a jack for lifting consisting of a screw steadied by a threaded support and carrying a plate or other part bearing the load.
Also called screw jack.

1760–70; jack1 + screw

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World English Dictionary
jackscrew (ˈdʒækˌskruː)
another name for screw jack

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Jackscrew, centering pins, and knockout dowel pins shall also be furnished.
They turned the large metal jackscrew attached to the band around the stone.
The flap actuator jackscrew exhibited no abnormal signs of wear-it rotated freely when checked with the primary motor removed.
The unit installs by turning the jackscrew at the bottom of the pole.
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