708 ACD/P4ADBC
Miniature Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
708 ACD/P4ADBC
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
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
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 ACD/P4ADBC Bearing Product Overview & Core Advantages
The 708 ACD/P4ADBC is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This back-to-back (DB) matched arrangement enables the bearing to accommodate combined radial and axial loads from both directions simultaneously. Manufactured to P4A tolerance class and featuring a phenolic cage, it delivers high-speed capability, thermal stability, and reliable performance in demanding precision machinery.
708 ACD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact design with a 25° contact angle, optimized for axial load capacity. |
| P4A | High precision tolerance class (superior to ABEC 7), ensuring minimal runout and vibration. |
| DB | Duplex Back-to-Back mounting arrangement, providing high moment rigidity and preload. |
708 ACD/P4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & Preload: The back-to-back duplex configuration creates a stiff bearing system that resists moment loads and shaft deflection, maintaining precision under combined loads. The Moderate / Class C preload eliminates internal clearance for enhanced positional accuracy.
- Superior High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the optimized 25° contact angle and 9 high-precision chrome steel balls enable stable operation up to 110,000 rpm.
- Precision & Stability: Manufactured to P4A tolerance standards with tight dimensional control (bore/OD tolerance: -0.004mm to 0), ensuring consistent performance and interchangeability in precision assemblies.
- Optimal Material Selection: Chrome steel rings and balls provide high hardness and wear resistance, suitable for a temperature range of -30°C to 110°C.
708 ACD/P4ADBC Bearing Typical Application Areas
- High-Speed Machine Tool Spindles
- Precision Grinding Spindles
- High-Frequency Motorized Spindles
- Medical & Dental Handpiece Drives
- Aerospace Gyroscopes & Instrumentation
- Robotic Arm Precision Joints
