UNE-EN 1514-6:2004 Flanges and their joints. Dimensions of gaskets for PN-designated flanges. Part 6: Covered serrated metal gaskets for use with steel flanges
2004UNE-EN 1514-6:2004 Flanges and their joints. Dimensions of gaskets for PN-designated flanges. Part 6: Covered serrated metal gaskets for use with steel flanges