Four Point Contact B. SKF QJ313 MA

The SKF QJ313 MA four-point bearing, measuring 65 × 140 × 33 mm, accommodates high axial forces in both directions within a narrow installation space.

The SKF QJ313 MA four-point bearing is a single-row angular contact ball bearing with a split inner ring, which accommodates axial forces in both directions. Thanks to its dimensions – a 65 mm bore, 140 mm outside diameter and 33 mm width – this bearing is suitable for designs with limited axial installation space. The open bearing design allows for direct lubrication within the machine housing. Combined with its Explorer-quality manufacture, this rolling bearing supports demanding industrial applications in machine and gearbox construction.

What is the QJ313 MA four-point bearing suitable for in practice?

This four-point bearing is particularly suitable for bearing locations where high axial loads from varying directions occur and radial installation space is available. Typical applications include industrial gearboxes and mechanical assemblies subject to combined loads. As the outer ring has no retaining groove, the component can be easily inserted into suitable housing bores. Design engineers frequently use four-point bearings in combination with a pure radial bearing, with the QJ313 MA specifically providing axial guidance.

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

The two-piece inner ring allows for the accommodation of a large number of rolling elements, which increases the axial load capacity. Furthermore, this design facilitates the separate mounting of the outer ring with the ball set and the inner ring halves onto the shaft. The solid brass cage (suffix MA) is characterised by high strength and good emergency running properties. It withstands high accelerations and is suitable for operating temperatures ranging from -30 to +150 degrees. The tolerance class P6 for dimensional accuracy and P5 for running accuracy ensures low-vibration operation.