Slip-on, Welding Neck, Blind, Threades, Lap-joint, Socket welding,flange Steel Flanges Fittings The main flange products of our company include: ... Welding-neck flanges, Slip-on flanges, Blind flanges, ... -605, AWWA-c207, MSS-sp44;b)Kinds of flange:Slip-on, Welding Neck, Blind, Threades, Lap-joint, Socket welding;c) ...