71904 ACDGD/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71904 ACDGD/P4A Bearing Product Overview & Core Advantages
The 71904 ACDGD/P4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rigidity and accuracy. Designed to accommodate primarily axial loads in one direction, this bearing features a 25° contact angle and P4A super-precision tolerance for superior running accuracy. Its heavy preload (Class D) ensures maximum system stiffness and minimal deflection under operational stresses. The phenolic cage and universal matching capability make it ideal for high-speed spindle arrangements where thermal stability and precise axial positioning are critical.
71904 ACDGD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Basic bearing series with 20mm bore, 37mm OD, 9mm width |
| AC | Angular Contact design with 25° contact angle |
| D | Heavy preload (Class D) for maximum rigidity |
| GD | Grease lubricated with specific quantity and type |
| P4A | Super precision tolerance class for high-accuracy applications |
71904 ACDGD/P4A Bearing Structural Features & Performance Benefits
High Rigidity & Precision: The 25° contact angle combined with heavy preload (Class D) delivers exceptional system stiffness, minimizing deflection during high-speed operation. The P4A tolerance class ensures precise running accuracy for demanding applications.
Optimized High-Speed Performance: The phenolic resin cage provides excellent strength-to-weight ratio and thermal stability, enabling operation at 75,000 rpm limiting speed. The cage design reduces friction and allows for efficient lubrication distribution.
Superior Load Capacity: With a dynamic load rating of 1287 lbf and static load rating of 686 lbf, this bearing handles significant axial loads while maintaining precision. The optimized ball complement (15 balls) and 4.762 mm ball diameter provide balanced load distribution.
Universal Matching Capability: Designed as Universal Matchable (SU), these bearings can be paired in sets of three for back-to-back or face-to-face arrangements, enabling customized preload and stiffness configurations for complex spindle designs.
71904 ACDGD/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and precision lathes
- Precision Instrumentation: Measuring equipment, optical instruments, and laboratory devices
- High-Speed Motors: Spindle motors, servo motors, and high-frequency applications
- Medical Equipment: Dental handpieces, surgical tools, and diagnostic imaging systems
- Aerospace Components: Gyroscopes, navigation systems, and auxiliary power units
