Cylindrical Roller Bearings SKF NJ324 ECJ

The SKF NJ324 ECJ cylindrical roller bearing is a single-row support bearing measuring 120 × 260 × 55 mm, designed for high radial loads and single-sided axial guidance.

The SKF NJ324 ECJ cylindrical roller bearing supports shafts with a diameter of 120 mm under high radial forces. As an NJ-type support bearing, this roller bearing features two fixed flanges on the outer ring and one flange on the inner ring. This design enables the bearing to accommodate not only high radial loads but also axial forces from one direction. The inner ring can be removed from one side, which facilitates the separate installation of the inner and outer rings in the housing.

In which bearing arrangements is the NJ324 ECJ cylindrical roller bearing used?

This rolling bearing primarily withstands very high radial forces and guides the shaft axially in one direction. The NJ support bearing design allows axial thermal expansion of the shaft in the opposite direction to be compensated for without constraint. The Explorer version, with its optimised internal design, is designed to withstand demanding mechanical loads during continuous operation.

What is the function of the sheet steel cage and the P6 tolerance class in the NJ324 ECJ?

The sheet steel cage, identified by the suffix ECJ, guides the rollers and withstands operating temperatures ranging from –30 to +150 degrees Celsius. The bearing combines standard dimensional accuracy to P0 or ABEC 1 with higher running accuracy to class P6 (ABEC 3). This tighter running tolerance reduces radial runout errors during operation. Due to the open design without an integrated seal, sealing is achieved via the housing environment, combined with an external supply of lubricating oil or grease.