71818 ACDGB/P4
71800 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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71818 ACDGB/P4 Bearing Product Overview & Core Advantages
The 71818 ACDGB/P4 is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a single bearing with Universal Matchable (SU) designation, it can be precisely paired with another identical bearing to form a preloaded duplex set, delivering superior performance under combined loads. Its P4 tolerance class ensures minimal runout and vibration, making it ideal for high-speed operation and high-reliability scenarios. The light preload (Class B) minimizes deflection under operational stresses, enhancing system stability and lifespan.
71818 ACDGB/P4 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71818 | Basic bearing series and size designation (90mm bore, 115mm OD, 13mm width). |
| AC | Angular Contact design, optimized for combined radial and axial loads. |
| D | High Contact Angle (25°), providing superior axial load capacity. |
| GB | Universal Matchable bearing. Can be paired in any combination (DB, DF, DT) to achieve specific preload and stiffness characteristics. |
| /P4 | Precision Tolerance Class. Defines extremely tight dimensional and running accuracy tolerances for high-precision applications. |
71818 ACDGB/P4 Bearing Structural Features & Performance Benefits
Optimized Internal Geometry: The 25° contact angle is engineered to support significant axial loads in one direction while effectively handling radial loads. This makes the bearing exceptionally suited for applications with demanding combined load conditions.
High-Speed Phenolic Cage: The phenolic resin cage is lightweight and possesses excellent sliding properties, reducing friction and centrifugal forces. This contributes directly to the bearing's high limiting speed of 15,000 rpm, ensuring stable operation at high velocities.
Superior Material & Precision: Manufactured from high-grade chrome steel for both rings and balls, the bearing offers high fatigue life and wear resistance. The P4 tolerance class guarantees precise bearing dimensions and geometry, resulting in low noise, low vibration, and enhanced positional accuracy of the entire assembly.
Pre-Lubricated & Open Design: The bearing comes lubricated from the factory, ready for immediate use. The open seal type allows for optimal lubrication flow and heat dissipation in controlled environments, and facilitates custom re-lubrication schemes if required by the application.
71818 ACDGB/P4 Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning spindles where precision, rigidity, and speed are critical.
- Precision Gearboxes: Applications requiring accurate shaft positioning and high rotational accuracy.
- High-Frequency Motors and Spindles: Used in motors for CNC machinery, robotics, and other automated systems.
- Medical and Laboratory Equipment: Centrifuges, scanners, and other devices demanding quiet, reliable, and precise rotation.
- Aerospace Actuation Systems: Control surface actuators and other mechanisms where reliability and performance under load are paramount.
