71908 FE/HCP4ALDT
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71908 FE/HCP4ALDT
Basic Information
System of measurement
Metric
Weight
0.18 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
62 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
19
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3578 lbf
Radial static load rating
2700 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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71908 FE/HCP4ALDT Bearing Product Overview & Core Advantages
The 71908 FE/HCP4ALDT is a precision angular contact ball bearing engineered for demanding applications requiring exceptional speed and rigidity. This duplex tandem (DT) arrangement bearing set is preloaded and manufactured to ABEC 7 / P4A tolerance class, ensuring ultra-high running accuracy. Its core advantage lies in its ability to handle high combined loads while operating at very high speeds, making it an ideal solution for high-precision spindles and other critical machinery.
71908 FE/HCP4ALDT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing series and size designation (40mm bore, 62mm OD). |
| FE | Indicates a duplex bearing set with a specific preload. |
| HC | Signifies the use of Hybrid Ceramic balls (Silicon Nitride). |
| P4A | Denotes a high-precision tolerance class (equivalent to ABEC 7). |
| DT | Specifies the Duplex Tandem arrangement of the two bearings in the set. |
71908 FE/HCP4ALDT Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of steel rings and ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and extends service life, enabling higher limiting speeds (41,000 rpm).
- Duplex Tandem (DT) Arrangement: This configuration provides maximum axial rigidity and load capacity in one direction, ideal for applications with heavy thrust loads.
- Phenolic Resin Cage: The lightweight and robust phenolic cage ensures excellent guidance and stability at high rotational speeds, contributing to smooth and quiet operation.
- P4A Precision & Preload: The high precision grade and factory-set preload eliminate axial play, resulting in superior running accuracy, high system stiffness, and reduced vibration.
- Open Design & Pre-lubrication: The open seal type allows for optimal lubrication flow, while the bearing comes pre-lubricated for immediate operation within its specified temperature range.
71908 FE/HCP4ALDT Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications, including:
- High-Speed Machine Tool Spindles (CNC milling, grinding, and drilling)
- Precision Robotic Drives
- High-Frequency Motors and Spindles
- Aerospace Instrumentation
- Medical and Dental Handpieces
