What are these hydraulic fittings called

[BeezFun]

The o-ring was supposed to allow the JIC flare to handle higher pressures.

Interesting, I think of an oring in the context of a spool valve where the primary seal is metal to metal and the oring just catches the bit that leaks past. My system is relieved at 2900psi.

 

[DarkBlack]

I found this fitting guide from discount hydraulic hose, very helpful. It shows what I have is JIC 37deg which is the same as SAE J514. I have a thread gauge so I'm able to confirm what I have. I found a thread where they talk about these fittings with the oring, I guess it fell out of favor for whatever reason. So I think I'll just order the hose with JIC fittings and assume it will work.

Your hose in your photos look a bit unusual because it looks like you have the male style mating surface, combined with a female threaded retaining nut, instead of the usual male thread that goes with the male fittings.

 

[BeezFun]

Your hose in your photos look a bit unusual because it looks like you have the male style mating surface, combined with a female threaded retaining nut, instead of the usual male thread that goes with the male fittings.

You're right, now I'm back to confused. It actually looks more like the SAE J514 Flareless compression, which is what @MAX-24-Dean said in the first response.

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[ptsg]

Can you measure the Outer diameter of the tube and the inner diameter of the threads? Preferably in millimeters. It's screaming DIN 2353 fitting to me.

 

[Bavarian]

It's a metric fitting.
Check the backside of the collar nut. You may find the size.
From the looks, it could be 10S or 12S.

Measuring the tip of the fitting in front of the O-ring will give you the size.

 

[Bavarian]

I zoomed in a bit closer in your first picture.

The tip seems to be about 3/8" which equals 10mm.
It's a 10S.
30 years ago, we called that fitting DKOS 10S.

 

[BeezFun]

I zoomed in a bit closer in your first picture.

The tip seems to be about 3/8" which equals 10mm.
It's a 10S.
30 years ago, we called that fitting DKOS 10S.

I measured the largest diameter of the tip in the first photo, it's 11mm, the smallest diameter right in front of the oring is 6.5mm. The OD of the tube is 7.7mm. The ID of the threads is 11.5mm. The nuts take a 19mm wrench.
It's harder than I thought to measure anything else because I can't get my measuring scale on the threads on the machine because it's too tight a spot. I think I'm ready to to surrender and just drive to the closest hydraulic place.

 

[LouNY]

Is the fitting in the machine removable? May be easy to get both fittings and a hose.

 

[Bavarian]

I measured the largest diameter of the tip in the first photo, it's 11mm, the smallest diameter right in front of the oring is 6.5mm. The OD of the tube is 7.7mm. The ID of the threads is 11.5mm. The nuts take a 19mm wrench.
It's harder than I thought to measure anything else because I can't get my measuring scale on the threads on the machine because it's too tight a spot. I think I'm ready to to surrender and just drive to the closest hydraulic place.

That sounds like 8S.

 

[9will1979]

It’s BSP, look it up and compare your specs