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Originally Posted by unregistered
the thread engagement length is 0.39" for 1/4" NPT
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Yeah, if you can get them in straight. Tried every thing I can think of. Even filed a bit more taper. I worked with injection molds all my life and I know if I sent out a mold with threads like that it would leak. There CNC cut so they are really tight and I don't think there is any taper.