I am planning on inserting a threaded nipple through a 2" wall. What is the tight fit clearance hole that is needed for both a 5/8" and 1/2" NPT threaded nipple?
Thanks

Joe M.

Measure the outside diameter of the nipple and then find a drill bit slightly larger. Never heard of a 5/8 pipe nipple. 1/2" and then 3/4". Where are you measuring"