Editing Screw thread (section)

==Applications==
Screw threads have several applications:
* Fastening:
** Fasteners such as [[wood screw]]s, plastic screws, [[Screw#Machine screw|machine screws]], [[nut (hardware)|nuts]], and [[bolt (fastener)|bolt]]s.
** Connecting [[threaded pipe]]s and [[hose (tubing)|hose]]s to each other and to caps and fixtures.
* Gear reduction via [[worm drive]]s
* Moving objects linearly by converting rotary motion to linear motion, as in the [[leadscrew]] of a [[Jack (device)|jack]].
* Measuring by correlating linear motion to rotary motion (and simultaneously amplifying it), as in a [[Micrometer (device)|micrometer]].
* Both moving objects linearly and simultaneously measuring the movement, combining the two aforementioned functions, as in a leadscrew of a [[lathe]].

In all of these applications, the screw thread has two main functions:
* It converts rotary motion into linear motion.
* It prevents linear motion without the corresponding rotation.