71904 ACD/P4ATT
71900 Series Super Precision Angular Contact Ball Bearings
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71904 ACD/P4ATT Bearing Product Overview & Core Advantages
The 71904 ACD/P4ATT is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This P4A tolerance class bearing is supplied as a matched triplex tandem set (3-DT), enabling it to handle significant combined loads while maintaining extreme positional stability. Its 25° contact angle and preloaded configuration deliver superior high-speed performance and axial stiffness, making it ideal for high-precision spindles and other critical machinery components.
71904 ACD/P4ATT Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | 25° contact angle design, optimized for high rigidity and thrust capacity |
| P4A | High precision tolerance class exceeding ABEC 7 standards |
| TT | Tandem triplex arrangement (3 bearings preloaded in series) |
71904 ACD/P4ATT Bearing Structural Features & Performance Benefits
Optimized Rigidity: The triplex tandem arrangement creates an exceptionally rigid bearing system, capable of resisting deflection under heavy combined radial and axial loads. The preload configuration eliminates internal clearance, ensuring precise shaft positioning and vibration-free operation.
High-Speed Capability: Featuring a phenolic resin cage and precision-ground chrome steel balls, this bearing achieves a limiting speed of 75,000 rpm. The lightweight cage reduces centrifugal forces, while the optimized internal geometry minimizes friction and heat generation.
Precision Performance: Manufactured to P4A tolerance class with tight dimensional controls (bore and OD tolerance: -0.004mm to 0), this bearing ensures minimal runout and consistent performance in high-accuracy applications.
71904 ACD/P4ATT Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and precision lathes
- Precision Instrumentation: Measuring equipment, optical scanners, and coordinate measuring machines
- High-Speed Automation: Robotics, CNC rotary tables, and precision positioning systems
- Aerospace Components: Gyroscopes, navigation systems, and auxiliary power units
