71904 ACDGC/P4A
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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71904 ACDGC/P4A Bearing Product Overview & Core Advantages
The 71904 ACDGC/P4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and rigidity. This single row bearing features a 25° contact angle and is supplied with a Moderate (Class C) preload, ensuring optimal stiffness and minimal axial and radial runout. Its P4A tolerance class signifies superior dimensional and running accuracy, making it ideal for high-speed spindles and precision machinery. The bearing is universally matchable (SU), allowing for flexible mounting arrangements in sets to handle complex combined loads.
71904 ACDGC/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Basic bearing series and size designation (20mm bore, 37mm OD, 9mm width). |
| AC | Angular Contact design, optimized for combined radial and axial loads. |
| D | High contact angle of 25°. |
| GC | Internal clearance group and preload designation for Moderate / Class C preload. |
| P4A | Super-precision tolerance class, exceeding ABEC-7/ISO P4 standards for enhanced running accuracy. |
71904 ACDGC/P4A Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The 25° contact angle and Class C preload provide superior stiffness, effectively resisting operational deflections under significant combined loads (radial and axial).
High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces, while the optimized internal geometry and pre-lubrication contribute to a high limiting speed of 75,000 rpm.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls on bore diameter, outside diameter, and width, ensuring smooth, quiet, and vibration-free operation.
Material Quality: Constructed from high-grade chrome steel for rings and balls, offering excellent wear resistance and long service life.
71904 ACDGC/P4A Bearing Typical Application Areas
The 71904 ACDGC/P4A is engineered for high-performance applications where precision and speed are critical. Key sectors include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: Measuring devices and optical equipment.
- High-Frequency Motors and Spindles: PCB drilling spindles and dental handpieces.
- Robotics: High-accuracy joints and actuators.
