Four Point Contact B. SKF QJ236 N2MA

The SKF QJ236 N2MA four-point bearing accommodates high axial forces in both directions whilst maintaining compact dimensions of 180 × 320 × 52 mm.

The QJ236 N2MA four-point bearing belongs to the radial angular contact ball bearing family and is specifically designed for applications where axial forces occur in both directions. With a bore of 180 mm, an outside diameter of 320 mm and a width of 52 mm, this rolling bearing requires less axial installation space than double-row bearing arrangements. The SKF Explorer version offers optimised running characteristics. A solid brass cage guides the rolling elements at temperatures ranging from –30 to +200 degrees.

What is the QJ236 N2MA four-point bearing suitable for?

This design is primarily used in industrial gearboxes and drive systems where varying axial loads are present. Designers frequently use four-point bearings as pure axial bearings in combination with a separate radial bearing. The split inner ring allows for a high number of balls to be accommodated. As the bearing is designed as an open variant, it is integrated directly into oil- or grease-lubricated housings, allowing lubricants to reach the raceways unhindered.

What is the function of the retaining grooves and the split inner ring?

The two retaining grooves in the outer ring, offset by 180 degrees, serve to secure the bearing against unwanted rotation within the housing by means of keyways or pins. This is particularly important when the outer ring is fitted with radial clearance. The split inner ring allows you to mount the bearing rings separately onto the shaft. With tolerance class P6 for dimensional accuracy and P5 for running accuracy, the bearing meets high standards for concentricity and guidance precision with normal radial bearing clearance.