71911 CD/HCP4ADBA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71911 CD/HCP4ADBA
Basic Information
System of measurement
Metric
Weight
0.3 kg
Tolerance class
P4A
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
26 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
23
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
7020 lbf
Radial static load rating
6525 lbf
Limiting speed
39 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
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 CD/HCP4ADBA Bearing Product Overview & Core Advantages
The 71911 CD/HCP4ADBA is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement provides superior stability and can accommodate combined radial and axial loads from both directions. Manufactured to P4A tolerance class and featuring ceramic balls, this bearing is engineered for high-speed operation and long service life in demanding, high-precision environments.
71911 CD/HCP4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71911 | Basic bearing series and size designation (55mm bore, 80mm OD). |
| C | 15° contact angle. |
| D | Indicates a duplex (two-bearing) set. |
| HC | Hybrid Ceramic: Signifies the use of ceramic balls. |
| P4A | High-precision tolerance class, exceeding ABEC 7/ISO P4 standards. |
| DB | Back-to-Back mounting arrangement for high moment rigidity. |
| A | Extra light preload applied to the matched set. |
71911 CD/HCP4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) design creates a wide, rigid support system that effectively resists moment loads and shaft deflection, ensuring precise alignment and minimal runout.
- Superior High-Speed Performance: The combination of a lightweight phenolic cage and low-density, high-hardness ceramic (Si3N4) balls reduces centrifugal forces, lowers operating temperatures, and enables a high limiting speed of 39,000 rpm.
- Extended Service Life & Reliability: Hybrid ceramic construction provides excellent wear resistance, reduced electrical arcing, and the ability to operate with minimal lubrication. The P4A precision grade ensures smooth, quiet, and vibration-free operation.
- Optimized Load Capacity: The 15° contact angle is ideal for applications with significant combined loads, offering a balanced performance for both radial and bidirectional axial forces.
71911 CD/HCP4ADBA Bearing Typical Application Areas
This bearing is ideally suited for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- High-Frequency Motors and Spindles: Especially in CNC and PCB drilling applications.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and auxiliary power units.
- Medical Equipment: Dental handpieces and high-speed centrifuges.
