... , Worm Shaft, Taper Roll Bearings, Seals, Housing, Self-locking Trapezoidal Screw,etc.* Model: RN-0.5ton, RN-1 ton, RN-2 ... ,Rolling.* Manual Operation and Electrical Operation are available.* Multiple Screw Jack Systems are availbale and fully synchronized.* Absolutely irreversible, ... Horsepower Range 0.03 ~ 21.5 HP.* Trapezoidal Screw Diameters Range 20 ~100 mm;Screw Pitch Range 5 ~ 16 mm.* Max Linear ...