Screw Jack System Accessories: A complete line of motors, motor adaptors, limit switches, worm gear reducers, mitre gear boxes, couplers, shafting, screw end adapters, pillow blocks, electrical controls and boots. We can provide the accessories you need to compliment your screw jack system and to ensure the efficient operation, extended life and safety of your system. Traveling nuts rotating screw type screw jacks lifting work platform is exported to Vietnam customer. The systems include 4units 5-ton travel nut lifting jacks, 3units 25mm shaft gearbox, couplings, connecting bars and motor.