71815 CD/P4DBA
71800 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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71815 CD/P4DBA Bearing Product Overview & Core Advantages
The 71815 CD/P4DBA is a metric precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) matched set delivers superior performance in handling combined loads, including significant radial and bidirectional axial loads. Manufactured to P4 tolerance class, it offers extremely tight dimensional control for high-precision positioning. The phenolic cage and optimized 15° contact angle contribute to its high-speed capabilities, making it an ideal solution for machine tool spindles and other high-performance rotary systems.
71815 CD/P4DBA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| CD | Duplex bearing in Back-to-Back (DB) arrangement, providing high moment rigidity and precise axial positioning |
| P4 | High precision tolerance class with extremely tight dimensional and running accuracy requirements |
| DBA | Duplex set with extra light preload (Class A), optimized for high-speed operation with minimal friction |
71815 CD/P4DBA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The back-to-back duplex arrangement creates a wide effective spread between load centers, significantly enhancing moment stiffness and stability under combined radial and axial loads. This configuration can accommodate thrust loads in both directions while maintaining precise shaft positioning.
Precision Engineering: Manufactured to P4 tolerance class with bore and outside diameter tolerances of -0.004mm to 0, ensuring exceptional running accuracy and minimal vibration. The 15° contact angle provides optimal balance between radial and axial load capacity.
High-Speed Performance: The phenolic resin cage offers excellent strength-to-weight ratio and smooth operation at high speeds, contributing to the bearing's limiting speed of 28,000 rpm. The light preload ensures stable operation with minimal heat generation.
Premium Materials: Constructed from chrome steel for both rings and balls, providing high hardness, wear resistance, and dimensional stability across the operating temperature range of -30°C to 110°C.
71815 CD/P4DBA Bearing Typical Application Areas
- Machine tool spindles for milling, grinding, and turning centers
- High-speed machining centers requiring precise axial positioning
- Precision rotary tables and indexing devices
- Industrial pumps and compressors operating at high speeds
- Medical equipment spindles and rotary assemblies
- Aerospace positioning systems demanding high accuracy and reliability
