7212 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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7212 CD/HCP4A Bearing Product Overview & Core Advantages
The 7212 CD/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional rotational accuracy and rigidity. This single-row bearing features a 15° contact angle and is supplied with a preload, ensuring minimal axial and radial play for superior system stability. Its construction with a ceramic ball and phenolic cage enables outstanding high-speed performance, with a limiting speed of 24,000 rpm. Designed to handle combined loads, it is an ideal solution for high-rigidity and high-reliability precision machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 7212 | Basic bearing series and size designation (60mm bore, 110mm OD). |
| CD | Indicates a duplex arrangement with a specific preload level for high rigidity. |
| HC | Signifies the use of Hybrid Ceramic balls (steel rings with ceramic balls). |
| P4 | Denotes a super-precision tolerance class (ABEC-7 / ISO P4), ensuring extremely tight dimensional and running accuracy. |
| A | Specifies a 30° contact angle (Note: This appears to be a discrepancy with the provided 15° contact angle. Please verify the product specification). |
7212 CD/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and extends bearing life, especially under high-speed conditions.
- High Rigidity & Preload: The bearing is supplied with a preload, eliminating internal clearance. This provides maximum stiffness and precise shaft positioning, critical for applications with minimal deflection requirements.
- Superior High-Speed Capability: The lightweight phenolic resin cage and low-density ceramic balls work in concert to achieve a very high limiting speed of 24,000 rpm, reducing friction and inertia.
- Precision Performance: Manufactured to P4 (ABEC-7) tolerance class, this bearing guarantees exceptional running accuracy, low noise, and low vibration levels.
- Optimized Load Capacity: The 15° contact angle is optimized to handle significant combined loads (radial and axial), making it versatile for complex loading scenarios.
7212 CD/HCP4A Bearing Typical Application Areas
The 7212 CD/HCP4A is designed for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications requiring ultra-fine surface finishes.
- High-Frequency Motors and Spindles: Where rotational accuracy at high RPM is critical.
- Aerospace & Defense Systems: Gyroscopes, navigation systems, and other precision instruments.
- Medical Equipment: Dental handpieces and high-speed surgical tools.
