7211 ACDGB/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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7211 ACDGB/HCP4A Bearing Product Overview & Core Advantages
The 7211 ACDGB/HCP4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and rigidity. Designed to accommodate primarily axial loads in one direction and combined loads, this bearing features a 25° contact angle for optimal thrust capacity. Its P4A tolerance class ensures ultra-precise dimensional and running accuracy, making it ideal for demanding, high-speed machinery. The combination of ceramic balls and phenolic cage contributes to reduced weight, lower friction, and superior performance at high rotational speeds.
Model Code Breakdown
- 7211: Basic designation indicating a medium series bearing with 55mm bore and 100mm outside diameter.
- AC: Angular Contact design with a 25° contact angle.
- D: Signifies an enhanced internal design, optimizing load distribution.
- GB: Indicates Universal Matchable (SU) bearings, allowing for precise preloading when mounted in pairs or sets.
- HC: Denotes the use of Hybrid Ceramic balls (steel rings with ceramic balls).
- P4A: Specifies a very high tolerance class, exceeding ABEC 7 precision, for exceptional running accuracy and low runout.
7211 ACDGB/HCP4A Bearing Structural Features & Performance Benefits
High-Speed Capability: The lightweight phenolic resin cage and low-friction ceramic balls significantly reduce centrifugal forces and operating temperatures, enabling a high limiting speed of 34,000 rpm.
Superior Rigidity and Load Capacity: The optimized internal geometry and 25° contact angle provide high axial and radial stiffness, supporting a dynamic load rating of 11,858 lbf and a static load rating of 9,112 lbf.
Precision Performance: Manufactured to P4A tolerance class, this bearing guarantees minimal vibration and precise shaft positioning, which is critical for applications requiring high rotational accuracy.
Universal Matching: Designated as Universal Matchable (SU), these bearings can be supplied in pre-matched sets (3 bearings in this case) for simplified installation and optimal preload control in duplex arrangements.
7211 ACDGB/HCP4A Bearing Typical Application Areas
The 7211 ACDGB/HCP4A is ideally suited for high-performance applications including:
- Machine Tool Spindles
- High-Speed Machining Centers
- Precision Grinding Spindles
- Dental and Medical Handpieces
- Aerospace Actuators and Control Systems
- High-Frequency Motors and Spindles
