... load 26 tons Self-lock trapezoidal screws jack (lifting) detailed information:1.Model:RN-0.5T,RN-1T,RN-2T,RN- ... RN-40T,RN-50T,RN-100T2.Function: precisely controlled lifting,lowering,pushing,pulling and rolling movements3.Self locking trapezoidal ... Anti-backlash Nut Device Available.* Special Custom Design Available.Materials: * Lifting Screw: steel C45 (optional: stainless steel)* Worm Gear: phosphor ...