7211 CDGC/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7211 CDGC/P4A Bearing Product Overview & Core Advantages
The 7211 CDGC/P4A is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Operating under P4A tolerance class, this bearing is engineered to handle combined loads efficiently, supporting significant radial loads and axial loads in one direction. Its moderate preload (Class C) ensures optimal stiffness and minimizes deflection under operational stresses. The phenolic cage contributes to its suitability for high-speed operation, with a limiting speed of 34,000 rpm, making it an ideal choice for high-performance machinery requiring reliable, long-lasting performance.
7211 CDGC/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7211 | Basic bearing series, indicating a metric angular contact ball bearing with a 55mm bore, 100mm OD, and 21mm width. |
| CD | Contact angle designation (15°), optimized for handling combined radial and axial loads. |
| GC | Indicates a Universal Matchable (SU) bearing, designed to be paired in sets (typically 4 bearings) for preloaded arrangements to achieve maximum system rigidity. |
| P4A | The tolerance class, denoting very high precision levels for bore diameter, outside diameter, and width tolerances, ensuring minimal runout and superior rotational accuracy. |
7211 CDGC/P4A Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The angular contact design with a 15° contact angle and moderate preload provides high axial and radial stiffness, enabling the bearing to withstand substantial combined loads (dynamic load rating: 12,442 lbf). This design is critical for applications where shaft deflection must be minimized.
High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, allowing for smooth operation at the high limiting speed of 34,000 rpm. This makes the bearing suitable for demanding high-speed applications.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control (bore and OD tolerance: -0.004mm to 0), this bearing ensures exceptional running accuracy and low vibration, which is essential for precision machinery.
Universal Matching Capability: As a Universal Matchable (SU) bearing, the 7211 CDGC/P4A can be supplied in pre-matched sets (up to 4 bearings) that are engineered to work together seamlessly, simplifying installation and guaranteeing optimal preload and performance in the final application.
7211 CDGC/P4A Bearing Typical Application Areas
The 7211 CDGC/P4A is ideally suited for high-precision and high-speed machinery, including:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Industrial Pumps and Compressors
- Aerospace Control Systems
