... the system stiffness 4.movement is reversible high quality screw nut description:1.Screw nut bodies ... nut institutions, although the structure is complex, high manufacturing costs, not self-locking, but its ... advantage is that the frictional torque, high transmission efficiency (92% ~ 98%), high accuracy,6. the system stiffness, ... widely used in mechatronic systems. high quality cross lead screw nut