71904 FE/HCP4AL
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71904 FE/HCP4AL
Basic Information
System of measurement
Metric
Weight
0.032 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
20 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
37 mm
Outside diameter tolerance
-0.004mm to 0
Width
9 mm
Width tolerance
-0.2mm to 0
Contact angle
18 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
14
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1098 lbf
Radial static load rating
522 lbf
Limiting speed
100.5 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Available
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
Price available upon request.
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71904 FE/HCP4AL Bearing Product Overview & Core Advantages
The 71904 FE/HCP4AL is a single-row angular contact ball bearing designed for applications requiring ultra-high precision and exceptional speed performance. Engineered to a P4A tolerance class, it offers superior dimensional accuracy and running precision. Its key advantage lies in its ability to accommodate combined loads (radial and axial) simultaneously, making it ideal for high-rigidity, high-speed spindle applications. The combination of a ceramic ball material and phenolic cage contributes to lower friction, reduced weight, and enhanced operational limits.
71904 FE/HCP4AL Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| FE | Indicates a specific internal design and contact angle (18°) optimized for high-speed operation. |
| HC | Signifies the use of Hybrid Ceramic balls (ceramic balls with steel rings). |
| P4A | Denotes an ultra-precision tolerance class with enhanced running accuracy and dimensional control. |
| L | Indicates the bearing is pre-lubricated from the factory. |
71904 FE/HCP4AL Bearing Structural Features & Performance Benefits
- High-Speed Capability: The 18° contact angle, lightweight phenolic resin cage, and hybrid ceramic construction significantly reduce centrifugal forces and friction, enabling a high limiting speed of 100,500 rpm.
- High Rigidity & Load Capacity: The optimized internal geometry and preload availability ensure high system stiffness, effectively handling combined radial and axial loads.
- Precision Performance: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration, which is critical for maintaining accuracy in precision machinery.
- Reduced Heat Generation: Ceramic balls have a lower coefficient of thermal expansion and superior smoothness compared to steel, leading to less heat generation at high speeds.
- Pre-Lubricated: Factory-applied lubrication ensures immediate operational readiness and reliable initial performance.
71904 FE/HCP4AL Bearing Typical Application Areas
This precision angular contact bearing is ideally suited for demanding applications where high speed and high accuracy are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: High-accuracy robotic arms and joints.
- High-Frequency Spindles: PCB drilling and routing machines.
- Medical Equipment: High-speed dental handpieces and surgical tools.
- Aerospace Instrumentation: Gyroscopes and navigation systems.
