A stop nut is an internally threaded fastener that possesses locking capabilities either by itself or in concert with another component. By design, lock nuts are engineered to resist loosening when subjected to vibration or torque.
The Anti-Disengagement Bushing is a safety device preventing the translating trapezoidal screw from disengaging from the Screw Jack in the event of an accidental overstroke. The AntiDisengagement Bushing features a trapezoidal thread which guarantees the full load support during the attempted overstroke.