71828 CD/P4DBC
71800 Series Super Precision Angular Contact Ball Bearings
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71828 CD/P4DBC Bearing Product Overview & Core Advantages
The 71828 CD/P4DBC is a duplex back-to-back (DB) matched pair of precision angular contact ball bearings designed for exceptional performance in demanding applications. This metric system bearing set is characterized by its P4 tolerance class for high running accuracy and a moderate preload (Class C) that ensures optimal rigidity and rotational precision. Its primary advantage lies in its ability to handle combined loads—significant radial and thrust loads from both directions—simultaneously, making it an ideal solution for high-speed, high-rigidity spindles and precision machinery where stability is paramount.
71828 CD/P4DBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71828 | Basic bearing designation | Defines the core dimensions: 140mm bore, 175mm OD, 36mm width. |
| CD | Duplex Back-to-Back arrangement | The two bearings are mounted back-to-back, providing high moment rigidity and the ability to withstand overturning moments. |
| P4 | Tolerance Class | Indicates high precision with tight dimensional and running accuracy tolerances for superior performance. |
| DB | Matched Set Identifier | Confirms the bearings are supplied as a factory-matched pair for optimal performance in the DB configuration. |
| C | Preload Level (Moderate) | Specifies a moderate preload, balancing high rigidity with manageable operating temperatures. |
71828 CD/P4DBC Bearing Structural Features & Performance Benefits
Optimized for High Rigidity and Precision: The duplex back-to-back (DB) arrangement creates a wide, stable support base that significantly increases system rigidity against moment loads. This is critical for applications requiring minimal shaft deflection under load.
Superior Load Capacity: With a 15° contact angle and a high complement of 35 balls, this bearing set offers an excellent balance, capable of handling high radial dynamic load rating of 16,380 lbf and a radial static load rating of 28,125 lbf, along with substantial bidirectional thrust loads.
High-Speed Capability: The lightweight phenolic cage minimizes centrifugal forces and ensures stable operation at the limiting speed of 11,000 rpm. The open design and factory lubrication facilitate efficient heat dissipation.
Precision Engineering: Manufactured to P4 tolerance class with tight bore, OD, and width tolerances, this bearing guarantees high running accuracy, reduced vibration, and consistent performance in precision spindles.
71828 CD/P4DBC Bearing Typical Application Areas
The 71828 CD/P4DBC is engineered for high-performance machinery where precision, speed, and rigidity are non-negotiable. Its primary applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: For PCB drilling, semiconductor manufacturing, and other high-accuracy processes.
- High-Frequency Motors: Where high rotational speeds and rigidity are required.
- Industrial Pumps and Compressors: For applications demanding high axial and radial load support.
