1. By Feeling the surface 

 The bearing is seen as good quality as long as the surface of the bearing is bright, but it is not. The surface of the bearing should be look dark bright, and this dark bright is caused by whether it is the standard bearing material  and his grinding process and the way of cutting fluid.

2. Whether the chamfer is bright

The chamfering of the bearing can not determine the quality of the bearing, but it does reflect the processing method of the bearing. The chamfering is black, which indicates that the bearing hardness has been increased by heat treatment. Some people think that the bearing is not high-quality one if chamfering look brown by having not processed completely. This is a misunderstanding.

3.Judge from cage.

The idea of that the one-piece cage is better than the two bodies is falut. Although the one-piece cage produced with the new technology, it can save materials, but its performance on rotation  is worse than that of the two bodies.

Tic-Techs tells that the service life of the bearing is related totwo factors, one is that the quality of the bearing itself, and the other is the working condition of the bearing.