Bearing Inserts – Internal Clearance

The bearing inserts in our mounted ball bearings are designed with slightly larger internal clearance (also known as internal clearance) compared to standard single-row ball bearings. This provides better tolerance to misalignment and shaft deflection during operation.

Tolerances Adapted to the Application

• Most bearing inserts are supplied with C3 clearance, which is standard for UC, HC, SA, and SB types.
• Bearing inserts for tapered sleeve locking, such as UK and GSH, are supplied with C4 clearance, as the sleeve expansion leads to an increase in the inner ring.
• High-temperature bearings are supplied with larger clearances, typically C5 or more, to compensate for thermal expansion.

Overview of Internal Clearance

The table below shows the radial clearance in micrometers (μm) for bearing inserts, depending on the nominal bore diameter (d in mm) and clearance class (C2 to C5). Use this as a reference when selecting a bearing.