Need Air Line Adapter Advice

[scoostraw]

Hey guys I'm a little stumped on this one. I'm brain-storming for a project and want to use 1/4" OD steel like is on one of the adapters for my brake bleeder. On this adapter there is a Tru-Flate style air fitting. It appears to be threaded onto the 1/4" OD steel line.

My question is with regard to the fitting threaded onto the steel line. I don't seem to find one like it anywhere so I could check the thread size and pitch. Is it possibly custom made for this application?

In actuality, for the project I'm planning I would probably just want 1/4" NPT male threads instead of the quick-connect fitting. But what I'm stumped on is the other end that I could thread onto the 1/4" pipe. What are my likely options for threading onto this size pipe?

 

[Jbullfrog]

1/4" od would be close to 1/8" npt. Think grease gun hose fittings. The quick connect on your brake bleeder is considered a "fluid fitting". They are 1/8"npt thread.

 

[The Cobbler]

m style plug x 1/8 f npt here https://www.ebay.com/itm/1-4-air-qu...h=item4418ba1259:g:pLsAAOSwnDBanaSt:rk:1:pf:0

 

[scoostraw]

1/4" od would be close to 1/8" npt. Think grease gun hose fittings. The quick connect on your brake bleeder is considered a "fluid fitting". They are 1/8"npt thread.

Ok so 1/8" NPT - that helps a lot. I could use a reducer like this I think to get to 1/4" NPT.

So is the quick connect on my bleeder adapter in fact a grease fitting? I will look around in the grease world and see what I can find.

Thank you.

 

[scoostraw]

m style plug x 1/8 f npt here https://www.ebay.com/itm/1-4-air-qu...h=item4418ba1259:g:pLsAAOSwnDBanaSt:rk:1:pf:0

Thanks Cobbler.

 

[scoostraw]

That 1/4" OD line that is used on the brake adapter - could it possibly be 1/4" brake line? The wall is pretty thick on it which gives room for cutting threads.

I will eyeball some brake line on my next trip to the parts store..

 

[Dana_B]

brake line is not threaded on the inside. That is tube, not pipe and usually is flared with a tube nut.

 

[scoostraw]

brake line is not threaded on the inside. That is tube, not pipe and usually is flared with a tube nut.

The tubing on this bleeder adapter is not threaded on the inside. It is threaded on the outside. (I understand how brake line is used for its intended purpose)

I'm curious if they used brake line for this tool and threaded it on the outside. I just don't have a piece of 1/4" brake line in front of me here to compare to see if the wall thickness is the same or not.

 

[Jbullfrog]

The 1/8npt fitting on your bleeder is a fluid or hydraulic coupling. It's a size under regular air fittings.

 

[scoostraw]

The 1/8npt fitting on your bleeder is a fluid or hydraulic coupling. It's a size under regular air fittings.

Isn't 1/8" NPT bigger than that? (The tubing on my bleeder is 1/4" OD)

 

[AngularContact]

If you’re working with 1/4 OD tube and 1/4 NPT threads, Swagelok fittings would be the way to go. I’m not sure what your budget is, they’re not exactly cheap.

 

[scoostraw]

If you’re working with 1/4 OD tube and 1/4 NPT threads, Swagelok fittings would be the way to go. I’m not sure what your budget is, they’re not exactly cheap.

I have been on their site. Yes their stuff is pricey.

 

[scoostraw]

It appears that this fitting is a Plews (Amflo / Truflate) #CP12, which is .307-32" female thread.

(I am now looking for a .307-32" to 1/4" NPT adapter..)

 

[The Cobbler]

305-32 here. it's tire valve thread size https://www.ebay.com/itm/Milton-731...h=item21195a172e:g:JeQAAOSwB09YDk9F:rk:1:pf:0

 

[scoostraw]

Yes I discovered that. Apparently a Schraeder valve is .305-32" and these fittings are .307-32" to provide a leak-proof fit. And the only things I can find with such a thread are these "re-capper" fittings.

I realize now that I have to find something else. I'd like to stick with the 1/4" OD tubing but I need to find a way (without welding) to get it to 1/4" NPT.