Simple screw model, Nairobi Industrial Area

A simple screw is a mechanical device designed to convert rotational motion into linear motion or force. It consists of a helical thread (spiral ridge) wrapped around a central cylindrical shaft. The key elements of a screw are:

Shaft: The solid cylindrical part, often referred to as the body of the screw.
Thread: The spiral ridge around the shaft, responsible for the screw's functionality.
Pitch: The distance between adjacent threads, which determines how far the screw moves linearly with one full rotation.