AN fittings and copper tubing

[Quickstep192]

I’m working on a project where I need to connect a 3/8” copper tube to a 6AN connector.

Can I simply flare the copper tube and use an AN nut to connect to the AN connector? Both copper flares and AN flares are 30 degrees, right?

[kamaro]

you need a sleeve and a flare nut, and a 37* flaring tool, here is a pic :

https://www.kartek.com/mm5/graphics/00000001/37-degree-flare-on-an-fitting-for-hard-line-tubing.jpg

[kamaro]

you need a sleeve and a flare nut, and a 37* flaring tool, here is a pic :

[Andy Somogyi]

I’d really try to avoid copper on automotive applications. Copper work hardens with vibration, and becomes brittle. It will crack eventually.

I’d recommend using steel or brass, or even aluminum.


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[roblav]

Agree with Andy above... copper gets brittle.

[dannobee]

Or just buy the proper sized Swagelok fitting off of ebay.

I agree with the no copper. If it vibrates at all, it'll work harden. Stainless or aluminum tubing instead. Steel usually uses a 45 deg double flare connection with a different style B-nut. Or the Voss style connection if you want it period correct.

[Quickstep192]

Thanks, guys for the sage advice on the work hardening. This particular project isn't for the car, I'm building an aftercooler for my compressor, so you advice is doubly important. There's a ton of vibration in a compressor.