4311 ATN9
Double Row Deep Groove Ball Bearings
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4311 ATN9 Bearing Product Overview & Core Advantages
The 4311 ATN9 is a double row angular contact ball bearing designed for demanding applications requiring high rigidity and reliable performance under combined loads. This metric bearing features an open design without seals, optimized for applications where external sealing is provided. Its double row construction provides exceptional stiffness and can accommodate significant radial loads along with axial loads in both directions. Manufactured to ABEC-1 precision standards with C0 radial clearance, this bearing delivers consistent performance in industrial environments requiring dependable operation.
Model Code Detailed Breakdown
| Code Segment | Technical Meaning |
| 4311 | Basic bearing designation indicating bore diameter of 55mm, outside diameter of 120mm, and width of 43mm |
| A | Contact angle optimized for combined load capacity |
| TN9 | Nylon cage material providing excellent high-speed performance and reduced friction |
4311 ATN9 Bearing Structural Features & Performance Benefits
High Rigidity Design: The double row construction provides superior stiffness compared to single row bearings, making it ideal for applications requiring minimal deflection under heavy loads. This design enhances system stability and precision.
Exceptional Load Capacity: With a dynamic load rating of 21,938 lbf and static load rating of 18,675 lbf, this bearing handles substantial combined radial and axial loads efficiently. The optimized contact angle ensures balanced load distribution across both rows.
High-Speed Performance: The nylon cage (TN9) enables smooth operation at limiting speeds up to 9,000 rpm, reducing centrifugal forces and maintaining stability during high-speed rotation.
Precision Engineering: Manufactured to ABEC-1 tolerance class with controlled radial internal clearance (C0: 0.008-0.028mm), ensuring consistent performance and extended service life in precision applications.
4311 ATN9 Bearing Typical Application Areas
The 4311 ATN9 double row angular contact ball bearing is ideally suited for:
- Industrial Gearboxes and power transmission systems
- Machine Tool Spindles requiring high rigidity and precision
- Material Handling Equipment with combined load requirements
- Industrial Pumps and compressor applications
- Agricultural Machinery and heavy-duty equipment
- Construction Equipment components requiring reliable bearing performance
