... ,JIS,BS,DIN.ANSI/ASTM /API,NF,GOST,EN,ISO and Non standard,4. Size:1/2"-48 ... flanges, Spectacle flanges,TG flanges,Socket welding flanges and Threaded flanges,Square flanges.6. Pressure ratings :class ... FF ,RF, LJ, FM ,RTJ,RJ ,MALE ,FEMALE and so on .8. Used for : petroleum,chemical,power,gas ... of China.19. Our objective:Survival by quality and development by credibility,quality first,customer upmost !20. ...