Instrumentation Fittings Fitting Material Stainless Steel Material Grade 316 Maximum Operating Pressure 10 135 psi Maximum Operating Temperature 100 Degrees F Specific Fitting Shape Back Ferrule System of Measurement Imperial Compatible Fitting Brands Parker A-LOK Swagelok Compatible Tube Outer Diameter 1/4 in Series Brennan Instrumentation Standards ASME B31.3-2002 ASTM A213 ASTM A269 Compatible Fitting Connection Type Compression Compatible Tube Hardness 90 HRB