Flare fitting tubes

Flare fitting tubes are a type of compression fitting used with metal tubing, usually soft steel, ductile (soft) copper and aluminum, though other materials are also used.  In a flare fitting tube itself is "flared" i.e. expanded and deformed at the end. The flare is then pressed against the fitting it connects to and is secured by a close-fitting nut that ensures that no leakage happens. Tube flaring is a type of forging operation, and is usually a cold working procedure.  During assembly, a flare nut is used to secure the flared tubing's tapered end to the also tapered fitting, producing a pressure-resistant, leak-tight seal. Flared connections offer a high degree of long-term reliability and for this reason are often used in mission-critical and inaccessible locations.

The tool used to flare tubing consists of a die that grips the tube and either a mandrel or rolling cone is forced into the end of the tube to form the flare by cold working.

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