Bearing Inserts – Maximum Permissible Speed

To ensure optimal operation and lifespan of bearing inserts, it is important to adhere to the maximum recommended rotational speeds (RPM). These speeds depend on both the shaft tolerance and the type of seal the bearing is equipped with.

Shaft Tolerances and Impact on Speed

The table below shows the maximum RPM for bearing inserts in relation to the shaft tolerance class (h6, h7, h8, h9, h11). A tighter tolerance (e.g., h6) provides better centering precision, allowing for higher speeds. Looser tolerances reduce the maximum allowed RPM to avoid vibration and increased wear.

Seal Types and Friction

Bearing inserts with additional seals, such as R3 and R6 lip seals, have increased friction, which necessitates further reduction in operational speed. Therefore, the maximum speeds for bearings with these seals are shown in the right column. Always follow the lowest value, whether from the shaft tolerance or the seal’s limitation, for safe and stable operation.

Bearing Types

This guide applies to the following bearing types:

• UC

• HC

• SA

• SB

• UK

… and similar bearing inserts commonly used in steel bearings and flange bearings.

See the full table below for detailed values based on shaft diameter (d in mm), tolerance, and seal type