Need help with a compressor coupling

[RickyPetite]

Hopefully a really simple question. I have a compressor that runs a ½ impact gun. The coupler that connects the hose to the impact gun broke. I measured its inner diameter and it is ½ inch. With this in mind, I ordered:

Milton S1815 G-Style Coupler - 1/2" NPT Female

I received the item today and it is too big. The inner diameter seems to be ¾” which I find confusing. I have attached images. Any help in determining the correct part would be appreciated. Thx

 

[The Cobbler]

so you're dealing with pipe size & that is a nominal ID dimension. unlike bolts and nuts.
1/2" id on the,male would be 3/8 IPS . You probably have an "M" style coupler. snap a pic of the male plug

 

[PelicanPines]

Ricky... so you know... you are not alone. Pipe measurements are different. I keep a chart with "measured size" and "Named size" for just such situations.

I got burned when I was restoring an antique floor lamp with a busted "Flange"... kept asking for the measured size... and getting something WTF... the lamp now sits restored in my nieces house...

 

[Walkers]

What he said.

Most common air tools have a 1/4”NPT female for the inlet.

 

[RickyPetite]

Thanks for the sympathy and quick replies. See attached images

 

[RickyPetite]

Another image

 

[The Cobbler]

I mistyped above. 1/2 od would be 1/4 IPS actually it is 0.533
and you have an M style couple there
so you want 1/4 female coupler in M Style . very common

 

[RickyPetite]

Awesome. Thx. BTW, if anyone wants the coupler I bought, PM me and I'll mail it to you. Hate to see things go to waste.

 

[CraigStu]

I just did this last week. I have always had trouble figuring out which of the several types of QC couplers I had so I took a male fitting to the store with me and bought one that fit it.

 

[FMB4]

Yep, the whole threaded black gas pipe, cast galvanized, and PVC stuff can be a hassle. I worked the plumbing section in a hardware store yrs ago and we were forever having to tell customers that the best thing was to bring at least part of what they were working with into the store (4 a match up).

 

[RickyPetite]

Thx guys. Back in business!