... tons 3. Self-lock trapezoidal screws RN-Series Translating Screw Jack Features: ModelRN-0.5T, 1T, 2T, ... ~ 26 tonsTravel Stroke10 ~ 6000MMScrew TypeTranslating Screw, Keyed Screw, Rotating ScrewConfigurationsSelf-Locking Trapezoidal Screw, Worm Gear, Worm Shaft, Taper Roll ... , Bevel Gearbox, Swivel Plate etc.RN-Series Translating Screw Jack Material: Lifting Screwsteel C45 (optional: stainless steel ...