71909 ACD/P4A
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71909 ACD/P4A
Basic Information
System of measurement
Metric
Weight
0.13 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
45 mm
Bore diameter tolerance
-0.006mm to 0
Outside diameter
68 mm
Outside diameter tolerance
-0.007mm to 0
Width
12 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
23
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
2790 lbf
Radial static load rating
2025 lbf
Limiting speed
28 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
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
Price:
$ 352.99
/ each
In Stock
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71909 ACD/P4A Bearing Product Overview & Core Advantages
The 71909 ACD/P4A is a single-row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and rigidity. Engineered to a P4 (ABEC-7) tolerance class, it delivers superior running precision. Its key advantage lies in its ability to accommodate combined radial and axial loads simultaneously, making it an ideal choice for high-speed spindles and precision machinery where high rigidity and minimal runout are critical. The bearing is pre-lubricated and features a phenolic cage optimized for high-speed operation.
71909 ACD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71909 | Basic bearing series and size designation. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies a high internal design and optimized ball complement. |
| /P4A | Indicates a P4 tolerance class (ABEC-7) for high precision and a specific internal clearance/geometry for preload availability. |
71909 ACD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The 25° contact angle and robust construction enable the bearing to support significant combined loads, providing excellent operational stability.
- High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces, contributing to a high limiting speed of 28,000 rpm. This makes it a premier high-speed bearing.
- Precision Engineering: Manufactured to P4 (ABEC-7) standards, it ensures minimal vibration and high running accuracy, which is essential for precision applications.
- Optimized for Preload: The bearing is supplied with a specific internal geometry that allows for the application of preload, further increasing system rigidity and positioning accuracy.
71909 ACD/P4A Bearing Typical Application Areas
This precision angular contact ball bearing is ideally suited for demanding applications, including:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Robotic Drives
- Medical and Dental Equipment
