71904 FE/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71904 FE/HCP4A
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/HCP4A Bearing Product Overview & Core Advantages
The 71904 FE/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This single bearing features a P4A tolerance class and is manufactured with ceramic balls and a phenolic cage, enabling superior high-speed capabilities and reduced rotational mass. Its 18° contact angle is optimized to handle significant combined loads, including high radial and axial loads in one direction. Preloaded and ready for installation, this bearing offers outstanding rigidity and rotational accuracy for the most critical machinery.
71904 FE/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| FE | Indicates a specific internal design and preload grade for high-precision applications. |
| HC | Signifies the use of Hybrid Ceramic balls (Silicon Nitride), which reduce friction and heat generation. |
| P4A | Denotes an ultra-precision tolerance class with even tighter controls on runout and dimensional accuracy than standard P4. |
71904 FE/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed Performance: The combination of ceramic balls and a lightweight phenolic cage significantly lowers centrifugal forces and friction, allowing for a very high limiting speed of 100,500 rpm.
- High Rigidity & Accuracy: The angular contact design and factory-applied preload eliminate internal clearance, resulting in a stiff bearing setup that minimizes deflection under load and ensures exceptional running accuracy, critical for P4A tolerance applications.
- Superior Load Capacity: The 18° contact angle and optimized raceway geometry provide excellent capacity for combined radial and axial loads.
- Reduced Maintenance: The bearing is pre-lubricated for immediate use and long service life within its specified temperature range.
71904 FE/HCP4A Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance applications where speed, accuracy, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles (High-speed milling, grinding)
- Precision Robotics and Automation Arms
- High-Frequency Spindles for PCB Drilling
- Medical and Dental Handpieces
- Aerospace Instrumentation and Guidance Systems
