Pressure angle

Angular contact ball bearings have different contact angles because they are designed to support both radial and axial loads. The contact angle or contact angle varies depending on the design and construction of the bearing to ensure optimum performance for the specific load requirements.

However, there are some common standard contact angles that are frequently found in angular contact ball bearings:

1. 15°: Angular contact ball bearings with a contact angle of 15 degrees are widely used and offer a good combination of radial and axial load carrying capacity. They are suitable for applications where moderate axial loads occur.
2. 25°: Angular contact ball bearings with a contact angle of 25 degrees offer a higher axial load carrying capacity than bearings with a contact angle of 15 degrees. They are therefore more suitable for applications with higher axial loads.
3. 30°: Bearings with a contact angle of 30 degrees offer an even higher axial load carrying capacity and are suitable for applications with significant axial loads.
4. 40°: Angular contact ball bearings with a contact angle of 40 degrees have a particularly high axial load carrying capacity and are often used in applications with very high axial loads.

The contact angle of an angular contact ball bearing is expressed by an abbreviation in the suffix.

At NSK, for example:

NSK for the contact angle for angular contact ball bearings

• A 30°pressure angle e.g. 7012 A TR SUL P3
• A5 25°pressure angle e.g. 7012A5 TR SUL P3
• B 40°pressure angle e.g. 7308 BEAT85
• C 15°pressure angle e.g. 7908 C T SUL P4

The choice of the appropriate contact angle depends on various factors, including the type of load the bearing must support, the operating conditions, the desired service life of the bearing and other application requirements. Bearing manufacturers offer a variety of options with different contact angles to meet specific application requirements.

Further interesting links

• Screw ball bearing (sealed)

• Speed (rolling bearing)