There high reliability, practically maintenance free designs and their simplicity of use, render mechanical worm gear screw jacks ideal for the most demanding and variable working conditions. They can be used for hoisting, pulling, lining up or moving within permissible applications. As well as being used individually, they can be mounted in systems to offer perfect synchronization even with unbalanced loads. Their particular construction makes them absolutely irreversible and therefore once the input shaft has stopped they remain in position without the need for brakes etc., even when the load is applied to the spindle. Having a completely machined body with double guides makes all types of mounting arrangements possible. Applications with electric, pneumatic and hydraulic motors are within our range.