71909 FE/HCP4ALDT
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71909 FE/HCP4ALDT
Basic Information
System of measurement
Metric
Weight
0.23 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
24 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
3712 lbf
Radial static load rating
3015 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Tandem (DT)
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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71909 FE/HCP4ALDT Bearing Product Overview & Core Advantages
The 71909 FE/HCP4ALDT is a precision angular contact ball bearing designed for demanding applications requiring exceptional performance. This duplex tandem arrangement bearing set is preloaded and manufactured to P4A tolerance class, ensuring superior running accuracy and dimensional stability. Its core advantage lies in its ability to handle high axial loads in one direction with maximum rigidity, making it ideal for high-speed spindles and precision machinery where uncompromising accuracy is critical. The combination of a phenolic cage and ceramic balls contributes to its high-speed capability and extended service life.
71909 FE/HCP4ALDT Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| FE | Indicates a specific internal design and contact angle optimized for high-speed operation. |
| HC | Signifies the use of Hybrid Ceramic balls (Silicon Nitride), which reduce centrifugal forces, lower operating temperature, and enable higher limiting speeds. |
| P4A | Denotes an ultra-precision tolerance class with very tight limits on bore, outside diameter, and width tolerances for exceptional running accuracy. |
| DT | Specifies a Duplex Tandem matched set. Two bearings are mounted together to share the load and increase axial load capacity in a single direction. |
71909 FE/HCP4ALDT Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex tandem (DT) arrangement creates a highly rigid bearing system capable of supporting very high axial loads in one direction. This configuration is essential for applications requiring minimal shaft deflection under heavy loads.
- Superior High-Speed Performance: The combination of a lightweight, high-strength phenolic cage and low-density ceramic (hybrid) balls significantly reduces centrifugal forces and friction. This allows the bearing to achieve a high limiting speed of 41,000 rpm with stable operation.
- Precision & Accuracy: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and precise dimensional conformity, which is critical for the accuracy of machine tool spindles and other high-precision equipment.
- Preloaded Design: The bearings are supplied as a preloaded set, eliminating internal clearance and ensuring immediate, precise rotational performance without the need for complex adjustment during installation.
71909 FE/HCP4ALDT Bearing Typical Application Areas
This bearing is engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines, high-frequency motors.
- High-Speed Automation: Robotic arm joints, high-speed pick-and-place units.
- Medical Equipment: Dental handpieces, high-speed centrifuges.
