These worm gear screw jacks are very precision and reliability, it could meet all of the necessary basic safety, cost-efficiency, and toughness mandates of the application. High Worm Gear Jack strength bronze worm gear can be used, the payloads from 0.5T to 100T . A complete of 11 sizes can be found, each in a traveling nut version and a basic version.
Worm equipment drive screw jack
Translating(traveling screw) and rotating (traveling nut) configurations
Electric Driven and Manual Operated both are available
Trapezoidal spindle (self-locking) and Ball Screw spindle (high efficiency) version
Design option: Standard, Anti-rotation, Anti-backlash or Protection nut
Standard and custom end fittings, installation options, and drive shaft
Worm Gear Screw Jack systems are ruggedly designed and stated in standard versions with load managing capacities from 1/4 ton to 100 tons. They might be used individually or in multiple arrangements. There are no “regular” travel lengths and all Worm Gear Screw Jack systems are designed to specification.
The jack housings are constructed with ductile iron and proportioned to support the rated capacity of the unit. MJ, 1/4 ton, and 1/2 ton models have light weight aluminum housings.
Each Worm Gear Screw Jack incorporates an alloy metal worm which drives a higher strength bronze worm equipment (drive sleeve). The worm shaft is supported on antifriction tapered roller bearings with external seals provided to avoid lack of lubrication (sealed radial bearings on the MJ, 1/4 , 1/2, and 1 ton devices). The drive sleeve can be backed on antifriction tapered roller or ball thrust bearings. Rotation of the drive sleeve causes the lifting screw to translate or rotate, depending upon jack configuration.
The Inch and Metric Worm Gear Machine Screw Jacks incorporate an alloy or stainless worm which drives a higher strength bronze worm gear (drive 
sleeve). The worm shaft is supported on anti-friction tapered roller bearings with external seals provided to prevent lack of lubrication. The drive sleeve is usually supported on anti-friction tapered roller or ball thrust bearings. Rotation of the drive sleeve causes the thread lifting screw to translate or rotate, depending upon jack configuration.
The threads are precision formed, typically using Class 2-C (Centralizing) tolerances. Jack lift shaft lead tolerance is approximately ±0.004″ per foot.