... according to the requirements of Group 1 & Group 3 of API SPEC 5D. Specifications1.Drill Pipe 2.size ... ,X52,X56,GR.B, Q345, Q235, Q195, 20#, 10#, S235JRH, S275JOH, S355JOH,P325TR1,ST37,ST52,ST37.4,ST45 etcCertificate ... mm)(in)(mm)2 3/86.652 3/860.320.2807.11EXGSEUNC26 (2 3/8 IF)3 3/885.701 3/444.452 7/810 ... .402 7/873.020.369.19NC31 (2 7/8 ...