(1) Size specifications: the diameter of the hexagonal bolt, that is, its rod diameter or nominal diameter, is a key parameter to measure its size. Common hexagonal bolt diameter specifications on the market include but are not limited to M3, M4, M5, M6, M8, M10, M12, M16, M20, M24, M30, M36, etc. These different sizes of hexagonal bolt diameters meet the fastening needs of many industries and application scenarios. For example, M3 and M4 hexagon bolts are often used for the assembly and fixing of small components such as electronic equipment and mechanical parts because of their small and lightweight characteristics. The M6 and M8 hexagonal bolts are widely used in various industrial fields such as bridge construction, machinery and equipment, and automobile manufacturing because of their moderate strength and versatility.

(2) Length specifications: The length specifications of hexagonal bolts are rich and diverse, and can be customized according to the specific needs of different application scenarios. Common standard lengths include 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, etc. In special cases, in order to meet the needs of special applications, manufacturers can also provide shorter or longer custom lengths.

(3) Material classification: The material of hexagonal bolts directly affects its physical properties and application scenarios. Common hex bolt materials on the market include carbon steel, stainless steel (such as 304, 316), titanium alloy, aluminum alloy and so on. Carbon steel is widely used in most common machinery manufacturing and construction work because of its good strength and low cost. Stainless steel hexagon bolts because of its excellent corrosion resistance, especially in the chemical, pharmaceutical, food and other fields have strict hygiene requirements or high humidity, high salt and other harsh environment fastening needs.