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simple machine consisting essentially of a solid cylinder, usually of metal, around which an inclined plane winds spirally, either clockwise or counterclockwise. It is used to fasten one object to another, to lift a heavy object, or to move an object by a precise amount.
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A jack operated by a screw mechanism. Also known as screw jack.
The screw of such a jack.
A jack in which a screw is used for lifting; carries a plate which bears on the load.
A jack operated by a screw mechanism. Normally, it is used for raising light aircraft and lighter loads. Also known as a screw jack.