API 5dp Friction Welding Drill Pipe O. D. 127mm Ieu G/S AISI 4137h Hebei Shitan Machinery Manufacturing Co., Ltd. API Spec 5dp Oil Drill Pipe O. D. 127mm Ieu G/S AISI 4137h Hebei Shitan Machinery Manufacturing Co., Ltd. API Spec 5dp Friction Welding Drill Pipe O. D. 127mm Ieu G/S AISI 4137h Hebei Shitan Machinery Manufacturing Co., Ltd. API Oil Drill Pipe O. D. 114.3mm Ieu G/S AISI 4137h Hebei Shitan Machinery Manufacturing Co., Ltd. API Drill Pipe O. D. 114.3mm Ieu G/S AISI 4137h Hebei Shitan Machinery Manufacturing Co., Ltd. API Oil Drill Pipe O. D. 101.6mm Iu G/S AISI 4137h Hebei Shitan Machinery Manufacturing Co., Ltd. API Drill Pipe O. D. 101.6mm Iu G/S AISI 4137h Hebei Shitan Machinery Manufacturing Co., Ltd. API 5dp Oil Drill Pipe O. D. 88.9mm EU G/S AISI 4137h Hebei Shitan Machinery Manufacturing Co., Ltd. API 5dp Friction Welding Drill Pipe O. D. 88.9mm EU G/S AISI 4137h Hebei Shitan Machinery Manufacturing Co., Ltd. API Spec 5dp Oil Drill Pipe O. D. 88.9mm EU G/S AISI 4137h Hebei Shitan Machinery Manufacturing Co., Ltd. <<<3031323334>>>