... . Standard: JIS,BS,DIN.ANSI/ASTM ,NF,API ,GOST,GB and Non standard, 4. Size:1/2"-40" ... joint flanges, Welding neck flanges, Socket welding flanges and Treaded flanges.,Square flanges. 6. Pressure ratings : ... , FM ,R.T.J ,R.J ,MALE ,FEMALE and so on . 8. Used for : petroleum,chemical,power ... Certificate :TUV 13. ISO certificate : ISO 9001:2000 and ISO 9001 :2008 14. Special equipment manufature license : ...