2:42 AM
@Martin I got a 9/16-20 UNEF-2B HSS tap and the threads look kinda close but not right at the same time. The size of the bit fits sort of tightly in the hole I drilled. But it doesn't make any good threads. I am ordering an 11/16-18 HSS tap. Right handed to see if that will work since 9/16 is the exact size of the hole.
9 hours later…
11:20 AM
@ScientistSmithYT To speak the truth I made an imperial/us tapered thread. I'd try to make a decent thread in the easiest obtainable/doable norm, perhaps even straight, and then get an adapter to match the valve to the thread.
3 hours later…
2:35 PM
@ScientistSmithYT - NPT is weirdly listed. IIRC, the size (3/8" in your case) is actually the inside diameter of the hole in the fitting. Why they use the silliness for this stuff is beyond me. It took me a day of searching to figure out what I needed to use. What you are working on appears to be for compressed air. If that's what it is, then you should have no worries about inherent dangers.
I guess what I'm really trying to state is, the NPT size doesn't really relate to the threads you are cutting, but it is what it is. There is a specific taper to it which helps provide the sealing action. I see you used teflon tape on the air chuck side of it, which is a good thing to assist in sealing. Use that or liquid teflon. Either work great.
This page gives the sizes for a tap drill on the 3/8" is 37/64" which is just 1/64" larger than the 9/16" hole you drilled.
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