... 40T,RN-50T,RN-100T2.Function: precisely controlled lifting,lowering,pushing,pulling and rolling movements3.Self locking trapezoidal ... furnace lid lifters,Conveyor lifts,Air dampers,Theatre stages,Glass charging machines,Steel manufacturing mills,Cold/Hot ... backlash Nut Device Available.* Special Custom Design Available.Materials: * Lifting Screw: steel C45 (optional: stainless steel)* Worm Gear: ...