71804 ACDGA/HCP4
Hybrid Ceramic Super Precision Bearings
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71804 ACDGA/HCP4 Bearing Product Overview & Core Advantages
The 71804 ACDGA/HCP4 is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. Engineered with a 25° contact angle and manufactured to P4 tolerance class, this bearing delivers superior running accuracy and dimensional stability. Its core advantages include the ability to handle combined loads (simultaneous radial and axial loads), high-speed capability enabled by a phenolic cage and ceramic balls, and high rigidity for precise shaft positioning. The extra light preload (Class A) ensures minimal deflection under light loads, making it ideal for high-precision, high-reliability systems.
71804 ACDGA/HCP4 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71804 | Basic bearing series, indicating a metric, extra-light cross-section angular contact bearing. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex arrangement (two bearings are universally matchable). |
| GA | Indicates a specific preload group: Extra Light (Class A). |
| /HC | Hybrid Ceramic: Signifies the use of ceramic balls (typically Silicon Nitride, Si3N4). |
| P4 | The bearing is manufactured to P4 tolerance class, denoting very high precision. |
71804 ACDGA/HCP4 Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The use of ceramic balls with a chrome steel ring significantly reduces friction, heat generation, and wear. This construction enables higher limiting speeds (121,000 rpm), provides electrical insulation, and offers superior performance in lubricant-starved conditions.
Phenolic Cage: The lightweight and robust phenolic resin cage contributes to lower centrifugal forces, reduced vibration, and smooth operation at very high speeds.
High Rigidity & Precision: The angular contact design and P4 precision grade provide high system rigidity and exceptional running accuracy, which is critical for applications with minimal runout tolerance.
Universal Matching (SU): This bearing is "Universal Matchable," meaning individual bearings can be paired in any combination (face-to-face, back-to-back, or tandem) to achieve the desired preload and stiffness without selective mounting.
71804 ACDGA/HCP4 Bearing Typical Application Areas
The 71804 ACDGA/HCP4 is ideally suited for high-performance machinery where precision, speed, and reliability are paramount. Key application areas include:
- High-Speed Machine Tool Spindles
- Precision Grinding Spindles
- High-Frequency Electric Motors
- Aerospace & Defense Systems (e.g., gyroscopes, avionics)
- Semiconductor Manufacturing Equipment
- Medical & Dental Handpieces
