71828 CDGA/P4
71800 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
Ball & Washer Dimensions
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71828 CDGA/P4 Bearing Product Overview & Core Advantages
The 71828 CDGA/P4 is a single-row angular contact ball bearing engineered for applications demanding high precision and superior running accuracy. Positioned in the P4 tolerance class, it delivers exceptional dimensional stability and rotational precision. Its 15° contact angle is optimized for handling combined loads, efficiently supporting significant radial loads alongside axial loads in one direction. The phenolic resin cage and factory-applied lubrication contribute to its high-speed capability, with a limiting speed of 11,000 rpm, making it an ideal high-speed bearing for precision spindles and machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71828 | Basic bearing designation, defining the bearing dimensions (140mm bore, 175mm OD, 18mm width). |
| C | Designates a 15° contact angle. |
| DG | Indicates the bearing is Universal Matchable (SU). Two bearings can be mounted in a duplex arrangement (face-to-face, back-to-back, or tandem) to adjust preload and rigidity. |
| A | Signifies an Extra light preload (Class A). |
| /P4 | Denotes a high-precision tolerance class with extremely tight running accuracy and dimensional tolerances. |
71828 CDGA/P4 Bearing Structural Features & Performance Benefits
High-Precision Construction: Manufactured to P4 tolerance class with bore and outside diameter tolerances of -0.004mm to 0, ensuring minimal runout and vibration for ultra-smooth operation in precision machinery.
Optimized Load Capacity: The 15° contact angle and robust internal geometry provide an excellent radial dynamic load rating of 10,102 lbf and a static load rating of 13,950 lbf, enabling reliable performance under combined loads.
Superior High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the pre-lubrication minimizes friction, collectively enabling the high limiting speed of 11,000 rpm.
Universal Matching Capability (SU): As a Universal Matchable bearing, it offers flexibility in mounting configurations. When used in a matched set of 2, engineers can achieve the desired preload and system rigidity for specific application requirements.
71828 CDGA/P4 Bearing Typical Application Areas
The 71828 CDGA/P4 is specified for high-performance applications where precision, speed, and reliability 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 and Spindles: Applications requiring minimal vibration and high rotational accuracy.
- Medical and Dental Equipment: High-speed handpieces and scanners.
- Aerospace and Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
