71924 ACD/P4ALTBTA
71900 Series Super Precision Angular Contact Ball Bearings
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71924 ACD/P4ALTBTA Bearing Product Overview & Core Advantages
The 71924 ACD/P4ALTBTA is a precision angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. This bearing is supplied as a triplex back-to-back (TBT) matched set, delivering superior performance in handling combined loads (radial and axial). Its P4A tolerance class ensures ultra-precision operation, making it ideal for high-speed spindles and other critical machinery where maximum stiffness and running accuracy are paramount.
71924 ACD/P4ALTBTA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71924 | Basic bearing series and size designation | Indicates a high-precision, light series bearing with a 120mm bore. |
| ACD | 25° Contact Angle | Optimized for carrying high axial loads in one direction. |
| P4A | Tolerance Class | Denotes ultra-precision dimensional and running accuracy, superior to ABEC 7. |
| LT | Light Preload | Preload class A (Extra Light) minimizes friction and heat generation, ideal for high-speed applications. |
| BTA | Back-to-Back Triplex Arrangement | Three bearings are factory-matched and mounted back-to-back, providing maximum rigidity and moment load capacity. |
71924 ACD/P4ALTBTA Bearing Structural Features & Performance Benefits
Unmatched Rigidity and Load Capacity: The triplex back-to-back (TBT) arrangement creates an exceptionally rigid bearing system capable of withstanding heavy combined loads and significant moment loads. This configuration is critical for maintaining precision under demanding operating conditions.
High-Speed Capability: The combination of a phenolic cage, light preload (A), and open design allows for a high limiting speed of 16,250 rpm. The phenolic cage offers low weight and excellent performance at high rotational speeds.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control on the bore, outside diameter, and width. This ensures minimal runout and vibration, which is essential for applications requiring extreme rotational accuracy.
Superior Material Construction: Made from chrome steel for both rings and balls, providing high fatigue life and durability. The bearing is pre-lubricated for immediate operation upon installation.
71924 ACD/P4ALTBTA Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers where precision and rigidity are non-negotiable.
- Precision Instrumentation: High-accuracy measuring devices and scientific equipment.
- High-Frequency Motors and Spindles: Applications requiring stable operation at very high rotational speeds.
- Aerospace and Defense Systems: Gyroscopes, radar systems, and other critical rotational mechanisms.
