A  screw jack set is a mechanical lifting system that uses threaded screws to convert rotary motion into linear motion, allowing heavy loads to be lifted, lowered, or precisely positioned.

Core principle: A screw jack (also called a jackscrew) works by turning a threaded spindle with a handle, crank, or motor. As the spindle rotates, a nut or load platform moves up or down along the threads, creating controlled vertical or horizontal movement.

Set configuration: A screw jack set usually includes multiple screw jacks connected by shafts, couplings, or gearboxes, enabling synchronized lifting of large or uneven loads.

Applications: Common in construction, automotive repair, manufacturing, and aerospace, where precise positioning and heavy lifting are required