Four Point Contact B. SKF QJ326 N2MA

The SKF QJ326 N2MA four-point bearing with a 130 mm bore accommodates high axial forces in both directions whilst requiring minimal axial installation space.

The SKF QJ326 N2MA four-point bearing is a radial rolling bearing with a split inner ring, specifically designed for predominantly axial loads in both directions. With key dimensions of a 130 mm bore, 280 mm outside diameter and 58 mm width, this Explorer version offers a compact bearing solution for demanding operating conditions. A solid brass cage guides the rolling elements at temperatures ranging from –30 to +200 degrees. As an open bearing, this version can be flexibly integrated into the customer’s lubrication system.

What is the QJ326 N2MA four-point bearing suitable for in industrial applications?

This rolling bearing is suitable for demanding applications in mechanical engineering where axial forces occur in varying directions. Thanks to the split inner ring, the ball row accommodates high axial loads, whilst the axial installation space is smaller than that of double-row angular contact ball bearings. Design engineers often combine the bearing with a separate radial bearing, so that the four-point contact bearing functions purely as an axial guide bearing. Due to the four-point contact, this design is not intended for purely radial loads.

What advantages do retaining grooves and a split inner ring offer in the QJ326 N2MA?

Two retaining grooves in the outer ring, offset by 180 degrees, counteract unwanted rotation of the outer ring within the bearing housing when fitted with suitable retaining pins. This facilitates installation as a pure axial bearing with radial housing clearance. At the same time, the split inner ring simplifies mounting on the shaft, as the inner ring halves and the outer ring can be fitted separately. Note the increased accuracy to tolerance class P6 for dimensional accuracy and P5 for running accuracy in the case of precision shaft guides.