Jackscrew

A 2.5-ton screw jack. The jack is operated by inserting the bar (visible lower left) in the holes at the top and turning.

A jackscrew, or screw jack, is a type of jack that is operated by turning a leadscrew. It is commonly used to lift moderate and heavy weights, such as vehicles; to raise and lower the horizontal stabilizers of aircraft; and as adjustable supports for heavy loads, such as the foundations of houses.

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