oes anyone have a definitive reference for the required tap depth for a 3/8" NPT port in ball valves. I understand from reading on here the tap depth is not usually called out, but if anybody has a standard or a guide that I could check our test parts against, I would much appreciate it.
I have a bonnet with 4 measurable ports. On three of them the depth of full thredas range from .330 to .350 and the 4th one is .470. This variation of almost 3 threads seem excessive. All the ports gaged within 1/2 turn of each other and the drill diameters are all within .003, so i ar struggling to figure out how these port differ so much in the threading.
Hand tight plus wrench make up is 7 1/2 turns which is 7.5/18 = .417.  The table in the website says .

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