Nuts are classified according to their intended use and structural design; common types include hexagonal nuts, square nuts, and round nuts, while specialized types encompass nuts featuring integrated leak-testing ports, anti-loosening bolt-and-nut assemblies, and anti-vibration rivet nuts.
Based on material composition, nuts are primarily manufactured from carbon steel, stainless steel, and high-strength alloy steel, as well as materials such as copper and aluminum.
In terms of strength grade, high-strength nuts utilized in the automotive industry typically fall into grades such as 8.8, 9.8, 10.9, and 12.9; fasteners of these grades require heat treatment to achieve the specified tensile strength and yield ratio.
Within the automotive sector, common thread specifications for nuts include M6, M8, M10, M12, M14, and M16, the selection of which must be tailored to the specific application site. For load-bearing components-such as suspension systems and chassis assemblies-it is mandatory to utilize high-strength nuts of Grade 8.8 or higher, with particular emphasis placed on incorporating anti-loosening design features.
