Bolt

A bolt is one of the most widely used mechanical fasteners, consisting of a head and a threaded shank that works in conjunction with a nut or tapped hole to securely join two or more components. Bolts are extensively applied across mechanical equipment, building structures, bridge engineering, automotive manufacturing, and industrial assembly.
Depending on the application environment and load requirements, bolts are manufactured from carbon steel, stainless steel, or alloy steel, and can be further enhanced through heat treatment or surface finishing — including galvanizing, Dacromet coating, and electroplating — to improve strength, corrosion resistance, and service life.
Bolted connections are valued for their ease of installation, strong disassembly capability, and low maintenance costs, making them one of the most reliable and versatile fastening methods in modern industrial assembly and structural engineering.