... enough for processing the Petroleum steel pipe thread. As professional Sucker Rod,Tubing,Drill pipe machine, the BTC2085n is perfectly suitable for ... 2 , 1 1/8, 2.Recently, the dedicated thread pipe machine can be remoulded by nomalMachine, but when the main ... .2 circular arc, unload groove.1.3, Rolling friction thread; Rolling friction thread sucker rod with mist lubrication has improved the surface ...