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 effectively than other machine screw actuators
No self-locking! Due to having less friction, a keeping brake is necessary: a electric motor brake or a spring pressure brake is required.
These worm equipment screw jacks are very precision and reliability, it could meet all the necessary protection, cost-efficiency, and durability mandates of the application. High power bronze worm gear can be used, the payloads from 0.5T to 100T . A total of 11 sizes can be found, each in a touring nut version and a simple version.
The screw jacks can be utilized separately or in groups connected with drive shafts, joints, couplings, bevel gearboxes and other mechanical components. They also could be powered by different motors: electrical, with either AC motor or DC motor and also hydraulic or pneumatic motors. Each one of these motion control items can be built in many type jacking program arrangements or configurations.
Ball screw jacks are common where higher speeds and duty cycles are needed. Most screw jacks use trapezoidal screws Tr, because they’re simple, robust and inexpensive. The proportion of screw jacks that make use of ball screws is however constantly increasing. The reasons for this are primarily their pitch accuracy, their high efficiency (much less power consumption and much less heat era) and the higher pitches offered, which permit higher stroke speeds.
A screw jack can truly add a machine cut lifting nut. For this model screw jack, only the bronze nut move together with the screw shaft. The lifting screw does not slide. It is usually like the worm screw jack linear actuator operating principle which converts rotational motion into linear motion. Out of this 
stage to understand, a power linear actuator can be a motorized screw jack.
The screw thread of screw jack can be acme screw and ball screw. So there are few variants of the screw jack. Commonly, machine screw jack and ball screw jack are available in your engineer task. Compared with acme screw, the ball screw is usually more efficient as there are ball bearings between the nut and screw. The anti-friction ball bearing can increase the ball screw efficiency.