71924 CD/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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71924 CD/P4ADBB Bearing Product Overview & Core Advantages
The 71924 CD/P4ADBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement is preloaded to Light / Class B specifications, delivering superior system stiffness and minimizing axial and radial runout. Its primary advantage lies in its ability to handle combined loads (radial and axial) simultaneously with high precision, making it ideal for high-speed, high-rigidity spindles and other demanding machinery.
71924 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71924 | Basic bearing series and size designation. |
| C | Specifies a 15° contact angle, optimized for high-speed operation and moderate axial load capacity. |
| D | Indicates the bearing is part of a duplex (matched) set. |
| P4A | Denotes an ultra-high precision tolerance class, exceeding standard ABEC 7/ISO P4 levels, ensuring minimal runout and vibration. |
| DB | Specifies the Back-to-Back mounting arrangement, which provides high moment rigidity and excellent stability under complex loads. |
| B | Indicates the Light preload level applied to the matched set, reducing deflection and improving system responsiveness. |
71924 CD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide, stable support system that significantly increases moment stiffness, making it exceptionally resistant to tilting moments and complex load scenarios.
Superior Precision: Manufactured to P4A tolerance class with a bore and outside diameter tolerance of -0.004mm to 0, this bearing guarantees extremely precise shaft positioning and smooth, quiet operation essential for high-precision applications.
Optimized High-Speed Performance: The phenolic resin cage is lightweight and possesses excellent slip characteristics, contributing to lower friction, reduced heat generation, and stable operation at the high limiting speed of 10,000 rpm. The 15° contact angle further enhances high-speed capability.
High Load Capacity: With a dynamic load rating of 28,125 lbf and a static load rating of 41,175 lbf, this bearing set is engineered to handle significant combined radial and axial loads reliably.
71924 CD/P4ADBB Bearing Typical Application Areas
The 71924 CD/P4ADBB is the bearing of choice 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: Spindles for PCB drilling and routing.
- Medical Equipment: High-speed dental handpieces and surgical tools.
- Aerospace & Defense: Gyroscopes, radar systems, and other precision instrumentation.
