71821 CDGC/P4
71800 Series Super Precision Angular Contact Ball Bearings
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71821 CDGC/P4 Bearing Product Overview & Core Advantages
The 71821 CDGC/P4 is a single row angular contact ball bearing engineered for applications demanding high precision and superior running accuracy. Operating under a Moderate (Class C) preload, this bearing is designed to primarily accommodate high axial loads in one direction while also handling significant radial loads. Its P4 tolerance class ensures exceptional dimensional and running accuracy, making it ideal for high-speed spindles and other precision machinery. The bearing is Universal Matchable (SU), allowing for precise axial play adjustment when mounted in pairs or sets, and comes pre-lubricated for immediate service.
71821 CDGC/P4 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71821 | Basic bearing series and size designation | Defines the core dimensions: 105mm bore, 130mm OD, 13mm width. |
| CD | Contact angle of 15° and Moderate preload (Class C) | Optimized for combined loads and provides high system rigidity. |
| GC | Universal Matchable (SU) bearing group | Enables flexible mounting in pairs (back-to-back, face-to-face) or stacked sets to achieve specific preload or clearance. |
| P4 | Tolerance class per ISO standards | Denotes high precision with tight tolerances on bore, OD, and width for superior running accuracy. |
71821 CDGC/P4 Bearing Structural Features & Performance Benefits
High Precision & Rigidity: Manufactured to P4 tolerance standards with a 15° contact angle and a defined preload, this bearing delivers exceptional rotational accuracy and stiffness, which is critical for minimizing deflection under load in precision applications.
Optimized Load Capacity: The angular contact design is specifically engineered to handle high axial loads in one direction simultaneously with radial loads. With a dynamic load rating of 5152 lbf and a static load rating of 6750 lbf, it offers reliable performance in demanding conditions.
High-Speed Capability: The lightweight phenolic resin cage ensures excellent stability and guidance of the 35 high-grade chrome steel balls, contributing to smooth operation and a high limiting speed of 16,000 rpm. The open design facilitates efficient lubrication management.
Universal Matching & Versatility: As a Universal Matchable (SU) bearing, it can be precisely paired with other bearings from the same group to form a matched set, allowing engineers to fine-tune the bearing arrangement's preload and rigidity for the specific application.
71821 CDGC/P4 Bearing Typical Application Areas
The 71821 CDGC/P4 is ideally suited for high-performance machinery where precision and speed are paramount. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: Applications in PCB drilling, semiconductor manufacturing, and precision engraving.
- High-Frequency Motors: Spindles for routers and other high-RPM electric motors.
- Medical Equipment: Centrifuges and other high-speed laboratory or diagnostic apparatus.
