Brass Flare nuts and fittings are a type of compression fitting used with metal tubing, though other materials are also used. Tube flaring is considered to be a type of forging operation and is usually a cold working procedure. During assembly, a flare nut is used to secure the flared tubes tapered end to the also tapered fitting, producing a pressure-resistant, leak-tight seal. The most common flare fitting standards in use today are the 45-degree SAE style, and the 37-degree AN style, also used with the JIC system. The AN/JIC style generally has a higher pressure rating for a given size tubing.
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