SAJ serials pinion and cone progressive safety device is the most important safety device in the pinion and rack builder's hoist, which can prevent the cage running over speed, and effectively reduce the cage dropping accident.Rated braking load: 30KNRated braking speed: 1.2~1.6m/sStandard action speed: According to hoist rated lifting speed and user requirementsWeight: 35kg Pinion parameter: M8Z15 or M5Z20