3311 ATN9
Double Row Angular Contact Ball Bearings
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3311 ATN9 Bearing Product Overview & Core Advantages
The 3311 ATN9 is a double row angular contact ball bearing designed for applications requiring high precision and exceptional rigidity. This precision bearing excels at simultaneously handling combined radial and axial loads from both directions. Its compact design, featuring optimized internal geometry, makes it ideal for high-reliability machinery where space is at a premium and operational stability is critical.
3311 ATN9 Bearing Model Code Explained, Specifications & Naming Convention
- 3311: Basic designation indicating a metric series double row angular contact ball bearing with a 55mm bore.
- A: Signifies a 30° contact angle, optimized for carrying higher axial loads.
- TN9: Denotes a cage made of glass fiber reinforced polyamide (Nylon), contributing to lower friction, reduced weight, and superior performance at high speeds.
3311 ATN9 Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The double row design provides a significantly wider supporting surface than single row bearings, resulting in exceptional rigidity and stability under complex load conditions. This construction enables it to sustain substantial combined loads and bidirectional thrust forces.
Optimized High-Speed Performance: The lightweight and robust TN9 polymer cage minimizes centrifugal forces, reduces friction, and ensures smooth operation, allowing the bearing to achieve its high limiting speed of 5,300 rpm.
Precision & Reliability: Manufactured to P6 (ABEC-3) tolerance class, this bearing guarantees precise running accuracy and consistent performance. The open design, when used with appropriate lubrication systems, facilitates efficient heat dissipation.
3311 ATN9 Bearing Typical Application Areas
The 3311 ATN9 is ideally suited for demanding applications across various industries, including:
- Machine Tool Spindles
- Industrial Pumps and Compressors
- Gearboxes and Transmission Systems
- Precision Agricultural and Construction Equipment
