71911 CD/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71911 CD/HCP4ADGA
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
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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71911 CD/HCP4ADGA Bearing Product Overview & Core Advantages
The 71911 CD/HCP4ADGA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This universal matchable bearing features a 15° contact angle and an extra light preload (Class A), making it ideal for spindle arrangements where high rigidity and minimal deflection are critical. Its construction with ceramic balls and a phenolic cage enables superior high-speed performance, while the P4A tolerance class ensures extreme dimensional and running accuracy for the most precise machinery.
71911 CD/HCP4ADGA 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 | Enhanced internal design for optimized performance. |
| HC | Hybrid Ceramic construction (steel rings with ceramic balls). |
| P4A | High-precision tolerance class, exceeding ABEC 7/ISO P4 standards. |
| DG | Universal Matchable (Universal Duplex - "SU" arrangement). |
| A | Light preload classification. |
71911 CD/HCP4ADGA Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Design: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and extends bearing life, especially at high speeds (up to 39,000 rpm).
- Phenolic Cage: The lightweight and robust phenolic resin cage contributes to lower vibration, excellent acceleration characteristics, and stable operation at high rotational speeds.
- Universal Matchability (SU): These bearings are manufactured to be universally matchable. Any two bearings can be paired in a duplex set (DB or DF arrangement) without selective assembly, simplifying installation and ensuring optimal preload and stiffness.
- High-Precision P4A Grade: Tighter tolerances on bearing dimensions and running accuracy result in superior rotational precision, reduced noise, and enhanced system performance.
- Optimized Load Capacity: The 15° contact angle provides an excellent balance, enabling the bearing to handle significant combined loads (radial and axial) simultaneously.
71911 CD/HCP4ADGA Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC milling machines.
- Precision Instrumentation: High-resolution encoders, measuring devices, and scientific equipment.
- High-Frequency Motors: Spindles for PCB drilling and other applications requiring extreme rotational accuracy.
- Aerospace & Defense: Gyroscopes, navigation systems, and other critical rotating assemblies.
