Nut Application Air Natural Gas Non-Potable Water Steam Finish/Coating Zinc Plated Fitting Material Steel Maximum Operating Pressure 8 000 psi Maximum Operating Temperature 800 Degrees F Overall Length 1/2 in Thread Size 7/16-20 Specific Fitting Shape Nut System of Measurement Imperial Compatible Tube Outer Diameter 1/4 in Compatible Fitting Brands Swagelok Series A-LOK(R) Standards ASTM A108 QQ-S 637 Fitting Connection Type Compression Hex Size 9/16 in