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Anonymous Poster

NPSM female to NPT male

06/26/2007 10:59 AM

I need to connect a double check quick disconnect to a hose. The QD is 1/2" NPSM female threaded and the hose to pipe is 1/2 NPT male threaded. Using thread sealing compound will this be an acceptable connection? Service is intermitent and will be used to load/ unload lubricating oil with a 100 PSI max pump
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Codemaster
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Join Date: Jul 2005
Location: Stoke-on-Trent, UK
Posts: 4496
Good Answers: 137
#1

Re: NPSM female to NPT male

06/27/2007 4:38 AM

What does NPSM stand for? Is it a thread type? I hadn't heard of it (perhaps it's well-known in US but not here in UK) so I Googled it. Link below says thread sealing compound is not required.

http://www.parker.com/tfd/fittingsolutions/o7fittingsolutions.pdf

Codey

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dovrak
Active Contributor

Join Date: Apr 2007
Posts: 22
#2

Re: NPSM female to NPT male

06/27/2007 6:45 AM

why don you make a conector one side NPSM male and the othe NPT female????
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mareng
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Join Date: Jun 2007
Location: Gulf Coast
Posts: 209
Good Answers: 7
#3

Re: NPSM female to NPT male

06/27/2007 7:50 AM

I am assuming that the NPSM female is a swivel?

In order for this to seal correctly, the 1/2" NPT male fitting should have a 30° internal taper seat (female) for the corresponding NPSM male taper inside the swivel. If it doesn't, it won't seal properly.

Because this is a taper seat seal, no compound is necessary.

Codemaster, this is very similar to a BSPP connection, only NPT threads.

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garth
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Australia - Member - New Member Engineering Fields - Mechanical Engineering - New Member

Join Date: Sep 2006
Location: NSW Australia
Posts: 1101
Good Answers: 23
#4

Re: NPSM female to NPT male

06/27/2007 11:26 AM

NPSM is a parallel thread but it will mate with the NPT thread OK and with thread sealing will easily take 100PSI.

Just make sure you use similar materials

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