71804 CD/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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71804 CD/P4 Bearing Product Overview & Core Advantages
The 71804 CD/P4 is a single-row angular contact ball bearing designed for applications requiring high precision and superior performance under combined loads. Engineered to P4 (ABEC-7) tolerance class, it offers exceptional running accuracy. Its key advantage lies in its ability to accommodate significant axial loads in one direction in addition to radial loads, making it ideal for high-speed spindles and precision machinery where rigidity and minimal runout are critical. The phenolic cage and optimized internal geometry contribute to its high-speed capabilities and smooth operation.
71804 CD/P4 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71804 | Basic bearing designation, indicating a metric, single-row angular contact ball bearing with a 20mm bore, 32mm OD, and 7mm width. |
| C | Specifies a 15° contact angle, optimized for high-speed applications requiring high axial load capacity. |
| D | Indicates the bearing is part of a matched set (Duplex) for preloaded arrangements, though supplied as a single unit here. |
| P4 | Denotes a high precision tolerance class (equivalent to ABEC-7), ensuring minimal dimensional variation and superior running accuracy. |
71804 CD/P4 Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The angular contact design with a 15° contact angle provides high rigidity and enables the bearing to support combined radial and axial loads efficiently. The optimized raceway and ball geometry maximize load distribution.
- High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, minimizes friction, and allows for a high limiting speed of 70,000 rpm. This makes it suitable for demanding high-speed applications.
- Precision Engineering: Manufactured to P4 tolerance class, this bearing ensures extremely tight dimensional control (bore: -0.005mm to 0, OD: -0.006mm to 0), resulting in low vibration, minimal noise, and precise shaft positioning.
- Material Quality: Constructed from chrome steel for both rings and balls, the bearing offers high hardness, wear resistance, and long service life under demanding operating conditions.
71804 CD/P4 Bearing Typical Application Areas
The 71804 CD/P4 is ideally suited for high-precision, high-speed machinery and systems, including:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Dental and Medical Handpieces
- Aerospace Control Systems
- Robotic Arm Joints and Drives
