A screw is a type of hardware fastener that features a helical groove extending around the circumference of a cylindrical shaft. This mechanism converts rotational motion to linear motion and torque to a linear force, making it one of the six classical simple machines. Screws are widely used in threaded fasteners to hold objects together and in various devices such as screw tops for containers, vises, screw jacks, and screw presses
. Additionally, screws are useful for holding things together, lifting heavy items, and tightening things. They can pull or push an object together and are also used to lift heavy items
