Screw jacks are the solution for achieving linear motion with medium to high forces at low to medium speeds. They are ready-engineered packages that are easy to use and they have multiple options so they can be readily customised to individual needs. Standard ranges cover forces from 5 to 1000kN (0.5 to 100 tonnes). Machine designers are attracted to the self-contained and easily controllable characteristics of screw jacks. Alternatives are ball screws, roller screws, hydraulic and pneumatic cylinders. To illustrate the adaptability of screw jacks, they are used in cranes, theatre lifts, steel rolling mills, radio telescopes, access doors, glass machinery and agricultural silos.
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