Cylindrical Roller Bearings SKF NU308 ECJ/C3

The SKF NU308 ECJ/C3 cylindrical roller bearing, as a non-locating bearing with a 40 mm bore, offers high radial load-carrying capacity whilst accommodating thermal length changes in the shaft.

The SKF NU308 ECJ/C3 cylindrical roller bearing, as a single-row roller bearing, withstands high radial loads. Thanks to its optimised internal design and guided sheet steel cage, this design is suitable for demanding industrial applications. As the inner ring has no flanges and can be removed from either side, this design functions purely as a non-locating bearing. It compensates for axial displacement of the shaft relative to the housing without inducing stress within the bearing.

Under what operating conditions is the NU308 ECJ/C3 used as a non-locating bearing?

Design engineers primarily use this design in bearing arrangements where the shaft undergoes operational length expansion. The open bearing without seals is used in assemblies where an external supply of lubricant, such as oil or grease, is provided. With a permissible temperature range of –30 to +150 degrees, the component covers a wide range of operating conditions in mechanical engineering. The outer ring is designed without a groove or lubrication bore.

What are the advantages of the design with C3 bearing clearance?

The suffix C3 indicates a slightly increased radial bearing clearance compared with the standard clearance. This counteracts the risk of the rolling elements becoming jammed when operational heating or tight fits reduce the operating clearance once the bearing is installed. In combination with dimensional accuracy to tolerance class P0 (ABEC 1) and increased running accuracy to P6 (ABEC 3), the roller bearing ensures low-vibration operation under high radial loads.