Cylindrical Roller Bearings SKF NJ321 ECJ

The SKF NJ321 ECJ cylindrical roller bearing accommodates high radial loads and provides single-sided axial support for shafts measuring 105 × 225 × 49 mm.

The SKF NJ321 ECJ cylindrical roller bearing is a single-row roller bearing with an optimised internal design for industrial applications. With a bore of 105 mm, an outer diameter of 225 mm and a width of 49 mm, this bearing transmits high radial loads via the line contact of the rollers. The outer ring is designed without a groove or lubrication bore. The open design without seals allows for direct lubrication via the housing and covers a temperature range from -30 to +150 degrees.

What loads can the NJ321 ECJ cylindrical roller bearing accommodate?

This bearing is used in shaft mountings where high radial forces are combined with single-sided axial guidance. As a support bearing, the NJ design accommodates not only radial loads but also axial forces from one direction. The integrated sheet steel cage maintains an even spacing between the cylindrical rollers. This design features a standard radial clearance and is suitable for standard installation conditions in mechanical engineering.

What function does the NJ design fulfil as a support bearing?

The NJ design has 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 the separate assembly of both bearing rings. The design allows for axial displacement of the shaft in one direction, whilst the fixed flange edge provides axial support for the shaft. The dimensional accuracy complies with tolerance class P0/PN (ABEC 1), and the running accuracy is to P6 (ABEC 3).