Four Point Contact B. FAG QJ310 -MPA

The FAG QJ310-MPA four-point bearing accommodates high axial forces in both directions whilst maintaining compact dimensions of 50 × 110 × 27 mm.

This open four-point contact bearing, the QJ310-MPA, combines a space-saving design with the ability to handle combined loads with a predominantly axial component. FAG manufactures this version with a split inner ring and a guided brass cage. Due to the geometry of the raceways, the rolling elements contact the rings at two points under a purely axial load, whilst radial forces are transmitted via four-point contact. The component features standard radial clearance and the standard tolerance class P0/PN (ABEC 1).

What is the QJ310-MPA four-point bearing suitable for?

Design engineers primarily use this design where axial forces acting in both directions need to be accommodated within a confined installation space. The component often functions as a pure axial bearing alongside a separate radial bearing. When axially fixed without radial support in the housing, it specifically absorbs thrust forces in both directions. The permissible temperature range of –30 to +150 degrees allows for use in demanding industrial thermal environments.

What advantages does the split inner ring offer during installation?

The split inner ring allows for a higher number of balls and simplifies assembly. As four-point contact ball bearings are not self-retaining, the outer ring, together with the ball cage, and the two inner ring halves can be fitted separately. During installation, the inner ring halves must be clamped axially against each other to achieve the specified contact angle and ensure proper function. As no seals are integrated, the bearing is usually operated in sealed, externally lubricated housings.