Angular contact ball bearings, four-point contact ball bearings QJ 1017 N2MA/C4B20 SKF
Four-point contact ball bearings are radial single row angular contact ball bearings with raceways that are designed to support axial loads in both directions.
For a given axial load, a limited radial load can also be supported (Load ratio).
The bearings are separable, i.e. the outer ring with ball and cage assembly can be mounted separately from the two inner ring halves.
Both inner ring halves of SKF Explorer four-point contact ball bearings have a recessed shoulder.
This improves oil flow when the bearing is used in combination with an SKF cylindrical roller bearing.
In addition, these recesses can be used to facilitate dismounting.
The SKF standard assortment of four-point contact ball bearings includes:
bearings in the QJ 2 and QJ 3 series
some sizes in the QJ 10 and QJ 12 series