Double Ferrule Nut Application Air Natural Gas Non-Potable Water Fitting Material Brass Maximum Operating Temperature 400 Degrees F Overall Length 1/2 in Thread Size 7/16-20 Specific Fitting Shape Double Ferrule Nut System of Measurement Imperial Compatible Tube Outer Diameter 1/4 in Compatible Fitting Brands Swagelok Series A-LOK(R) Standards ASTM B16 Alloy 360 ASTM B453 Alloy 345 CA-345 CA-360 QQ-B 626 Alloy 360 Fitting Connection Type Compression Hex Size 9/16 in