Four Point Contact B. SKF QJ213 MA

The SKF QJ213 MA four-point bearing, with a 65 mm bore and a split inner ring, accommodates axial forces in both directions in a confined space.

The QJ213 MA four-point bearing is a single-row radial angular contact ball bearing in a compact design. The design accommodates high axial loads in both directions, whilst radial forces should remain low. SKF manufactures this design in the Explorer performance class with a robust brass cage and standard radial clearance. As an open component, it has no integrated seal and therefore requires appropriate lubrication via the surrounding housing.

What is the QJ213 MA four-point bearing suitable for in operation?

Design engineers primarily use this rolling bearing when axial forces occur in both directions and there is insufficient installation space for two separate angular contact ball bearings. It frequently functions purely as an axial bearing alongside a radial bearing in combined bearing arrangements. In this arrangement, the outer ring is given radial clearance within the housing so that only axial forces are transmitted via the four contact points of the raceways.

What are the advantages of the split inner ring and the tolerance class?

The split inner ring allows a large number of rolling elements to be accommodated. As the rings are not self-retaining, the bearing components are assembled separately. Furthermore, this design offers increased dimensional accuracy to tolerance class P6 and running accuracy to tolerance class P5. The outer ring does not require a retaining groove. Thanks to the solid brass cage, the bearing is suitable for operating temperatures ranging from -30 to +150 degrees.