... From1/8" to 64" 3,Standard: BS,DIN etc Socket-welding flange Production standard: GB/T9112~9124-2000 JB/T81 ... -96 GB/T2506-2005 GB10745-89 GBT4450-95 HG/T 21514~21535-2005 GD2000 GD87 ASME B16.5 ASME ... WPBTypes: Welding Neck Flanges, Slip on Flanges, Threaded Flanges, Socket Welding Flanges, Blind Flanges, Orifice Flanges, Lap Joint Flanges, ... RJ PJ/SE LF/SE 2,FF RF M FM T G RJ(RTJ)SIZE: 1/2” NB TO 48 ...