A bolt is an externally helical threaded fastener capable of being tightened or released by a twisting force (torque) to a matching nut. The bolt has an external male thread requiring a matching nut with a pre-formed female thread.

Bolt-on fasteners are a type of fastening system that involves using bolts or screws to secure one object to another. These fasteners typically consist of a bolt or screw, a nut, and often a washer, providing a secure and reliable connection between two components. Bolt-on fasteners are widely used in various industries and applications, including construction, automotive, aerospace, machinery, and electronics. They offer several advantages, including ease of installation, disassembly, and reusability, making them versatile and cost-effective solutions for joining components together. Bolt-on fasteners come in a range of sizes, materials, and configurations to accommodate different load requirements, environmental conditions, and aesthetic preferences. Whether it's assembling structural steel beams, securing automotive components, or fastening electrical panels, bolt-on fasteners play a crucial role in countless engineering and manufacturing projects, providing strength, durability, and reliability.