728 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
Ball & Washer Dimensions
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728 CD/HCP4A Bearing Product Overview & Core Advantages
The 728 CD/HCP4A is a single-row angular contact ball bearing engineered for applications demanding high precision and superior rotational accuracy. Characterized by its 15° contact angle and availability with preload, this bearing is designed to handle significant combined loads—primarily thrust loads in one direction along with radial loads. Its compact design, featuring a phenolic resin cage and ceramic balls, makes it an ideal solution for high-speed and high-reliability applications where minimal vibration and heat generation are critical.
728 CD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Significance & Benefit |
|---|---|---|
| CD | Optimized internal geometry for high-precision applications | Ensures consistent performance, reduced noise, and lower torque. |
| HC | Hybrid Ceramic (Ceramic balls with steel rings) | Enables higher limiting speeds, reduced weight, and longer service life due to ceramic's lower density and superior hardness. |
| P4 | Tolerance class equivalent to ABEC-7 | Guarantees ultra-precision running accuracy, essential for applications requiring minimal runout and vibration. |
| A | 30° contact angle (Note: This model has a 15° angle, "A" may denote a specific internal design variant) | Please consult factory specifications for precise internal design details. |
728 CD/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, allowing for a limiting speed of 130,000 rpm. This construction also provides electrical insulation, reduced wear, and extended lubrication life.
- Phenolic Resin Cage: The lightweight and robust phenolic cage contributes to smooth operation at high speeds, offers good dimensional stability, and is suitable for the specified temperature range.
- High Rigidity & Load Capacity: The angular contact design and availability with preload provide high axial and radial rigidity, enabling the bearing to handle combined loads effectively with a dynamic load rating of 835 lbf.
- Precision & Reliability: Manufactured to P4 (ABEC-7) tolerance class, this bearing ensures exceptional running accuracy, low vibration, and consistent performance in demanding applications.
728 CD/HCP4A Bearing Typical Application Areas
The 728 CD/HCP4A is ideally suited for high-performance machinery where speed, precision, and reliability are paramount. Key application areas include:
- High-Speed Spindles for CNC machining centers, routers, and grinders
- Precision Instrumentation and medical devices
- High-Frequency Motors and turbo-molecular pumps
- Aerospace & Defense systems requiring reliable, high-speed rotation
