7220 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
Ball & Washer Dimensions
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7220 CD/HCP4A Bearing Product Overview & Core Advantages
The 7220 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, while the P4 (ABEC-7) tolerance class guarantees consistent, reliable operation in precision machinery.
7220 CD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Advantage |
|---|---|---|
| C | 15° Contact Angle | Optimized for combined loads with moderate axial capacity. |
| D | High Load Capacity Internal Design | Enhanced radial dynamic load rating (35,100 lbf). |
| HC | Hybrid Ceramic (Silicon Nitride Balls) | Reduced weight, lower friction, and extended service life at high speeds. |
| P4 | P4 (ABEC-7) Tolerance Class | Ultra-precision running accuracy for applications demanding minimal vibration and runout. |
| A | 30° Contact Angle (Noted Discrepancy: Spec is 15°) | Please verify application requirements against the specified 15° contact angle. |
7220 CD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The preload applied to the bearing eliminates internal clearance, resulting in high system stiffness and precise shaft positioning, critical for machining accuracy.
- Superior High-Speed Capability: The combination of ceramic balls and a lightweight phenolic cage significantly reduces centrifugal forces, allowing for a high limiting speed of 14,000 rpm. This design minimizes heat generation and ensures stable operation.
- Excellent Load Capacity: The optimized internal geometry (suffix D) provides a high radial dynamic load rating, enabling the bearing to handle significant combined loads (radial and axial).
- Optimized for Precision Applications: Manufactured to a P4 tolerance class, this bearing ensures extremely tight dimensional control on the bore diameter, outside diameter, and width for superior running accuracy.
7220 CD/HCP4A Bearing Typical Application Areas
The 7220 CD/HCP4A is ideally suited for high-performance machinery where speed, precision, and rigidity are paramount. Key sectors include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and spindle drives requiring high positional accuracy.
- High-Frequency Motors and Spindles: Applications demanding low vibration and heat generation at extreme rotational speeds.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other critical navigation components.
