ZZB-1000DC intelligent single-axle of tightening machine is a special tool to tighten the SFT cylinder folding head bolts of spring plank both in the K4,K5 bogie. This machine is precise and has steady performance, meanwhile could be manipulated easily. The tightening torque could be displayed and as demand inquired printed out. Equipped with network communication connector which accomplish a good interface between operator and machine.