71808 ACD/P4DGC
71800 Series Super Precision Angular Contact Ball Bearings
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71808 ACD/P4DGC Bearing Product Overview & Core Advantages
The 71808 ACD/P4DGC is a precision angular contact ball bearing designed for demanding applications requiring high rotational accuracy and rigidity. As a universal matchable (SU) bearing supplied in a pre-lubricated, matched pair set, it excels at handling combined loads—simultaneously supporting significant radial loads and thrust loads in one direction. Its P4 tolerance class ensures exceptional dimensional and running accuracy, making it ideal for high-speed spindles and other precision machinery where high rigidity and operational reliability are paramount.
71808 ACD/P4DGC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71808 | Basic bearing series and size designation (40mm bore, 52mm OD, 14mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | The bearing has a Moderate preload (Class C) for enhanced stiffness. |
| P4 | Indicates a high-precision tolerance class for superior running accuracy. |
| DGC | Specifies the bearing is part of a Universal Matchable (SU) pair, ready for duplex mounting (DB, DF, DT). |
71808 ACD/P4DGC Bearing Structural Features & Performance Benefits
Optimized Internal Geometry: The 25° contact angle is engineered to efficiently handle high axial loads in one direction while supporting substantial radial loads, offering excellent performance for combined load conditions.
High Rigidity & Precision: Manufactured to P4 tolerance standards and featuring a Moderate preload, this bearing provides superior shaft positioning accuracy and system stiffness, minimizing deflection under load.
High-Speed Capability: The lightweight phenolic resin cage ensures stable operation and low friction, contributing to the high limiting speed of 56,000 rpm. The open design allows for efficient lubrication management in oil-mist or oil-jet systems.
Universal Matchability (SU): Supplied as a pre-ground matched set, these bearings can be universally arranged in back-to-back (DB), face-to-face (DF), or tandem (DT) configurations without further selection, simplifying installation and ensuring optimal preload and performance.
71808 ACD/P4DGC Bearing Typical Application Areas
The 71808 ACD/P4DGC is ideally suited for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Rotary Systems: High-frequency spindles and robotics.
- Industrial Pumps & Compressors: Where high-speed and accuracy are critical.
- Medical & Dental Equipment: High-speed handpieces and scanners.
