JACTON offers various types screw jacks, such as translating style jacks and rotating style jacks. For translating screw jacks, keyway is a common way to realize the anti-rotation for the screw jacks. In fact, there is another way, that is to use a special square tube. A square guide tube is attached to either the top or bottom of the screw jacks. A square nut is attached to the end of the lifting screw which is then fitted inside the tube, preventing rotation.