7028 CD/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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7028 CD/P4A Bearing Product Overview & Core Advantages
The 7028 CD/P4A is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and rigidity. Engineered to a P4 (ABEC-7) tolerance class, this bearing is optimized to handle combined loads, supporting significant radial loads and axial loads in one direction. Its single, preloaded arrangement ensures minimal axial play, providing superior rotational accuracy and system stiffness. Manufactured from high-grade chrome steel and featuring a phenolic cage, the 7028 CD/P4A is built for high-speed performance and reliable operation in demanding industrial environments.
7028 CD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7028 | Standard bearing series number, indicating the bearing dimensions (140mm bore, 210mm OD, 33mm width). |
| CD | Indicates a specific contact angle of 15° and a preload level, optimizing the bearing for high rigidity and precise shaft positioning. |
| P4 | Denotes the tolerance class, equivalent to ABEC-7. This signifies extremely tight dimensional and running accuracy for high-precision applications. |
| A | Specifies that the bearing is supplied with a standard internal clearance suitable for the applied preload and typical operating conditions. |
7028 CD/P4A Bearing Structural Features & Performance Benefits
High Rigidity and Precision: The angular contact design with a 15° contact angle and factory-applied preload eliminates internal clearance, resulting in exceptional system stiffness and precise shaft guidance, critical for minimizing deflection under load.
Superior Load Capacity: Engineered to support combined loads, this bearing offers a high radial dynamic load rating of 34,425 lbf and a radial static load rating of 37,350 lbf, making it suitable for applications with significant radial and one-direction axial forces.
Optimized High-Speed Performance: The lightweight phenolic cage ensures stability and reduces centrifugal forces, contributing to a high limiting speed of 10,000 rpm. The bearing is supplied lubricated for immediate operation.
Durable Construction: Components made from chrome steel provide high hardness and wear resistance, ensuring a long service life under demanding conditions within a temperature range of -30° to 110 °C.
7028 CD/P4A Bearing Typical Application Areas
The 7028 CD/P4A precision bearing is ideally suited for high-performance machinery requiring high speed, rigidity, and accuracy. Key application areas include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Gearboxes: Especially in high-power density and servo applications.
- High-Frequency Motors and Spindles: Where minimal runout and high rotational accuracy are paramount.
- Industrial Pumps and Compressors: For reliable performance in demanding fluid handling systems.
