Compression Nut, Application Air, Fitting Material Brass, Maximum Operating Pressure 400 psi, Maximum Operating Temperature 250 Degrees F, Overall Length 3/4 in, Thread Size 7/16-24, Specific Fitting Shape Nut, System of Measurement Imperial, Compatible Tube Outer Diameter 1/4 in, Standards DOT FMVSS 571.106, SAE J246, Compatible Tube Material Annealed Copper, Fitting Connection Type Compression, Hex Size 9/16 in, Minimum Operating Temperature -65 Degrees F