729 CD/HCP4A
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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729 CD/HCP4A Bearing Product Overview & Core Advantages
The 729 CD/HCP4A is a high-precision, single-row angular contact ball bearing engineered for applications demanding exceptional accuracy and high-speed performance. Its defining characteristic is the 15° contact angle, which is optimized to support significant combined loads—handling both radial and axial loads in one direction simultaneously. Manufactured to the stringent P4 (ABEC-7) tolerance class, this bearing ensures minimal runout and superior rotational precision. The combination of a ceramic ball material and a phenolic cage contributes to lower friction, reduced weight, and the capability for higher limiting speeds, making it an ideal choice for high-rigidity, high-reliability spindles and precision machinery.
729 CD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 729 CD | Basic bearing series designation, indicating the specific internal geometry and bearing dimensions (9mm bore, 26mm OD, 8mm width). |
| HC | Signifies the use of Hybrid Ceramic balls (Silicon Nitride), offering advantages in high-speed operation and longevity. |
| P4 | Denotes the tolerance class, equivalent to ABEC-7. This guarantees ultra-precise dimensions and running accuracy for demanding applications. |
| Open (Seal Type) | The bearing is supplied without seals or shields, allowing for customized lubrication schemes and minimizing torque for maximum limiting speed. |
| Preload: Available | Indicates the bearing can be supplied with a preload, which increases system stiffness and minimizes axial and radial deflection under load. |
729 CD/HCP4A Bearing Structural Features & Performance Benefits
High Rigidity and Precision: The single-row design with a 15° contact angle and availability of preload provides high axial and radial stiffness, which is critical for maintaining accuracy under combined loads.
Superior High-Speed Capability: The hybrid ceramic balls significantly reduce centrifugal forces and friction, while the lightweight phenolic cage ensures stability. This synergy enables the bearing to achieve a high limiting speed of 120,000 rpm.
Optimized Load Capacity: With a dynamic load rating of 922 lbf and a static load rating of 374 lbf, this bearing is designed to handle demanding operational stresses reliably.
Wide Operating Range: The specified materials and construction allow for a broad temperature range from -30°C to 110°C, ensuring performance stability in various environments.
729 CD/HCP4A Bearing Typical Application Areas
The 729 CD/HCP4A is ideally suited for high-performance applications where speed, precision, and rigidity are paramount. Key industries and equipment include:
- High-Frequency Spindles for CNC machining centers and PCB drilling machines
- Precision Instrumentation and medical devices
- High-Speed Motors and turbo-molecular pumps
- Advanced robotics and aerospace actuation systems
