Flare fitting

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Flare Fittings are a type of compression fitting used with metal tubing, usually copper, though other materials are also used.

The male half of the fitting has a straight thread and an angled front face (usually 45° or 37°). A matching nut is placed on the tubing, and a flare tool is used to flare the end of the tubing outward at the same angle. The nut is then tightened, compressing the flared portion of the tubing between the male fitting and the nut.

There are several styles of flare fitting available, including the 45° SAE style (available at many hardware stores, and very commonly used), the 37° AN style, and JIC.

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