7028 CDGA/P4A
7000 Series Super Precision Angular Contact Ball 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
7028 CDGA/P4A Bearing Product Overview & Core Advantages
The 7028 CDGA/P4A is a single row angular contact ball bearing engineered for applications demanding ultra-high precision and exceptional operational performance. Manufactured to the stringent P4A tolerance class, this bearing is designed to handle significant combined loads (radial and axial) simultaneously. Its 15° contact angle and extra light preload (Class A) make it an ideal choice for high-speed spindles and other precision machinery where minimal deflection and superior running accuracy are critical. The bearing is universally matchable (SU), allowing for flexible mounting in various preloaded configurations to achieve optimal system rigidity.
7028 CDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7028 | Basic bearing designation, indicating a metric series bearing with a 140 mm bore and 210 mm outside diameter. |
| C | Designates a 15° contact angle, optimized for high-speed applications. |
| DG | Indicates the bearing is universally matchable (SU) and can be paired in any combination to achieve different preload levels. |
| A | Signifies an extra light preload (Class A), which minimizes friction and heat generation at high speeds. |
| P4A | Denotes an ultra-precision tolerance class with very tight limits on bore, outside diameter, and width for superior running accuracy. |
7028 CDGA/P4A Bearing Structural Features & Performance Benefits
High-Speed Capability: The combination of a 15° contact angle, phenolic resin cage, and extra light preload enables a high limiting speed of 6,300 rpm. The phenolic cage offers excellent strength-to-weight ratio and operates smoothly with minimal friction.
Ultra-Precision Performance: Manufactured to P4A tolerance standards, this bearing ensures minimal runout and vibration, which is critical for applications requiring extreme positional accuracy and surface finish quality.
Superior Load Capacity: With a dynamic load rating of 34,425 lbf and a static load rating of 37,350 lbf, the 7028 CDGA/P4A is capable of handling significant combined radial and axial loads.
Optimized Material Selection: The use of high-grade chrome steel for both rings and balls ensures high hardness, wear resistance, and long service life under demanding conditions.
7028 CDGA/P4A Bearing Typical Application Areas
The 7028 CDGA/P4A is ideally suited for high-performance machinery where precision and speed are paramount. Key applications include:
- Machine Tool Spindles: For CNC machining centers, grinding spindles, and milling spindles requiring high rigidity and running accuracy.
- High-Speed Motors and Drives: Used in precision electric motors and frequency converter-driven systems.
- Precision Rotary Tables: Providing accurate and repeatable positioning in indexing and rotary applications.
- Aerospace and Defense Systems: In gyroscopes, radar equipment, and other critical navigation and control systems.
