API 5B Tubing and casing thread Standard: ASTM,JIS,EN,ISO, ... .: 2mm-200mm API 5B Threading, gaging and thread inspection of casing, tubing and line pipe thread ASTM A519 50B40 50B44 ... ,SCM430TK, SCM435TK,SCM440TKJIS G3444 STK 30, STK 41, STK 50, STK 51,STK 55JIS G3445 STKM11A, STKM12A, STKM12B,STKM12C ... IF ANY INQUIRY! API 5B Threading, gaging and thread inspection of casing, tubing and line pipe thread