71920 FEGA/HCPA9A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71920 FEGA/HCPA9A
Basic Information
System of measurement
Metric
Weight
0.65 kg
Tolerance class
PA9A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
100 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
140 mm
Outside diameter tolerance
-0.004mm to 0
Width
20 mm
Width tolerance
-0.2mm to 0
Contact angle
18 °
Ball & Washer Dimensions
Ball diameter
12.7 mm
Ball quantity
24
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
8775 lbf
Radial static load rating
6975 lbf
Limiting speed
16 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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71920 FEGA/HCPA9A Bearing Product Overview & Core Advantages
The 71920 FEGA/HCPA9A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This single bearing features an Extra Light (A) preload and is designed as a Universal Matchable (SU) unit, allowing for precise pairing in duplex sets to achieve optimal stiffness and rotational accuracy. Its construction with a phenolic cage and ceramic balls contributes to lower friction, higher limiting speeds, and superior performance in high-speed environments. This bearing is pre-lubricated and operates effectively within a wide temperature range, making it a reliable choice for high-precision, high-speed spindles.
71920 FEGA/HCPA9A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Advantage |
|---|---|---|
| F | Precision Machined Brass Cage (Historical designation, superseded by current phenolic cage in this spec) | Indicates a high-grade, precision-manufactured component. |
| E | Optimized Internal Geometry | Enhanced performance for speed and load capacity. |
| GA | Light Preload / Class A Preload | Reduces axial and radial play for higher system rigidity and precision. |
| HC | Hybrid Ceramic (Silicon Nitride Balls) | Lower density, higher stiffness, reduced friction, and capability for higher speeds and longer service life. |
| PA9A | High Precision Tolerance Class | Ensures extremely tight dimensional and running accuracy for critical applications. |
71920 FEGA/HCPA9A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The 18° contact angle and Extra Light preload (A) provide high axial rigidity and precise rotational accuracy, minimizing deflection under load.
- Superior High-Speed Performance: The combination of a lightweight phenolic cage and low-density ceramic balls significantly reduces centrifugal forces, enabling a very high limiting speed of 16,000 rpm.
- Enhanced Durability and Life: Hybrid ceramic construction offers excellent wear resistance and operates effectively with minimal lubrication. The wide operating temperature range (-30°C to 110°C) ensures reliability in various environments.
- Universal Matching Design (SU): Manufactured to universal matching standards, allowing two bearings to be paired in a matched set (back-to-back, face-to-face, or tandem) without selective assembly, simplifying installation and optimizing system performance.
71920 FEGA/HCPA9A Bearing Typical Application Areas
This bearing is ideally suited for high-performance machinery where high speed, precision, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- High-Frequency Motors and Spindles: Motors for PCB drilling and dental handpieces.
- Aerospace and Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
