Worm gear screw jack/acme screw jack/trapezoidal screw jack systems are ruggedly designed and produced in standard models with load handling capacities from 1/4 ton to 100 tons. They might just be used individually or in multiple arrangements. There are no standard travel lengths and all worm gear screw jack systems are built to specification. Worm gear screw jack incorporates an alloy A steel worm that powers a robust bronze worm gear drive sleeve. The worm The shaft is reinforced on antifriction tapered roller bearings featuring external seals designed to guard against the loss of lubrication sealed radial bearings on the mj, 1/4, 1/2, And 1 ton units . The drive sleeve receives adequate support on antifriction thrust bearings featuring tapered rollers or balls bearings. Turning of the drive sleeve causes the lifting screw to translate or rotate, Depending upon jack configuration.