71911 CE/HCPA9AQBCA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71911 CE/HCPA9AQBCA
Basic Information
System of measurement
Metric
Weight
0.58 kg
Tolerance class
PA9A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
55 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
80 mm
Outside diameter tolerance
-0.004mm to 0
Width
52 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
9225 lbf
Radial static load rating
9562 lbf
Limiting speed
34 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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71911 CE/HCPA9AQBCA Bearing Product Overview & Core Advantages
The 71911 CE/HCPA9AQBCA is a high-precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched set features an extra light preload (Class A) and a back-to-back quadruplex arrangement (QBC), enabling it to handle complex combined loads including radial and significant axial loads in both directions simultaneously. Manufactured to an ultra-precise PA9A tolerance class and utilizing ceramic balls and a phenolic cage, it delivers superior high-speed performance, reduced friction, and extended service life in critical machinery.
71911 CE/HCPA9AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71911 | Basic bearing series and size designation (55mm bore, 80mm OD). |
| CE | Contact angle of 15°. |
| HCPA9A | Indicates the ultra-high precision tolerance class PA9A and specific internal design for matched sets. |
| QBC | Specifies the Quadruplex Back-to-Back matched arrangement of four bearings. |
71911 CE/HCPA9AQBCA Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Stability: The quadruplex back-to-back (QBC) arrangement creates an extremely rigid bearing system, effectively resisting moment loads and maintaining shaft alignment under heavy combined loads.
- Superior High-Speed Capability: The combination of lightweight ceramic balls and a phenolic resin cage significantly reduces centrifugal forces and friction, enabling a high limiting speed of 34,000 rpm.
- Optimized Preload for Precision: The extra light preload (Class A) minimizes axial and radial play, ensuring high running accuracy, reduced vibration, and precise positioning—essential for ultra-precision applications.
- High-Temperature & Long-Life Performance: The phenolic cage offers excellent dimensional stability and low moisture absorption, while the open design allows for effective circulation of oil or specialty grease, supporting operation within a temperature range of -30°C to 110°C.
71911 CE/HCPA9AQBCA Bearing Typical Application Areas
This bearing is engineered for the most demanding high-precision and high-speed rotational systems, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers requiring extreme rigidity and accuracy.
- Precision Robotics: In robotic arm joints and spindle drives where minimal deflection and high positional repeatability are critical.
- Aerospace & Defense Systems: In gyroscopes, radar systems, and other instrumentation requiring the highest levels of precision and reliability.
- High-Frequency Motors and Spindles: For PCB drilling, semiconductor manufacturing equipment, and other applications demanding very high rotational speeds.
