71906 ACD/PA9ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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71906 ACD/PA9ADBB Bearing Product Overview & Core Advantages
The 71906 ACD/PA9ADBB is a precision angular contact ball bearing designed for high-performance applications requiring exceptional rigidity and accuracy. This duplex back-to-back (DB) matched set is preloaded to Light / Class B specifications, delivering superior system stiffness and minimal runout. Engineered to handle combined loads (radial and axial) simultaneously, its optimized 25° contact angle provides excellent axial load capacity. Manufactured to an ultra-precise PA9A tolerance class, it is ideal for machine tool spindles and other high-speed, high-rigidity applications where rotational accuracy is critical.
71906 ACD/PA9ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71906 | Basic bearing series and size designation (30mm bore, 47mm OD, 18mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates a Duplex (two-bearing) set. |
| DB | Specifics the Back-to-Back mounting arrangement. |
| PA9A | Denotes the ultra-high precision tolerance class. |
71906 ACD/PA9ADBB Bearing Structural Features & Performance Benefits
High Rigidity & System Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and maintains shaft positioning under heavy combined loads.
Superior Precision & Running Accuracy: Manufactured to PA9A tolerance class with tight dimensional control on bore, outside diameter, and width, ensuring minimal vibration and precise rotational performance.
Optimized High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, while the 25° contact angle offers a balanced design for high-speed operation, with a limiting speed of 83,000 rpm.
Enhanced Load Capacity: The angular contact design and duplex preload enable the bearing set to handle significant radial (2498 lbf dynamic) and axial loads simultaneously.
Material & Lubrication: Constructed from chrome steel for rings and balls, providing high durability and fatigue resistance. The bearing is pre-lubricated for immediate operation.
71906 ACD/PA9ADBB Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and milling heads.
- Precision Instrumentation: High-accuracy measuring devices and optical equipment.
- High-Speed Motors: Spindles for PCB drilling and other precision motor applications.
- Robotics: High-rigidity joints and precision actuator systems.
