320-120-000 - 12" Raised Face Weld Forged Carbon Steel Neck Flange - 300 lb DomeAllied 320 120 000 Raised Face Weld Neck Flange, 12" Forged Carbon Steel, 300 lb, Dome The Allied 320 120 000 Weld Neck Flange is designed for high strength, leak resistant connections in piping systems where durability and reliability are critical. Manufactured from forged carbon steel, this flange features a raised face for improved gasket sealing and a weld neck design that provides reinforcement under high pressure and temperature conditions.