7224 CD/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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7224 CD/P4A Bearing Product Overview & Core Advantages
The 7224 CD/P4A is a single-row angular contact ball bearing designed for applications demanding high precision and superior performance under combined loads. As a P4 (ABEC-7) tolerance class bearing, it offers exceptional dimensional accuracy and running precision. Its key advantage lies in its ability to support substantial radial loads and unidirectional axial loads simultaneously, making it ideal for high-speed spindles and other precision machinery where high rigidity and operational accuracy are critical. The bearing is supplied with a preload for immediate, precise operation.
7224 CD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7224 | Basic bearing series and size designation (120mm bore, 215mm OD, 40mm width). |
| C | Specifies a 15° contact angle, optimized for high-speed applications requiring high rigidity. |
| D | Indicates the bearing is supplied with a preload for enhanced stiffness and reduced axial/radial runout. |
| P4A | Denotes a P4 tolerance class (equivalent to ABEC-7), signifying superior dimensional and running accuracy. |
7224 CD/P4A Bearing Structural Features & Performance Benefits
Optimized Internal Geometry & Material Selection: The bearing features a 15° contact angle and a phenolic resin cage, which is lightweight and robust, contributing to lower centrifugal forces and enabling a high limiting speed of 10,000 rpm. The use of high-grade chrome steel for both rings and balls ensures excellent durability and fatigue resistance.
High Load Capacity & Rigidity: Engineered with a specific internal geometry including 15 balls of 30.162 mm diameter, this bearing achieves a high dynamic load rating of 44,775 lbf and a static load rating of 43,425 lbf. The application of a preload (D) significantly increases system rigidity, minimizing deflection under load for superior machining accuracy.
Precision & Reliability: Manufactured to P4 tolerance class, the bearing ensures minimal runout and vibration. The open seal type allows for optimal lubrication management in controlled environments, supporting a wide operating temperature range from -30°C to 110°C.
7224 CD/P4A Bearing Typical Application Areas
The 7224 CD/P4A is ideally suited for high-performance applications where precision and speed are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes: For robotics, aerospace, and high-end automotive systems.
- High-Frequency Motors & Spindles: Used in PCB drilling and CNC machining.
- Medical Equipment: High-speed centrifuges and imaging device rotors.
