71924 ACD/PA9ADBC
71900 Series Super Precision Angular Contact Ball Bearings
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71924 ACD/PA9ADBC Bearing Product Overview & Core Advantages
The 71924 ACD/PA9ADBC is a precision duplex angular contact ball bearing configured in a back-to-back (DB) arrangement. This matched pair is designed to handle combined loads, providing exceptional support for significant radial loads and bidirectional axial loads simultaneously. Its defining characteristics include a moderate preload (Class C) for enhanced system rigidity, a PA9A ultra-precision tolerance class ensuring minimal runout, and a phenolic cage optimized for high-speed performance. This makes it an ideal solution for high-precision, high-reliability applications demanding maximum rotational accuracy and stiffness.
71924 ACD/PA9ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71924 | Basic bearing series and size designation. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex (Two bearings as a set). |
| DB | Back-to-Back arrangement for high moment rigidity. |
| PA9A | Ultra-precision tolerance class for superior running accuracy. |
| DBC | Indicates a specific preload level (Moderate / Class C). |
71924 ACD/PA9ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & System Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists overturning moments, making it exceptionally stable under complex loading conditions.
- Superior Load Capacity: Engineered with a 25° contact angle and high-quality chrome steel components, this bearing set offers a high radial dynamic load rating of 26,775 lbf and a static load rating of 38,925 lbf, reliably handling demanding combined loads.
- Optimized High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces and ensures smooth operation, contributing to a high limiting speed of 10,000 rpm. The pre-applied lubrication is suitable for the specified operating temperature range.
- Precision Engineering: Manufactured to PA9A tolerance class with tight dimensional control on the bore, outside diameter, and width, this bearing guarantees exceptional running accuracy and consistent performance in precision machinery.
71924 ACD/PA9ADBC Bearing Typical Application Areas
- Machine Tool Spindles (e.g., milling, grinding)
- Precision Gearboxes
- High-Frequency Motors
- Industrial Pumps and Compressors
- Medical and Laboratory Equipment
