SKF
Four-Point Contact Ball Bearings
Four-point contact ball bearings are single-row angular contact bearings with a unique raceway design that enables them to carry axial loads in both directions and a limited radial load, using a single bearing. The inner and outer rings each have two raceways that contact the balls at four points, hence the name. This makes them an excellent space-saving alternative in applications where axial space is at a premium. SKF four-point contact bearings have a split inner ring to allow a large number of balls, increasing load capacity. They are often used in combination with radial bearings (e.g., cylindrical roller bearings) where the four-point bearing solely carries axial load, providing a locating bearing function. Typical applications include gearboxes, compressors, and processing machinery. SKF offers these in open and sealed designs, with brass or polyamide cages.
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Bidirectional Axial Load with One Bearing
Replaces a pair of angular contact bearings, freeing axial space.
High Axial Load Capacity
Large number of balls due to split inner ring design.
Low Friction at High Speeds
Even at high speeds, four-point contact yields modest friction torque.
Locating Bearing Function
Provides positive axial location when paired with a radial bearing (e.g., NU series).
Sealed Versions Available
Integrated seals protect against contamination in harsh environments.
Separable Design
Split inner ring simplifies mounting and dismounting.
How Four-Point Contact Bearings Save Space in Gearboxes
In high-pressure gearboxes, the absence of a second angular contact bearing reduces the shaft length significantly, enabling more compact housing and lighter structure. The bearing accommodates thrust reversals often encountered in bevel gears. SKF’s QJ series is widely used in such applications.
Four-Point Contact Bearings vs. Double Row Angular Contact
While both handle bidirectional thrust, four-point contact bearings typically have higher axial stiffness and are lighter. However, they cannot simultaneously carry high radial load, so a separate radial bearing (e.g., cylindrical roller) must support radial forces. The double row angular contact can manage both but is wider.