71924 ACD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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71924 ACD/P4ADBA Bearing Product Overview & Core Advantages
The 71924 ACD/P4ADBA is a super-precision angular contact ball bearing designed for demanding industrial applications requiring exceptional rotational accuracy and rigidity. As part of a matched duplex pair in a back-to-back (DB) arrangement, this bearing is engineered to accommodate combined loads—simultaneously handling substantial radial loads and axial loads from both directions. Its P4A tolerance class and extra light preload (Class A) ensure smooth, precise operation with minimal runout, making it ideal for high-speed spindles and other high-precision machinery.
71924 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71924 | Basic bearing series and size designation | Defines the core dimensions: 120mm bore, 165mm OD, 44mm width. |
| ACD | Angular Contact, Duplex arrangement | Specifies the bearing type and that it is supplied as one half of a pre-matched set. |
| P4A | Tolerance Class | Indicates ultra-precision dimensional and running accuracy, superior to ABEC 7/ISO P4. |
| DB | Back-to-Back | Specifies the mounting arrangement of the matched pair, providing high moment stiffness. |
71924 ACD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity and Moment Load Capacity: The duplex back-to-back (DB) configuration creates a wide, stable support system that significantly increases resistance to moment loads and enhances overall system stiffness. This is critical for applications where shaft deflection must be minimized.
Optimized for High-Speed Operation: The phenolic resin cage is lightweight and possesses excellent sliding properties, reducing centrifugal forces and friction at high rotational speeds. This contributes to the bearing's high limiting speed of 16,250 rpm.
Superior Load Ratings: With a 25° contact angle and high-quality chrome steel components, this bearing delivers a high dynamic load rating of 26,775 lbf and a static load rating of 38,925 lbf, ensuring long service life under demanding combined radial and axial loads.
Pre-Configured for Precision: The extra light preload (Class A) is applied at the factory, eliminating the need for complex on-site adjustment and ensuring immediate, optimal performance with low heat generation.
71924 ACD/P4ADBA Bearing Typical Application Areas
The 71924 ACD/P4ADBA is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Internal and external grinding machines.
- High-Frequency Motors and Spindles: Applications requiring extreme rotational accuracy.
- Industrial Pumps and Compressors: For robust performance under combined loads.
- Aerospace and Defense Positioning Systems: Gyroscopes and other critical guidance components.
