71909 ACE/P4ADT
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71909 ACE/P4ADT
Basic Information
System of measurement
Metric
Weight
0.26 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
45 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
68 mm
Outside diameter tolerance
-0.004mm to 0
Width
24 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3578 lbf
Radial static load rating
2902 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Tandem (DT)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Available
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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71909 ACE/P4ADT Bearing Product Overview & Core Advantages
The 71909 ACE/P4ADT is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and reliability. This duplex tandem (DT) arrangement features two preloaded bearings, delivering superior high rigidity and the capacity to handle significant combined loads. Its P4A tolerance class ensures ultra-precise rotational performance, making it ideal for high-speed spindles and other precision machinery where uncompromising performance is critical.
71909 ACE/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71909 | Basic bearing series and size designation. |
| ACE | A specific internal design with a 25° contact angle optimized for high axial load capacity and high-speed operation. |
| P4A | Indicates an ultra-precision tolerance class with enhanced dimensional and running accuracy. |
| DT | Signifies a Duplex Tandem arrangement. Two bearings are mounted together to increase axial load capacity in one direction. |
71909 ACE/P4ADT Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex tandem configuration and 25° contact angle create an exceptionally stiff bearing unit capable of withstanding heavy combined radial and axial loads.
- Precision Performance: Manufactured to P4A tolerance class with a phenolic resin cage, this bearing ensures minimal vibration and high running accuracy, which is essential for high-speed applications.
- Optimized for Speed: The lightweight phenolic cage and precision-ground chrome steel components contribute to a high limiting speed of 41,000 rpm.
- Pre-lubricated & Ready-to-Install: The bearing comes lubricated from the factory, simplifying installation and ensuring immediate operational readiness.
71909 ACE/P4ADT Bearing Typical Application Areas
This bearing is engineered for high-performance machinery, including:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- High-Speed Pumps and Compressors
- Other equipment requiring high rigidity and ultra-precise rotation.
