... 40T,RN-50T,RN-100T2.Function: precisely controlled lifting,lowering,pushing,pulling and rolling movements3.Self locking ... Hot rolling mills,All tube mills.Accessories: Protective Tube, Rubber Bellows, Electric Motor, Hand Wheel, Inverter, Limited Switches, ... backlash Nut Device Available.* Special Custom Design Available.Materials: * Lifting Screw: steel C45 (optional: stainless steel)* Worm Gear: ...