Four Point Contact B. FAG QJ313 -MPA

The FAG QJ313-MPA four-point bearing, with a 65 mm bore and a brass cage, provides a space-saving solution for accommodating axial loads in both directions.

The QJ313-MPA four-point bearing belongs to the group of radial rolling bearings and primarily accommodates axial forces in both directions. Thanks to the split inner ring, the design accommodates a large number of rolling elements, which increases the axial load-carrying capacity compared to deep-groove ball bearings. Designed as an open bearing, the bearing mounting requires an external lubricant supply and a suitable housing seal. FAG manufactures this model with a guided brass cage for demanding operating conditions.

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

Design engineers prefer to use this bearing where alternating or purely axial forces occur within a limited axial installation space. Typical applications include bearing arrangements with a predominant axial load, often in direct combination with a separate radial bearing. When the four-point bearing is used purely as an axial bearing, the outer ring is given radial clearance within the housing to ensure that no unwanted radial forces act on the rolling elements. When arranged appropriately, this design guides shafts precisely in the axial direction.

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

The two-piece inner ring simplifies assembly considerably. As the components are not self-retaining, the outer ring, together with the ball cage, and the two inner ring halves are mounted separately onto the shaft and housing. The solid brass cage is characterised by high strength and thermal resistance. In conjunction with the standard radial bearing clearance, the bearing covers a wide temperature range from –30 to +150 degrees. Manufacture to tolerance class P0 or ABEC 1 defines standardised mounting dimensions.