Four-Point Contact Ball Bearings

What Are Four-Point Contact Angular Contact Ball Bearings?
Four-point contact angular contact ball bearings are single-row radial bearings designed with uniquely shaped raceways that allow them to support axial loads in both directions. The internal geometry splits the contact angle into two points per raceway, enabling these bearings to carry thrust loads from either side—unlike traditional angular contact bearings that support axial load in only one direction.

Design and Load Characteristics
The inner ring is typically split into two halves to enable a four-point contact structure, where each ball contacts the raceways at two distinct locations. This design enables:

Axial load support in both directions
Limited radial load support when axial load is present
Compact and space-saving configuration ideal for combined load scenarios

Key Features

Bidirectional axial load capacity: Supports axial forces from either side.
Four-point contact geometry: Enhances stability under complex load conditions.
Space efficiency: Replaces two single-direction bearings in certain applications.
Load ratio consideration: Able to carry some radial load when under axial load.
Interchangeability: Compatible with SKF and other major bearing brands.

Typical Applications
Due to their unique load-handling characteristics, four-point contact angular contact ball bearings are widely used in applications requiring simultaneous bi-directional thrust support with minimal radial forces:

Rotary tables
Industrial gearboxes
Robotic arms and joints
Turntables in machine tools
Automated assembly systems

Advantages Over Conventional Bearings

Eliminates need for paired bearings in axial load applications
Reduces assembly time and space requirements
Improves cost-efficiency and simplifies design

Interchangeability with SKF
These four-point contact ball bearings are fully interchangeable with SKF models, provided the dimensions and load ratings align with your application requirements. This ensures flexibility in procurement and maintenance across global supply chains.

Conclusion
Four-Point Contact Angular Contact Ball Bearings offer a compact and efficient solution for applications requiring axial load handling in both directions. Their unique geometry provides performance advantages in precision machinery, robotics, and rotational systems where axial stability is critical and space is limited.