Bulkhead Locknut Application Air Natural Gas Non-Potable Water Fitting Material Brass Maximum Operating Pressure 3 600 psi Maximum Operating Temperature 400 Degrees F Overall Length 3/16 in Thread Size 5/16-20 Specific Fitting Shape Bulkhead Locknut System of Measurement Imperial Compatible Fitting Brands Swagelok Standards ASTM 31.3 Fitting Connection Type Compression Hex Size 1/2 in Minimum Operating Temperature 40 Degrees F