... :such as 201, 301 ,304,304L,316,316L,321 and so on. 3. Standard: JIS,BS,DIN.ANSI/ASTM ,NF,API ... 10 16 25 40 64 and 160,5K-40K and so on . 7. Sealing surface : FF ,RF, LJ, FM ,R.T ... .J ,R.J ,MALE ,FEMALE and so on . 8. Used for : petroleum,chemical,power,gas,water,linepipe ...