A bolt is a mechanical fastener characterized by a threaded shaft. Typically, bolts are inserted through unthreaded holes in components, and a nut is screwed onto the threaded end to create a clamping force. This clamping force helps secure multiple parts together, preventing axial movement and contributing to the formation of a bolted joint.

Bolts come in various types, shapes, and sizes, and they are widely used in construction, machinery, and various other applications to join and fasten components securely.

The design of a bolt includes a head, often hexagonal, and a shaft with external threading. The specific type and characteristics of bolts can vary based on their intended use and the materials involved.