71906 CD/P4ADBB
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
71906 CD/P4ADBB Bearing Product Overview & Core Advantages
The 71906 CD/P4ADBB is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and rigidity. This duplex back-to-back (DB) matched set is preloaded to Light / Class B specifications, providing superior system stiffness and rotational accuracy. Its primary advantage lies in its ability to handle combined loads—significant radial and axial loads from both directions—simultaneously. Manufactured to a P4A tolerance class, it is engineered for high-speed operation and high-reliability scenarios where precision is paramount.
71906 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71906 | Basic bearing designation, indicating a high-precision angular contact bearing series with a 30 mm bore, 47 mm OD, and 18 mm width. |
| C | Designates a 15° contact angle, optimized for high-speed performance and moderate axial load capacity. |
| D | Indicates the bearing is part of a duplex pair (a matched set of two bearings). |
| P4A | Specifies the tolerance class, denoting very high precision levels for dimensional and running accuracy. |
| DB | Specifies the matched arrangement as Back-to-Back (DB). This configuration provides high moment rigidity and excellent stability under complex loads. |
| B | Indicates the preload level is Light / Class B. |
71906 CD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & System Stability: The duplex back-to-back (DB) arrangement of two preloaded bearings creates a statically determinate bearing system. This configuration significantly increases the overall rigidity of the assembly, making it exceptionally resistant to moment loads and operational deflection.
Superior Load Capacity: The angular contact design with a 15° contact angle enables the bearing set to efficiently support combined radial and axial loads from both directions. The light preload (Class B) eliminates internal clearance, ensuring precise shaft positioning and improved load distribution.
High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces and reduces friction, contributing to a high limiting speed of 100,500 rpm. The open design and factory-applied lubrication facilitate efficient heat dissipation.
Precision & Accuracy: Manufactured to P4A tolerance class with tight dimensional control on the bore diameter, outside diameter, and width, this bearing ensures minimal runout and vibration for smooth, precise operation.
71906 CD/P4ADBB Bearing Typical Application Areas
This high-precision duplex bearing set is ideally suited for applications demanding extreme accuracy, high speed, and rigid support. Key industries and equipment include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Gearboxes & Transmission Systems
- High-Frequency Motors and Spindles
- Medical and Dental Equipment
- Robotics and Automation Arms
- Aerospace Actuation and Control Systems
