ZZB-150DA Intelligent combination of tightening machine is a special tool to tighten the gearbox, which are produced in the bridge-box factory, China National Heavy Truck Corp. 5 bolts can be tightened equably at one operation. Being precise and having steady performance, the tightener is manipulated agilely. Can be demanded and printed out. Equipped with a network message interface, the tightener has a friendly man-machine interface.