Importance of Wheel Bolt and Nut

Sunrise Machinery is professional factory on wheel bolt and nut.

Wheel bolts refer to the bolts installed on the wheel hub and brake drum, and are used to connect wheel, axles, suspension systems, braking system. Bolts play an important role on ensuring the stability and safety of vehicle.

As we known,the weight of a vehicle is ultimately borne by its wheels, and the connection between wheel and body is achieved through these bolts. Hence, these bolts actually bear the weight of the entire vehicle.In addition, bolts transmit the torque output by the gearbox to wheels. Bolts are subjected to both pulling force and shear force when operation.

Bolts are generally made of high-strength steel, such as 40Cr, $45 steel etc.. The strength grade is usually marked on the head of the bolt, which includes 8.8, 10.9,and 12.9. The higher the numerical value, the higher the intensity. The tensile strength of bolt at Grade 8.8 is 800MPa,and 1000MPa for Bolt at Grade 10.9. 

People refer the bolt of strength of 8.8 or above, made of low-carbon alloy steel or medium carbon steel and with heat-treatment, to high-strength bolts. Wheel bolts are high-strength screws,and vehicles at different models and load capacity match with bolts of different strength. Of these,Grade 10.9 is the most common wheel bolt, and bolt at Grade 8.8 is generally for low-end models, while bolt at Grade 12.9 usually matches with heavy-duty truck.