71920 ACD/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71920 ACD/P4A
Basic Information
System of measurement
Metric
Weight
0.8 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
100 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
140 mm
Outside diameter tolerance
-0.009mm to 0
Width
20 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
12.7 mm
Ball quantity
26
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
12870 lbf
Radial static load rating
14175 lbf
Limiting speed
12 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:
$ 284.59
/ each
In Stock
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71920 ACD/P4A Bearing Product Overview & Core Advantages
The 71920 ACD/P4A is a single-row angular contact ball bearing engineered for high-precision and high-speed applications. This metric bearing is distinguished by its P4 (ABEC-7) tolerance class, ensuring exceptional running accuracy. Its primary advantage lies in its ability to accommodate significant combined loads—simultaneously handling radial and axial loads in one direction—thanks to its specific 25° contact angle. The phenolic cage and preload availability contribute to superior operational stability and rigidity, making it an ideal choice for demanding, precision machinery where reliability is paramount.
71920 ACD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71920 | Basic bearing series and size designation (100mm bore, 140mm OD, 20mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates a high internal capacity design. |
| P4A | Specifies a P4 (ABEC-7) tolerance class with specific dimensional and running accuracy requirements. |
71920 ACD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to P4 tolerance class, this bearing provides extremely low runout and high dimensional stability, which is critical for applications requiring precise shaft positioning.
- Optimized Load Capacity: The 25° contact angle is engineered to support substantial axial loads in one direction in addition to radial loads, making it suitable for combined load conditions.
- Superior High-Speed Performance: The lightweight and robust phenolic resin cage ensures stable operation and reduced centrifugal forces, enabling the bearing to achieve its high limiting speed of 12,000 rpm.
- Preload Availability: The bearing can be supplied with a preload, which increases system stiffness, minimizes axial and radial play, and enhances rotational accuracy.
71920 ACD/P4A Bearing Typical Application Areas
This precision angular contact ball bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Aerospace Control Systems
- Medical and Dental Equipment
