71904 CD/P4ATBTA
71900 Series Super Precision Angular Contact Ball Bearings
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71904 CD/P4ATBTA Bearing Product Overview & Core Advantages
The 71904 CD/P4ATBTA is a metric precision angular contact ball bearing designed for high-performance applications requiring exceptional rotational accuracy and rigidity. This bearing features a triplex back-to-back (TBT) matched arrangement with an extra light preload (Class A), delivering superior system stability and minimal runout. Its optimized 15° contact angle enables efficient handling of combined radial and axial loads, making it ideal for high-speed spindles and precision machinery where high rigidity and dimensional accuracy are critical.
71904 CD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Basic bearing series designation with 20mm bore, 37mm OD |
| CD | High contact angle (15°) optimized for axial load capacity |
| P4A | Ultra-precision tolerance class ensuring minimal dimensional variation |
| TBT | Triplex Back-to-Back arrangement for maximum system rigidity |
| A | Extra light preload for reduced friction and optimal high-speed performance |
71904 CD/P4ATBTA Bearing Structural Features & Performance Benefits
High Rigidity & System Stability: The triplex back-to-back arrangement creates a mechanically stable bearing system that significantly enhances overall machine rigidity, reducing deflection under heavy cutting forces or complex loading conditions.
Precision Performance: Manufactured to P4A tolerance class with bore and outside diameter tolerances of -0.004mm to 0, this bearing ensures exceptional running accuracy and minimal vibration for ultra-precise applications.
Optimized High-Speed Capability: The phenolic cage material provides excellent strength-to-weight ratio, while the 15° contact angle and extra light preload collectively enable smooth operation at the specified limiting speed of 100,000 rpm.
Enhanced Load Capacity: With a radial dynamic load rating of 2925 lbf and radial static load rating of 2171 lbf, this bearing configuration delivers reliable performance under demanding combined loading scenarios.
71904 CD/P4ATBTA Bearing Typical Application Areas
- High-speed machining centers and CNC spindle systems
- Precision grinding spindles requiring minimal runout
- High-frequency motor spindles for PCB drilling and milling
- Medical device manufacturing equipment demanding ultra-precise positioning
- Aerospace component machining applications
- Instrumentation and measuring devices requiring high rotational accuracy
