UCR Female Nut Metal Face Seal fittings- Metal Gasket Face Seal FittingsPart No.UCR SizeDimension (mm)MinchAEFF-CFN-04-1/420.509.0019.59/16-18UNFF-CFN-08-1/222.5015.3026.987/8-14UNFF-CFN-12-3/428.4022.6038.101 1/4-18UNFF-CFN-16-134.0030.5046.04 1/2-20UNF