7213 ACD/HCP4ADBB
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
Ball & Washer Dimensions
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7213 ACD/HCP4ADBB Bearing Product Overview & Core Advantages
The 7213 ACD/HCP4ADBB is a precision duplex pair of angular contact ball bearings, pre-matched in a back-to-back (DB) arrangement. This configuration is engineered to provide exceptional high rigidity and stability, making it ideally suited for applications requiring high rotational accuracy and the ability to withstand significant combined loads (radial and axial loads from both directions). The use of ceramic balls and a P4A super-precision tolerance class ensures superior performance in demanding, high-speed operational environments.
7213 ACD/HCP4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7213 | Basic bearing series, defining the standard boundary dimensions (65mm bore, 120mm OD, 46mm width). |
| AC | Angular Contact design with a 25° contact angle for optimal axial load capacity. |
| D | Duplex pair (two bearings supplied as a set). |
| HC | Hybrid Ceramic, indicating the use of ceramic balls for reduced weight, lower friction, and higher speed capability. |
| P4A | Super Precision Tolerance Class, specifying extremely tight dimensional and running accuracy for high-precision applications. |
| DB | Back-to-Back arrangement, providing high moment rigidity and effective compensation for axial loads in both directions. |
| B | Light Preload (Class B), applied to the duplex set to eliminate internal clearance and enhance system stiffness. |
7213 ACD/HCP4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide effective spread between load centers, significantly increasing the bearing set's resistance to moment loads and ensuring exceptional operational stability and high rigidity.
Enhanced Speed & Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic cage allows for a higher limiting speed (36,000 rpm) and lower operating temperatures compared to all-steel equivalents. The open seal design minimizes friction for maximum performance.
Superior Load Capacity: With a 25° contact angle and a dynamic load rating of 23,400 lbf, this bearing pair is engineered to handle substantial combined loads simultaneously.
Precision & Accuracy: The P4A tolerance class guarantees minimal runout and precise rotational accuracy, which is critical for applications where positioning and repeatability are paramount.
7213 ACD/HCP4ADBB Bearing Typical Application Areas
This high-performance bearing set is specifically designed for advanced machinery requiring high speed, precision, and rigidity. Key applications include:
- High-Speed Machine Tool Spindles (milling, grinding)
- Precision Grinding Spindles
- High-Frequency Motors
- Advanced Robotics and Automation Axes
- Aerospace and Defense Instrumentation
