Cylindrical Roller Bearings SKF NUP224 ECJ

The SKF NUP224 ECJ single-row cylindrical roller bearing with a 120 mm bore acts as a fixed bearing for high radial loads and axial guidance on both sides.

This rolling bearing combines an optimised internal design with main dimensions of 120 × 215 × 40 mm. As an open, single-row cylindrical roller bearing, it primarily accommodates heavy radial loads. Thanks to the NUP design, featuring fixed flanges on the outer ring and a fixed flange with a loose flange disc on the inner ring, the component secures the shaft in both axial directions. A sheet steel cage guides the cylindrical rollers evenly and enables operation within a temperature range of -30 to +150 degrees Celsius.

What is the NUP224 ECJ cylindrical roller bearing suitable for?

This design is used in bearing arrangements subject to high radial loads where simultaneous axial guidance of the shaft on both sides is required. Wherever rigid bearing arrangements are required and transverse forces as well as axial guidance forces in the longitudinal direction occur, the NUP design serves as a fixed bearing. The line contact of the cylindrical rollers ensures high rigidity in the system, whilst the optimised internal design reduces edge stresses under load.

What are the key considerations for the NUP design and open configuration?

As this is an unsealed bearing, the surrounding housing design determines the lubrication and protection against foreign particles. External seals protect the raceways from contamination and ensure that grease or oil remains within the system. This design features standard radial bearing clearance and dimensional accuracy to P0/PN (ABEC 1) with increased running accuracy to P6 (ABEC 3). During installation, care must be taken to ensure the loose flange is correctly positioned on the inner ring so that the double-sided axial guidance functions as intended.