Next, check whether the steel stamping is legible. In most cases, there are printed brand words and labels on the bearing body. The font is very small, but most of the products use stencil printing technology. Moreover, the factory press the characters before the heat treatment, so although the font is small, it is deeply concave and very clear.

If it is a counterfeit product, its font is very fuzzy. Because of the rough printing technology, the font floats on the surface. Then listen to whether the bearing has noise. Hold the inner sleeve of the bearing, turn the outer sleeve to make it rotate, and listen for bearing noise. The production conditions of most counterfeit products are backward. It is inevitable that impurities such as sand will be mixed in the production process, and they will be hidden in the bearing body, so noise will be generated when rotating.