S71909 ACDGB/P4A
Sealed Super Precision Angular Contact Ball Bearings
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S71909 ACDGB/P4A Bearing Product Overview & Core Advantages
The S71909 ACDGB/P4A is a metric, single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and rigidity. Operating under P4A tolerance class, it delivers superior running accuracy. Its defining characteristic is the 25° contact angle, optimized to support significant combined loads—handling both radial and axial forces simultaneously. The bearing features a phenolic cage and comes pre-lubricated with grease, making it suitable for high-speed operation up to 41,000 rpm. Its compact design, with a 45 mm bore and 12 mm width, offers a high-performance solution for space-constrained, precision machinery.
S71909 ACDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning | Performance Implication |
|---|---|---|
| S7 | Series designation for high-precision angular contact bearings | Denotes a bearing family designed for superior accuracy and performance. |
| 1909 | Bore Diameter: 45 mm, Outside Diameter: 68 mm, Width: 12 mm | Defines the critical bearing dimensions for fit and assembly. |
| AC | Angular Contact design with a 25° contact angle | Optimized for handling combined radial and axial loads. |
| DGB | Universal Matchable (SU) bearing in a set of 4, Light Preload (Class B) | Ensures bearings can be mounted in tandem for increased rigidity and are pre-loaded to minimize deflection. |
| P4A | High-Precision Tolerance Class | Guarantees extremely tight dimensional and running accuracy for precision applications. |
S71909 ACDGB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The single-row angular contact design with a 25° contact angle provides excellent resistance to deflection under combined loads. With a dynamic load rating of 2790 lbf and a static load rating of 2025 lbf, it offers reliable performance in demanding conditions.
- Superior High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the optimized internal geometry and grease lubrication work in concert to enable a high limiting speed of 41,000 rpm.
- Precision Engineering: Manufactured to P4A tolerance class with tight bore, outside diameter, and width tolerances, this bearing ensures minimal runout and vibration, which is critical for high-precision spindles.
- Matched Set Versatility: As a Universal Matchable (SU) bearing, it can be universally paired with other bearings from the same set (of 4) in various configurations (back-to-back, face-to-face, or tandem) to achieve specific stiffness and load-handling requirements.
S71909 ACDGB/P4A Bearing Typical Application Areas
The S71909 ACDGB/P4A is ideally suited for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: Measuring devices and laboratory equipment.
- High-Frequency Motors and Spindles: Applications requiring rapid acceleration and deceleration.
- Robotics: Articulated arms and precision joints.
