71920 CB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71920 CB/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
15 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
37
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
4860 lbf
Radial static load rating
5040 lbf
Limiting speed
19 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:
$ 1310.08
/ each
In Stock
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71920 CB/P4A Bearing Product Overview & Core Advantages
The 71920 CB/P4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and rigidity. Manufactured to P4 (ABEC-7) tolerance class, this bearing is designed to accommodate primarily axial loads in one direction and combined loads. Its compact design, featuring a 100 mm bore and 20 mm width, makes it ideal for space-constrained, high-speed spindles and precision machinery where high rigidity and minimal runout are critical. The phenolic cage and optimized internal geometry contribute to its superior high-speed performance.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71920 | Basic bearing series and size designation (100mm bore, 140mm OD, 20mm width). |
| CB | Specific internal design and contact angle of 15°, optimized for combined loads. |
| P4A | Indicates a P4 (ABEC-7) tolerance class with specific accuracy and running accuracy requirements. |
71920 CB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The single-row angular contact design with a 15° contact angle provides high axial rigidity and precise rotational guidance, essential for machine tool spindles. Manufactured to P4 tolerances, it ensures minimal vibration and runout.
- Superior High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, enabling stable operation at high rotational speeds up to 19,000 rpm. The open design facilitates efficient lubrication management.
- Optimized Load Capacity: Engineered to handle significant combined loads (radial and axial), with a dynamic load rating of 4860 lbf and a static load rating of 5040 lbf. The raceway and ball geometry are optimized for maximum load distribution.
- Pre-Lubricated for Immediate Service: The bearing is supplied lubricated, ready for installation and immediate operation within its specified temperature range of -30°C to 110°C.
71920 CB/P4A Bearing Typical Application Areas
This precision angular contact bearing is ideally suited for applications demanding high speed, accuracy, and rigidity, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and spindle drives requiring high positional accuracy.
- High-Frequency Motors and Spindles: Where minimal friction and heat generation are critical.
- Medical and Dental Equipment: High-speed handpieces and imaging scanner rotors.
- Aerospace Actuators and Instrumentation: Applications requiring reliable performance under precise control.
