API Friction Welding Drill Pipe/Drilling Pipe 5 1/2" G105 or S135 AISI 4137h Hebei Shitan Machinery Manufacturing Co., Ltd. API Friction Welding Drill Rod 5 1/2" G105 or S135 AISI 4137h Hebei Shitan Machinery Manufacturing Co., Ltd. API 5dp Friction Welding Drill Pipe/Drilling Pipe 5 1/2" G105 or S135 AISI 4137h Hebei Shitan Machinery Manufacturing Co., Ltd. API 5dp Friction Welding Drill Rod 5 1/2" G105 or S135 AISI 4137h Hebei Shitan Machinery Manufacturing Co., Ltd. API Spec 5dp Friction Welding Drill Pipe/Drilling Pipe 5 1/2" G105 or S135 AISI 4137h Hebei Shitan Machinery Manufacturing Co., Ltd. API Friction Welding Drill Pipe/Drilling Pipe 5" G105 or S135 AISI 4137h Hebei Shitan Machinery Manufacturing Co., Ltd. API Friction Welding Drill Rod 5" G105 or S135 AISI 4137h Hebei Shitan Machinery Manufacturing Co., Ltd. API 5dp Friction Welding Drill Pipe/Drilling Pipe 5" G105 or S135 AISI 4137h Hebei Shitan Machinery Manufacturing Co., Ltd. API 5dp Friction Welding Drill Rod 5" G105 or S135 AISI 4137h Hebei Shitan Machinery Manufacturing Co., Ltd. API Spec 5dp Friction Welding Drill Pipe/Drilling Pipe 5" G105 or S135 AISI 4137h Hebei Shitan Machinery Manufacturing Co., Ltd. <<<3435363738>>>