7228 CDGA/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7228 CDGA/P4A Bearing Product Overview & Core Advantages
The 7228 CDGA/P4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and rigidity. Operating under the demanding P4A tolerance class, this bearing is designed to handle combined loads efficiently, with its 15° contact angle providing superior axial load capacity. Its universal matching (SU) capability allows for flexible mounting arrangements in duplex sets, while the phenolic cage and optimized lubrication contribute to its high limiting speed of 11,000 rpm. This configuration makes it ideal for machine tool spindles and other precision machinery where high rigidity and thermal stability are critical.
7228 CDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7228 | Basic bearing series with 140mm bore, 250mm OD |
| C | 15° contact angle design |
| DG | Universal matching bearing (can be paired in any arrangement) |
| A | Extra light preload classification |
| P4A | High precision tolerance class with enhanced running accuracy |
7228 CDGA/P4A Bearing Structural Features & Performance Benefits
Precision Engineering: Manufactured to P4A tolerance class with extremely tight dimensional tolerances (bore/OD tolerance: -0.004mm to 0) ensuring minimal runout and vibration for high-precision applications.
Optimized Load Capacity: The 15° contact angle design provides excellent combined load handling capabilities, with dynamic radial load rating of 49,725 lbf and static radial load rating of 54,000 lbf.
High-Speed Performance: The phenolic cage material offers superior strength-to-weight ratio and excellent sliding properties, enabling the bearing to achieve 11,000 rpm limiting speed while maintaining dimensional stability.
Thermal Management: The phenolic cage's low thermal expansion coefficient and the bearing's optimized internal geometry ensure stable performance across the operating temperature range of -30°C to 110°C.
Universal Matching Capability: As a Universal Matchable (SU) bearing, it can be paired in back-to-back (DB), face-to-face (DF), or tandem (DT) arrangements without selective matching, simplifying installation and maintenance.
7228 CDGA/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring precision and rigidity
- Precision Gearboxes: Industrial transmission systems demanding accurate rotational performance
- High-Speed Motors: Electric motors and generators operating at elevated speeds
- Aerospace Components: Aircraft auxiliary systems and precision mechanisms
- Medical Equipment: High-speed dental handpieces and surgical tools
- Robotics: Precision joints and articulation points in industrial robots
