7211 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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7211 ACDGA/HCP4A Bearing Product Overview & Core Advantages
The 7211 ACDGA/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This single bearing features a 25° contact angle and an Extra Light (Class A) preload, making it ideal for applications requiring high rigidity and minimal deflection under combined loads. Its P4A tolerance class ensures superior running accuracy, while the ceramic ball and phenolic cage construction contribute to its capabilities as a high-speed bearing. It is universally matchable (SU), allowing for precise arrangement in sets of three to handle complex load conditions.
7211 ACDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7211 | Basic bearing series and size designation (55mm bore, 100mm OD, 21mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| DGA | Duplex arrangement face-to-face (DF) with Class A preload. |
| HC | Hybrid Ceramic construction (steel rings with ceramic balls). |
| P4A | High-Precision Tolerance Class, superior to ABEC 7. |
7211 ACDGA/HCP4A Bearing Structural Features & Performance Benefits
High Rigidity and Precision: The angular contact design with a defined 25° contact angle and Class A preload provides high system rigidity and precise rotational accuracy, critical for minimizing runout in high-speed spindles.
Superior High-Speed Performance: The combination of a lightweight phenolic resin cage and low-density ceramic (hybrid) balls reduces centrifugal forces, enabling a high limiting speed of 34,000 rpm. This also reduces operating temperature and increases service life.
Enhanced Load Capacity: Engineered to support significant combined loads (radial and axial), with a dynamic load rating of 11,858 lbf and a static load rating of 9,112 lbf.
Universal Matching Capability (SU): This bearing is manufactured to universal matching standards, allowing it to be mounted in sets (typically 3 bearings) without selective assembly to achieve the desired preload and stiffness.
7211 ACDGA/HCP4A Bearing Typical Application Areas
The 7211 ACDGA/HCP4A is ideally suited for high-performance machinery where precision, speed, and reliability are paramount. Key applications include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles.
- Precision Instruments: High-speed measuring and testing equipment.
- Robotics: High-accuracy robotic arm joints and drives.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and avionics.
