Screw jack 3.2 tons -100 tons. The application range of screw jack is relatively wide, and a large number of screw jacks are needed when the beam frame needs to be lifted and supported for a long time in the early stage of automobile maintenance or bridge construction, or there are many applications in industry. Screw jack belongs to a kind of hoisting machinery. According to the principle of screw transmission, the screw pair composed of screw and nut is used to realize transmission. Convert rotary motion into linear motion and transmit motion and power. So as to lift the object to a certain height. It is a simple lifting equipment with a height less than 1 meter. It has the advantages of compact structure, uniform and stable rotation and easy self-locking.