NPS & NPT.......?

[Crow Horse]

I'm currently looking at detail spray guns to clear coat my carved wood signs. I've noticed that the air inlet on the guns I've seen online are 1/4"NPS and my air hose is 1/4"NPT. I understand I'm looking at tapered & straight threads but in all the reviews I've read about various models, nothing is mentioned about this. Is it ok to use them together?

 

[Firebrick43]

You shouldn't, but with plenty of teflon tape it works normally. But why not put the ****** directly on the gun. They are available with in NPS with an oring seal.

 

[Walkers]

NPT works just fine in them, just don’t overtighten. I have a 1/4” NPT tap that I run in them to clean it up a wee bit, but it seems to work without it too.

 

[joe_padavano]

They make an NPS to NPT adapter for exactly this application. Why do it half-fast? In my case, I actually used a mini gauge/regulator from my spray gun manufacturer that also did the NPS-to-NPT conversion.

 

[Walkers]

They make an NPS to NPT adapter for exactly this application. Why do it half-fast? In my case, I actually used a mini gauge/regulator from my spray gun manufacturer that also did the NPS-to-NPT conversion.

The reason I do it is to eliminate overhang from the bottom of the gun. I regulate and dry my air at the wall, and commonly paint large items that are sitting on stickers on the ground, so need to get the gun low.

 

[Crow Horse]

This would work if a female to female adapter is used. I haven't been able to find a female NPS to male NPT adapter yet.

 

[yatg]

Get an NPS hose and make your transition to NPT away from the gun.

https://www.amazon.com/dp/B099K3N8YJ/?tag=atomicindus08-20

I'd probably cut the hose in half then get a couple of 1/4"npt barb fittings.

 

[Firebrick43]

Your gun has a male NPS fitting?

 

[Crow Horse]

Yep.

 

[Firebrick43]

Yep.

Interesting. I wonder when its removed if its an NPS female?

 

[PCustoms]

Yep.

Harbor freight?

Years ago I had a cheap gun that looked like that. Pretty sure s male QD connection screwed right in with a bit of Teflon tape. I might have had a small water separator or regulator there too, so long ago I forget.

 

[BillK]

Interesting. I wonder when its removed if its an NPS female?

I was thinking the same thing. Take the factory fitting out and see what the threads are in the gun. Then use an adapter like Joe P showed above.

 

[Wrench97]

Most guys use a regulator or moisture filter in-between the air line and gun

 

[alfadan]

Blow guns are the same way.

 

[The Cobbler]

NPS is straight threads, NPT is tapered. if the npt seals against the NPS , go for it.

 

[Crow Horse]

It's a Neiko 31207A HVLP gun.

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[dnschmidt]

It's really not a problem at all. All spray guns use the straight thread that you're showing it's normal, not anything special. You can put a 1/4 NPT female air line ****** over the straight thread just use a little Teflon tape on the mail straight fitting. I use spray gun regulators on my guns (RTI MR-1) which take care of this problem automatically but the cost of these regulators is more than you paid for that gun. It worked on your daddy's Binks and it will work on any spray gun made. People have done it this way for 50+ years.

 

[Crow Horse]

If it'll work without any issues, then I should be good to go using a 1/4 NPT hose. It just seems odd that this mismatch is an acceptable industry "standard". Thanks for everyone's input!

I'm still scratching my head as to why there's NPT, IPT, & IPS.....

 

[RAYJAY]

This would work if a female to female adapter is used. I haven't been able to find a female NPS to male NPT adapter yet.

why female to female ?? go from post 13 should always run a regulator at the spray gun, then a male or female snap fitting perfaable full bore

 

[joe_padavano]

The reason I do it is to eliminate overhang from the bottom of the gun. I regulate and dry my air at the wall, and commonly paint large items that are sitting on stickers on the ground, so need to get the gun low.

Better practice is to regulate at the gun to account for loss in the hose.

 

[Walkers]

Better practice is to regulate at the gun to account for loss in the hose.

I just used a gauge at the gun to check my wall regulator was providing the right gun pressure at flow then removed it. I have been using the same guns for many years and can tell if they need a minor adjustment pretty well by now.

 

[dnschmidt]

Most guys use a regulator or moisture filter in-between the air line and gun

That is NOT a regulator it's a "Cheater Valve" a regulator has a diaphragm in it to insure constant pressure. https://www.summitracing.com/parts/rti-mr1