... EN,ISO,BS,GOST,API O.D.: 5mm-1500mm W.T.: 2mm-200mm API 5B Threading, gaging and thread ... JIS G3429 JIS 3445...DIN 1630 DIN 17175...API 5CT OCTG seriesCasing:K55 M65 N80-1 N80Q ... 8MoB5-4,14MoV6-3, 10CrMo5-5, 13CrMo4-5,10CrMo9-10, 11CrMo9-10,25CrMo4, 20CrMoV13-5-5,15NiCuMoNb5-6-4, X11CrMo5+1 ... NOT HESITATE TO CONTACT US IF ANY INQUIRY! API 5B Threading, gaging and thread inspection of casing, tubing ...