708 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
708 ACD/HCP4A
Basic Information
System of measurement
Metric
Weight
0.011 kg
Tolerance class
P4 (ABEC-7)
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
-0.005mm to 0
Width
7 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
9
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
718 lbf
Radial static load rating
302 lbf
Limiting speed
150 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
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
Price:
$ 103.3
/ each
In Stock
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708 ACD/HCP4A Bearing Product Overview & Core Advantages
The 708 ACD/HCP4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and rigidity. Designed to accommodate combined loads (simultaneous radial and axial loads), this bearing features a 25° contact angle optimized for high axial load capacity. Manufactured to P4 (ABEC-7) tolerance class, it delivers superior running accuracy and is preloaded for enhanced stiffness and minimal deflection under operational stresses. Its compact design with 8mm bore diameter makes it ideal for space-constrained, high-performance machinery.
708 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Performance Benefit |
|---|---|---|
| ACD | Angular Contact Design with 25° contact angle | Optimized for high axial load capacity and rigidity |
| HC | Hybrid Ceramic (Ceramic balls with steel rings) | Reduced friction, higher speed capability, and longer service life |
| P4A | P4 Precision Class with preload specification | Exceptional running accuracy and stiffness for critical applications |
708 ACD/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: Features ceramic balls (Si3N4) combined with chrome steel rings, significantly reducing centrifugal forces and enabling higher limiting speeds (150,000 rpm) while providing electrical insulation and superior wear resistance.
- Precision Ground Components: Manufactured to P4 tolerance class with tight dimensional control (bore tolerance: -0.004mm to 0), ensuring minimal vibration and optimal performance in precision systems.
- Phenolic Resin Cage: The lightweight, high-strength phenolic cage provides excellent guidance for the ceramic balls, contributing to smooth operation at high speeds and reduced friction.
- Preload Configuration: Supplied with preload for immediate high rigidity and precise rotational accuracy, eliminating initial play and enhancing system stability.
- Optimized Lubrication: Factory-lubricated for immediate operation, supporting the full temperature range of -30°C to 110°C.
708 ACD/HCP4A Bearing Typical Application Areas
- High-Speed Spindles: CNC machining centers, precision grinding spindles
- Medical Equipment: Dental handpieces, surgical drill motors
- Aerospace Systems: Gyroscopes, navigation instruments
- Semiconductor Manufacturing: Wafer handling robots, precision positioning stages
- Laboratory Instruments: High-speed centrifuges, analytical equipment
