7228 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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7228 CD/HCP4A Bearing Product Overview & Core Advantages
The 7228 CD/HCP4A is a single-row angular contact ball bearing engineered for high-precision and high-speed applications. Its defining characteristic is the 15° contact angle, optimized to handle significant combined loads—both radial and axial—simultaneously. Manufactured to P4 (ABEC-7) tolerance class, it guarantees exceptional running accuracy and dimensional stability. The use of ceramic balls and a phenolic cage contributes to lower friction, higher limiting speeds, and extended service life, making it a superior choice for demanding operational environments.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 7228 | Basic bearing series and size designation (140mm bore, 250mm OD). |
| CD | Indicates a high-contact angle (15°) design, optimized for high axial load capacity and rigidity. |
| HC | Signifies the use of Hybrid Ceramic balls, which reduce weight and friction for superior high-speed performance. |
| P4 | Denotes the P4 (ABEC-7) tolerance class, ensuring ultra-precise dimensions and runout for critical applications. |
| A | Specifies that the bearing is supplied with a preload for enhanced stiffness and precise shaft positioning. |
7228 CD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The optimized 15° contact angle and robust construction enable the bearing to support substantial combined radial and axial loads. The applied preload further increases system stiffness, minimizing deflection under load.
- Superior High-Speed Performance: The combination of hybrid ceramic balls and a lightweight phenolic resin cage significantly reduces centrifugal forces and operating temperatures, allowing for a high limiting speed of 10,000 rpm.
- Extended Service Life and Reliability: Ceramic balls are electrically insulating and highly wear-resistant, while the phenolic cage offers excellent strength and guidance at high speeds. This results in reduced maintenance intervals and greater operational reliability.
- Precision Engineering: Manufactured to P4 tolerance class with tight dimensional controls on the bore diameter, outside diameter, and width, ensuring predictable performance and easy integration into precision assemblies.
7228 CD/HCP4A Bearing Typical Application Areas
The 7228 CD/HCP4A is ideally suited for high-performance machinery requiring precision, speed, and rigidity. Key sectors include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and auxiliary power units (APUs).
- High-Speed Motors and Compressors: Where low friction and high rotational accuracy are critical.
