71920 CB/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
Ball & Washer Dimensions
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71920 CB/HCP4ADGA Bearing Product Overview & Core Advantages
The 71920 CB/HCP4ADGA is a super-precision angular contact ball bearing engineered for the most demanding high-performance applications. Its universal matchable (SU) design allows for flexible mounting in pairs to support combined loads—simultaneously handling substantial radial and axial forces. Manufactured to the exacting P4A tolerance class, this bearing delivers exceptional running accuracy, rotational stability, and high rigidity. The combination of a ceramic ball material and a phenolic cage contributes to superior high-speed performance, reduced weight, and extended service life, making it an ideal choice for advanced machinery requiring maximum reliability and precision.
71920 CB/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance & Advantage |
|---|---|---|
| 71920 | Basic bearing series and size designation | Defines the core dimensions: 100 mm bore, 140 mm OD, 40 mm width. |
| CB | Specific internal design and contact angle of 15° | Optimized for specific preload and stiffness characteristics. |
| HC | Hybrid Ceramic (Ceramic balls, steel rings) | Enables higher speeds, reduced friction, and longer life due to the properties of ceramic balls. |
| P4A | Tolerance Class (Geometric and running accuracy) | Denotes super-precision grade with extremely tight dimensional and running accuracy tolerances. |
| DGA | Preload designation: Extra Light (Class A) | Provides minimal starting torque and optimal performance for very high-speed applications. |
71920 CB/HCP4ADGA Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The use of silicon nitride (Si3N4) ceramic balls within a chrome steel ring structure significantly reduces centrifugal forces, lowers operating temperature, and allows for a higher limiting speed of 16,000 rpm. This construction also offers superior resistance to wear and electrical arcing.
Phenolic Resin Cage: The lightweight and robust phenolic cage ensures excellent dimensional stability and guidance at high rotational speeds, contributing to smooth operation and reduced vibration.
Universal Matchable (SU) Design: This bearing is designed to be universally matchable in any combination (face-to-face, back-to-back, or tandem) without pre-set preload. This provides design engineers with maximum flexibility to configure bearing pairs for optimal rigidity and load capacity to handle complex combined loads.
Super-Precision P4A Tolerances: The ultra-precise manufacturing to P4A standards ensures minimal runout and vibration, which is critical for applications demanding the highest levels of accuracy and surface finish.
71920 CB/HCP4ADGA Bearing Typical Application Areas
The 71920 CB/HCP4ADGA is specified for high-tech machinery where precision, speed, and reliability are paramount. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and spindle drives requiring high positional accuracy.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and auxiliary power units.
- High-Frequency Motors and Spindles: PCB drilling spindles and dental handpieces.
