Stainless Steel Socket Weld Flange: Stainless Steel Socket Weld Flange, MSS SP-44, Raised Face, EN 1901, 1500LB (PN250), 1/2-56 Inch (DN15-DN1400). Name: Stainless Steel Flange. Type: Socket Weld Flange. Materials: Stainless Steel. Face: Raised Face. Standards: MSS SP-44, EN 1901. Pressure: Class 1500 (PN250). Size: 1/2-56 Inch (DN15-DN1400).