Four Point Contact B. FAG QJ306 -MPA

The FAG QJ306-MPA four-point bearing, with dimensions of 30 × 72 × 19 mm, offers a compact design for accommodating axial forces in both directions.

The QJ306-MPA four-point bearing is a special radial ball bearing which, thanks to its raceway geometry, accommodates high axial forces in both directions. As an open bearing from the FAG rolling bearing range, this design features a split inner ring and a guided brass cage. With a bore of 30 mm, an outside diameter of 72 mm and a width of 19 mm, this rolling bearing requires less axial installation space than a combination of two angular contact ball bearings.

What is the QJ306-MPA four-point bearing suitable for?

This type of bearing is primarily used where alternating or predominantly axial loads occur and axial installation space is limited. In gearbox construction, this design is frequently used as a pure axial bearing, in which the outer ring is left unsupported radially, whilst separate radial bearings absorb the transverse forces. As the outer ring is manufactured without a groove, it is secured in the housing via the fit of the cylindrical outer surface.

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

The split inner ring allows a large number of rolling elements to be fitted and facilitates assembly. Both ring halves, as well as the outer ring with ball race, can be fitted separately onto the shaft and housing. The brass cage guides the balls and is suitable for operating temperatures ranging from -30 to +150 degrees. The bearing is manufactured with standard radial clearance and to tolerance class P0/PN or ABEC 1.