71909 CDGB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71909 CDGB/P4A Bearing Product Overview & Core Advantages
The 71909 CDGB/P4A is a single-row angular contact ball bearing engineered for applications requiring exceptional precision and high-speed performance. Manufactured to P4A tolerance class, this bearing delivers superior running accuracy and rotational stability. Its defining capability is supporting combined loads—significant radial loads alongside unidirectional axial loads—making it ideal for high-rigidity, high-reliability systems. The bearing comes pre-lubricated and features a phenolic cage and universal matchable (SU) design, enabling flexible mounting arrangements in demanding precision equipment.
71909 CDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71909 | Basic bearing series and size designation (45mm bore, 68mm OD, 12mm width). |
| C | Specifies a 15° contact angle, optimized for high-speed operation. |
| DG | Indicates the bearing is part of a Universal Matchable (SU) pair or set. |
| B | Denotes a Light preload (Class B) for reduced deflection and enhanced rigidity. |
| P4A | The tolerance class, signifying very high precision for dimensional and running accuracy. |
71909 CDGB/P4A Bearing Structural Features & Performance Benefits
High Rigidity and Precision: The single-row angular contact design, combined with a light preload (Class B), provides high axial and radial rigidity, minimizing deflection under load for precise shaft positioning.
Superior Load Capacity: With a 15° contact angle and optimized internal geometry, the bearing efficiently handles combined radial and axial loads in one direction.
Exceptional High-Speed Performance: The lightweight phenolic resin cage ensures stability and low friction at high rotational speeds, supporting a limiting speed of 41,000 rpm.
Universal Matching Capability (SU): The Universal Matchable (SU) designation means bearings can be mounted in pairs (back-to-back, face-to-face, or tandem) without selective assembly, simplifying installation and achieving desired preload or rigidity.
71909 CDGB/P4A Bearing Typical Application Areas
The 71909 CDGB/P4A is ideally suited for high-precision, high-speed machinery, including:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Industrial Pumps and Compressors
- Aerospace Control Systems
