Ferrule, Finish/Coating Colorless Dry Lubricant, Fitting Material Stainless Steel, Material Grade 316, Maximum Operating Temperature 1,200 Degrees F, Specific Fitting Shape Ferrule, Compatible Fitting Brands Swagelok, Compatible Tube Outer Diameter 1/4 in, Series CPI(TM), Standards ASME SA-479, ASTM A276 Type 316, BS970 316-S31, DIN 4401, Compatible Fitting Connection Type Compression, Minimum Operating Temperature 425 Degrees F