NameJetsun drill pipe PartsKelly (square kelly,hexagonal kelly),drill pipe,Drill pipe joints,Heavy Weight Drill Pipe(HWDP) Size (API)OD: 2 3/8''- 6 5/8'' Length: R1 R2 R3 Customized according to drawing or requirements MaterialE75,X95,G105,S135,SS-95,SS-105,S-135T,Z-140,V-150 and so StandardAPI 5DP Upset Ends for Weld-on Tool JointsEU, IU,IEU Drill pipe jointsMale and Female , API standard connection,SGDS connection,SGHT connection,SGET connection Connection threads style for drill toolNC(number)-API, ZF(internal-flush), FH(full hole), REG(regular) Thread type of NC(number)-APINC26,NC31,NC38,NC40,NC46 Steel gradeD,E,X,G,S ApplicationUsed in oil well drilling.It is mainly used for drilling process and after completion of borehole wall support, to ensure that the drilling process and the whole Wells after completion are normal running .