... : ARNCO 100XT , 200XT, & 300XT , BOTN3000 , ARMACOR MProduct ProcessSpecial Feature Ⅰ HW Drill Pipe by welding—OD 3-1/2“to 5-1/2 ... torque capacity torque capacity increase 30% to 50% than normal API standard tool joint suitable for drilling activities of high pumping ... deep and super deep well drilling,directional and horizontal wells2.API Standard Tool JointItem: NC26, NC31 ,NC38, NC40, NC46, NC50, ...