71821 CD/P4DGA
71800 Series Super Precision Angular Contact Ball Bearings
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71821 CD/P4DGA Bearing Product Overview & Core Advantages
The 71821 CD/P4DGA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. Manufactured to P4 tolerance class, this bearing excels in providing superior running accuracy and dimensional stability. Its universal matchable (SU) design allows two bearings to be paired in a back-to-back (DB) or face-to-face (DF) arrangement with a pre-determined axial clearance, simplifying installation and ensuring optimal performance. The combination of a phenolic cage and a 15° contact angle enables high-speed operation while effectively supporting combined loads.
71821 CD/P4DGA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Advantage |
|---|---|---|
| CD | High precision, 15° contact angle, universal matchable design | Optimized for high-speed applications and simplified bearing pairing. |
| P4 | Tolerance class equivalent to ABEC 7 / ISO P4 | Ensures extremely tight dimensional and running accuracy for precision machinery. |
| DGA | Preloaded with Extra Light (Class A) preload, universal matchable | Provides high rigidity and precise shaft positioning without requiring adjustment during mounting. |
71821 CD/P4DGA Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to P4 tolerance class with a universal matchable (SU) design, this bearing delivers exceptional dimensional stability and running accuracy, which is critical for minimizing vibration and ensuring precise shaft rotation.
- Superior High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, while the optimized 15° contact angle minimizes heat generation, together enabling a high limiting speed of 16,000 rpm.
- Optimized Load Capacity: The bearing is engineered to handle significant combined radial and axial loads simultaneously, with a dynamic load rating of 8348 lbf and a static load rating of 13500 lbf.
- Universal Matching & Preload: The extra light preload (Class A) is built into the universal matchable design. This eliminates complex setup procedures, ensures immediate high system rigidity upon installation, and provides consistent performance in paired arrangements.
71821 CD/P4DGA Bearing Typical Application Areas
The 71821 CD/P4DGA is ideally suited for high-precision, high-speed rotational systems, including:
- Machine Tool Spindles: For CNC machining centers, grinding spindles, and other precision metalworking equipment.
- High-Frequency Motors and Spindles: Applications requiring minimal runout and high rotational accuracy.
- Precision Instrumentation: Used in measuring devices, optical scanners, and laboratory equipment.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other critical components demanding reliability and precision.
