71911 ACD/P4ATGB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71911 ACD/P4ATGB
Basic Information
System of measurement
Metric
Weight
0.54 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
39 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
23
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
8932 lbf
Radial static load rating
9338 lbf
Limiting speed
46 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Light / Class B
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 ACD/P4ATGB Bearing Product Overview & Core Advantages
The 71911 ACD/P4ATGB is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This universal matchable bearing belongs to the P4A tolerance class, ensuring ultra-precise dimensions and runout for high-performance systems. Its key advantage lies in its ability to accommodate combined loads (radial and axial) efficiently while operating at high speeds. The light preload (Class B) minimizes deflection under operational stresses, providing superior system stiffness and positioning accuracy, making it ideal for high-reliability and high-precision applications.
71911 ACD/P4ATGB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Designates a 25° contact angle and specific internal geometry optimized for high axial load capacity and rigidity. |
| P4A | Indicates a super-precision tolerance class with extremely tight limits on bore, outside diameter, and width tolerances for superior running accuracy. |
| TGB | Specifies the use of a phenolic (resin) cage, which offers low weight, high strength, and excellent performance at high speeds with minimal friction. |
71911 ACD/P4ATGB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The 25° contact angle and optimized internal geometry enable the bearing to support significant combined radial and axial loads. The light preload enhances system rigidity by eliminating internal clearance, reducing vibration and improving machining or positioning accuracy.
- High-Speed Performance: The lightweight and robust phenolic cage (TGB) ensures stable operation and reduced centrifugal forces, contributing to the high limiting speed of 46,000 rpm. This makes it suitable for very high-speed spindle applications.
- Precision Engineering: Manufactured to P4A super-precision standards with tight dimensional tolerances, this bearing guarantees minimal runout and consistent performance in the most demanding precision equipment.
- Universal Matchability (SU): These bearings are universally matchable, meaning they can be mounted in any combination (back-to-back, face-to-face, or tandem) without pre-selection, simplifying installation and providing flexible configuration options for complex bearing arrangements.
71911 ACD/P4ATGB Bearing Typical Application Areas
This bearing is engineered for high-precision, high-speed applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and rotary actuators requiring high rigidity and accuracy.
- High-Frequency Motors and Spindles: Applications in PCB drilling, dental drills, and small tool spindles.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
