Cylindrical Roller Bearings SKF NU224 ECM/C3

The SKF NU224 ECM/C3 cylindrical roller bearing is a separable idler bearing with a brass cage and increased C3 clearance, designed for a 120 mm shaft diameter.

The SKF NU224 ECM/C3 cylindrical roller bearing is designed as a single-row rolling bearing for high radial loads. Thanks to its optimised internal design and key dimensions – a 120 mm bore, 215 mm outside diameter and 40 mm width – this bearing can accommodate considerable radial loads. The solid brass cage guides the cylindrical rollers under demanding operating conditions. As this is an open bearing without seal washers, lubrication is supplied via the surrounding housing structure.

When is the NU224 ECM/C3 cylindrical roller bearing used as a non-locating bearing?

In many industrial bearing arrangements, heat-induced changes in shaft length occur. The NU design serves as a floating bearing in such cases, as the inner ring is flangeless and can be removed from both sides. This allows the bearing to compensate for axial displacement between the shaft and housing without constraint within the bearing itself. Typical applications include bearing arrangements subject to high radial forces, where a separate fixed bearing provides axial guidance.

What are the advantages of the brass cage and the C3 clearance?

The design suffix ‘M’ refers to the solid brass cage, which is resistant to vibrations, shock loads and lubricant additives. The suffix ‘C3’ indicates a slightly increased radial clearance. This additional clearance compensates for operational heating or tight fits without the bearing becoming stressed. With a permissible temperature range of -30 to +150 degrees, this design meets the demanding thermal requirements of mechanical engineering.