API 5B Tubing and casing thread Standard: ASTM,JIS,EN,ISO,BS,GOST,API ... W.T.: 2mm-200mm API 5B Threading, gaging and thread inspection of casing, tubing and line pipe thread ASTM A519 50B40 50B44 50B46 ... TO CONTACT US IF ANY INQUIRY! API 5B Threading, gaging and thread inspection of casing, tubing and line pipe thread