71911 CD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71911 CD/P4ADBA
Basic Information
System of measurement
Metric
Weight
0.36 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
34 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
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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71911 CD/P4ADBA Bearing Product Overview & Core Advantages
The 71911 CD/P4ADBA is a metric precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) matched set delivers superior performance in handling combined loads, offering high resistance to moment loads. Manufactured to P4A tolerance class with an extra light preload (Class A), it ensures smooth, quiet operation and is pre-lubricated for immediate use, making it an ideal choice for high-precision, high-rigidity systems.
71911 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71911 | Basic bearing series, indicating a high-precision angular contact design with a 55mm bore, 80mm OD, and 26mm width. |
| C | Specifies a 15° contact angle, optimized for high-speed operation and moderate axial load capacity. |
| D | Indicates a duplex back-to-back (DB) arrangement of two matched bearings, providing high rigidity against moment loads. |
| P4A | Denotes an ultra-high precision tolerance class with enhanced running accuracy and dimensional stability. |
| DBA | Signifies a specific preload grade (Extra light / Class A) for minimal friction and optimal high-speed performance. |
71911 CD/P4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide effective spread, significantly increasing system rigidity and stability, making it exceptionally resistant to tilting moments and complex loads.
- Superior Precision: Manufactured to P4A tolerance class with extremely tight dimensional tolerances (bore/OD: -0.004mm to 0), ensuring minimal runout and superior rotational accuracy for critical applications.
- Optimized High-Speed Capability: The 15° contact angle and phenolic resin cage reduce centrifugal forces and friction, enabling a high limiting speed of 34,000 rpm. The Class A preload further ensures precise shaft positioning and smooth operation at high velocities.
- Robust Load Capacity: With a dynamic load rating of 7020 lbf and static load rating of 6525 lbf, this bearing set is engineered to handle significant combined radial and axial loads simultaneously.
- Premium Materials: Constructed from chrome steel for rings and balls, providing high hardness, wear resistance, and long service life under demanding conditions.
71911 CD/P4ADBA Bearing Typical Application Areas
This high-precision duplex bearing set is ideally suited for applications where extreme accuracy, rigidity, and speed are paramount. Key industries and machinery include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Medical Equipment: Dental handpieces, centrifuges, and imaging scanners.
- Aerospace & Defense: Gyroscopes, radar systems, and navigation instruments.
- High-Frequency Motors and Spindles: Where low vibration and high running accuracy are critical.
