71820 ACD/P4DGC
71800 Series Super Precision Angular Contact Ball Bearings
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71820 ACD/P4DGC Bearing Product Overview & Core Advantages
The 71820 ACD/P4DGC is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This universally matchable (SU) bearing features a 25° contact angle and moderate preload (Class C), enabling it to handle combined radial and axial loads simultaneously. Manufactured to P4 tolerance class, it delivers superior running accuracy and is ideally suited for high-speed spindles and precision machinery where reliability and performance are critical.
71820 ACD/P4DGC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71820 | Basic bearing designation indicating bore diameter (100 mm), outside diameter (125 mm), and width (26 mm) |
| AC | Angular Contact design with 25° contact angle |
| D | High internal clearance optimized for thermal expansion in high-speed applications |
| P4 | Precision tolerance class ensuring superior dimensional and running accuracy |
| DGC | Universal matchable (SU arrangement) allowing flexible pairing for preload optimization |
71820 ACD/P4DGC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The optimized 25° contact angle and moderate preload configuration provide exceptional stiffness, enabling the bearing to withstand significant combined loads while maintaining precise shaft positioning.
Precision Engineering: Manufactured to P4 tolerance standards with tight dimensional control (bore and OD tolerance: -0.004mm to 0), ensuring minimal runout and vibration for superior operational accuracy.
High-Speed Capability: The phenolic cage and optimized internal geometry contribute to stable operation at limiting speeds up to 15,000 rpm, making it suitable for demanding spindle applications.
Universal Matching Design: As a universally matchable (SU) bearing, it can be paired in any combination to achieve specific preload requirements without selective matching, simplifying installation and inventory management.
71820 ACD/P4DGC Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and precision lathes
- Precision Instrumentation: Measuring equipment, optical systems, and laboratory apparatus
- High-Speed Motors: Servo motors, spindle motors, and high-frequency drives
- Aerospace Components: Gyroscopes, navigation systems, and auxiliary power units
- Medical Equipment: Dental handpieces, surgical tools, and diagnostic imaging systems
