71909 FEGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71909 FEGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.12 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
45 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
68 mm
Outside diameter tolerance
-0.004mm to 0
Width
12 mm
Width tolerance
-0.2mm to 0
Contact angle
18 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2272 lbf
Radial static load rating
1508 lbf
Limiting speed
41 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
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In Stock
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Product Overview and Core Advantages
The 71909 FEGA/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This single bearing features an Extra Light preload (Class A) and is manufactured to P4A tolerance class, ensuring superior running accuracy and minimal vibration. Its 18° contact angle is optimized to handle combined loads, efficiently supporting both radial and axial forces. The use of ceramic balls and a phenolic cage contributes to its capability for high-speed operation up to 41,000 rpm, offering high rigidity and extended service life in precision machinery.
71909 FEGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| FE | Designates a specific internal design and contact angle (18°) optimized for high-speed performance. |
| GA | Indicates Universal Matchable (SU) arrangement. Two bearings can be paired for a specific preload and stiffness. |
| HC | Signifies the use of Hybrid Ceramic components (ceramic balls with steel rings). |
| P4A | Denotes an ultra-high precision tolerance class with strict limits on bore, OD, and width runouts. |
Structural Features and Performance Benefits
- High Rigidity and Precision: Manufactured to P4A tolerance class with an Extra Light preload, this bearing provides exceptional rotational accuracy and stiffness, minimizing deflection under load.
- Superior High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic cage enables stable operation at the high limiting speed of 41,000 rpm.
- Enhanced Durability and Temperature Resistance: Hybrid ceramic construction reduces friction and heat generation, offering improved performance across the temperature range of -30°C to 110°C. The phenolic cage provides excellent dimensional stability at high speeds.
- Optimized Load Capacity: The 18° contact angle design effectively handles combined radial and axial loads, with a dynamic load rating of 2272 lbf and a static load rating of 1508 lbf.
71909 FEGA/HCP4A Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers requiring utmost accuracy.
- High-Frequency Motors and Spindles: Where minimal vibration and heat generation are critical.
- Precision Instrumentation: Including measuring devices and laboratory equipment.
- Aerospace and Defense Systems: For gyroscopes, navigation systems, and other critical components.
