709 ACD/P4ADBC
Miniature Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
709 ACD/P4ADBC
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
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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709 ACD/P4ADBC Bearing Product Overview & Core Advantages
The 709 ACD/P4ADBC is a precision duplex angular contact ball bearing set, designed for applications demanding high rigidity and running accuracy. This back-to-back (DB) arrangement is preloaded to Moderate / Class C specifications, enabling it to withstand significant combined loads (radial and axial) from both directions simultaneously. Manufactured to an exceptionally tight P4A tolerance class, it is ideal for high-speed spindles and other precision machinery where minimal runout and high operational stability are critical.
709 ACD/P4ADBC 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 (two-bearing) set. |
| P4A | Denotes a high-precision tolerance class, exceeding ABEC 7 standards. |
| DB | Specifies the Back-to-Back mounting arrangement, which provides high moment rigidity. |
| C | Indicates the Moderate preload level applied to the matched set. |
709 ACD/P4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity and Stability: The back-to-back (DB) duplex arrangement creates a widely spaced load zone, significantly increasing the system's resistance to moment loads and enhancing operational stiffness.
- Superior Load Capacity: The 25° contact angle is optimized to handle substantial axial loads in both directions, in addition to radial loads, making it suitable for combined loading conditions.
- Precision High-Speed Performance: The Phenolic cage offers excellent strength-to-weight ratio and smooth operation at the high limiting speed of 220,000 rpm. The P4A tolerance class ensures low vibration and heat generation.
- Durable Construction: Both rings and balls are made from high-grade Chrome Steel, providing excellent wear resistance and long service life under demanding conditions.
709 ACD/P4ADBC Bearing Typical Application Areas
This bearing is engineered for high-performance applications, including:
- High-Frequency Spindles for PCB drilling and precision machining
- Precision Grinding Spindles
- High-Speed Machine Tool Axles
- Medical and Dental Handpiece Drives
- Advanced Robotics and Automation components
