Double-row ball bearings, also known as double-row deep groove ball bearings, are a type of rolling-element bearing designed to accommodate higher radial loads and axial loads in both directions compared to single-row deep groove ball bearings. They consist of two rows of balls separated by a central rib in the inner and outer raceways. This design allows for increased load-carrying capacity and enhanced stiffness. Here are some key characteristics and features of double-row ball bearings:

1. Increased Load Capacity: Double-row ball bearings can support higher radial loads than their single-row counterparts. The two rows of balls provide more contact points, which distribute the load more effectively.
2. Axial Load Capability: These bearings are designed to handle axial loads in both directions, making them suitable for applications with thrust loads.
3. Improved Stiffness: The presence of the central rib between the two rows of balls enhances the bearing’s overall stiffness, which can be beneficial in applications where rigidity and resistance to deformation are crucial.
4. High-Speed Operation: Double-row ball bearings are suitable for high-speed applications, and their design minimizes heat generation and friction, contributing to efficient operation.
5. Versatility: They are used in various applications, including gearboxes, electric motors, pumps, conveyor systems, and agricultural machinery.
6. Sealed and Shielded Variants: Some double-row ball bearings come with seals or shields to protect against contamination and retain lubrication, making them suitable for harsh or dusty environments.
7. Precision Options: Precision versions of double-row ball bearings are available for applications requiring high accuracy and low noise.

Double-row ball bearings are commonly used in a variety of industries and applications where higher load-carrying capacity and enhanced stiffness are required. Some examples include:

• Conveyor Systems: In rollers and idler pulleys where radial and axial loads must be accommodated.
• Agricultural Machinery: In farm equipment such as combines, tractors, and balers.
• Electric Motors: In various types of electric motors, especially those in heavy machinery.
• Industrial Gearboxes: In gearboxes and transmission systems to handle both radial and axial loads.
• Mining and Construction Equipment: In equipment like crushers, screens, and excavators.

When selecting a double-row ball bearing, consider factors such as load requirements, speed, temperature, and environmental conditions. The specific type and design of double-row ball bearing should be chosen based on the demands of the application.