Drill Pipe 1.OD:3 1/2,4",4 1/2",5",5 1/2" ... 2.Steel grade: E75,X95,G105,S135 3.MOQ:25 tons 4.Certificates : API 5DP,API7-1 Main ... are determined according to the requirements of Group 1 & Group 3 of API SPEC 5D. C. Drill pipe joints at the ... 6% of that of bare tool joint, which can prolong 3 times of the tool joint service life C. Good property of ...