71913 ACD/P4ATBTA
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 71913 ACD/P4ATBTA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This triplex back-to-back matched set delivers superior performance under combined radial and axial loads. Manufactured to P4A tolerance class with an extra light preload (Class A), it ensures minimal runout and vibration, making it ideal for high-speed, high-rigidity spindles and precision machinery where positional accuracy is critical.
71913 ACD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71913 | Basic bearing series and size designation (65mm bore, 90mm OD) |
| ACD | Angular Contact design with a 25° contact angle |
| P4A | High Precision Tolerance Class (exceeds ABEC 7/ISO P4) |
| TB | Triplex Back-to-Back matched arrangement |
| TA | Universal matching designation (specifically matched as a set of 3) |
Structural Features and Performance Benefits
Exceptional Rigidity: The triplex back-to-back configuration creates an extremely rigid bearing system capable of withstanding heavy combined loads and moments, ensuring stable operation under demanding conditions.
High-Speed Capability: Featuring a phenolic resin cage that reduces centrifugal forces and friction, enabling operation at limiting speeds up to 36,000 rpm. The optimized internal geometry further enhances high-speed performance.
Precision Engineering: Manufactured to P4A tolerance standards with precisely controlled bore and outside diameter tolerances (±0.004mm) for exact fitment and minimal runout in precision applications.
Superior Load Capacity: With a dynamic load rating of 9518 lbf and static load rating of 10800 lbf, this bearing set delivers reliable performance under significant operational stresses.
71913 ACD/P4ATBTA Bearing Typical Application Areas
This precision bearing set is specifically engineered for applications requiring the highest levels of accuracy and rigidity:
- Machine Tool Spindles - High-speed milling, grinding, and turning centers
- Precision Robotics - High-accuracy robotic arms and positioning systems
- Aerospace Components - Guidance systems and precision actuators
- Medical Equipment - High-speed dental handpieces and surgical tools
- Test and Measurement Instruments - Coordinate measuring machines and optical systems
