Hand Crank Worm Gear Screw Jack

The Hand Crank Worm Gear Screw Jack is a purely manual lifting and positioning device that relies on a hand crank to drive the integrated worm gear and trapezoidal screw transmission pair, converting human rotary force into steady, controllable linear lifting motion. It comes with a built-in self-locking structure that firmly holds the load at any preset position without extra brake or locking mechanisms, effectively preventing accidental slipping even after the crank stops rotating. With a compact, space-saving design, it requires no external power supply to operate, supports customizable lifting strokes and multiple screw end configurations, and can be mounted in either upright or inverted orientations to fit different installation requirements. Featuring low operating noise, easy maintenance and high positioning accuracy, this jack is widely suitable for intermittent lifting tasks, equipment height adjustment, on-site maintenance operations and other scenarios where electric drive is not accessible or precise manual control is required.