71807 ACD/P4DGB
71800 Series Super Precision Angular Contact Ball Bearings
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71807 ACD/P4DGB Bearing Product Overview & Core Advantages
The 71807 ACD/P4DGB is a metric precision angular contact ball bearing designed for applications demanding high rotational accuracy and rigidity. As a universally matchable (SU) bearing supplied in a preloaded pair (DB arrangement), it is engineered to accommodate combined radial and axial loads simultaneously. Its P4 tolerance class ensures exceptional running accuracy, making it ideal for high-speed spindles and other high-precision machinery. The phenolic cage and optimized contact angle of 25° contribute to its superior high-speed performance and operational stability.
71807 ACD/P4DGB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71807 | Basic bearing series and size designation (35mm bore, 47mm OD, 14mm width) |
| AC | Angular Contact design with a 25° contact angle |
| D | The bearing is part of a universally matchable (SU) pair |
| P4 | High Precision Tolerance Class (equivalent to ISO Class 4) |
| DGB | Indicates a Light Preload (Class B) applied to a Back-to-Back (DB) mounted pair |
71807 ACD/P4DGB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The angular contact design and universal matching capability allow two bearings to be paired in a back-to-back arrangement. This configuration provides high system rigidity and can support significant combined loads (radial and axial loads from both directions).
High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the 25° contact angle offers an optimal balance between axial load capacity and speed capability, enabling a high limiting speed of 56,000 rpm.
Precision & Accuracy: Manufactured to P4 tolerance class with tight dimensional control on the bore, outside diameter, and width. This ensures minimal runout and vibration, which is critical for precision applications.
Optimized for Matched Sets: As a universally matchable (SU) bearing, it can be universally paired with any other SU bearing of the same type without selective matching, simplifying inventory and assembly for preloaded arrangements.
71807 ACD/P4DGB Bearing Typical Application Areas
The 71807 ACD/P4DGB is ideally suited for high-performance applications requiring high speed, precision, and rigidity, including:
- Machine Tool Spindles (e.g., CNC milling, grinding, and turning centers)
- High-Frequency Spindles
- Precision Robotic Drives
- Medical and Dental Equipment (e.g., high-speed handpieces)
- Aerospace Actuation Systems
