Worm Gear electrical ball screw jack, anti-Rotation and higher pitches available
Translating(traveling screw) and rotating (traveling nut) configurations
Move loads and apply force more efficiently than various other machine screw actuators
No self-locking! Because of having less friction, a holding brake is necessary: a electric motor brake or a spring pressure brake is necessary.
These worm gear screw jacks are very precision and reliability, it can meet all the necessary security, cost-efficiency, and durability mandates of the application. High strength bronze worm gear can be used, the payloads from 0.5T to 100T . A total of 11 sizes can be found, 
each in a traveling nut version and a basic version.
The screw jacks can be used separately or in groups linked with drive shafts, joints, couplings, bevel gearboxes and additional mechanical components. In addition they could be driven by different motors: electrical, with either AC electric motor or DC motor and also hydraulic or pneumatic motors. All these motion control products can be built in many type jacking system arrangements or configurations.
Ball screw jacks are common where higher speeds and duty cycles are needed. Most screw jacks make use of trapezoidal screws Tr, because they’re simple, robust and inexpensive. The proportion of screw jacks that make use of ball screws is nevertheless constantly increasing. The reasons for this are mainly their pitch accuracy, their high efficiency (much less power consumption and much less heat generation) and the higher pitches available, which permit higher stroke speeds.
A screw jack can truly add a machine cut lifting nut. Because of this model screw jack, only the bronze nut move combined with the screw shaft. The lifting screw will not slide. It is certainly similar to the worm screw jack linear actuator functioning theory which converts rotational movement into linear motion. From this stage to understand, a power linear actuator is certainly a motorized screw jack.
The screw thread of screw jack can be acme screw and ball screw. So are there few variations of the screw jack. Commonly, machine screw jack and ball screw jack can be found in your engineer task. Compared with acme screw, the ball screw is better as there are ball bearings between the nut and screw. The anti-friction ball bearing can boost the ball screw efficiency.