There is actually a big difference between these two products. Wheel bearing refers specifically to the first generation of press-in bearings, such as double-row angular contact ball bearings and double-row tapered roller bearings. Wheel hub bearing refers to the complete hub unit assembly.

When replacing a wheel bearing, it is critical to follow the correct steps and precautions to ensure safety and the durability of the bearing.

The grades of steel balls are generally divided according to parameters such as diameter, roundness, and surface finish. Common grades include G3, G5, G10, G16, G20, G24, G28, G40, G60, G100, G200, etc. 

The ISO standard defines bearings with different accuracy grades, including P0, P6, P5, P4 and P2 grades. These grades reflect the machining accuracy and performance of the bearings.