7220 CD/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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7220 CD/HCP4ADGA Bearing Product Overview & Core Advantages
The 7220 CD/HCP4ADGA is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This universal matchable (SU) bearing is designed to accommodate combined loads (radial and axial) simultaneously. Its key advantages stem from a P4A tolerance class for superior running accuracy, a phenolic resin cage enabling high-speed operation, and ceramic balls that reduce weight and centrifugal forces. The extra light preload (Class A) ensures high rigidity and precise rotational characteristics, making it ideal for high-reliability, high-speed spindles.
7220 CD/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7220 | Basic bearing series and size designation (100mm bore, 180mm OD). |
| CD | Contact angle of 15° and high-precision design. |
| HC | Hybrid Ceramic: Signifies the use of ceramic balls. |
| P4A | The tolerance class, denoting very high precision for spindle applications. |
| DGA | Universal Matchable (SU): Bearings are supplied in a matched set of 2 and can be arranged in various configurations (back-to-back, face-to-face, tandem). |
7220 CD/HCP4ADGA Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The extra light preload (Class A) eliminates internal clearance, providing high system stiffness and precise shaft positioning, which is critical for machining accuracy.
- Superior High-Speed Performance: The combination of a lightweight phenolic resin cage and low-density ceramic balls significantly reduces centrifugal forces, allowing for a high limiting speed of 16,000 rpm.
- Enhanced Durability and Life: Hybrid ceramic construction offers superior wear resistance, reduced operating temperature, and extended service life compared to all-steel bearings, especially under high-speed conditions.
- Universal Matching Capability: As a Universal Matchable (SU) bearing supplied in a set, it simplifies installation and ensures optimal preload and performance when mounted in pairs.
7220 CD/HCP4ADGA Bearing Typical Application Areas
This high-precision angular contact ball bearing is specifically designed for advanced machinery where speed, accuracy, and reliability are paramount. Key applications include:
- Machine Tool Spindles: High-speed CNC machining centers, grinding spindles, and milling spindles.
- High-Frequency Motors and Spindles: Applications requiring extreme rotational speeds.
- Precision Instrumentation: Advanced measuring and testing equipment.
- Aerospace and Defense Systems: Gyroscopes, radar systems, and other critical rotational components.
