7038 CD/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
Ball & Washer Dimensions
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7038 CD/P4A Bearing Product Overview & Core Advantages
The 7038 CD/P4A is a single-row angular contact ball bearing engineered for applications demanding exceptional rotational accuracy and high-speed capability. As a P4 (ABEC-7) tolerance class bearing, it is designed for high-precision spindle systems. Its key advantage lies in its ability to accommodate combined loads—significant radial loads and substantial thrust loads in one direction—thanks to its defined 15° contact angle. The bearing is supplied with a preload and features a lightweight phenolic cage, making it an ideal solution for machine tools and other high-performance machinery where high rigidity and minimal rotational deflection are critical.
7038 CD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 7038 | Basic Bearing Number | Defines the standard dimensions: 190mm bore, 290mm OD, 46mm width. |
| CD | Contact Angle & High Rigidity Design | Indicates a 15° contact angle and an optimized internal design for high stiffness. |
| P4 | Tolerance Class | Corresponds to ABEC-7, signifying extremely tight dimensional and running accuracy for precision applications. |
| A | Preload Level | Specifies a light preload, which increases bearing rigidity and ensures precise shaft positioning. |
7038 CD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The single-row angular contact design with a 15° contact angle and built-in preload provides superior shaft support, minimizing deflection under load and ensuring exceptional running accuracy essential for P4 tolerance class performance.
- Superior Load Capacity: Engineered to handle combined loads effectively, with a high radial dynamic load rating of 55,575 lbf and a radial static load rating of 68,625 lbf.
- Optimized High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the open design and pre-lubrication contribute to a high limiting speed of 7,000 rpm, making it a true high-speed bearing.
- Robust Material Construction: Manufactured from chrome steel for both rings and balls, ensuring high durability, wear resistance, and a long operational life under demanding conditions.
7038 CD/P4A Bearing Typical Application Areas
The 7038 CD/P4A is ideally suited for high-precision, high-speed machinery across various industries. Key applications include:
- Machine Tool Spindles: CNC machining centers, grinding spindles, and milling heads.
- High-Frequency Motors and Spindles: Where high rotational speeds and accuracy are paramount.
- Precision Instrumentation: Medical imaging equipment, coordinate measuring machines (CMM).
- Aerospace and Defense Systems: Gyroscopes, radar equipment, and other critical rotating assemblies.
