71911 CB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71911 CB/P4A
Basic Information
System of measurement
Metric
Weight
0.18 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
55 mm
Bore diameter tolerance
-0.007mm to 0
Outside diameter
80 mm
Outside diameter tolerance
-0.007mm to 0
Width
13 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
5.556 mm
Ball quantity
28
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
2239 lbf
Radial static load rating
1834 lbf
Limiting speed
34 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:
$ 478.92
/ each
In Stock
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71911 CB/P4A Bearing Product Overview & Core Advantages
The 71911 CB/P4A is a single-row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and rigidity. Manufactured to P4 (ABEC-7) tolerance class, this bearing is preloaded and optimized to handle significant combined loads (radial and axial) in one direction. Its compact design, with a 55 mm bore and 13 mm width, makes it ideal for space-constrained, high-speed machinery where high rigidity and minimal runout are critical for performance.
71911 CB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| CB | Specific internal design and contact angle for optimized load distribution and high rigidity. |
| P4A | Denotes a P4 (ABEC-7) tolerance class with specific dimensional and running accuracy requirements for precision applications. |
71911 CB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The 15° contact angle and preload configuration provide superior axial and radial stiffness, minimizing deflection under load and ensuring precise shaft positioning essential for high-speed operation.
- Optimized Load Capacity: Engineered to support substantial combined loads, making it suitable for applications with simultaneous radial and one-direction axial forces.
- High-Speed Capability: The phenolic resin cage offers low friction, excellent acceleration characteristics, and dimensional stability at high speeds, contributing to a limiting speed of 34,000 rpm.
- Precision Materials: Constructed from chrome steel for rings and balls, ensuring high durability, wear resistance, and consistent performance within a temperature range of -30°C to 110°C.
71911 CB/P4A Bearing Typical Application Areas
This precision angular contact bearing is widely used in:
- Machine Tool Spindles
- High-Speed Machining Centers
- Precision Grinding Spindles
- Industrial Pumps & Compressors
- Robotic Arm Joints & Precision Gearboxes
