708 ACD/P4ADBB
Miniature Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
708 ACD/P4ADBB
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
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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708 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 708 ACD/P4ADBB is a precision duplex pair of Angular Contact Ball Bearings in a Back-to-Back (DB) arrangement, preloaded to Light / Class B. This configuration is engineered for applications demanding high rigidity and exceptional running accuracy. It is capable of supporting combined loads (radial and axial) simultaneously and is optimized for high-speed operation. Manufactured to a P4A tolerance class, this bearing set guarantees superior performance in high-precision and high-reliability machinery.
708 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 708 ACD | Basic bearing designation. ACD signifies an Angular Contact ball bearing with a 25° contact angle. |
| P4A | Indicates a high-precision tolerance class, exceeding ABEC 7 standards, for minimal runout and vibration. |
| DB | Specifies the Duplex Back-to-Back mounting arrangement. This configuration provides high moment rigidity. |
708 ACD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Moment Load Capacity: The Back-to-Back (DB) duplex pair creates a wide effective spread, significantly increasing the bearing set's resistance to moment loads and enhancing overall system stiffness.
- Optimized for High Speeds: The phenolic resin cage is lightweight and exhibits excellent performance at high rotational speeds, contributing to the high limiting speed of 110,000 rpm.
- Precision Performance: The P4A tolerance class ensures tight dimensional and running accuracy, which is critical for applications requiring minimal vibration and high positional accuracy.
- Superior Material: Constructed from Chrome Steel for both rings and balls, providing high hardness, wear resistance, and a long operational life.
708 ACD/P4ADBB Bearing Typical Application Areas
This precision bearing set is ideally suited for:
- Machine Tool Spindles (High-speed milling, grinding)
- Precision Rotary Systems
- High-Frequency Spindles
- Medical and Dental Handpieces
- Advanced Robotics (e.g., precision joint actuators)
