Deep Groove Ball Bearings SKF 6209 /C3

The SKF 6209 /C3 deep groove ball bearing is an open, single-row rolling bearing measuring 45x85x19 mm with increased clearance for demanding operating temperatures.

As a single-row radial ball bearing, the SKF 6209/C3 deep groove ball bearing primarily accommodates radial loads as well as moderate axial loads. Thanks to its open design without sealing washers, this rolling bearing is particularly suitable for enclosed gearbox housings or oil-lubricated systems where the lubricant circulates freely. The rings and rolling elements are made of standard rolling-element steel (100Cr6). In combination with the guided sheet steel cage, the bearing is designed for operating temperatures ranging from -20 to +150 degrees.

What is the 6209/C3 deep groove ball bearing suitable for?

This rolling bearing is suitable for designs subject to high thermal loads or tighter fits, which reduce the radial operating clearance. Typical applications include electric motors, gearboxes and general industrial drives with centralised oil or grease lubrication. As the bearing is of an open design, the surrounding housing structure protects the raceways from dirt and moisture. Manufacture to the Normal tolerance class (P0/PN or ABEC 1) ensures reliable concentricity in standard mechanical and plant engineering.

What does the C3 bearing clearance mean for the 6209/C3 deep groove ball bearing?

The designation C3 indicates a slightly increased radial clearance compared with the standard version. This greater radial clearance compensates for thermal expansion between the inner and outer rings during operation, without the balls becoming jammed between the raceways. Similarly, the C3 bearing clearance compensates for the expansion of the inner ring when it has a fixed press fit on the shaft. Consider using this variant if temperature differences occur between the rotating shaft and the housing, or if higher speeds generate additional frictional heat.