71911 CD/P4ATBTC
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
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71911 CD/P4ATBTC Bearing Product Overview & Core Advantages
The 71911 CD/P4ATBTC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This triplex matched set is configured in a Back-to-Back (TBT) arrangement, providing superior stability and the ability to withstand combined loads (radial and axial). Manufactured to a P4A tolerance class, it offers high running accuracy and is preloaded for immediate, precise operation. Its compact design and high load capacity make it ideal for high-precision, high-reliability machinery.
71911 CD/P4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71911 | Basic bearing designation indicating a high-precision angular contact bearing series with a 55 mm bore, 80 mm OD, and 39 mm width. |
| C | Specifies a 15° contact angle, optimized for high-speed operation and moderate axial load capacity. |
| D | Indicates a Moderate / Class C preload, providing high rigidity and minimizing axial and radial play for precise shaft positioning. |
| P4A | Denotes a high-precision tolerance class with enhanced dimensional and running accuracy, suitable for the most demanding applications. |
| TBT | Signifies the bearing is supplied as a Triplex Back-to-Back matched set (three bearings). This arrangement provides maximum moment rigidity and stability. |
| C (in TBT*C) | Specifies the universal matching is not applicable; this is a standard matched set. |
71911 CD/P4ATBTC Bearing Structural Features & Performance Benefits
High Rigidity and Stability: The triplex back-to-back (TBT) configuration creates an extremely rigid bearing system, effectively resisting complex moment loads and ensuring precise shaft guidance. The moderate preload (Class C) further enhances this rigidity, eliminating internal clearance for immediate, chatter-free operation.
Superior Load Capacity: As an angular contact bearing, the 71911 CD/P4ATBTC is engineered to handle significant combined radial and axial loads simultaneously. The dynamic and static load ratings of 9360 lbf and 9900 lbf, respectively, ensure reliable performance under demanding conditions.
High-Speed Performance: The 15° contact angle and lightweight phenolic resin cage are optimized for high-speed operation, reducing centrifugal forces and friction. This allows the bearing to achieve its high limiting speed of 34,000 rpm.
Precision and Accuracy: Manufactured to P4A tolerance standards with a narrow bore and outside diameter tolerance of -0.004mm to 0, this bearing guarantees exceptional running accuracy, low vibration, and consistent performance in precision spindles.
71911 CD/P4ATBTC Bearing Typical Application Areas
The 71911 CD/P4ATBTC is ideally suited for high-performance machinery where precision, speed, and rigidity are paramount. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling spindles and high-frequency motor spindles.
- Robotics: High-accuracy robotic arm joints and rotary units.
- Medical Equipment: Dental handpieces and laboratory centrifuges.
- Aerospace Systems: Gyroscopes and navigation instrument rotors.
