7209 CD/QBTAVQ126
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7209 CD/QBTAVQ126 Bearing Product Overview & Core Advantages
The 7209 CD/QBTAVQ126 is a precision quadruplex matched set of angular contact ball bearings designed for applications requiring exceptional stiffness and high load capacity. This metric system bearing features an open seal type and is preloaded to Extra Light / Class A specifications. Its core advantage lies in the Quadruplex Tandem Back-to-Back (QBT) arrangement, which provides maximum rigidity and can accommodate combined radial and axial loads simultaneously. Manufactured to a P4A tolerance class, it is engineered for high-precision, high-reliability machinery where dimensional stability and running accuracy are paramount.
7209 CD/QBTAVQ126 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7209 | Basic bearing series and size designation (45mm bore, 85mm OD). |
| CD | Indicates a duplex bearing with a specific internal clearance and preload. |
| QBT | Defines the matched arrangement as Quadruplex Tandem Back-to-Back. |
| AVQ126 | Manufacturer-specific code for the precision matching and preload specification of the quadruplex set. |
7209 CD/QBTAVQ126 Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The Quadruplex Tandem Back-to-Back (QBT) arrangement of four bearings creates an extremely rigid system, capable of supporting high radial dynamic load ratings of 25,200 lbf and radial static load ratings of 28,125 lbf. This configuration is optimal for managing heavy combined loads.
- Precision & High-Speed Performance: Manufactured to P4A tolerance class with a 15° contact angle, this set ensures exceptional running accuracy. The phenolic cage and optimized internal geometry contribute to stable operation at high speeds, with a limiting speed of 41,000 rpm.
- Superior Material & Construction: Both rings and balls are made from chrome steel for high durability and fatigue resistance. The set comes pre-lubricated, ensuring immediate operational readiness and protection during the initial run-in period.
7209 CD/QBTAVQ126 Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is ideally suited for demanding applications in:
- Machine Tool Spindles: Providing the necessary stiffness and accuracy for high-speed milling, grinding, and turning centers.
- High-Frequency Spindles: Used in PCB drilling and precision engraving machines where extreme rotational accuracy is critical.
- Precision Rotary Tables: Ensuring minimal deflection and high positional accuracy in indexing and positioning systems.
- Aerospace & Defense Systems: Applications requiring reliable performance under significant loads and stringent precision requirements.
