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ridgid 0-r pipe threader #195931
08/31/10 06:37 PM
08/31/10 06:37 PM
evad73  Offline OP
Joined: Oct 2009
Posts: 10
I have a ridgid 0-r hand pipe threader. I don't ever remember replacing the dies. The teeth finally broke and need to be replaced. I went to the local plumbing supply house and ordered new dies, then I thought, aren't plumbers threads different than electrical. Is it necessary to use npsm dies or npt dies? HELP

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Re: ridgid 0-r pipe threader [Re: evad73] #195934
08/31/10 08:57 PM
08/31/10 08:57 PM
wire_twister  Offline
Joined: Jul 2007
Posts: 265
Georgia USA
NPT dies are fine for electrical applications, just cut the threads deep enough so the coupling or fitting bottoms on the pipe, looking for max thread engagement not pressure sealing ability.


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Re: ridgid 0-r pipe threader [Re: wire_twister] #195935
08/31/10 09:14 PM
08/31/10 09:14 PM
resqcapt19  Offline
Joined: Nov 2000
Posts: 2,148
Not only are NPT dies fine, they are required by 344.28.

Re: ridgid 0-r pipe threader [Re: resqcapt19] #195946
09/01/10 10:17 AM
09/01/10 10:17 AM
evad73  Offline OP
Joined: Oct 2009
Posts: 10
Thanks, this forum really helps....

Re: ridgid 0-r pipe threader [Re: evad73] #195949
09/01/10 11:37 AM
09/01/10 11:37 AM
renosteinke  Offline
Cat Servant
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
There's a little more to this than meets the die ... laugh

In nearly every 'ordinary' instance, electricians use ordinary 'plumbers' NPT dies.

However, when you are dealing with an established name like Rigid, or doing some specialty work, it's easy to get the wrong replacement inserts. Plus, the inserts are brand specific.

The best bet is to take the old inserts to a plumbing supply house and have them select the proper replacements.

Without getting too bogged down in the specifics, there are other thread patterns that also comply with "npt" (they simply have tighter tolerances); inserts with extra throat clearanc (for coated pipe), and inserts with different cutting edge profiles (for cutting different materials). There are also some oddball applications where a different threadform altogether is required - but that situation probably doesn't apply here.


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