Four Point Contact B. SKF QJ216 MA

The SKF QJ216 MA four-point bearing, with an 80 mm bore, brass cage and split inner ring, provides precise axial guidance in both directions.

The QJ216 MA four-point bearing is a single-row angular contact ball bearing with a split inner ring, designed to accommodate high axial forces on both sides within a confined installation space. With dimensions of 80x140x26 mm, this open bearing belongs to the SKF Explorer performance class. It features a standard radial clearance and a solid brass cage for demanding operating conditions. As the outer ring has no groove, this rolling bearing is particularly suitable for compact designs where separate axial bearing arrangements are required.

What is the QJ216 MA four-point bearing suitable for in machinery and shaft mountings?

In industrial drives and shaft mountings, the QJ216 MA four-point bearing is primarily used as a pure axial bearing with radial housing clearance. This design accommodates axial loads in both directions, whilst requiring significantly less installation space than double-row bearings. Thanks to the split inner ring, a high number of balls can be fitted, which enhances the axial load-carrying capacity. Under combined loads, an adjacent radial bearing typically absorbs the radial forces, whilst the four-point bearing ensures precise axial shaft guidance.

What are the advantages of a split inner ring and tolerance class P6/P5?

The split inner ring considerably simplifies assembly, as the inner ring halves and outer ring can be fitted separately onto the shaft and housing. With a tolerance class of P6 for dimensional accuracy and P5 for running accuracy, this SKF bearing delivers tighter concentricity than standard bearings. The robust brass cage allows for use in a temperature range from –30 to +150 degrees. When designing the assembly, ensure that the rings are supported on a flat, even surface to prevent misalignment and premature wear.