NPT pipe plug set beneath the surface
NPT pipe plug set beneath the surface
(OP)
i have to machine a few standard NPT thread for exaple 1/8 27tpi and a few others i was supplied the standars plugs, if i mill a standard 1/8 27 internal the plugs sit above the part, does anybody have an idea of where i could compensate to make the plug sit beneath the surface. any help would be appreciated!!





RE: NPT pipe plug set beneath the surface
RE: NPT pipe plug set beneath the surface
I believe they are referred to as "internal" pipe plugs.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada
RE: NPT pipe plug set beneath the surface
RE: NPT pipe plug set beneath the surface
Regards,
Mike
RE: NPT pipe plug set beneath the surface
RE: NPT pipe plug set beneath the surface
RE: NPT pipe plug set beneath the surface
RE: NPT pipe plug set beneath the surface
Regards,
Mike
RE: NPT pipe plug set beneath the surface
RE: NPT pipe plug set beneath the surface
Do you just drill a hole and then tap with a pipe tap, or do you also taper ream first? For a 1/8-27 NPT you should drill with an 11/32" bit, then ream with a taper pipe reamer (3/4 in. to the foot). The deeper you ream, the deeper the tap will go and the deeper the plug will seat.
As long as the female material is thick enough and the plug is tightened to the same torque, it will seal the same. What you don't want is to go so deep that the plug protrudes on the inside wall, since this means that some of the threads aren't mating and you might not get a good seal
Don
Kansas City
RE: NPT pipe plug set beneath the surface
RE: NPT pipe plug set beneath the surface
{how about Lee plugs if it doesn't need removing, or SAE O-Ring seals if you don't want leaks?}
RE: NPT pipe plug set beneath the surface
Actually, I think eromlignod's advice to use a tapered ream is the most sensible.
RE: NPT pipe plug set beneath the surface
RE: NPT pipe plug set beneath the surface
h
RE: NPT pipe plug set beneath the surface