Where can i find another A/C nut?

[Warren96]

The steel 3/8" A/C nut on the liquid refrigerant pipe on the condenser side is corroded and stripped. I plan on cutting off the nut,putting a new one on, with a "Splice-loc" line repair coupling. A new line is available, but it looks much easier and safer than running into another cranky fitting, and possibly having to replace the evaporator also. Where can i find another nut! Anybody got an extra !!!

[DmaxMaverick]

If the line measure 3/8" (0.375") O.D., you can use a 3/8" flare nut and backing sleeve (AN/MS #6). The threads should be the same. They are available in steel, aluminum and stainless steel. Use anti-seize compound or dielectric grease (tune-up or silicone) on the threads only, to prevent corrosion and future seizing.

[JohnC]

If the line measure 3/8" (0.375") O.D., you can use a 3/8" flare nut and backing sleeve (AN/MS #6). The threads should be the same.

Be careful! Aviation flares are 37 degrees whereas most automotive stuff is 45 degrees.

[DmaxMaverick]

Be careful! Aviation flares are 37 degrees whereas most automotive stuff is 45 degrees.

Correct, but it doesn't matter. The A/C fittings are O-ring sealed. All that's required is to hold it squarely in place with modest clamping force. A greater concern is using compression type fittings on the typically very soft and not-so-round A/C tubing. They are usually OK near straight ends if they haven't been damaged or bent. If the sleeve slides on, it should be fine. I don't know what aluminum is used, but it's significantly softer than aviation 5056 aluminum, and at the relatively low pressures, it doesn't present an issue.

An alternative is to replace the entire line set.