Deep Groove Ball Bearings FAG 6318 -C4

The FAG 6318-C4 deep-groove ball bearing, measuring 90 × 190 × 43 mm and featuring increased bearing clearance, is designed for bearing arrangements subject to thermal loads.

The FAG 6318-C4 single-row deep-groove ball bearing accommodates radial forces as well as axial loads in both directions. Manufactured from standard roller bearing steel 100Cr6, this open roller bearing features a sheet steel cage and complies with the standard tolerance class P0/PN or ABEC 1. With a bore of 90 mm, an outside diameter of 190 mm and a width of 43 mm, this design is suitable for demanding industrial applications. The permissible temperature range is from –20 to +150 degrees Celsius.

In which applications is the 6318-C4 deep groove ball bearing used?

The 6318 -C4 deep groove ball bearing is primarily used in bearing arrangements where significant temperature differences arise between the inner and outer rings during operation. The open design allows for direct lubrication via the surrounding housing system, for example with oil or grease. Typical applications are found in industrial settings involving heat input, where components are subject to thermal expansion. In such applications, the bearing primarily absorbs radial loads.

Why is the increased C4 bearing clearance required for this design?

The significantly increased radial bearing clearance C4 compensates for thermal expansion of the shaft or the inner ring during operation. When components heat up during operation, the internal bearing clearance decreases. A bearing with standard clearance could consequently become stressed and overheat. The C4 clearance provides additional leeway prior to installation, ensuring that the rolling elements can still move freely after the bearing has heated up and the fit has become tighter. The housing design protects the open rolling bearing from the ingress of dirt.