... We can supply various standard and material flanges FLANGE:WELDING NECK ,SLIP ON ,BLIND ,PLATE,THREADED,LAPPED ,SCREWDE,SOCKET WELDING PRESSURE ... :1)GOST 12820:PLATE FLANGEGOST 12821 :WELDING NECK FLANGE2)ANSI B 16.5 :WELDING NECK ,SLIP ON ,THREADED,LAP JOINT,SOCKET WELDING ... ,BLIND ,NO PLATE FLANGE 3)DIN :PLATE,WELDING NECK ,BLIND ,SCREWED,LAPPED4) EN1092 ,BS 4504:SLIP ON ,WELDING ...