Manufacturers & Suppliers of ASTM A182 F321H BLRF Blind Flange, 3-1/2\" ASME B16.5 Class 600# Blind Flange, ASME SA182 F321H BLRF Blind Flanges, ANSI B16.5 BLRF, DIN 1.4878 Blind Flange, Japanese JIS SUS 321H, UNS S32109 BLRF Flange, EN X12CrNiTi18-9.