709 ACD/P4ADBB
Miniature Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
709 ACD/P4ADBB
Basic Information
System of measurement
Metric
Weight
0.03 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
9 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
24 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
10
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1244 lbf
Radial static load rating
698 lbf
Limiting speed
220 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
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
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709 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 709 ACD/P4ADBB is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement consists of two matched bearings, preloaded to deliver superior high rigidity and stability under complex combined loads. Its P4A tolerance class ensures ultra-precise running, making it ideal for high-speed spindles and precision machinery where minimal runout and high reliability are critical.
709 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle, optimized for carrying combined radial and axial loads. |
| P4A | High precision tolerance class, providing extremely tight dimensional and running accuracy. |
| DB | Duplex Back-to-Back arrangement. Two bearings are mounted facing away from each other, providing high moment rigidity. |
709 ACD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) configuration with light preload (Class B) creates a rigid bearing system that effectively resists moment loads and shaft deflection, ensuring precise positioning.
- Superior Load Capacity: The 25° contact angle and robust construction enable the bearing to handle significant combined radial and axial loads simultaneously.
- High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the open design and factory lubrication contribute to a high limiting speed of 220,000 rpm.
- Precision Engineering: Manufactured to P4A tolerance class with tight bore, OD, and width tolerances for exceptional running accuracy and low vibration in high-speed applications.
709 ACD/P4ADBB Bearing Typical Application Areas
This bearing is specifically engineered for high-performance applications, including:
- Machine Tool Spindles (High-speed machining centers, grinding spindles)
- Precision Grinding Equipment
- High-Frequency Motors
- Medical and Dental Handpieces
- Aerospace Instrumentation
