Four Point Contact B. SKF QJ316 N2MA

The SKF QJ316 N2MA four-point bearing, measuring 80x170x39 mm, accommodates high axial forces in both directions whilst requiring minimal axial installation space.

The QJ316 N2MA four-point bearing is a single-row angular contact ball bearing with a split inner ring in the SKF Explorer design. The design is primarily intended to accommodate axial loads in both directions. With dimensions of 80 mm bore, 170 mm outside diameter and 39 mm width, the bearing requires little axial installation space. A solid brass cage guides the rolling elements precisely. The open bearing is designed for operating temperatures ranging from –30 to +150 degrees Celsius.

In which applications does the QJ316 N2MA four-point bearing prove its worth?

This bearing is primarily used where high axial forces occur within limited installation space. It often functions as a pure axial bearing alongside a separate radial bearing arrangement. Thanks to the split inner ring, the component absorbs axial forces in both thrust directions. As the bearing is not designed to be self-retaining, the inner ring halves and the outer ring can be fitted separately with ball cages. This simplifies installation in housing assemblies.

What is the function of retaining grooves and P6/P5 tolerances?

Two retaining grooves in the outer ring, offset by 180 degrees, prevent the outer ring from rotating within the housing seat. This is relevant when the bearing is mounted purely as a guide bearing with radial housing clearance. Manufacturing to P6 dimensional accuracy and P5 running accuracy ensures low runout errors and low-vibration operation. As an unsealed bearing, the bearing arrangement requires an external lubricant supply as well as housing seals.