Deep Groove Ball Bearings SKF 6218 /C3

The SKF 6218 /C3 deep groove ball bearing is an open, single-row rolling bearing with dimensions of 90x160x30 mm and an increased radial clearance (C3).

The SKF 6218/C3 deep groove ball bearing is designed to withstand high radial forces whilst also handling axial loads in both directions. Manufactured from standard roller bearing steel (100Cr6), this single-row bearing is characterised by dimensional stability and smooth running characteristics. As it is an open design without seals, the component can be integrated directly into systems with housing lubrication. The guided sheet steel cage maintains the rolling elements at a uniform distance.

In which applications is the 6218 /C3 deep groove ball bearing used?

This radial ball bearing is used in mechanical and plant engineering for shaft diameters of 90 mm, particularly at elevated operating temperatures or where thermal gradients are present. Typical applications include enclosed units and housing designs. Thanks to its open design, the lubricant reaches the raceways unimpeded, which is advantageous in lubrication systems with continuous flow or oil bath lubrication.

What is the function of the C3 bearing clearance in this bearing?

The C3 designation indicates an increased radial bearing clearance compared to the standard. This internal clearance is designed to accommodate heat-induced expansion of the shaft and inner ring during operation. Even with tight fits or temperature differences between the inner and outer rings, the necessary operating clearance is maintained to prevent the rolling elements from seizing.