Four Point Contact B. FAG QJ328 -N2-MPA

The FAG QJ328 -N2-MPA four-point bearing accommodates high axial loads in both directions whilst maintaining compact dimensions of 140 × 300 × 62 mm.

The FAG QJ328 -N2-MPA four-point bearing is designed as a special radial angular contact ball bearing to accommodate high axial forces where axial installation space is limited. Fitted with a split inner ring and a solid brass cage, this rolling bearing accommodates axial forces on both sides. With defined key dimensions of 140 mm bore diameter, 300 mm outer diameter and 62 mm width, the unit requires less installation space than two separately paired angular contact ball bearings. The open design without integrated sealing washers allows for direct lubricant supply via the housing system.

What loads does the QJ328 -N2-MPA four-point bearing accommodate?

The bearing is primarily designed for bearing arrangements subject to high axial forces where load directions vary. In many designs, the unit functions purely as an axial guide bearing in combination with a separate radial bearing. The split inner ring enables a high load-carrying capacity to be achieved whilst maintaining stable guidance. The robust brass cage ensures reliable operation even under dynamic loads and vibrations within the permissible temperature range of -30 to +200 degrees.

What is the function of the retaining grooves on the QJ328 -N2-MPA?

The manufacturer-specific suffix ‘N2’ denotes two retaining grooves offset by 180 degrees on one end face of the outer ring. These grooves serve to secure the outer ring against rotation in the housing seat by means of housing-side dowel pins. Such an anti-rotation feature is structurally appropriate when the four-point bearing is installed as a pure axial bearing with a specific amount of radial clearance in the housing. Manufactured to tolerance class P0/PN (ABEC 1) and with standard radial clearance, the bearing can be precisely integrated into existing shaft assemblies.