# Know-How To Read Bearings Specification

A bearing is a machine element that constrains relative motion to only the desired motion and reduces friction between moving parts.

Each bearing has a specified number which tells about the type and size of the bearing.

### Let’s take an example below :

1. Prefix :
2. Basic Number:
3. Suffix

## Prefix

• Note: Each bearing company may create its own prefixes. e.g. E2. = SKF Energy Efficient bearings

## Suffix

### Bearing Numbers

The example at the header shows a 6001 2RS bearing. So what does the 6001 actually mean?

• (6)001 – This first number relates to the bearing type, as shown in the table below type 6 is a deeply grooved roller bearing.

### 1. Self-Aligning Ball Bearing

• This kind of ball bearing has a spherical outer race, allowing the axis of the bearing to “wander around”. This is important because misalignment is one of the big causes of bearing failure.

### 5. Axial Deep Groove Ball Bearing

• Intended for exclusively axial loads.

### 7. Single-Row Angular Contact Bearing

• The specific geometry of angular contact bearing raceways and shoulders creates ball contact angles that support higher axial loads

### 8. Axial Cylindrical Roller Bearings

• Axial cylindrical roller bearings comprise axial cylindrical roller and cage assemblies and shaft and housing locating washers.
• The bearings have particularly small axial section height, have high load carrying capacity and high rigidity, and can support axial forces in one direction.

## 6(0)01

This second number relates to the bearing series, which reflects the robustness of the bearing.

As you go up the scale below from 9 to 4 the inner and outer race thickness will usually increase along with the ball size, this will be to help cope with the extra load.

9 Very thin section
0 Extra light
1 Extra light thrust
2 Light
3 Medium
4 Heavy

## 60(01)

The 3rd and 4th digits of the bearing number relate to the bore size of the bearing, numbers 00 to 03 have a designated bore size depending on the number.

00 10mm
01 12mm
02 15mm
03 17mm

While numbers over 03 simply have a bore size which is 5 times that of the 3rd and 4th digit.