... Type: Plate Flange, Flat Flange, Slip-on Flange,flat welding flange,Welding Neck Flange, Long Welding Neck Flange, Blind Flange, Socket Welding Flange, Thread Flange, Screwed Flange, Lap Joint Flange ... F310,F321,etc (4) Connection Type: Raised Face, Flat Face, Ring Type Joint, Lap-Joint Face, Large Male ... Pallet or Case (7) Usage: flat welding flange are used in petroleum/ chemical industry/power/ ship ...