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Old 08-02-2016, 09:18 PM   #1
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Mate EMT to NPS/NPT Pipe Threads?


Hello,

Is it possible to mate EMT and NPS/NPT pipe threads?

I have an security camera mount (aluminum pipe) that the manufacturer states "will work with NPS or NPT threads", but it is really tight when attempting to mate with standard steel plumbing pipe. I can also see that the camera mount threads are starting to get chewed up a bit and have stopped before too much more damage. However, using an EMT coupling on the aluminum pipe for testing finds the fit a breeze. Regardless of the manufactures information, it looks as though the merging of plumbing and electrical pipe hardware is not working here.

So, is there any easy way to alter either set of threads to make the combination work? If not, I will just take the project to a machine shop and let them deal with it.


Peace,
Dr. Z.

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Old 08-02-2016, 09:59 PM   #2
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Re: Mate EMT to NPS/NPT Pipe Threads?


Quote:
I have an security camera mount (aluminum pipe) that the manufacturer states "will work with NPS or NPT threads", but it is really tight when attempting to mate with standard steel plumbing pipe.
Ayuh,.... It sounds like the threads on this piece are boogered up,...

Chase 'em with an appropriate die, 'n it oughta be good as new,....

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Old 08-02-2016, 10:48 PM   #3
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Re: Mate EMT to NPS/NPT Pipe Threads?


NPT threads are tapered and I believe NPs threads are straight- sounds like your tapered pipe threads are getting tight
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Old 10-28-2016, 10:26 PM   #4
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Re: Mate EMT to NPS/NPT Pipe Threads?


Your camera mount is likely threaded for an electrical 1/2" fitting. Electrical 1/2" fittings thread into mechanical 1/2" fittings too.....they are both NPT. Tapered? Yes.
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Old 01-18-2017, 04:10 PM   #5
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Re: Mate EMT to NPS/NPT Pipe Threads?


Quote:
Originally Posted by Zeigh View Post
Hello,

Is it possible to mate EMT and NPS/NPT pipe threads?

I have an security camera mount (aluminum pipe) that the manufacturer states "will work with NPS or NPT threads", but it is really tight when attempting to mate with standard steel plumbing pipe. I can also see that the camera mount threads are starting to get chewed up a bit and have stopped before too much more damage. However, using an EMT coupling on the aluminum pipe for testing finds the fit a breeze. Regardless of the manufactures information, it looks as though the merging of plumbing and electrical pipe hardware is not working here.

So, is there any easy way to alter either set of threads to make the combination work? If not, I will just take the project to a machine shop and let them deal with it.


Peace,
Dr. Z.

keep in mind that pipe sizes refer to inside diameter, and many trades use the same inside diameter, but the wall thickness would differ
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Old 01-22-2017, 12:32 PM   #6
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Re: Mate EMT to NPS/NPT Pipe Threads?


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Originally Posted by KPDMinc View Post
keep in mind that pipe sizes refer to inside diameter, and many trades use the same inside diameter, but the wall thickness would differ
Ayuh,.... While that is in fact true,....

1/2" tapered pipe thread, is still 1/2" tapered pipe thread regardless the thickness of the pipe,...

'n in My experience, 1/2" tapered pipe thread used in electrical stuff is the same 1/2" tapered pipe thread used in plumbin',...
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Old 01-23-2017, 10:01 AM   #7
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Re: Mate EMT to NPS/NPT Pipe Threads?


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Originally Posted by Bondo View Post
Ayuh,.... While that is in fact true,....

1/2" tapered pipe thread, is still 1/2" tapered pipe thread regardless the thickness of the pipe,...

'n in My experience, 1/2" tapered pipe thread used in electrical stuff is the same 1/2" tapered pipe thread used in plumbin',...
But there ARE differences - 1/2" EMT outside diameter is MUCH smaller than say, PVC Coated Rigid 1/2"... just assumed there to be a slight difference between trades...
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Old 01-23-2017, 05:29 PM   #8
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Re: Mate EMT to NPS/NPT Pipe Threads?


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Originally Posted by KPDMinc View Post
But there ARE differences - 1/2" EMT outside diameter is MUCH smaller than say, PVC Coated Rigid 1/2"... just assumed there to be a slight difference between trades...
Ayuh,... 1/2" Emt is so thin, ya use a connector adapter for 1/2" pipe threads,...
The tubin' itself isn't threaded,...

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