Cylindrical Roller Bearings SKF NJ311 ECJ/C3

The SKF NJ311 ECJ/C3 cylindrical roller bearing with a 55 mm bore offers high radial load capacity and axial guidance in one direction.

The NJ311 ECJ/C3 cylindrical roller bearing is a single-row roller bearing with an optimised internal design for demanding industrial applications. With key dimensions of 55 mm inside diameter, 120 mm outside diameter and 29 mm width, this design is suitable for assemblies subject to high radial forces. SKF manufactures this open bearing without a seal, which allows for direct integration into existing oil or grease lubrication circuits. The sheet steel cage guides the cylindrical rolling elements between the raceways.

What is the NJ311 ECJ/C3 cylindrical roller bearing suitable for in operation?

Typical applications include shaft mountings where dominant transverse forces need to be absorbed. As a support bearing, this NJ design accommodates not only radial loads but also axial forces from one direction. In the opposite direction, the bearing allows axial displacement of the shaft within the housing. Designs make specific use of this property to compensate for operational thermal expansion of shafts without constraint, without generating stress in the system.

What do the NJ design and C3 clearance mean during assembly?

The NJ design is characterised by two fixed flanges on the outer ring and one fixed flange on the inner ring. This allows the inner ring to be removed from one side, which facilitates separate pressing onto the shaft and housing. The slightly increased radial clearance C3 serves to compensate for dimensional changes in press fits or temperature differences between the inner and outer rings. The permissible temperature range is from -30 to +150 degrees Celsius.