71820 CD/P4
71800 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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71820 CD/P4 Bearing Product Overview & Core Advantages
The 71820 CD/P4 is a high-precision single row angular contact ball bearing engineered for applications demanding exceptional rotational accuracy and rigidity. This precision bearing features a P4 (ABEC-7) tolerance class, ensuring minimal runout and superior performance in high-speed spindles and precision machinery. Its 15° contact angle is optimized to handle significant combined loads, efficiently supporting both radial and axial forces. The phenolic resin cage and prelubrication contribute to its high-speed capability and reliable operation, making it an ideal choice for machine tools and other high-performance industrial equipment.
71820 CD/P4 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71820 | Basic bearing designation, indicating a single row angular contact ball bearing with a 100 mm bore and 125 mm outside diameter. |
| CD | Indicates a specific internal design with a 15° contact angle and optimized internal geometry for high rigidity and precise operation. |
| P4 | Denotes the tolerance class, equivalent to ABEC-7. This signifies extremely tight dimensional and running accuracy tolerances for high-precision applications. |
71820 CD/P4 Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The single row design with a 15° contact angle provides excellent rigidity and precise shaft positioning, critical for applications like machine tool spindles. The P4 tolerance class ensures minimal vibration and noise.
- Superior Load Capacity: Engineered to handle combined loads effectively, with a radial dynamic load rating of 5062 lbf and a radial static load rating of 6525 lbf.
- Optimized High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, allowing for a high limiting speed of 14,000 rpm. The bearing is prelubricated for immediate operation and sustained performance at high velocities.
- Durable Material Construction: Manufactured from chrome steel for both rings and balls, providing high fatigue resistance and long service life under demanding conditions.
71820 CD/P4 Bearing Typical Application Areas
- Machine Tool Spindles (High-speed machining centers, grinding spindles)
- Precision Grinding Equipment
- High-Frequency Motors
- Medical and Dental Equipment Spindles
- Aerospace Instrumentation
