A Screw Joint allows both relative rotation as well as relative translation of one body with respect to another body in the z-axis direction of the base marker. The z-axis of the base marker must be parallel to the z-axis of the action marker and must pass through the position of the joint markers. A Screw Joint restricts two translational and two rotational DOFs. Additionally, translational displacement is coupled to the rotational angle by a pitch. The pitch is the distance from one peak on the thread of the screw to the next thread.