71920 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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71920 CDGA/HCP4A Bearing Product Overview & Core Advantages
The 71920 CDGA/HCP4A is a single-row angular contact ball bearing engineered for ultra-high precision and high-speed applications. Positioned in the P4A super-precision tolerance class, it delivers exceptional running accuracy and rotational stability. Its core advantage lies in its ability to support combined loads (radial and axial) simultaneously, making it ideal for machine tool spindles and other demanding equipment. The combination of a ceramic ball material and a phenolic cage contributes to lower friction, higher limiting speeds, and extended service life.
71920 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| 71920 | Basic bearing series and size designation. |
| C | 15° contact angle. |
| DG | Universal Matchable bearing. Can be mounted in tandem, back-to-back, or face-to-face arrangements with other universal match bearings to achieve specific preload and stiffness characteristics. |
| A | Extra light preload class. |
| HC | Hybrid Ceramic design, featuring ceramic balls and steel rings. |
| P4A | Super precision tolerance class, exceeding ABEC 7/ISO P4 standards. |
71920 CDGA/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed Performance & Rigidity: The phenolic resin cage is lightweight and ensures excellent guidance and stability at the very high limiting speed of 16,000 rpm. The extra light preload (Class A) minimizes friction and heat generation while providing sufficient rigidity for precise applications.
- Superior Load Capacity: Engineered with a 15° contact angle, this bearing is optimized to handle significant combined loads, particularly thrust loads in one direction, alongside radial loads.
- Hybrid Ceramic Advantage: The use of ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and provides electrical insulation. This results in higher speed capability, longer lubricant life, and enhanced durability compared to all-steel bearings.
- Ultra-Precision: Manufactured to P4A tolerance class with tight bore and outside diameter tolerances, this bearing guarantees minimal runout and vibration, which is critical for achieving superior surface finishes and machining accuracy.
71920 CDGA/HCP4A Bearing Typical Application Areas
The 71920 CDGA/HCP4A is specified for the most demanding high-precision and high-speed machinery, including:
- Machine Tool Spindles (milling, grinding, and turning centers)
- High-Frequency Machining Spindles
- Precision Instrumentation
- High-Speed Pumps and Compressors
- Aerospace Gyroscopes and Navigation Systems
