71902 CD/HCP4ADBA
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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Product Overview and Core Advantages
The **71902 CD/HCP4ADBA** is a **precision angular contact ball bearing** designed for demanding applications requiring exceptional accuracy and performance. This **metric system** bearing features a **duplex back-to-back (DB) arrangement**, providing superior **stiffness** and the ability to handle **combined loads** including radial and bidirectional axial forces. Manufactured to **P4A tolerance class**, it delivers ultra-precise rotational accuracy. The combination of a **ceramic ball** material and **phenolic cage** enables outstanding **high-speed performance**, making it ideal for machine tool spindles and other high-precision, high-reliability equipment.
71902 CD/HCP4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71902 | Basic bearing series and size designation (15mm bore, 28mm OD). |
| CD | Indicates a duplex back-to-back (DB) arrangement of two bearings. |
| HC | Signifies the use of hybrid ceramic balls (Silicon Nitride). |
| P4A | Denotes a high-precision tolerance class for running accuracy. |
| DB | Reiterates the back-to-back mounting configuration. |
| A | Specifies an extra light preload on the bearing set. |
Structural Features and Performance Benefits
High Rigidity and Load Capacity: The duplex back-to-back (DB) arrangement creates a rigid bearing system that effectively resists moment loads and provides exceptional stability. This configuration allows the bearing set to handle significant combined radial and axial loads.
Superior High-Speed Performance: The use of hybrid ceramic balls (lower density than steel) reduces centrifugal forces, while the lightweight phenolic cage ensures stability. This combination enables a very high limiting speed of 230,000 rpm, making it a true high-speed bearing.
Precision and Longevity: Manufactured to P4A tolerance class with a 15° contact angle, this bearing guarantees precise running accuracy and smooth operation. The open seal type is optimized for applications where external sealing is provided, minimizing friction for maximum speed capability.
71902 CD/HCP4ADBA Bearing Typical Application Areas
This high-performance bearing is engineered for the most demanding applications, including:
- Machine Tool Spindles: High-speed machining centers and grinding spindles.
- Precision Instrumentation: Measuring devices and laboratory equipment.
- High-Frequency Motors: Spindles for PCB drilling and dental handpieces.
- Aerospace Systems: Gyroscopes and other critical rotating assemblies.
