71815 CD/P4DBB
71800 Series Super Precision Angular Contact Ball Bearings
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71815 CD/P4DBB Bearing Product Overview & Core Advantages
The 71815 CD/P4DBB is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This metric system bearing is supplied as a matched set in a back-to-back (DB) duplex arrangement, enabling it to withstand combined loads—significant radial loads along with axial loads in both directions. Its P4 tolerance class ensures ultra-precise running, making it ideal for high-speed spindles and other high-precision machinery. The pre-lubricated, open design with a phenolic cage facilitates high-speed operation while maintaining dimensional stability.
71815 CD/P4DBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71815 | Basic bearing designation, indicating a single-row angular contact ball bearing with a 75mm bore, 95mm OD, and 20mm width. |
| C | Designates a 15° contact angle, optimized for high-speed applications requiring a balance between axial and radial load capacity. |
| D | Indicates the bearing is part of a duplex pair. |
| P4 | Specifies the high-precision tolerance class, ensuring minimal runout and superior rotational accuracy. |
| DBB | Defines the duplex arrangement as Back-to-Back (DB). This configuration provides high moment rigidity and is excellent for withstanding overturning moments. |
71815 CD/P4DBB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The back-to-back duplex arrangement creates a wide, stable support system, significantly increasing the bearing set's moment stiffness and ability to handle combined radial and bidirectional axial loads.
- Precision & High-Speed Performance: Manufactured to P4 tolerance standards with a 15° contact angle and a lightweight phenolic resin cage, this bearing achieves a high limiting speed of 22,000 rpm with minimal friction and heat generation.
- Optimized Internal Geometry: The use of 33 high-grade chrome steel balls with a diameter of 5.556 mm ensures smooth operation and contributes to the high dynamic and static load ratings.
- Thermal Stability: The phenolic cage offers excellent dimensional stability across the operating temperature range (-30°C to 110°C), maintaining performance under varying thermal conditions.
71815 CD/P4DBB Bearing Typical Application Areas
This high-precision duplex bearing is engineered for demanding applications where accuracy, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes: Especially in robotics and high-performance automotive systems.
- High-Frequency Motors and Spindles: Used in PCB drilling and semiconductor manufacturing equipment.
- Medical and Laboratory Equipment: Centrifuges and high-speed scanners requiring smooth, precise rotation.
- Aerospace Actuation Systems: Flight control mechanisms and auxiliary power units.
