I have to confess to using plumbing nipples occasionally when I was "needy". They were always reamed carefully to take off the nasty sharp edge.
What exactly are running threads,..is it like a long close nipple??
Russ, running threads are sometimes called "allthread", too. It's just a piece of GRc with a continuous thread. It's usually sold in 3 foot sections (and costs a lot).
Standard pipe threads have a taper of 3/4" per foot. Running thread has no taper, the threads are straight.
It's great stuff for cutting into short lengths for use with locknuts for connecting enclosures together, etc.; an "adjustable nipple", so to speak.
Conduit couplings, unlike plumbing fittings, are also made with a straight thread. You can take one and spin it all the way up and down a piece of running thread much like a nut would run up a piece of threaded rod.
