71804 ACD/P4DGB
71800 Series Super Precision Angular Contact Ball Bearings
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71804 ACD/P4DGB Bearing Product Overview & Core Advantages
The 71804 ACD/P4DGB is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a universally matchable (SU) bearing supplied in a pre-loaded duplex set, it delivers superior rigidity and can accommodate combined radial and axial loads simultaneously. Manufactured to P4 tolerance class with a phenolic resin cage, it is the ideal solution for high-precision spindles and other machinery requiring high reliability and dimensional stability.
71804 ACD/P4DGB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71804 | Basic bearing series and size designation | Indicates a 20mm bore, 32mm OD, 14mm width bearing from the 718 series. |
| AC | 25° Contact Angle | Optimized for high axial load capacity and high-speed operation. |
| D | Duplex Bearing Set | Two bearings are supplied as a matched pair. |
| P4 | Tolerance Class | Denotes high-precision manufacturing with extremely tight dimensional and running accuracy tolerances. |
| DGB | Universal Matchable (SU) & Light Preload (Class B) | Bearings are universally matchable for flexible mounting configurations (back-to-back, face-to-face, tandem) and come with a light preload to eliminate internal clearance, enhancing system rigidity. |
71804 ACD/P4DGB Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The duplex set (D) configuration and 25° contact angle create a highly rigid bearing system capable of supporting significant combined loads. The light preload (Class B) ensures there is no internal play, which is critical for precise positioning and vibration damping.
Superior High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and allows for a high limiting speed of 121,000 rpm. The open design facilitates efficient lubrication and cooling.
Precision Engineering: Manufactured to ABEC 7 / P4 tolerance class, this bearing guarantees exceptional running accuracy, low noise, and consistent performance, which is essential for precision machinery.
Universal Matching Capability (SU): The universally matchable design provides maximum flexibility for mounting in any duplex arrangement (DB, DF, DT) to best suit the specific load and stiffness requirements of the application.
71804 ACD/P4DGB Bearing Typical Application Areas
The 71804 ACD/P4DGB is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Medical and Dental Equipment: High-speed handpieces and scanners.
- Aerospace and Defense: Gyroscopes, radar systems, and navigation instruments.
- High-Frequency Motors and Spindles: Where minimal runout and high rotational accuracy are required.
