71909 CDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 71909 CDGA/P4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and reliability. As a single bearing with Universal Matchable (SU) designation, it can be paired with other bearings to form a precisely preloaded set. Its key characteristics include the ability to handle combined loads (radial and axial), superior running accuracy from its P4A tolerance class, and high-speed capability enabled by its phenolic cage and optimized design. This bearing is engineered for high rigidity and stable performance in precision machinery.
71909 CDGA/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) |
| CD | Contact angle of 15° |
| G | Preload level: Extra light (Class A) |
| A | Universal Matchable bearing, can be mounted in any combination |
| /P4A | Tolerance class: P4A (high precision grade) |
Structural Features and Performance Benefits
High Precision and Rigidity: Manufactured to P4A tolerance class with extremely tight dimensional tolerances, this bearing ensures minimal runout and vibration, providing superior rotational accuracy and high rigidity for precision applications.
Optimized Load Capacity: With a 15° contact angle, the 71909 CDGA/P4A efficiently handles combined radial and axial loads. The dynamic load rating of 2925 lbf and static load rating of 2138 lbf demonstrate its robust load-carrying capability.
High-Speed Performance: The phenolic cage contributes to excellent high-speed performance, allowing operation up to 41,000 rpm. This material offers good strength-to-weight ratio and operates smoothly at high velocities.
Universal Matching Capability: As a Universal Matchable (SU) bearing, it can be mounted in any combination (back-to-back, face-to-face, or tandem) with other identical bearings to create precisely preloaded sets, offering flexibility in application design.
71909 CDGA/P4A Bearing Typical Application Areas
The 71909 CDGA/P4A precision bearing is ideally suited for:
- Machine tool spindles and high-precision machining centers
- High-speed spindles for grinding, milling, and drilling applications
- Precision robotic systems and automation equipment
- Medical equipment and dental handpieces
- Aerospace instrumentation and control systems
- High-frequency motors and precision gearboxes
