Brass Flare Fittings, Application Air, Flammable Liquid, Freon, Inert Gases, Non-Combustible Gases, Non-Potable Water, Fitting Thread Size 5/8-18, Flare Angle 45 Degrees , Fitting Material Brass, Hex Size 13/16 in, Maximum Operating Pressure 2,800 psi, Maximum Operating Temperature 250 Degrees F, Overall Length 3/4 in, Specific Fitting Shape Nut, Compatible Auto Systems Adapters, Fuels, Natural Gas, Propane, Refrigerant Lines, Compatible Tube Outer Diameter 3/8 in, Standards SAE J512, SAE J513