When Work Screw rotation must be prevented, the Jacks can be realized with keyway along the Work Screw, a matching key is fastened to the cover of the Jack which will eliminate Work Screw rotation.
This design is only available for translating screw jacks .If the structure/object connected to the lead screw is not prevented from rotating or the lead screw is not always in contact with the structure then a screw jack with an “Anti-Rotation” mechanism (keyed) should be used. For machine screw jacks the mechanism uses an internal key to prevent the lead screw from rotating.
Anti-rotation device is suggested for limited strokes and low speed.The Anti-rotation device causes greater than normal wear on the Work Screw, somewhat reducing Jack life.
