Bearings can be divided into two categories: rolling bearings, sliding bearings. Most of our daily lives is rolling bearings.

Rolling bearing and their corresponding classification:

Class 0: double row angular contact ball bearings

Category 1: aligning ball bearings

Category 2: Spherical Roller Bearings and Thrust Spherical Roller Bearings

Category 3: Tapered Roller Bearings

Category 4: Double row deep groove ball bearings

Category 5: Thrust ball bearings

Category 6: deep groove ball bearings

Class 7: angular contact ball bearings

Class 8: thrust cylindrical roller bearings

Class 9: thrust tapered roller bearings

N: cylindrical roller bearings and needle roller bearings

Will normally be attached one or few letters of the code after the code of cylindrical roller bearings, used to represent the rib structure type, such as: NJ, NU, NUP, and so on. Double row cylindrical roller bearings or columns are with the letters NN. Needle roller bearings are usually letters NA or NK.

U: spherical ball bearings

QJ: four-point contact ball bearings

For the classification of the new code, old code is different, such as: understanding of bearing most of all know that this argument of "0 deep groove ball bearings, which is the old code, a new Code of deep groove ball bearings 6.

Plain bearings Category:

Integral bearing;

Split bearings;

self- aligning bearing .

Sliding bearings are generally used in the case of high-speed, high precision or special overloaded.