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Resolved OFH AN Fittings

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spyderdrifter

spyderdrifter

10+ Year Contributor
5,268
711
Jul 11, 2009
Somewhere in, Colorado
Forgive the noob question, but should AN fittings in this location have o-rings or crush washers like pictured? No idea why these are here, but thought there should be o-rings.

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spyderdrifter said:
Forgive the noob question, but should AN fittings in this location have o-rings or crush washers like pictured? No idea why these are here, but thought there should be o-rings.

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Click to expand...
Like Paul mentioned above, those are originally banjo bolts with bonded seal washers. So normally when you go with AN fittings, you use crush washers.
 
99gst_racer said:
Tapered thread seals by the slight deformation of the thread, so no washer or o-ring needed on those.
Click to expand...
Agree with what you said. but sorry totally no offence, that port has M16x1.5 straight thread and the fitting is a AN to metric, so I think it should have a crush washer.
 
pauleyman said:
I haven't used one of those housings in a long time. I thought the bspt was on the sensors? Aren't those banjos originally?
Click to expand...
DSMPT said:
Agree with what you said. but sorry totally no offence, that port has M16x1.5 straight thread and the fitting is a AN to metric, so I think it should have a crush washer.
Click to expand...
Sorry guys, I was thinking those were BSPT ports. It's been a LONG time since I plumbed one of those. Thanks for the correction. I'll remove my original post as to not spread any misinformation.
 
So since they were originally banjo bolts with the washers, should I continue using the washers or would I be ok swapping to o-rings? Same question for th fuel rail. I jut got a JMFab rail, and received my fittings today that screw into the ends. O-ring or crush washer? I'm new to the AN hardware sonI want to do this properly the first time.
 
spyderdrifter said:
So since they were originally banjo bolts with the washers, should I continue using the washers or would I be ok swapping to o-rings? Same question for th fuel rail. I jut got a JMFab rail, and received my fittings today that screw into the ends. O-ring or crush washer? I'm new to the AN hardware sonI want to do this properly the first time.
Click to expand...
Go with crush washers for the oil cooler fittings. If you use o-rings for that, you would possibly break-off the o-rings when you tighten the fittings.
As for the fuel rail, I don't know what thread the JMF rail has but I assume it's ORB. If so, you need to use a o-ring between the rail and the fitting.
 
DSMPT said:
Go with crush washers for the oil cooler fittings. If you use o-rings for that, you would possibly break-off the o-rings when you tighten the fittings.
As for the fuel rail, I don't know what thread the JMF rail has but I assume it's ORB. If so, you need to use a o-ring between the rail and the fitting.
Click to expand...
Thank you. Thanks to all of you.
 
Last edited:
Recessed ports are ORB's or o ring boss and flat surfaces are for crush washers with alloy or copper.
 
ec17pse said:
Recessed ports are ORB's or o ring boss and flat surfaces are for crush washers with alloy or copper.
Click to expand...
This.
The component the crush washer or o-ring is attempting to mate to should be designed with the crush washer or o-ring in mind. You shouldn't really try to seal with an o-ring unless there's provision for that o-ring on the mating side.
 
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