71820 ACDGB/P4
71800 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71820 ACDGB/P4 Bearing Product Overview & Core Advantages
The 71820 ACDGB/P4 is a single-row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and rigidity. Manufactured to P4 tolerance class, this bearing delivers superior dimensional stability and running accuracy. Its 25° contact angle provides excellent capacity for combined radial and axial loads in one direction. The phenolic cage and universal matching capability make it ideal for high-speed spindle arrangements where preload control and thermal stability are critical.
71820 ACDGB/P4 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71820 | Basic bearing designation with 100mm bore, 125mm OD |
| AC | Angular Contact design with 25° contact angle |
| DGB | Universal Matchable bearing for precise preload arrangements |
| P4 | High-precision tolerance class for superior running accuracy |
71820 ACDGB/P4 Bearing Structural Features & Performance Benefits
High-Speed Performance: The phenolic resin cage provides excellent strength-to-weight ratio and reduced friction, enabling operation at limiting speeds of 15,000 rpm. The optimized cage design minimizes centrifugal forces and ensures stable operation at high rotational speeds.
Precision Engineering: Manufactured to P4 tolerance standards with bore and outside diameter tolerances of -0.004mm to 0, ensuring precise fit and minimal runout. The 25° contact angle delivers optimal load distribution for both radial and axial forces.
Universal Matching Capability: Designed as Universal Matchable (SU) bearings, allowing for precise preload control when mounted in pairs. This feature enables customized stiffness and thermal performance in spindle applications.
Material Excellence: Constructed from chrome steel for both rings and balls, providing high hardness, wear resistance, and dimensional stability across the operating temperature range of -30°C to 110°C.
71820 ACDGB/P4 Bearing Typical Application Areas
- Machine Tool Spindles: High-precision milling, grinding, and turning centers requiring P4 accuracy
- High-Speed Machining Centers: Applications demanding 15,000 rpm operational speeds
- Precision Instrumentation: Measuring equipment and laboratory instruments
- Robotic Systems: High-accuracy robotic arms and positioning systems
- Medical Equipment: Surgical tools and diagnostic imaging systems
- Aerospace Components: Guidance systems and flight control mechanisms
