9:41 PM
@Martin They don't give a thread size for npt fittings. So I don't know
@Martin I did a quick search and it gave me a chart for npt pipe threads. It says 3/8 inch pipe is 18 TPI
I do know that the hole I drilled at 9/16 is slightly smaller than the threads but the solid part of the pipe is a tiny tiny bit smaller than the hole
This is the thread and hole I have.