(1) Radial bearings---mainly used for radial direction loading, its nominal contact angle is between 0 and 45, as per the nominal contact angle, it can be divided to:radial contact bearing---the nominal contact angle is 0; and centripetal angle contact bearings--the nominal contact angle is between 0 and 45.
(2) Thrust bearings---mainly used for axial direction loading, its nominal contact angle is between 45 and 90. And as per the nominal contact angle, it can be divided to: axial contact bearings--nominal contact angle is 90; and thrust angle contact bearings---nominal contact angle is between 45 and 90.

2. Classify according to rolling body:
1). Ball bearing---the rolling body is balls;
2). Roller bearing---the rolling body is roller. As per the roller type, it can be divided into: cylindrical roller bearing----roller body is cylindrical roller, length of cylindrical roller/diameter is less or equal to 3; And needle bearings--- roller body is needle.

3. Classify according to self-aligning or not:
1). Self-aligning bearing---roller path is self-aligning, canadapt to the angle difference and angle movement of two roller path's axis;
2). Non self-aligning bearings(rigid bearings)---can prevent the angle offset of axis of two roller paths.

4. Classify according to the row number of roller body:
1). Single row bearings---has single row roller body;
2). Double row bearings---has two rows of roller body;
3) Multi-row bearings---has multi-row of roller body;

5. Classify according to whether the bearing components can be separated:
1). Separatable bearings---has separatable components;
2). Inseparatable bearings---bearing rings can not be separated after assembling well;

6. Classify according to bearing size (outer diameter):

(1). Micro bearings--- Nominal O.D is smaller than 26mm;

(2). Small bearings--- Nominal O.D is 28~55mm;

(3). Small and medium bearings--- Nominal O.D is 60~115mm;

(4). Medium and large bearings--- Nominal O.D is 120~190mm;

(5). Large bearings--- Nominal O.D is 200~430mm;