Compact JTD Series Cubic Ball screw jack is a highly efficient jack for high speed, high frequency operations. Load capacity from 1 to 30 tons. Major components include accurate ball screw and high precision worm gear. Ball screw generates high efficiency and its compact drive unit produces high power. Compared to the Power Screw Jacks (Machine Screw Type), its high efficiency allows easier high speed drive. Long and predictable ball screw life.