Flat Key Specifications: flat Materials: ASTM A105 A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2 A516.60 A694 (F42, F46, F48, F50, F52, F56, F60, F65, F70) A182 F304/304L, F316/316L, F316H, F310, F321 A182 F11, F22, Manufacturing standards: API, ANSI, BS, JIS, UNI, MSS and SP Pressure: 150# to 2,500# Size range: 1/2 to 56 inches (DN15 to DN1,400mm)