71820 ACD/P4DGB
71800 Series Super Precision Angular Contact Ball Bearings
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71820 ACD/P4DGB Bearing Product Overview & Core Advantages
The 71820 ACD/P4DGB is a super-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As a universal matchable (SU) bearing supplied in a pre-set duplex pair, it excels at handling combined loads (radial and axial) simultaneously. Its P4 tolerance class and light preload (Class B) ensure smooth, high-speed operation with minimal runout, making it ideal for high-precision spindles and other critical machinery where reliability is paramount.
71820 ACD/P4DGB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Performance Implication |
|---|---|---|
| ACD | 25° Contact Angle, Duplex Arrangement | Optimized for high axial load capacity and rigid support. |
| P4 | Tolerance Class P4 (ABEC 7) | Guarantees extremely tight dimensional and running accuracy for high-precision applications. |
| DGB | Universal Matchable (SU), Light Preload (Class B) | Bearings are supplied as a pre-mounted pair, ready for installation, ensuring optimal stiffness and simplifying assembly. |
71820 ACD/P4DGB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex pair arrangement creates a highly rigid system capable of supporting significant combined radial and axial loads from both directions. The 25° contact angle is specifically engineered for high axial load carrying capability.
- Super-Precision Performance: Manufactured to P4 tolerance class, this bearing ensures minimal vibration and superior running accuracy, which is critical for applications like machine tool spindles.
- High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, while the open design and optimized internal geometry contribute to a high limiting speed of 15,000 rpm, enabling efficient high-speed operation.
- Optimized for Precision Mounting: The universal matchable (SU) design allows any two bearings to be paired without selective matching, simplifying procurement and inventory. The light preload eliminates internal clearance, enhancing system stiffness from startup.
71820 ACD/P4DGB Bearing Typical Application Areas
This high-precision bearing is ideally suited for applications where accuracy, speed, and rigidity are non-negotiable. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: Measuring and testing equipment.
- High-Frequency Motors & Spindles: PCB drilling spindles and other electric motor applications.
- Robotics: High-accuracy joints and rotary actuators.
