708 CD/P4ADBA
Miniature Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
708 CD/P4ADBA
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
15 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
9
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1186 lbf
Radial static load rating
619 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
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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708 CD/P4ADBA Bearing Product Overview & Core Advantages
The 708 CD/P4ADBA is a duplex back-to-back (DB) matched pair of metric precision angular contact ball bearings. This specific arrangement is engineered to provide exceptional rigidity and stability, making it ideal for applications requiring high running accuracy under combined radial and axial loads. Manufactured to the exacting P4A tolerance class and featuring an extra light (Class A) preload, this bearing set delivers superior rotational precision and is optimized for high-speed operation up to 110,000 rpm. The phenolic cage contributes to smooth performance at high velocities.
708 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 708 CD | Basic bearing designation for a metric angular contact ball bearing with specific internal geometry. |
| P4A | Indicates a high-precision tolerance class, exceeding ABEC 7 standards, for applications demanding extreme running accuracy. |
| DB | Signifies the Duplex Back-to-Back mounting arrangement. This configuration provides high moment rigidity and is best for withstanding overturning moments. |
| A | Denotes the Extra Light (Class A) preload. This preload eliminates internal clearance, enhancing stiffness and positioning accuracy while minimizing noise and vibration. |
708 CD/P4ADBA Bearing Structural Features & Performance Benefits
- Superior Rigidity and Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, ensuring precise shaft positioning.
- High-Speed Capability: The combination of a lightweight phenolic resin cage, a 15° contact angle, and optimized internal design allows for a very high limiting speed of 110,000 rpm.
- Precision Performance: Manufactured to P4A tolerance class with tight dimensional control on the bore diameter (8 mm), outside diameter (22 mm), and width (14 mm), guaranteeing consistent, high-accuracy performance.
- Optimized Load Capacity: The angular contact design enables the bearing set to handle significant combined loads (radial and axial), with a dynamic load rating of 1186 lbf and a static load rating of 619 lbf.
- Durable Construction: Components made from chrome steel for both rings and balls ensure high durability, fatigue resistance, and a long operational life.
708 CD/P4ADBA Bearing Typical Application Areas
This high-precision, high-speed bearing set is typically specified in demanding applications such as:
- Machine Tool Spindles for CNC milling and grinding machines
- High-Frequency Spindles
- Precision Gearboxes
- High-Speed Motors and Encoders
- Medical and Dental Handpieces
- Aerospace Actuation Systems
