7218 CD/HCP4ADBA
Hybrid Ceramic Super Precision Bearings
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7218 CD/HCP4ADBA Bearing Product Overview & Core Advantages
The 7218 CD/HCP4ADBA is a precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement provides superior stability and can accommodate combined radial and axial loads from both directions. Manufactured to P4A tolerance class and featuring a phenolic cage with ceramic balls, this bearing is engineered for high-speed operation and long-term reliability in precision machinery.
7218 CD/HCP4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
| 7218 | Basic bearing series with 90mm bore, 160mm OD |
| C | 15° contact angle design |
| D | Duplex arrangement |
| HC | Hybrid Ceramic (Silicon Nitride balls with steel rings) |
| P4A | High-precision tolerance class (superior to ABEC 7) |
| DB | Back-to-Back mounting configuration |
| A | Extra light preload |
7218 CD/HCP4ADBA Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces friction, minimizes heat generation, and extends service life, particularly in high-speed applications.
Enhanced Rigidity: The back-to-back duplex arrangement creates a rigid bearing system that effectively resists moment loads and maintains precise shaft positioning under heavy combined loads.
Superior High-Speed Capability: The lightweight phenolic cage and ceramic balls enable operation at limiting speeds up to 17,000 rpm, while the open design facilitates efficient lubrication.
Precision Performance: Manufactured to P4A tolerance class with strict dimensional control, this bearing ensures minimal runout and vibration for applications requiring exceptional rotational accuracy.
7218 CD/HCP4ADBA Bearing Typical Application Areas
- Machine Tool Spindles: High-precision milling, grinding, and turning centers
- High-Speed Machining Centers: Applications requiring both accuracy and rapid operation
- Precision Robotics: Robot arm joints and rotary tables
- Aerospace Components: Gyroscopes, navigation systems, and auxiliary power units
- Medical Equipment: Dental handpieces, surgical robots, and imaging systems
- Test and Measurement Equipment: Coordinate measuring machines and optical comparators
