71920 ACB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71920 ACB/P4A
Basic Information
System of measurement
Metric
Weight
0.85 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
7.938 mm
Ball quantity
37
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
4568 lbf
Radial static load rating
4770 lbf
Limiting speed
17 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:
$ 1310.01
/ each
In Stock
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71920 ACB/P4A Bearing Product Overview & Core Advantages
The 71920 ACB/P4A is a single-row angular contact ball bearing engineered for applications demanding high precision and superior running accuracy. Its defining characteristic is the 25° contact angle, which enables it to support significant combined loads—simultaneously handling radial forces and unidirectional axial thrust. Manufactured to a P4 (ABEC-7) tolerance class, this bearing is preloaded and comes pre-lubricated, making it an ideal, ready-to-install solution for high-speed spindles and other precision machinery where high rigidity and minimal runout are critical.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71920 | The basic bearing designation, indicating a metric, single-row angular contact ball bearing with a 100mm bore, 140mm OD, and 20mm width. |
| ACB | Signifies a specific internal design with a 25° contact angle and a specific cage and ball complement, optimized for high-precision applications. |
| P4A | Indicates the tolerance class P4 (ABEC-7) and that the bearing is supplied with a specific preload (A-designation), ensuring high running accuracy and immediate operational stability. |
71920 ACB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The single-row design with a 25° contact angle and P4 precision provides excellent dimensional stability and rotational accuracy, essential for minimizing deflection in high-speed applications.
- Superior Load Capacity: Engineered to handle combined radial and axial loads efficiently. With a dynamic load rating of 4568 lbf and a static load rating of 4770 lbf, it offers reliable performance under demanding conditions.
- Optimized High-Speed Performance: The phenolic resin cage is lightweight and robust, contributing to lower centrifugal forces and smoother operation at the high limiting speed of 17,000 rpm. The open design and effective lubrication facilitate optimal heat dissipation.
- Premium Materials: Constructed from chrome steel for both rings and balls, ensuring high durability, wear resistance, and a long operational lifespan.
71920 ACB/P4A Bearing Typical Application Areas
This high-precision angular contact ball bearing is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Drives: High-frequency motors and spindles.
- Robotics: Articulated arm joints and precision gearboxes.
- Medical Equipment: Dental handpieces and imaging device rotors.
- Aerospace Instrumentation: Gyroscopes and navigation system components.
