Whats the difference between plumbing pipe threads and conduit pipe threads?
Plumbing pipe threads are squared and conduit pipe threads are tapered.
For the record, there is NO difference between conduit threads and regular pipe threads. They are BOTH tapered. The difference in in the couplings, which are made with straight threads, so that when assembled, there are no threads showing outside of coupling for support strength.
You could use regular pipe dies for electrical conduit (ridgid or IMC) threads. I do it everyday. When you purchase couplings however, plumbing couplings have tapered threads started from each end and electrical couplings have straight through threads.
Conduit bodies can have mild tapered threads also, to allow the tightening of the body to the pipe. Re: Straight Thread Vs. Re: Straight Thread Vs.
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