728 CD/P4ADT
Miniature Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 728 CD/P4ADT is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This duplex tandem (DT) arrangement consists of two matched bearings, preloaded to deliver superior high rigidity and axial load capacity in one direction. Manufactured to the exacting P4A tolerance class, it ensures minimal runout and stable rotational characteristics, making it ideal for high-speed spindles and precision machinery where uncompromising accuracy is critical.
728 CD/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 728 CD | Basic bearing designation, indicating a specific angular contact bearing series with a 15° contact angle. |
| /P4A | Denotes a high-precision tolerance class (superior to ABEC 7), ensuring extremely tight dimensional and running accuracy. |
| DT | Indicates a Duplex Tandem arrangement. Two bearings are mounted together to significantly increase axial load capacity in a single direction. |
Structural Features and Performance Benefits
High Rigidity and Axial Load Capacity: The duplex tandem arrangement and factory-applied preload create an exceptionally stiff bearing set, capable of handling heavy combined loads with minimal deflection. This configuration is optimized for applications requiring high unidirectional thrust loads.
High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the optimized internal geometry and 15° contact angle contribute to a high limiting speed of 220,000 rpm, making it a true high-speed bearing.
Precision and Stability: Manufactured to P4A standards with tight bearing dimensions and tolerances, this bearing guarantees low vibration and high running accuracy, which is essential for precision applications.
Durability and Reliability: Constructed from high-grade chrome steel for both rings and balls, the bearing offers excellent wear resistance and long service life under demanding operating conditions.
728 CD/P4ADT Bearing Typical Application Areas
This high-precision, preloaded bearing set is ideally suited for applications where maximum axial stiffness and accuracy are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Rotary Systems: Industrial robotics, indexing tables, and rotary actuators.
- High-Frequency Spindles: PCB drilling and routing machines.
- Medical and Laboratory Equipment: Centrifuges and high-speed scanners.
