71821 CDGB/P4
71800 Series Super Precision Angular Contact Ball Bearings
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71821 CDGB/P4 Bearing Product Overview & Core Advantages
The 71821 CDGB/P4 is a single-row angular contact ball bearing engineered for applications demanding high precision and superior running accuracy. Operating under the stringent P4 tolerance class, this bearing is designed to handle significant axial loads in one direction, making it ideal for high-speed spindles and precision machinery. Its universal matchable (SU) design allows for flexible mounting in various preload configurations, ensuring optimal system rigidity and performance. The combination of a phenolic cage and a 15° contact angle contributes to its exceptional high-speed capabilities and smooth operation.
71821 CDGB/P4 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Interpretation |
|---|---|
| 71821 | Basic bearing designation, indicating the specific size series and bore diameter (105 mm). |
| C | Signifies a 15° contact angle, optimized for high-speed applications requiring high axial load capacity. |
| DGB | Indicates a Universal Matchable (SU) bearing. This design allows two bearings to be mounted in a "back-to-back" (DB), "face-to-face" (DF), or "tandem" (DT) arrangement to accommodate combined loads. |
| P4 | Denotes the tolerance class, corresponding to ISO Class 4. This signifies extremely tight dimensional and running accuracy tolerances for superior performance in precision applications. |
71821 CDGB/P4 Bearing Structural Features & Performance Benefits
High Precision & Rigidity: Manufactured to P4 tolerance class standards, this bearing ensures minimal runout and vibration, providing the high rigidity required for precise positioning and smooth operation in machine tool spindles.
Optimized High-Speed Performance: The phenolic resin cage is lightweight and possesses excellent sliding properties, reducing centrifugal forces and friction at high rotational speeds (up to 16,000 rpm). The 15° contact angle is ideally suited for high-speed applications.
Superior Load Capacity: The bearing's internal geometry and high-grade chrome steel construction provide a high dynamic load rating of 5152 lbf and static load rating of 6750 lbf, enabling it to handle significant radial and one-direction axial loads.
Universal Matching Capability: The Universal Matchable (SU) feature allows for preloaded bearing sets, which increases system stiffness, minimizes axial and radial play, and extends bearing service life.
71821 CDGB/P4 Bearing Typical Application Areas
The 71821 CDGB/P4 is ideally suited for high-precision, high-speed applications across various industries, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and spindle drives requiring high accuracy and rigidity.
- Aerospace & Defense: Gyroscopes, radar systems, and other precision instruments.
- High-Frequency Motors and Spindles: Where minimal vibration and high rotational accuracy are critical.
