7205 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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7205 CD/HCP4A Bearing Product Overview & Core Advantages
The 7205 CD/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. Engineered to accommodate combined loads (radial and axial loads simultaneously), this single bearing features a 15° contact angle and is supplied with a preload for enhanced system stiffness and precise shaft positioning. Its construction with a phenolic cage and ceramic balls enables superior high-speed performance, making it an ideal solution for machine tool spindles and other high-precision machinery.
7205 CD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7205 | Basic bearing series and size designation (25mm bore, 52mm OD, 15mm width). |
| C | Specifies a 15° contact angle. |
| D | Indicates the bearing is supplied with a preload for high rigidity. |
| HC | Refers to the Hybrid Ceramic construction, featuring ceramic balls and a steel ring. |
| P4 | Denotes a high-precision tolerance class (ABEC-7 / ISO P4). |
| A | Specifies a 30° contact angle (Note: This may indicate a specific internal design variant; the primary contact angle for this model is 15° as per specifications). |
7205 CD/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Design: The combination of chrome steel rings and ceramic (silicon nitride) balls significantly reduces centrifugal forces, lowers operating temperature, and extends service life, especially in high-speed applications.
- High Rigidity & Precision: The bearing is supplied with an internal preload, which minimizes axial and radial play. This results in superior system stiffness, precise rotational accuracy, and reduced vibration, critical for machining accuracy.
- Optimized High-Speed Capability: The lightweight phenolic resin cage offers excellent dimensional stability and low friction, contributing to the high limiting speed of 53,000 rpm. The open design allows for efficient lubrication management.
- Superior Load Capacity: The angular contact design is engineered to handle significant combined loads, providing a high dynamic and static load rating for its compact bearing dimensions.
7205 CD/HCP4A Bearing Typical Application Areas
This precision bearing is ideally suited for applications where high speed, rigidity, and accuracy are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: High-accuracy robotic arms and joints.
- High-Frequency Motors and Spindles: Motors for PCB drilling and dental handpieces.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instruments.
