Is there any National Pipe Thread Straight (non-tapered, requires O-ring or compression olive) that is compatible, even loosely, with a machine thread threaded rod? I want to put a reducer on the end of a pipe threaded with NPTS and reduce to like 1/4 inch NPTS nominal and have that reducer ride on a 5/16-18 threaded rod. So it's like a shoring jack or lolly column, but really cheap, and the threaded rod can fit through a small clearance and guide the end of the pipe to the bearing point.
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NPS as defined in ASTM A 530 is all tapered and has no "O" rings or torque shoulders.
answered Aug 18 '19 at 19:26
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$\begingroup$ ok, so what is straight non-tapered threaded pipe called $\endgroup$ Aug 19 '19 at 22:15
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$\begingroup$ One choice would be the same pitch and profile as threaded rod or a fastener . $\endgroup$ Aug 21 '19 at 14:25
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British Standard parallel pipe threads aren't tapered (as the name implies), BSPP for short. That might work for you.
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$\begingroup$ might be a problem to find the tap/die set for cutting those threads. $\endgroup$ Jun 9 '21 at 17:16