Four Point Contact B. FAG QJ320 -N2-MPA

The FAG QJ320 -N2-MPA four-point bearing, measuring 100 × 215 × 47 mm, accommodates high axial forces in both directions whilst requiring minimal installation space.

The FAG QJ320 -N2-MPA four-point bearing is a single-row rolling bearing designed for demanding industrial applications. It has a bore of 100 mm, an outside diameter of 215 mm and a width of 47 mm. Thanks to its specific raceway geometry, the bearing accommodates axial loads in both directions. Typical applications are found in general mechanical engineering and gearbox construction, where the axial installation space is insufficient for two separate angular contact ball bearings.

What is the QJ320 -N2-MPA four-point bearing suitable for in gearbox construction?

This four-point bearing is primarily used when axial forces act from two directions. The split inner ring allows a large number of rolling elements to be incorporated, which enhances the axial load-carrying capacity. The bearing is often used purely as an axial bearing in combination with a separate radial bearing. In such an arrangement, the outer ring has radial clearance within the housing. This design saves axial installation space and keeps the shaft axially fixed.

What is the function of the retaining grooves and the brass cage?

The -N2-MPA version has two retaining grooves in the outer ring, offset by 180 degrees. These grooves accommodate retaining pins and act as an anti-rotation device to prevent the outer ring from moving within the housing seat. The brass cage guides the rolling elements and is suitable for operating temperatures ranging from –30 to +150 degrees Celsius. As an open bearing with standard radial clearance and tolerance class P0/PN or ABEC 1, this design requires an external lubrication supply via oil or grease in the adjacent structure.