71944 ACD/P4AQBCB
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 71944 ACD/P4AQBCB is a high-precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and load capacity. This matched set features a back-to-back (QBC) arrangement that provides superior stability when handling combined loads (radial and axial). Manufactured to P4A tolerance class, it delivers outstanding running accuracy, making it ideal for high-speed spindles and precision machinery. The pre-lubricated design with a light preload (Class B) ensures optimal performance from installation, reducing setup complexity and enhancing operational reliability.
71944 ACD/P4AQBCB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71944 | Basic bearing series and size designation |
| ACD | Angular Contact Design with 25° contact angle |
| P4A | High precision tolerance class (superior to ABEC 7) |
| QBC | Quadruplex Back-to-Back matched arrangement |
| B | Light preload classification |
Structural Features and Performance Benefits
Enhanced Rigidity and Load Distribution: The quadruplex back-to-back configuration creates a highly rigid bearing system that effectively distributes combined loads across all four bearing units. This arrangement significantly increases system stability and minimizes deflection under heavy operating conditions.
Superior Load Capacity: With a dynamic load rating of 124,425 lbf and static load rating of 256,500 lbf, this bearing set handles substantial radial and axial loads simultaneously. The 25° contact angle optimizes axial load carrying capability while maintaining excellent radial performance.
High-Speed Capability: The phenolic cage material provides excellent strength-to-weight ratio, contributing to the bearing's ability to operate at limiting speeds up to 11,000 rpm. The precision-ground chrome steel components ensure smooth operation and minimal vibration at high rotational speeds.
Precision Engineering: Manufactured to P4A tolerance standards with tight dimensional controls (bore and OD tolerance: -0.004mm to 0), this bearing delivers exceptional running accuracy and consistent performance in precision applications.
71944 ACD/P4AQBCB Bearing Typical Application Areas
- Machine Tool Spindles: High-precision milling, grinding, and turning centers requiring extreme accuracy and rigidity
- High-Speed Machining Centers: Applications demanding superior rotational accuracy and thermal stability
- Precision Gearboxes: Industrial transmission systems requiring high load capacity and minimal deflection
- Aerospace Components: Critical rotating assemblies where reliability and precision are paramount
- Specialized Industrial Machinery: Applications requiring matched bearing sets for optimal preload and performance characteristics
