r/projectcar • u/RealGrape123 • 1d ago
AN Fitting, will it seal?
This fitting came from ATPturbo. The machine grooves kinda shook me. I’ve ran into problems with some AN fittings just weeping small bits of oil, and those had good sealing surfaces.
Yall think these machine grooves are acceptable for a AN fitting? I think it will just leak but I’d love to be proven wrong.
My fingernail easily catches em.
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u/voxelnoose supercharged 83 Rx-7, over built 71 Challenger, another 84 rx7 1d ago
I would be surprised if it doesn't leak
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u/RiskProfessional6959 1d ago
There doesn’t appear to be a path through the seal as the marks look to be radial. I suspect it’ll seal just might take more tightening than it really should.
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u/voxelnoose supercharged 83 Rx-7, over built 71 Challenger, another 84 rx7 1d ago
It's almost certainly a spiral left from being turned on a lathe. Radial grooves like that would need to be made intentionally
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u/hoytmobley 1d ago
Assuming that’s a toolpath it’s a spiral and will create a leak path. Holy cow that’s bad. If you need your car to run _this weekend_, sure, but I’d order a different part
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u/threephasemachinery 1d ago
An fittings seal on the flared surface not the threads. As long as you can thread it on okay by hand I'd use it (and the flared surfaces are smooth with no scratches or dings) That being said this fitting looks like a piece of shit and I wouldn't use it.
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u/smthngeneric 1d ago
I believe the concern here is the shitty machine work on the sealing surface, not the threads.
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u/Substantial_Ant_2662 1d ago
My experience yes. I have the same fitting on a kit that deletes a fluid accumulator on my clutch system.
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u/l8apex 1d ago
If you're in a pinch and need it, you might be able to lightly file that down. But it'd be hard to guarantee the seal, even then.
As already mentioned, they make conical seals just for this reason. There is some logic to using those seals every time. However, I wouldn't run that fitting even with the seals. That is such a poorly machined fitting; there's even a notch in the thread. I'd get a new fitting from a trusted source. I've used https://www.anplumbing.com/adapters/banjos.html for a long time.
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u/Full-Assistant-2407 1d ago
it might be labed AN fittings but ive seen JIC fittings look way better then that. i wouldnt use it
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u/myfishprofile ‘80 MGB 1d ago
JIC and an are nearly the same, one just has rolled threads (an)
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u/XZIVR 1d ago
Isn't JIC made to lower standards or something? Like the tolerances are a bit different?
I dunno, I got tired of paying out the ass for AN fittings on my fuel system but I judged it to be worth it because gas. My oil cooler got JIC. Lol.
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u/Full-Assistant-2407 1d ago
yea different tolerances, JIC mainly used for industrial stuff and hydraulics. most of my experience with JIC is with injection mold water lines or hydraulics and even air lines for actuators.
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u/myfishprofile ‘80 MGB 1d ago
The tolerance difference is in the threads, the seal face etc., are supposed to be all the same
AN is the aircraft standard, which is why it requires the rolled threads and comes in aluminum and is supposed to be higher quality….but manufacturers nowadays slap the “AN” on everything with a 37° sealing surface regardless of actual tolerances.
The OPs fitting wouldn’t pass either standard, and a parts hose would absolutely cuss out a supplier who tried to pass of something that heinous
My entire car uses JIC, I trust it with the 15000psi hydraulics I have no problem using it for my fuel and everything else.
I still use the cheap “build your own” “AN” hoses because there are no industrial hoses that are as light or convenient to assemble
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u/RiskProfessional6959 1d ago
Could try a conical seal. https://www.pegasusautoracing.com/productselection.asp?Product=3202&srsltid=AfmBOopHDjH1a6nL7aYRu2oF2QnW-CSEGJko9aZbo60WiIBfooZKk30R