is the standard cutting die with a 3/4-inch taper per foot (1 in 16) requirement + the FPN note referencing the ANSI/ASME B.1.20.1-1983 an NPT (national pipe taper) as found on a typical plumbing threader/die or is it an NPSM (national pipe straight mechanical) which usually has to be specified + special ordered? should conduit threaded in the field have a taper thread or a straight thread? factory threads on conduit look tapered to me. i have heard NPSM (straight thread dies) also called conduit dies ; but is this really true? thanks
