Weld Neck Key Specifications: Weld Neck Materials: A105, LF2, F304, F304L, F316, F316L and Q235 Weld Neck Manufacturing standards: API, ANSI, BS, JIS, UNI, MSS and SP Weld Neck Pressure: 150# to 2,500# Weld Neck Size range: 1/2 to 56 inches (DN15 to DN1,400mm)