71804 ACD/P4DBC
71800 Series Super Precision Angular Contact Ball Bearings
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71804 ACD/P4DBC Bearing Product Overview & Core Advantages
The 71804 ACD/P4DBC is a super-precision angular contact ball bearing designed for the most demanding applications. This duplex back-to-back (DB) pair is preloaded for high rigidity and exceptional running accuracy. Its primary advantage lies in its ability to handle combined loads—significant radial and axial loads in both directions—simultaneously, making it ideal for high-speed spindles and precision machinery where stability and minimal deflection are critical. The matched set ensures optimal performance and simplifies installation.
71804 ACD/P4DBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71804 | Basic bearing series and size designation (20mm bore, 32mm OD). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex (Two bearings supplied as a matched set). |
| P4 | Indicates a high-precision tolerance class (superior to ABEC 7). |
| DB | Back-to-Back mounting arrangement for high moment stiffness. |
| C | Specifies a moderate preload (Class C). |
71804 ACD/P4DBC Bearing Structural Features & Performance Benefits
High Rigidity and Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, ensuring exceptional operational stability.
Superior Load Capacity: With a 25° contact angle and a dynamic load rating of 1332 lbf, this bearing is engineered to sustain high combined radial and axial loads from both directions.
Optimized High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and contributes to the high limiting speed of 121,000 rpm. The open design and factory lubrication are optimized for these conditions.
Precision Engineering: Manufactured to P4 tolerance class with tight dimensional control on the bore, outside diameter, and width, this bearing guarantees low vibration and high rotational accuracy.
71804 ACD/P4DBC Bearing Typical Application Areas
The 71804 ACD/P4DBC is specified for high-performance applications where precision and speed are non-negotiable. Key industries and equipment include:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Robotic Drives
- Advanced Medical and Dental Equipment
- Aerospace Instrumentation and Actuators
