7228 CD/P4ADGC
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7228 CD/P4ADGC Bearing Product Overview & Core Advantages
The 7228 CD/P4ADGC is a precision angular contact ball bearing designed for demanding applications requiring high rotational accuracy and rigidity. As a universally matchable (SU) bearing supplied in a pre-set pair, it is engineered to accommodate combined loads—significant radial and axial loads in both directions. Its P4A tolerance class ensures ultra-precision operation, while the moderate preload (Class C) provides excellent shaft guidance and system stiffness, making it ideal for high-speed, high-reliability spindles and precision machinery.
7228 CD/P4ADGC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7228 | Basic bearing series and size designation (140mm bore, 250mm OD). |
| CD | A 15° contact angle and specific internal design optimized for high-speed operation and universal matching. |
| P4A | Indicates an ultra-precision tolerance class exceeding ABEC 7/ISO P4, with enhanced running accuracy specifications. |
| DGC | Signifies the bearing is part of a universally matchable (SU) pair, supplied lubricated and ready for installation as a pre-loaded set. |
7228 CD/P4ADGC Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The double row angular contact design and moderate preload provide exceptional system stiffness, enabling precise control under heavy combined loads. With a dynamic load rating of 80,550 lbf and a static load rating of 108,000 lbf, it offers robust performance.
Optimized High-Speed Performance: The phenolic cage and 15° contact angle are key to achieving a high limiting speed of 11,000 rpm. This combination reduces centrifugal forces and friction, ensuring stable operation at high velocities.
Precision and Longevity: Manufactured to P4A tolerances from chrome steel for both rings and balls, this bearing guarantees minimal runout and consistent performance. The pre-applied lubrication supports immediate startup and reliable operation within a temperature range of -30°C to 110°C.
7228 CD/P4ADGC Bearing Typical Application Areas
This bearing is specified for high-performance applications where precision, speed, and rigidity are paramount. Typical uses include:
- Machine Tool Spindles: For CNC milling, grinding, and turning centers.
- High-Speed Machining Centers: Providing the necessary accuracy and stiffness for fine finishing.
- Precision Grinding Spindles: Where minimal runout and thermal stability are critical.
- Industrial Pumps and Compressors: For applications requiring reliable operation under combined loads.
