... /6 to 21-1/4 2.Welding Neck,Loose,Flat,Blind.Threaded Flange 3.2000psi-15000psi 4.API6A Type B Flange ... Size1/2"-72"TypeWeld Neck, Slip-On, Blind, Socket Weld, Lap Joint, Threaded, Orifice Flange, Swivel Flange, Spectacle ... Blind,Etc.StandardANSI, ASME ,MSS, API, DIN, JIS, BS. AWWA and ...