may also ask, how do you drill a 1/4 NPT tap? National Pipe Thread Taper (NPT) is a U.S. standard for tapered threads used on threaded pipes and fittings.Get Price