71809 ACD/P4DGB
71800 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
Ball & Washer Dimensions
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71809 ACD/P4DGB Bearing Product Overview & Core Advantages
The 71809 ACD/P4DGB is a precision angular contact ball bearing engineered for high-performance applications requiring exceptional rotational accuracy and rigidity. This universal matchable (SU) bearing features a light preload (Class B) and P4 tolerance class, making it ideal for machine tool spindles and other precision machinery. Its design enables it to handle combined loads efficiently, providing stable operation under demanding conditions. The phenolic cage and optimized contact angle of 25° contribute to its superior high-speed capability and smooth performance.
71809 ACD/P4DGB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71809 | Basic bearing designation indicating size series and bore diameter (45 mm) |
| ACD | Angular Contact Design with 25° contact angle, optimized for high rigidity |
| P4 | High precision tolerance class for exceptional running accuracy |
| DGB | Universal Matchable (SU) arrangement - bearings can be paired in any combination |
71809 ACD/P4DGB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The angular contact design with 25° contact angle provides excellent resistance to combined radial and axial loads. The universal matching capability allows for flexible bearing arrangements that enhance system stiffness.
Precision Performance: Manufactured to P4 tolerance class with tight dimensional controls (bore: -0.004mm to 0, OD: -0.004mm to 0), ensuring minimal runout and vibration for precision applications.
High-Speed Capability: The phenolic cage and optimized internal geometry enable operation at limiting speeds up to 46,000 rpm, making it suitable for high-speed spindle applications.
Superior Material Quality: Constructed from chrome steel for both rings and balls, providing excellent wear resistance and durability under demanding operating conditions.
71809 ACD/P4DGB Bearing Typical Application Areas
- Machine Tool Spindles - High-precision machining centers and CNC equipment
- Precision Grinding Spindles - Applications requiring extreme rotational accuracy
- High-Speed Motors - Electric motors and generators operating at elevated speeds
- Medical Equipment - Dental handpieces and surgical tools
- Aerospace Components - Guidance systems and precision instrumentation
- Robotics - Precision joints and articulation points
