The generic term "screw jack" or jackscrew generally refers to a product that utilises a gearbox assembly and a transmission medium (lead screw, ball screw or roller screw) which, through the use of a motor or hand wheel, converts this rotary motion into linear motion.

Screw jacks transform the rotatory movement provided by an electric, hydraulic, pneumatic or manual motor into a linear motion: a vertical lifting, in pull or push, or an horizontal positioning. They can be used individually or in configurations made up of several screw jacks coupled together through couplings, transmission shafts and bevel gear

All screw jacks could be also used for:
alternating or direct current motors;
hydraulically-operated motors
pneumatic motors
manually-operated control

* Load capacity: 2.5 to 1000 kN
* Design version with trapezoidal spindle drive
* rotating and non-rotating spindle drive
* Linear speed: up to 25mm/s
* Duty cycle: up to approx. 20% (depending on load)
* statistically self-locking
* Operating with three-phase AC motor

The screw jacks are utilized in various applications where there is a need for accurate lifting, lowering, pulling or pushing. Manually or electrically-operated versions are also available, with capacities up to 1000 kn and a spindle length of 10 meters. These devices are designed with a built-in structure,