Flare Nut for rare Unloader valve needed

[Motofixxer]

So it appears to be around an M10 flare. It's smaller than 1/4" flare but larger than 3/16" flare. The outside of threads measures 10.36mm.

It's an an ALL Power APC4005 Twin stack air compressor. I believe also sold under Sears, Lowes, Strikeforce and others somewhere around early 2000's or so. They don't sell compressors anymore and only a few random parts left from later models.

I need to add the unloader line from this valve up to the switch since it's not there anymore. I bought the thing for a whole $10...but guy didn't know much about it. Thought if ya put a cap on there it would fill. He stuck his finger over it and it started filling. The pressure switch end seems to be a fairly common M10-1.0 inverted flare that I can work with.

The problem seems to be nobody has an M10 flare nut that would fit it. So looking for options that might work for it.

This is actually kind of a nice design unit with wheels and a moving handle. Otherwise it's nothing special but decent output at 4.2CFM @90

 

[KnurledNut]

Should be M10. How’s it not fitting? Too big? Too small? Not threading?

 

[The Cobbler]

I ran into that a few years back and I ended up replacing the check valve & nut

 

[RTM]

Should be M10. How’s it not fitting? Too big? Too small? Not threading?

From here the threads look fouled up, maybe try a chasing file?

 

[Motofixxer]

Should be M10. How’s it not fitting? Too big? Too small? Not threading?

I did indicate M10- flare nut doesn't seem to exist in the US. 1/4" flare is too big, 3/16" flare is too small. I tried an AI that says it's a compression fitting just not common used in US. But supposedly a 1/4" compression nut is nearly identical to M10 and often mistaken

 

[Motofixxer]

From here the threads look fouled up, maybe try a chasing file?

Problem is finding a fitting that fits it...I have nothing for it. Can't seem to find an M10 flare anywhere. I'm gonna try to buy some M10 nuts and see if they fit right. Some info says it's an import valve sold in bulk to manufacturers. Not common otherwise, others say it's just standard 1/4" compression and threads are nearly identical to M10

 

[Motofixxer]

I ran into that a few years back and I ended up replacing the check valve & nut

That is a last resort, I was hoping simple and cheap. Otherwise maybe a hydraulic shop has an adapter or nut

 

[Motofixxer]

Error

 

[RoninB4]

Not common otherwise, others say it's just standard 1/4" compression and threads are nearly identical to M10

-Thread pitch (TPI) is real important, better identify the pitch before attempting a fit. Several inch-to-metric threads fit ok for the first couple of threads but the difference shows up (tighter) after a few threads. Compression angle of the fitting can/will make a difference too as you're probably aware. I'll bet @andyvh1959 could offer better info than I can.

 

[Motofixxer]

-Thread pitch (TPI) is real important, better identify the pitch before attempting a fit. Several inch-to-metric threads fit ok for the first couple of threads but the difference shows up (tighter) after a few threads. Compression angle of the fitting can/will make a difference too as you're probably aware. I'll bet @andyvh1959 could offer better info than I can.

Yea I'm familiar enough with threads and pitches...just trying to find the right fitting. I found a reference that said that fitting is a 1/4" compression just kinda unusual style with a cone and it's 1/4" compression threads which are so close to M10 they're frequently mistaken.

 

[RTM]

Problem is finding a fitting that fits it...I have nothing for it. Can't seem to find an M10 flare anywhere. I'm gonna try to buy some M10 nuts and see if they fit right. Some info says it's an import valve sold in bulk to manufacturers. Not common otherwise, others say it's just standard 1/4" compression and threads are nearly identical to M10

Boy, what a *****. When I search for m10 flare nut, it shows me what you have. When I look for flare ferrule, shows me mostly the same things. What’s the term for the mating female piece?

Google AI says it should be an M10-1.0, so if you have a metric pitch gauge, I’d verify that before going too crazy.

Good luck.

 

[Firstram]

Is it big enough to tap 1/8 NPT? You could step up from there.