Four Point Contact B. FAG QJ230 -N2-MPA

The FAG QJ230 -N2-MPA four-point bearing, with a 150 mm bore, brass cage and split inner ring, can accommodate high axial forces in both directions.

The FAG QJ230 -N2-MPA four-point bearing is an open radial ball bearing with main dimensions of 150 × 270 × 45 mm. Thanks to the split inner ring and the specific raceway geometry, the design functions primarily as a double-acting axial bearing with a narrow axial width. Featuring standard radial clearance, a brass cage and the standard tolerance class P0/PN (ABEC 1), this component is suitable for demanding industrial applications. The open design allows for lubrication tailored to the temperature range of -30 to +200 degrees.

What is the QJ230 -N2-MPA four-point bearing suitable for?

This bearing is primarily designed to accommodate axial forces in both directions when the axial installation space is too narrow for double-row angular contact ball bearings. Design engineers often combine the four-point bearing with a separate radial bearing, with the outer ring fitted with radial clearance to accommodate purely axial loads. Thanks to the brass cage and the wide temperature range from –30 to +200 degrees, the design is suitable for bearing arrangements subject to thermal and mechanical stress with purely axial forces.

What is the function of the retaining grooves and the split inner ring in the QJ230 -N2-MPA?

The split inner ring allows for a greater number of rolling elements and simplifies assembly, as the inner ring halves and the outer ring can be fitted separately. The two retaining grooves in the outer ring (-N2), offset by 180 degrees, are designed to secure the outer ring against rotation using pins on the housing side. As an open bearing without an integrated seal, protection against contamination is provided by the surrounding housing structure, whilst the lubricant supply is tailored to the respective operating cycles.