71906 CD/HCP4ADBC
Hybrid Ceramic Super Precision Bearings
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71906 CD/HCP4ADBC Bearing Product Overview & Core Advantages
The 71906 CD/HCP4ADBC is a precision angular contact ball bearing configured as a duplex back-to-back (DB) pair. This matched set is designed to deliver exceptional high-speed performance and high rigidity, making it ideal for applications requiring superior rotational accuracy and stability. Its key advantage lies in its ability to support combined loads (radial and axial) simultaneously from both directions, facilitated by the 15° contact angle and preloaded DB arrangement. Manufactured to a P4A tolerance class, it ensures ultra-precision operation, while the use of ceramic balls reduces centrifugal forces, enabling higher limiting speeds and extended service life.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71906 | Bearing series and size designation (30mm bore, 47mm OD, 18mm width). |
| CD | Duplex bearing with a Back-to-Back (DB) arrangement. |
| HC | Hybrid Ceramic: Signifies the use of ceramic balls. |
| P4A | Indicates a high-precision tolerance class, superior to ABEC-7. |
| DB | Duplex Back-to-Back mounting configuration. |
| C | Specifies a Moderate preload (Class C). |
71906 CD/HCP4ADBC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and provides exceptional running accuracy. This configuration allows the bearing set to handle significant combined radial and axial loads from both directions.
High-Speed Performance: The combination of ceramic (Si3N4) balls and a lightweight phenolic resin cage is critical for high-speed operation. Ceramic balls have lower density, reducing centrifugal force and operational temperature, while the phenolic cage offers excellent strength and guidance at high RPMs, contributing to the high limiting speed of 100,500 rpm.
Precision & Longevity: Manufactured to P4A precision tolerances with a moderate preload (C), this bearing set ensures minimal runout and consistent performance. The open design is factory lubricated, ready for installation into a controlled environment or a sealed housing.
71906 CD/HCP4ADBC Bearing Typical Application Areas
This high-precision, high-speed bearing set is engineered for demanding applications, including:
- Machine Tool Spindles (High-speed milling, grinding, and drilling)
- Precision Grinding Spindles
- High-Frequency Motors
- Robotic Drives and Servo Motors
- Aerospace Actuators and Control Systems
