... the form of multi-input high reliability Worm Screw Jack:(speed reducer,reducer ,gearbox,gesr units) 1. Model: JF ... , 30T, 40T, 50T, 100T 2. Configuration: Worm and worm gear, bearing, housing and lead screw 3. Function: Elevating, Lowering, ... Characteristic: Positioning precision, Safely self-locking, Heavy duty, Uniform lifting speed, small sizes, easy installation, low noise, long life, security ...