708 ACD/P4ADGC
Miniature Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
708 ACD/P4ADGC
Basic Information
System of measurement
Metric
Weight
0.024 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
25 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
9
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1170 lbf
Radial static load rating
596 lbf
Limiting speed
110 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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708 ACD/P4ADGC Bearing Product Overview & Core Advantages
The 708 ACD/P4ADGC is a precision angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. Manufactured to P4A tolerance class, this bearing delivers superior running precision. Its 25° contact angle and Universal Matchable (SU) design enable it to accommodate combined radial and axial loads efficiently. Preloaded with a Moderate / Class C preload, it offers high system rigidity and is optimized for high-speed operation up to 110,000 rpm. The phenolic cage and chrome steel construction ensure reliable performance in demanding conditions.
708 ACD/P4ADGC Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle. |
| P4A | Indicates a high-precision tolerance class for superior dimensional and running accuracy. |
| DGC | Specifies a Universal Matchable (SU) arrangement, allowing two bearings to be paired for optimal load sharing and preload. |
708 ACD/P4ADGC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The angular contact design and Moderate preload provide excellent resistance to deflection, making it ideal for applications requiring high system stiffness. It can effectively handle combined loads.
- Superior High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, enabling stable operation at the high limiting speed of 110,000 rpm.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls on the bore diameter and outside diameter, ensuring minimal runout and vibration.
- Durable Construction: Made from high-grade chrome steel for both rings and balls, providing high fatigue life and wear resistance.
708 ACD/P4ADGC Bearing Typical Application Areas
This precision bearing is ideally suited for:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Medical and Dental Equipment
- High-Speed Pumps and Compressors
