... Motions. Worm Gear Drive Screw Jack Accessories: Protective Tube, Rubber Bellows, Electric Motor, Hand Wheel, Inverter, Limited ... Switches, Linking Shaft, Coupling, Pillow Block Bearing, Counter, Bevel Gearbox, Swivel Plate and Trunnion Base. Worm Gear ... Nut Device Available. * Special Custom Design Available.Worm Gear Drive Screw Jack Materials: * Lifting Screw: steel C45 ...