7211 CD/HCP4ADBB
Hybrid Ceramic Super Precision Bearings
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7211 CD/HCP4ADBB Bearing Product Overview & Core Advantages
The 7211 CD/HCP4ADBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This back-to-back (DB) matched set features a light preload (Class B), enabling it to handle combined radial and axial loads simultaneously with high stability. Manufactured to P4A tolerance class with a 15° contact angle and ceramic balls, it delivers superior high-speed performance and extended service life, making it ideal for high-precision, high-reliability machinery.
7211 CD/HCP4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| CD | Duplex bearing with a 15° contact angle and specific internal design. |
| HC | Hybrid Ceramic: Signifies the use of ceramic balls for reduced friction and higher speed capability. |
| P4A | Indicates a super-precision tolerance class for running accuracy and dimensional stability. |
| DB | Duplex Back-to-Back: Denotes the matched arrangement of two bearings mounted back-to-back. |
| B | Specifies a light preload applied to the matched set for optimal rigidity. |
7211 CD/HCP4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The back-to-back duplex arrangement creates a wide effective spread, providing exceptional moment stiffness and resistance to overturning moments, which is critical for maintaining precision under combined loads.
- Superior High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic cage significantly lowers friction and allows for a high limiting speed of 34,000 rpm.
- Enhanced Load Capacity: The 15° contact angle is optimized to handle significant axial loads in addition to high radial dynamic load ratings (20,340 lbf), making it suitable for demanding applications.
- Precision & Longevity: Manufactured to P4A tolerance class with a lubricated and open design, this bearing ensures smooth, quiet operation and consistent performance over a wide temperature range (-30°C to 110°C).
7211 CD/HCP4ADBB Bearing Typical Application Areas
This high-precision duplex bearing is engineered for advanced machinery where accuracy, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles (High-speed milling, grinding)
- Precision Gearboxes and Robotic Drives
- High-Frequency Motors and Spindle Drives
- Aerospace Actuation Systems
- Medical and Laboratory Equipment
