NPT Internal Threads

[Wongster]

Yes sir, it's close enough to screw smoothly onto the male thread.

I took all the measurements from the sample given to me, no knowing how deep to cut or how big the bore should be. The measurements from the sample don't seem to match anything from the chart I found online. So I just test when I think it's deep enough. But for other sizes, I've nothing to test on.