708 CE/HCP4ADT
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
708 CE/HCP4ADT
Basic Information
System of measurement
Metric
Weight
0.022 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
8 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
22 mm
Outside diameter tolerance
-0.004mm to 0
Width
14 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
8
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
848 lbf
Radial static load rating
360 lbf
Limiting speed
100 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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708 CE/HCP4ADT Bearing Product Overview & Core Advantages
The 708 CE/HCP4ADT is a precision angular contact ball bearing designed for demanding applications requiring exceptional speed and rigidity. This duplex tandem (DT) arrangement consists of two preloaded bearings, delivering superior axial stiffness and the ability to handle significant combined loads. Manufactured to a P4A tolerance class and featuring a phenolic cage with ceramic balls, it is engineered for high-speed operation and long-term reliability in precision machinery.
Model Code Breakdown
| Suffix | Technical Meaning |
|---|---|
| 708 CE | Basic bearing designation with a 15° contact angle. |
| HC | Hybrid Ceramic, indicating ceramic balls for reduced weight, lower friction, and higher speed capability. |
| P4A | High precision tolerance class, exceeding ABEC 7 standards, ensuring minimal runout and vibration. |
| DT | Duplex Tandem arrangement. Two bearings are mounted together and preloaded to maximize axial load capacity and rigidity in one direction. |
708 CE/HCP4ADT Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex tandem configuration and preload create an exceptionally stiff bearing unit, ideal for applications requiring precise shaft positioning under heavy combined loads.
- Superior High-Speed Performance: The combination of a lightweight phenolic cage and hybrid ceramic balls (silicon nitride) significantly reduces centrifugal forces and operating temperatures, enabling a high limiting speed of 100,000 rpm.
- Extended Service Life: Ceramic balls are harder and more wear-resistant than steel, offering superior durability. They are also electrically insulating and less prone to lubrication failure.
- Precision Engineering: The P4A tolerance class guarantees tight dimensional and running accuracy, which is critical for minimizing vibration and achieving high rotational accuracy in precision spindles.
708 CE/HCP4ADT Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications, including:
- High-Frequency Spindles for PCB drilling and milling
- Precision Machine Tool Spindles
- High-Speed Automation & Robotics
- Dental and Medical Handpiece Drives
- Aerospace Actuators and Instrumentation
