Four Point Contact B. FAG QJ216 -MPA

The FAG QJ216-MPA four-point bearing, measuring 80 × 140 × 26 mm, accommodates high axial forces in both directions whilst requiring minimal installation space.

The QJ216-MPA four-point bearing is a special radial ball bearing whose raceways are designed to transmit high axial forces in both directions. With an inner diameter of 80 mm, an outer diameter of 140 mm and a width of 26 mm, this rolling bearing requires less axial installation space than a combination of two angular contact ball bearings. The FAG bearing has a standard radial clearance and operates within a temperature range of -30 to +150 degrees Celsius.

In which installation scenarios does the QJ216-MPA four-point bearing accommodate axial loads?

This bearing is primarily used where varying axial loads occur and precise axial guidance is required. Typical designs frequently utilise four-point bearings as pure axial bearings, in which the outer ring is radially unsupported within the housing. In this case, radial forces are absorbed by a separate radial bearing. In designs where space is limited, this design offers a compact solution for defined axial load conditions without the need for complex shaft supports.

What are the advantages of a brass cage and a split inner ring?

The split inner ring design simplifies assembly, as the bearing is not self-retaining. The outer ring with ball race and the two inner ring halves can be mounted independently of one another onto the shaft and housing. The robust brass cage guides the rolling elements with minimal vibration and withstands mechanical loads. As this is an open bearing without a groove in the outer ring, you will need to provide for an external housing seal and a lubricant supply.