screw thread

Also called worm. the helical ridge of a screw.

a full turn of the helical ridge of a screw.

Origin of screw thread

First recorded in 1805–15

The screw-thread is then to be cleaned out, and the new vent-plug screwed in.

Ordnance Instructions for the United States Navy. |Bureau of Ordnance, USN
In the same manner I close the screw-thread hole in gas tubes used for conducting steam.

Scientific American Supplement, No. 497, July 11, 1885 |Various
On one end also a right-handed, and on the other a left-handed, screw-thread is turned.

Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 |Various
It is provided with a screw-thread, by means of which its length, projecting downwards, is regulated.

Response in the Living and Non-Living |Jagadis Chunder Bose

The fracture usually took place just at the point where the screw-thread terminated.

Scientific American Supplement, No. 324, March 18, 1882 |Various

screw thread

the helical ridge on a screw formed by a die or lathe tool