... 4" ,4 1/2", 5", 5 1/2" ,6 5/82.Steel grade: E75,X95,G105,S135 3.Certificates : API 5DP,NS-1 4 ... . Length: R1: 5.3-7. ... 9m R2: 8.5-11.5m R3:11.5-14.5m 5.Internal ... capacity torque capacity increase 30% to 50% than normal API standard tool joint suitable for drilling activities of high pumping ...