71911 ACD/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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71911 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 71911 ACD/P4ADBB 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 stiffness and moment load capacity, making it ideal for high-precision spindles and machinery. Manufactured to P4A tolerance class with a light preload (Class B), it ensures smooth operation, minimal runout, and reliable performance under combined radial and axial loads. The phenolic cage and optimized 25° contact angle contribute to its high-speed capabilities and operational stability.
71911 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71911 | Basic bearing series and size designation |
| AC | Angular Contact design with a 25° contact angle |
| D | Duplex (Two bearings in a set) |
| DB | Back-to-Back mounting arrangement |
| P4A | High precision tolerance class (exceeds ABEC 7) |
71911 ACD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & Moment Load Capacity: The duplex back-to-back configuration creates a wide effective spread between load centers, significantly increasing system stiffness and resistance to moment loads, which is critical for machining accuracy.
Optimized for High-Speed Operation: The phenolic resin cage offers excellent strength-to-weight ratio, reduced friction, and superior guidance at high rotational speeds, contributing to the bearing's limiting speed of 34,000 rpm.
Precision Performance: Manufactured to P4A tolerance standards with a light preload, this bearing minimizes axial and radial play, ensuring precise shaft positioning, reduced vibration, and enhanced operational smoothness.
Superior Load Ratings: With a dynamic load rating of 6660 lbf and a static load rating of 6188 lbf, it reliably handles significant combined loads in demanding applications.
71911 ACD/P4ADBB Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring utmost precision and rigidity.
- Precision Rotary Tables: Indexing and positioning systems in CNC machining and measurement equipment.
- High-Frequency Spindles: PCB drilling, engraving, and small tool machining applications.
- Medical Equipment: High-speed dental handpieces and surgical drill spindles.
- Robotics: Precision joints and actuators where accuracy and stiffness are paramount.
