... steel 5)SO,WN,SW,PL.BL,TH socket weld flange for oil Size1/2"-160"TypeWeld Neck flange ... (WN),Slip-On flange(SO),Blind flange(BL),Socket Weld flange SW), Plate flange(PL),Threaded flange (TH), ... SLIP-ON FLANGE, BLIND FLANGE,HIGH HUB BLIND FLANGE,,SOCKET WELD FLANGE.LAPJOINT FLANGE, THREADED FLANGE. RING TYPE JOINT FLANGE. ... SSAW),seamless steel pipe (SMLS) ,and LSAW pipe! socket weld flange for oil