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Threading PVC? Answered

How do I pur inside/outside threads on pvc pipe?

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audreyobscuraBest Answer (author)2017-07-11

Your best bet is just buying threaded connectors and cementing them into the pipe.

If you really want to put threads on the outside of the pipe itself, I think you could do it with a wood threading kit? What size thread do you need?

I dont think you could with a metal pipe threading tool because the PVC is so much softer than metal, but then again, I've never tried.

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user

I thread 1/2 " PVC all the time. I use plumber's dies take it very slowly backing off frequently to prevent the dies from getting clogged. Works well. Use teflon tape to assemble.

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user

Plastic burns left from sawing can cause trouble. Outside the pipe they'll interfere with a good fit. On the inside they can collect and slow the water flow. You can remove them with a file or pocketknife, but sandpaper is easier to use and works great.

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plumbermike (author)2018-03-11

You can't thread sch 40(white) pvc. The walls of the pipe are too thin for threading.. I do thread sch 80 pvc (dark gray) the wall are thicker . You are limited to types of threads , npt (NATIONAL pipe thread) threads are tapered used in plumbing , in the US. Straight pipe threads have no taper .. more commonly used in electrical industry.. I don't use Teflon tape on plastic threads, will strip threads or crack the fitting, you screwing into. I use pipe joint compound compatible with plastic.. tells you on the can what types of material pipe joint compound is suitable for.. the dies to cut threads are expensive.

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