71924 CDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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71924 CDGA/P4A Bearing Product Overview & Core Advantages
The 71924 CDGA/P4A is a single row angular contact ball bearing engineered for applications demanding ultra-high precision and exceptional running accuracy. Manufactured to the stringent P4A tolerance class, this bearing is designed to handle significant axial loads in one direction while supporting combined radial and axial loads. Its extra light preload (Class A) minimizes deflection under operational stresses, making it ideal for high-speed spindles and other precision machinery where rigidity and minimal runout are critical. The bearing is universally matchable (SU), allowing for precise axial play adjustment when mounted with other bearings.
71924 CDGA/P4A 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, 22mm width. |
| C | 15° Contact Angle. | Optimized for high-speed operation and moderate axial load capacity. |
| DG | Universal Matchable bearing. | Permits flexible mounting arrangements (face-to-face, back-to-back) to achieve desired preload or clearance. |
| A | Extra Light Preload (Class A). | Enhances rigidity and rotational accuracy by minimizing internal clearance. |
| P4A | Tolerance Class exceeding ABEC 7/ISO P4. | Guarantees extremely tight dimensional and running accuracy for the most demanding precision applications. |
71924 CDGA/P4A Bearing Structural Features & Performance Benefits
High Precision & Rigidity: The P4A tolerance class and Class A preload work in tandem to deliver exceptional rotational accuracy and system stiffness. This is critical for applications like machine tool spindles to achieve superior surface finishes and dimensional tolerances.
Optimized Load Capacity: With a 15° contact angle and a radial dynamic load rating of 17,550 lbf, this bearing is adept at handling combined loads, particularly thrust loads in one direction. The phenolic cage ensures stable operation under these loads.
Superior High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the optimized internal geometry and 14.288 mm ball diameter contribute to a high limiting speed of 10,000 rpm. This makes it a premier choice for high-speed bearings.
Material Integrity: Constructed from high-grade chrome steel for both rings and balls, the bearing offers excellent wear resistance and durability, ensuring a long service life even in demanding conditions.
71924 CDGA/P4A Bearing Typical Application Areas
The 71924 CDGA/P4A is specified for high-performance machinery where precision and speed are non-negotiable. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications requiring the utmost in running accuracy.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM electric motors.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other critical instrumentation.
- Medical Equipment: High-speed dental handpieces and imaging device rotors.
