Deep Groove Ball Bearings SKF 6308 -Z/C3

The SKF 6308 -Z/C3 deep groove ball bearing, measuring 40x90x23 mm, with a single-sided sheet metal cover and C3 clearance, is designed for shaft mountings subject to thermal stress.

The 6308 -Z/C3 deep groove ball bearing is a single-row rolling bearing made from 100Cr6 bearing steel, designed to accommodate radial and moderate axial loads. The design, with an inner diameter of 40 mm and an outer diameter of 90 mm, features a sheet steel cage and is designed for operating temperatures ranging from -20 to +150 degrees. Thanks to its tolerance class P0/ABEC 1, this model fits precisely into standardised housing seats and is suitable for industrial drive trains as well as for replacement during maintenance.

What is the 6308 -Z/C3 deep groove ball bearing suitable for in industrial applications?

This bearing is particularly suitable for bearing locations in enclosed assemblies where temperature differences occur between the shaft and the housing during operation. The single-sided Z-cover plate protects the raceway from coarse dirt particles, whilst the open opposite side allows for targeted relubrication via the housing cavity where required. This combination is specifically used in drives with a controlled lubricant supply.

What does the C3 bearing clearance mean for the 6308-Z/C3 deep groove ball bearing?

The C3 designation indicates a slightly increased radial clearance compared to the standard when the bearing is unloaded. This increased radial clearance compensates for thermal expansion at operating temperatures up to +150 degrees and prevents the rolling elements from seizing up when tight fits cause the inner ring to expand. When selecting a bearing, it is important to check whether the specific installation scenario requires such thermal expansion to ensure smooth running of the rolling elements.