What is a mechanical fastener?

A mechanical fastener is indeed defined as a device used to join two or more components together. These fasteners can come in various forms, such as bolts, screws, nuts, and rivets, and they are crucial in assembling structures, machinery, and various metal fabrication applications. The primary function of mechanical fasteners is to provide a secure connection that can maintain the integrity and stability of the joined components under various loads and conditions.

While other options mention electrical connections, measurement methods, and cutting processes, they do not pertain to the definition or function of mechanical fasteners. By focusing on the purpose and capability of mechanical fasteners, it becomes clear why this answer is the most appropriate choice when discussing how parts and materials are assembled in metal fabrication and related fields.