71911 CD/P4ADBC
71900 Series Super Precision Angular Contact Ball Bearings
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71911 CD/P4ADBC Bearing Product Overview & Core Advantages
The 71911 CD/P4ADBC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement provides superior stability and is preloaded to a Moderate / Class C level, ensuring minimal axial and radial play under operating conditions. Its primary advantage lies in its ability to handle combined loads (radial and axial) simultaneously with high precision, making it ideal for high-speed spindles and other precision machinery where high rigidity and running accuracy are paramount.
71911 CD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71911 | Basic bearing designation (55mm bore, 80mm OD, 26mm width) |
| C | 15° contact angle |
| D | Duplex Back-to-Back (DB) matched arrangement |
| P4A | High precision tolerance class (equivalent to ABEC 7) |
| DB | Duplex Back-to-Back arrangement (reiterated for clarity) |
| C | Moderate preload (Class C) |
71911 CD/P4ADBC Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide effective spread between load centers, significantly increasing moment rigidity and providing exceptional operational stability, which is critical for precision machining applications.
Optimized Load Capacity: With a 15° contact angle, this bearing is engineered to support substantial combined radial and axial loads. The dynamic load rating of 7020 lbf and static load rating of 6525 lbf ensure reliable performance under demanding conditions.
High-Speed Performance: The phenolic cage offers excellent strength-to-weight ratio and operates smoothly at high speeds, contributing to the bearing's limiting speed of 34,000 rpm. This makes it a true high-speed bearing solution.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls (bore and OD tolerance: -0.004mm to 0), this bearing guarantees precise running accuracy and consistent performance in precision spindles.
71911 CD/P4ADBC Bearing Typical Application Areas
This precision duplex bearing is specifically designed for high-performance applications including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers
- Precision Spindles: PCB drilling, engraving machines, and high-frequency motor spindles
- Industrial Robotics: High-accuracy robot arm joints and rotary tables
- Medical Equipment: Dental handpieces and surgical tool rotors
- Aerospace Systems: Gyroscopes and navigation instrument assemblies
