S7028 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
S7028 CD/HCP4A Bearing Product Overview & Core Advantages
The S7028 CD/HCP4A is a high-precision angular contact ball bearing engineered for applications demanding exceptional rotational accuracy and reliability. This single-row bearing features a 15° contact angle and is supplied with a preload, making it ideal for managing combined loads where high rigidity and precise shaft positioning are critical. Its construction with ceramic balls and a phenolic cage enables superior high-speed performance and reduced rotational inertia. Pre-lubricated and sealed, this bearing offers a maintenance-free solution within its specified operating range.
S7028 CD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| S7028 | Standard bearing series designation, indicating a 140mm bore, 210mm OD, and 33mm width. |
| C | Specifies a 15° contact angle. |
| D | Indicates the bearing is supplied with a preload for enhanced rigidity. |
| HC | Denotes the use of Hybrid Ceramic components (ceramic balls with steel rings). |
| P4 | Specifies a high-precision tolerance class (ABEC-7 / ISO P4). |
| A | Indicates the bearing is sealed on both sides for contamination protection. |
S7028 CD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The combination of a 15° contact angle and an applied preload significantly increases system stiffness, minimizes axial and radial play, and ensures exceptional running accuracy, which is critical for precision bearing applications.
- Superior High-Speed Capability: The hybrid ceramic design, featuring ceramic balls and a lightweight phenolic cage, reduces centrifugal forces and friction. This allows for a higher limiting speed (7,500 rpm), lower operating temperatures, and extended service life compared to all-steel equivalents.
- Excellent Load Capacity: Designed to support combined loads (simultaneous radial and axial loads), with a radial dynamic load rating of 34,425 lbf and a radial static load rating of 37,350 lbf.
- Maintenance-Free Operation: As a sealed and pre-lubricated unit, the bearing is protected from contaminants and is ready for installation, eliminating the need for relubrication in many applications and reducing total cost of ownership.
S7028 CD/HCP4A Bearing Typical Application Areas
The S7028 CD/HCP4A is ideally suited for high-performance machinery requiring high speed, precision, and reliability. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and spindle drives.
- High-Frequency Motors and Spindles: Where low inertia and high rotational accuracy are paramount.
- Medical and Dental Equipment: High-speed handpieces and scanners.
- Aerospace Actuators and Instrumentation: Applications demanding reliability in a sealed-for-life configuration.
