71944 ACD/P4AQBCA
71900 Series Super Precision Angular Contact Ball Bearings
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71944 ACD/P4AQBCA Bearing Product Overview & Core Advantages
The 71944 ACD/P4AQBCA is a high-precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. Engineered as a matched set of four bearings in a back-to-back arrangement (QBC), it delivers superior performance under combined radial and axial loads. Manufactured to P4A tolerance class, this bearing offers extremely tight dimensional control for applications where high rotational accuracy and minimal runout are critical. Its extra light preload (Class A) ensures smooth operation with minimal friction, making it ideal for high-speed spindle systems.
71944 ACD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Performance Implication |
|---|---|---|
| 71944 | Basic bearing series with 220mm bore, 300mm OD | Standard dimension reference |
| ACD | Angular Contact Design with 25° contact angle | Optimized for axial load capacity |
| P4A | High precision tolerance class | Exceptional running accuracy and dimensional stability |
| QBC | Quadruplex Back-to-Back arrangement | Maximum rigidity and moment load capacity |
71944 ACD/P4AQBCA Bearing Structural Features & Performance Benefits
Enhanced Rigidity & Load Distribution: The quadruplex back-to-back configuration creates an extremely rigid bearing system capable of withstanding heavy combined loads and significant moment loads. This arrangement provides superior stability for precision machining operations.
Precision Engineering: Manufactured to P4A tolerance standards with bore and outside diameter tolerances of -0.004mm to 0, ensuring exceptional dimensional accuracy and consistent performance across all four bearings in the set.
High-Speed Capability: The phenolic cage material provides excellent strength-to-weight ratio, contributing to the bearing's ability to achieve limiting speeds of 11,000 rpm while maintaining stability and minimizing centrifugal forces.
Superior Load Capacity: With a dynamic load rating of 124,425 lbf and static load rating of 256,500 lbf, this bearing set offers exceptional durability and long service life under demanding operating conditions.
Optimized Contact Design: The 25° contact angle is engineered to provide optimal balance between radial and axial load capacity, making it suitable for applications requiring bidirectional thrust loads.
71944 ACD/P4AQBCA Bearing Typical Application Areas
- Machine Tool Spindles: High-precision milling, grinding, and turning centers requiring extreme rigidity and accuracy
- High-Speed Machining Centers: Applications demanding both high rotational speeds and heavy cutting loads
- Precision Gearboxes: Industrial transmission systems requiring minimal deflection and high positional accuracy
- Aerospace Test Equipment: Precision positioning systems and simulation equipment
- Medical Equipment Spindles: High-precision medical manufacturing and processing equipment
- Robotic Automation: High-accuracy robotic arms and precision positioning systems
