71904 ACD/P4ATBTA
71900 Series Super Precision Angular Contact Ball Bearings
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71904 ACD/P4ATBTA Bearing Product Overview & Core Advantages
The 71904 ACD/P4ATBTA is a super-precision angular contact ball bearing designed for the most demanding applications. As part of a triplex back-to-back (TBT) matched set, it delivers exceptional system rigidity and rotational accuracy. Its P4A tolerance class and extra light preload (Class A) ensure smooth, high-speed operation with minimal vibration, making it ideal for machine tool spindles and other high-performance machinery requiring superior running accuracy and stability under combined radial and axial loads.
71904 ACD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Basic bearing series and size designation (20mm bore, 37mm OD). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates a duplex bearing, which is supplied as part of a pre-matched set. |
| P4A | Denotes a super-precision tolerance class, exceeding ABEC 7/ISO P4 standards for enhanced running accuracy. |
| TBT | Specifies the Triplex Back-to-Back arrangement of the three-bearing matched set. |
| A | Identifies the extra light preload (Class A) applied to the matched set. |
71904 ACD/P4ATBTA Bearing Structural Features & Performance Benefits
High Rigidity and Stability: The triplex back-to-back (TBT) arrangement creates an extremely rigid bearing system that effectively resists moment loads and maintains shaft positioning under heavy combined loads.
Super-Precision Performance: Manufactured to P4A tolerance class with tight dimensional control on bore diameter, outside diameter, and width, this bearing ensures minimal runout and vibration for superior application performance.
Optimized for High-Speed Operation: The lightweight phenolic cage and 25° contact angle are engineered to reduce centrifugal forces and friction, enabling a high limiting speed of 100,500 rpm.
Superior Load Capacity: With a radial dynamic load rating of 2790 lbf and a radial static load rating of 2059 lbf, it reliably handles significant combined loads.
Pre-Lubricated for Immediate Use: The bearing comes lubricated and ready for installation, suitable for a standard operating temperature range of -30°C to 110°C.
71904 ACD/P4ATBTA Bearing Typical Application Areas
The 71904 ACD/P4ATBTA is engineered for high-precision, high-speed machinery, including:
- Machine Tool Spindles: For CNC machining centers, grinding spindles, and lathes requiring extreme accuracy and rigidity.
- High-Frequency Spindles: Used in PCB drilling and precision engraving applications.
- Precision Instrumentation: Critical components in measuring devices and optical scanners.
- Robotics: High-accuracy joints and arm assemblies.
