71924 CDGB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71924 CDGB/P4A Bearing Product Overview & Core Advantages
The 71924 CDGB/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a single bearing that is Universal Matchable (SU), it can be precisely paired with a second identical bearing to form a preloaded duplex set, offering superior system rigidity. Its defining characteristics include a P4A tolerance class for ultra-precise running accuracy, a 15° contact angle optimized for handling combined radial and axial loads, and a light preload (Class B) that minimizes deflection under operational stresses. This bearing is pre-lubricated and features an open seal type, making it ideal for high-speed spindles and other precision machinery where controlled lubrication is used.
71924 CDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71924 | Basic bearing series and size designation. | Identifies the bearing's metric dimensions: 120mm bore, 165mm OD, 22mm width. |
| C | 15° nominal contact angle. | Optimized for high-speed operation and moderate axial load capacity. |
| DGB | Universal Matchable bearing for Duplex arrangements (Back-to-Back). | Allows for precise pairing with another SU bearing to create a preloaded set, significantly increasing system rigidity and moment load capacity. |
| P4A | Super-precision tolerance class. | Defines extremely tight tolerances on bore, outside diameter, and width for superior running accuracy and minimal vibration. |
71924 CDGB/P4A Bearing Structural Features & Performance Benefits
High-Precision Construction: Manufactured to P4A tolerance class with bore and outside diameter tolerances of -0.004mm to 0, this bearing ensures exceptional dimensional stability and concentricity, which is critical for minimizing runout in high-speed applications.
Optimized Load Capacity: The 15° contact angle and robust chrome steel construction enable the bearing to efficiently support combined radial and axial loads. With a dynamic load rating of 17,550 lbf and a static load rating of 20,588 lbf, it offers reliable performance under demanding conditions.
High-Speed Capability: The lightweight phenolic cage reduces centrifugal forces and allows for a high limiting speed of 10,000 rpm. The open design facilitates efficient lubrication and heat dissipation, which is essential for maintaining performance at high rotational speeds.
Universal Matching (SU): The DGB suffix indicates that this is a universal matchable bearing. When two such bearings are mounted in a back-to-back (DB) arrangement, they create a rigid bearing system capable of withstanding moment loads and providing precise shaft positioning.
71924 CDGB/P4A Bearing Typical Application Areas
The 71924 CDGB/P4A is engineered for high-performance applications where speed, precision, and rigidity are paramount. Key industries and machinery include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and rotary actuators requiring high positional accuracy.
- Aerospace & Defense: Gyroscopes, radar systems, and auxiliary power units (APUs).
- High-Frequency Motors and Spindles: Applications demanding minimal vibration and high rotational accuracy.
