71952 ACD/P4AQBCA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71952 ACD/P4AQBCA
Basic Information
System of measurement
Metric
Weight
48.8 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
260 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
360 mm
Outside diameter tolerance
-0.004mm to 0
Width
184 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
30.162 mm
Ball quantity
29
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
157950 lbf
Radial static load rating
360000 lbf
Limiting speed
4.5 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
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
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71952 ACD/P4AQBCA Bearing Product Overview & Core Advantages
The 71952 ACD/P4AQBCA is a precision angular contact ball bearing supplied as a Quadruplex Back-to-Back (QBC) matched set. Engineered to the exacting P4A tolerance class, this configuration is designed for applications demanding the highest levels of rotational accuracy, system rigidity, and load-carrying capacity. Its primary advantage lies in its ability to handle complex combined loads—significant radial and bidirectional axial loads—simultaneously, making it an ideal solution for high-performance, high-stiffness spindle systems.
71952 ACD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71952 | Standard bearing series and size designation. |
| ACD | Contact Angle of 25° and specific internal design optimizations. |
| P4A | Indicates a high-precision tolerance class with running accuracy requirements stricter than ABEC 7/ISO P4. |
| QBC | Denotes a Quadruplex Back-to-Back matched set of 4 bearings, pre-configured for maximum system rigidity and moment load capacity. |
71952 ACD/P4AQBCA Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Moment Load Capacity: The Quadruplex Back-to-Back (QBC) arrangement creates a highly stable, pre-stressed system that provides superior resistance to moment loads and operational deflection, ensuring maximum stiffness for the spindle assembly.
- High Load Capacity: The 25° contact angle and optimized internal geometry enable the bearing to support substantial combined radial and axial loads in both directions, a critical requirement for machining operations.
- Optimized High-Speed Performance: The lightweight, high-strength phenolic cage minimizes centrifugal forces, reduces friction, and contributes to a high limiting speed, making it suitable for demanding high-RPM applications.
- Precision and Reliability: Manufactured to P4A tolerances, this bearing ensures minimal runout and vibration, which is essential for achieving superior surface finishes and machining accuracy. The open seal type allows for efficient custom lubrication systems.
71952 ACD/P4AQBCA Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is specifically designed for the most demanding applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications requiring extreme accuracy and smooth operation.
- High-Frequency Machining Centers: Where superior dynamic stiffness is paramount.
- Other Precision Rotary Equipment: Such as high-performance rotary tables and precision drills.
