71928 ACD/P4ATBTC
71900 Series Super Precision Angular Contact Ball Bearings
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71928 ACD/P4ATBTC Bearing Product Overview & Core Advantages
The 71928 ACD/P4ATBTC is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched triplex back-to-back arrangement provides superior stability and can accommodate combined radial and axial loads. Manufactured to P4A tolerance class with a moderate preload (Class C), it ensures reliable performance in high-speed and high-rigidity scenarios. The phenolic cage and optimized 25° contact angle contribute to its outstanding operational characteristics.
71928 ACD/P4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71928 | Basic bearing designation (140mm bore, 190mm OD) |
| ACD | Angular Contact Design with 25° contact angle |
| P4A | High precision tolerance class (superior to ABEC 7) |
| TBT | Triplex Back-to-Back matched arrangement |
| C | Moderate preload classification |
71928 ACD/P4ATBTC Bearing Structural Features & Performance Benefits
Exceptional Rigidity: The triplex back-to-back configuration creates a highly rigid bearing system that minimizes deflection under heavy loads, making it ideal for applications requiring precise positioning and minimal deformation.
Superior Load Capacity: With a radial dynamic load rating of 43,875 lbf and static load rating of 75,375 lbf, this bearing handles significant combined radial and axial loads efficiently. The 25° contact angle optimizes axial load carrying capacity while maintaining good radial performance.
High-Speed Capability: The phenolic cage material provides excellent strength-to-weight ratio, contributing to the bearing's ability to reach limiting speeds of 11,000 rpm. The optimized internal geometry reduces friction and heat generation.
Precision Engineering: Manufactured to P4A tolerance standards with tight dimensional control (bore tolerance: -0.004mm to 0), this bearing ensures consistent performance and precise running accuracy in critical applications.
71928 ACD/P4ATBTC Bearing Typical Application Areas
The 71928 ACD/P4ATBTC is specifically engineered for high-performance machinery including:
- Machine Tool Spindles - Providing the rigidity and precision required for high-speed machining operations
- Precision Grinding Spindles - Ensuring minimal runout and vibration in demanding grinding applications
- High-Speed Industrial Pumps - Handling combined loads in critical pumping systems
- Aerospace Positioning Systems - Delivering accuracy and reliability in navigation and control systems
- Medical Equipment Spindles - Meeting the stringent requirements of medical imaging and surgical devices
