Bearing type code - bearing type

We often see people say 0 class bearings, but many people do not know what class 0 bearings, I offer you to spread the knowledge in this regard.

Bearing type code:

0 class: double row angular contact ball bearings

Category 1: aligning ball bearings

Category 2: Self-aligning roller bearings and spherical roller thrust bearings

Category 3: Tapered Roller Bearings

Type 4: Double-row deep groove ball bearings

Category 5: thrust ball bearings

6 categories: deep groove ball bearings

7 categories: angular contact ball bearings

8 categories: thrust cylindrical roller bearings

N: cylindrical roller bearings

One double row or column with the letters NN said

U: spherical bearings

QJ: four-point contact ball bearings

This is the new code and old code 0 class is deep groove ball bearings, this is not to say in order to avoid misleading