71906 CD/P4ADBC
71900 Series Super Precision Angular Contact Ball Bearings
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71906 CD/P4ADBC Bearing Product Overview & Core Advantages
The 71906 CD/P4ADBC is a precision angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement provides superior stiffness and is capable of supporting combined loads, including significant radial and bidirectional axial loads. Manufactured to P4A tolerance class with a moderate preload (Class C), it ensures precise shaft positioning and smooth operation in high-performance machinery. Its compact design and phenolic cage contribute to its suitability for high-speed applications.
71906 CD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71906 | Bearing series and size designation (30mm bore, 47mm OD, 18mm width) |
| CD | Duplex arrangement in Back-to-Back (DB) configuration |
| P4A | High precision tolerance class (equivalent to ABEC 7) |
| DBC | Specific internal design and preload designation (Moderate preload / Class C) |
71906 CD/P4ADBC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back arrangement creates a wide effective spread, significantly increasing system rigidity and moment load capacity. This configuration optimally handles combined radial and axial loads from both directions.
Precision Performance: Manufactured to P4A tolerance standards with tight dimensional controls (bore/OD tolerance: -0.004mm to 0), ensuring minimal runout and vibration for precise applications.
High-Speed Capability: The phenolic resin cage provides excellent strength-to-weight ratio, reducing centrifugal forces and enabling operation at limiting speeds up to 100,500 rpm.
Thermal Stability: The phenolic cage and chrome steel construction maintain dimensional stability across the operating temperature range (-30°C to 110°C).
Optimized Internal Geometry: With a 15° contact angle, 20 precision balls, and factory-applied lubrication, the bearing delivers smooth operation and long service life.
71906 CD/P4ADBC Bearing Typical Application Areas
This high-precision duplex bearing is ideally suited for applications demanding exceptional accuracy and rigidity, including:
- Machine tool spindles and high-speed machining centers
- Precision grinding spindles and dental handpieces
- High-frequency motor spindles and robotics
- Aerospace positioning systems and navigation instruments
- Medical equipment and laboratory instrumentation
