709 ACD/P4ADBA
Miniature Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
709 ACD/P4ADBA
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
Extra light / Class A
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
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709 ACD/P4ADBA Bearing Product Overview & Core Advantages
The 709 ACD/P4ADBA is a precision angular contact ball bearing designed for applications requiring exceptional accuracy and reliability. This duplex back-to-back (DB) matched set is preloaded to Extra Light (Class A) specifications, providing superior running accuracy and high rigidity. Its compact design, with a 9 mm bore and 24 mm outside diameter, is optimized for space-constrained, high-performance systems. The bearing is capable of handling combined loads, particularly thrust loads in both directions, making it an ideal solution for demanding high-speed applications.
709 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 709 AC | Basic bearing series with a 25° contact angle. |
| D | Indicates a duplex back-to-back (DB) matched bearing arrangement. |
| P4A | Denotes a high-precision tolerance class (superior to ABEC 7), ensuring minimal runout and vibration. |
| DB | Confirms the back-to-back mounting of the two bearings in the set. |
| A | Specifies the Extra Light preload level for optimal stiffness and positional accuracy. |
709 ACD/P4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Axial Stiffness: The duplex back-to-back (DB) arrangement creates a wide effective spread, significantly increasing the moment stiffness and providing exceptional resistance to overturning moments. This configuration is critical for maintaining precision under combined loads.
- Precision & High-Speed Performance: Manufactured to P4A tolerance class and featuring a lightweight phenolic resin cage, this bearing achieves excellent running accuracy and is capable of operating at high rotational speeds (limiting speed of 220,000 rpm). The 25° contact angle offers a balanced capacity for radial and axial loads.
- Superior Load Capacity: With a dynamic load rating of 1244 lbf and a static load rating of 698 lbf, this bearing set is engineered to handle significant combined loads reliably over a long service life.
- Optimized Material Selection: The use of high-grade chrome steel for both rings and balls ensures high durability, wear resistance, and consistent performance within a temperature range of -30°C to 110°C.
709 ACD/P4ADBA Bearing Typical Application Areas
This precision angular contact ball bearing is ideally suited for high-performance applications where accuracy, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Robotics: In robot arm joints and gears requiring high positional accuracy.
- High-Frequency Spindles: Used in PCB drilling and semiconductor manufacturing equipment.
- Medical Equipment: In dental handpieces and high-speed centrifuges.
- Optical and Measuring Instruments: Where minimal runout and vibration are critical.
