Four Point Contact B. FAG QJ308 -MPA

The FAG QJ308-MPA four-point bearing, measuring 40 × 90 × 23 mm, accommodates high axial forces in both directions whilst requiring minimal axial installation space.

The FAG QJ308-MPA four-point bearing is a single-row angular contact ball bearing with a split inner ring, which accommodates axial forces acting from both directions. With a bore of 40 mm, an outside diameter of 90 mm and a width of 23 mm, this rolling bearing requires less axial installation space than a double-row bearing arrangement. Designed as an open bearing, it can be lubricated directly via the surrounding system. Its use is particularly recommended where axial guidance accuracy is required.

What is the QJ308-MPA four-point bearing suitable for?

This bearing is primarily suitable for applications involving predominantly or purely axial loads in alternating directions. It is frequently used in gearbox and general mechanical engineering as an axial bearing, with the outer ring being given radial clearance within the housing to prevent radial forces. As the outer ring has no groove, the component can be fitted into through-bores in the housing. When combined with separate radial bearings, this model provides precise axial guidance for rotating shafts.

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

The two-piece inner ring allows a large number of balls to be fitted, which structurally enhances the axial load-carrying capacity. Furthermore, this non-self-retaining design facilitates assembly, as you can assemble the outer ring together with the ball cage and the two inner ring halves separately. The guided brass cage maintains a uniform spacing between the rolling elements. Designed with standard radial bearing clearance, this model is suitable for operating temperatures ranging from -30 to +150 degrees.