Deep Groove Ball Bearings SKF 6309 /C3

The SKF 6309/C3 deep groove ball bearing, with a 45 mm bore and increased bearing clearance, ensures low-friction operation during thermal expansion.

The 6309 /C3 deep groove ball bearing is a single-row radial ball bearing with an inner diameter of 45 mm, an outer diameter of 100 mm and a width of 25 mm. Manufactured from standard roller bearing steel 100Cr6, this design primarily accommodates radial forces as well as axial loads in both directions. The open design without sealing washers allows unimpeded circulation of lubricants within the housing and is suitable for protected installation spaces in mechanical engineering.

In which installation situations does the open deep-groove ball bearing 6309 /C3 prove its worth?

This bearing is primarily used in enclosed housing designs where the lubricant supply is provided externally via the installation space using oil or grease. Thanks to the integrated sheet steel cage, the rolling bearing remains dimensionally stable even under dynamic loads. As the bearing is of an open design, there are no friction losses caused by rubbing seal lips. This is particularly advantageous for industrial applications where low-friction operation is required within the specified temperature range of -20 to +150 degrees.

What are the advantages of the increased C3 bearing clearance when the bearing heats up?

The suffix C3 indicates a slightly increased radial clearance compared with the standard version. This version is particularly recommended where temperature differences between the rotating shaft and the surrounding housing are expected during operation. If the inner ring expands more than the outer ring due to operating heat, the increased radial clearance compensates for this difference. Even with tight fits on the shaft, sufficient operating clearance is maintained to prevent the rolling elements from seizing.