What Is the Difference Between a Screw and a Bolt?

A common source of confusion in the world of fasteners is the distinction between screws and Bolts. While they may appear similar, they serve distinct purposes and have subtle design differences. A screw is a threaded fastener with a helical ridge, or threads, running along its shank. It is primarily used to fasten two or more components together by creating a secure and often permanent connection. Screws typically feature a tapered or pointed end, known as the tip, which allows them to penetrate materials, including wood, metal, or plastic, when rotated. They rely on the threads to hold everything in place and are often driven with screwdrivers or power tools.

On the other hand, a bolt is also a threaded fastener, but it is designed to be used with a Nut. Bolts have a flat, blunt end, known as the head, which provides a surface for tools like wrenches or sockets to grip and turn them. The threads on a bolt are typically incomplete near the head, allowing for a nut to be threaded onto it. Bolts are commonly used in applications where a detachable connection is required, such as assembling machinery or securing structural elements.

In summary, the key differences between screws and bolts lie in their intended use and design features. Screws are self-threading fasteners with a pointed end, used for permanent or semi-permanent connections, while bolts are designed for use with nuts, featuring a head for wrenches and typically used in applications requiring disassembly and reassembly. Understanding these distinctions is essential for selecting the right fastener for a particular job, ensuring the structural integrity and functionality of the assembled components.