Four Point Contact B. SKF QJ224 N2MA/C3

The SKF QJ224 N2MA/C3 four-point bearing (120x215x40 mm) accommodates high axial forces on both sides and features retaining grooves and C3 clearance.

The SKF QJ224 N2MA/C3 four-point bearing is a single-row angular contact ball bearing with a split inner ring. Thanks to its specific raceway geometry, the design supports axial forces in both directions whilst requiring minimal axial installation space. This version features a robust brass cage for demanding guidance applications. As it is an open bearing, the lubricant can be selected to suit the specific application within the system circuit.

What is the QJ224 N2MA/C3 four-point bearing suitable for in practice?

Design engineers primarily use this design to accommodate purely or predominantly axial loads, often in combination with a separate radial bearing. Thanks to the split inner ring, the assembly accommodates a high number of balls to specifically absorb axial loads. Two retaining grooves in the outer ring, offset by 180 degrees, prevent the bearing shell from rotating with the housing, which stabilises operation under varying load directions.

What are the advantages of the brass cage and the C3 bearing clearance?

The C3 designation indicates a slightly increased radial clearance. This increased clearance compensates for thermal expansion when temperature differences occur between the shaft and the housing. The component is suitable for a temperature range of -30 to +150 degrees. The guided brass cage is characterised by high strength. With tolerance class P0 (ABEC 1), the bearing complies with established standard tolerances for mechanical engineering and gearbox construction.