... :1 . Product overviewBHQK580 CNC Machine For Steel pipe (Sucker Rod,Tubing,Drill pipe) is capable enough for processing the Petroleum ... steel pipe thread. As professional Sucker Rod,Tubing,Drill pipe machine, the machine is perfectly suitable ... 2,.Rolling end face, R3.2 circular arc, unload groove.1.3, Rolling friction thread; Rolling friction thread sucker rod with mist ...