Bearing Identification

Product category:

First measure the bearing in millimetres

Bearings are measured always in the order -

Shaft x Outside Diameter x Width.

Second identify the type

Is it a standard single row ball bearing - the most common type, such as a 6203 2RS?

Grease is retained and dirt excluded from the bearing by a double rubber seal indicated by 2RS after the bearing number. Occasionally two metal shields are used indicated by ZZ after the bearing number. For most electric motor applications 2RS is the preferred type even if the ZZ type was used originally.

Is it a single row or double row angular contact bearing that can take high radial and high axial loads in both directions? e.g. A 5206 2RS has a higher load rating when compared with the equivalent single row bearing of the same shaft size and outside diameter a 6206 2RS.

Is it a roller bearing with parallel rollers such as a N206?

These may also be supplied as a NU206 with both types generally being interchangeable in electric motor applications.

Is it an angular contact bearing which can take high axial load in one direction only such as a 7314 B? The 'B' signifies a 40° contact angle - the most common angle for electric motor applications. This type is most commonly used as the lower bearing in vertically mounted electric motors.

The above types cover the vast majority of bearings used in electric motor applications.