71809 ACD/P4DGA
71800 Series Super Precision Angular Contact Ball Bearings
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71809 ACD/P4DGA Bearing Product Overview & Core Advantages
The 71809 ACD/P4DGA is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and reliability. This P4 tolerance class bearing features a universal matchable (SU) design, allowing two bearings to be mounted in any combination to achieve the required preload and rigidity. Its 25° contact angle and extra light preload (Class A) make it ideal for handling combined radial and axial loads simultaneously. The phenolic cage and optimized internal geometry contribute to superior high-speed performance, making this bearing a top choice for precision machinery.
71809 ACD/P4DGA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Performance Advantage |
|---|---|---|
| ACD | 25° Contact Angle, Universal Matchable Design | Optimized for combined loads and flexible mounting configurations |
| P4 | High Precision Tolerance Class | Superior running accuracy and dimensional stability |
| DGA | Phenolic Cage Material | Enhanced high-speed capability and reduced friction |
71809 ACD/P4DGA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The dual-row angular contact design provides exceptional stiffness, enabling the bearing to handle significant combined radial and axial loads while maintaining precision alignment.
Superior High-Speed Performance: The phenolic cage and optimized internal geometry contribute to a limiting speed of 46,000 rpm, making it suitable for high-speed spindle applications.
Precision Engineering: Manufactured to P4 tolerance class with tight dimensional controls (bore diameter tolerance: -0.004mm to 0), ensuring consistent performance in precision applications.
Universal Matching Capability: The SU designation allows two bearings to be mounted in any combination (face-to-face, back-to-back, or tandem) to achieve optimal preload and system rigidity.
71809 ACD/P4DGA Bearing Typical Application Areas
- Machine Tool Spindles - High-speed machining centers and precision grinding machines
- Precision Instrumentation - Measuring equipment and laboratory instruments
- High-Speed Motors - Spindle motors and high-frequency applications
- Medical Equipment - Dental handpieces and surgical tools
- Aerospace Components - Guidance systems and precision actuators
