Screw Jack

     Screw Jack used for constructions level adjustment and lifting, pressing other equipments. Professional design.
     A screw jack is a type of jack which is operated by turning a lead screw. A screw jack's compressive force is obtained through the tension force applied by its lead screw. An Acme thread is most often used, as this thread is very strong and can resist the large loads imposed on most jackscrews while not being dramatically weakened by wear over many rotations. These types are self-locking, which makes them intrinsically safer than other jack technologies like hydraulic actuators which require continual pressure to remain in a locked position. Most screw jack is lubricated with grease.