... -locking Trapezoidal Screw,etc;3. Safely self locking, Positioning Precision, Heavy Duty, Uniform Lifting Speed, Low Efficiency, Use Infrequently, Easy Installation, Low ... ;Low ratio,1 turn shaft,0.25 mm stroke;9.Electric Motor Horsepower Range 0.03 ~ 21.5 HP;10. ... speed is 3600 mm/min11.Accessories: Bevel Gearbox,Hand Wheel,Electric Motor,Motor Flange,Frequency Inverter,Safety Nut,Steel Cover,Rubber ...