71911 CDGB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Product Overview and Core Advantages
The 71911 CDGB/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a single bearing with a Universal Matchable (SU) designation, it can be mounted in sets to achieve optimal preload and rigidity. Its key characteristics include a P4A tolerance class for superior running accuracy, a light preload (Class B) for reduced friction and heat generation, and a 15° contact angle optimized for handling combined radial and axial loads simultaneously. This makes it an ideal choice for high-precision, high-reliability spindles and machinery.
71911 CDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71911 | Basic bearing series and size designation (55mm bore, 80mm OD, 13mm width). |
| C | Specifies a 15° contact angle. |
| D | Indicates the bearing is part of a Universal Matchable (SU) set. |
| GB | Signifies a Light Preload (Class B). |
| P4A | Denotes an ultra-high tolerance class with running accuracy superior to ABEC 7/ISO P4. |
Structural Features and Performance Benefits
High-Speed Capability: The combination of an open design, a lightweight phenolic resin cage, and a 15° contact angle enables very high limiting speeds (34,000 rpm), making it suitable for demanding spindle applications.
Super-Precision Performance: Manufactured to P4A tolerance standards with tight dimensional tolerances on the bore, outside diameter, and width, this bearing ensures minimal runout and vibration for exceptional rotational accuracy.
Optimized Load Capacity: The angular contact design is engineered to support significant combined loads (radial and one-direction axial). The universal matching (SU) feature allows multiple bearings to be paired in a back-to-back or face-to-face arrangement to handle bidirectional axial loads and increase system rigidity.
Robust Material Construction: Made from high-grade chrome steel for both rings and balls, the bearing provides high durability and fatigue resistance under demanding operating conditions.
71911 CDGB/P4A Bearing Typical Application Areas
The 71911 CDGB/P4A is predominantly used in high-precision, high-speed machinery where accuracy and reliability are paramount. Key applications include:
- Machine Tool Spindles (e.g., CNC milling, grinding, and turning centers)
- High-Frequency Motors and Spindles
- Precision Robotics and Automation Equipment
- Aerospace and Defense Instrumentation
