Cylindrical Roller Bearings SKF NU220 ECJ/C3

The SKF NU220 ECJ/C3 cylindrical roller bearing, a single-row idler bearing measuring 100x180x34 mm, accommodates very high radial forces whilst allowing for thermal linear expansion.

This single-row cylindrical roller bearing, the NU220 ECJ/C3, is designed for industrial applications involving purely radial loads. Thanks to the line contact between the cylindrical rollers and the raceways, the design can withstand high radial forces. The sheet steel cage guides the rolling elements precisely at medium to high speeds. As an open bearing without an integrated seal, the bearing can be flexibly connected to external lubrication systems using oil or grease.

What is the NU220 ECJ/C3 cylindrical roller bearing suitable for?

This design is suitable for rotating systems in which high radial loads act on rigid shafts whilst axial displacements also occur. The NU design features two fixed flanges on the outer ring, whilst the inner ring is flangeless. As a result, the bearing assembly compensates for temperature-induced changes in the shaft’s length directly in the rolling element area without any constraint. In appropriate designs, the component acts purely as a non-locating bearing and prevents undesirable axial stresses in the overall bearing arrangement.

What is the function of the NU design and C3 clearance?

The combination of a removable inner ring and increased bearing clearance simplifies assembly and design. As the inner ring can be removed from both sides, the inner and outer rings can be mounted separately onto the shaft and in the housing. The slightly increased C3 radial clearance compensates for the reduction in bearing clearance caused by operation, either when tight bearing seats are selected or when temperature differences occur between the inner and outer rings during operation.