Four Point Contact B. SKF QJ319 N2MA

The SKF QJ319 N2MA four-point bearing (95x200x45 mm) accommodates axial forces in both directions whilst requiring minimal axial installation space.

The SKF QJ319 N2MA four-point bearing is a single-row radial ball bearing with a split inner ring, designed to accommodate high axial loads in both directions. With key dimensions of a 95 mm bore, 200 mm outer diameter and 45 mm width, this rolling bearing requires less axial installation space than a double-row bearing arrangement. As an open bearing in the Explorer design, it features a brass cage. Designs subject to alternating axial loads benefit from the compact design of this bearing type.

In which installation situations is the QJ319 N2MA four-point bearing used?

This bearing is particularly suitable for bearing locations where high axial loads occur in varying directions. The four-point bearing often functions as a pure axial bearing in combination with a separate radial bearing. Thanks to the split inner ring, the row of balls absorbs high forces whilst the shaft remains axially fixed. The open design without an integrated seal allows direct connection to existing lubrication systems within the housing.

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

The designation N2MA indicates two retaining grooves in the outer ring, offset by 180 degrees, as well as a brass cage. The grooves accommodate customer-supplied retaining pins, which are designed to prevent the outer ring from rotating within the housing. Thanks to the split inner ring, the inner ring halves and the outer ring can be fitted separately with the ball races. With tolerance class P6 for dimensional accuracy and P5 for running accuracy, the bearing is suitable for designs with increased requirements for concentricity and guidance accuracy.