Deep groove ball bearings, different grades of bearings, have very different prices. There are three main criteria for evaluating the quality of deep groove ball bearings:

1. Bearing tolerances: The tolerances and geometric tolerances of deep groove ball bearings are expressed by tolerance grades. For example, P6 grade is better than P0 grade, P5 grade is better than P6 grade, etc. The price of P5 is twice that of P6.

2. Vibration levels: Z0, Z1, Z2, Z4, etc. Group Z1 is better than group Z0, group Z2 is better than group Z1, etc.; or group V1 is better than group V0, group V2 is better than group V1, etc.

3. Noise, there is no standard for this yet. However, some equipment with special use occasions has special requirements for noise.

4. Bearing material: The material of deep groove ball bearings is divided into bearing steel, carbon steel, stainless steel, and ceramics. The prices of bearings vary greatly.