7220 CDGA/P4A
7200 & 7300 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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7220 CDGA/P4A Bearing Product Overview & Core Advantages
The 7220 CDGA/P4A is a single-row angular contact ball bearing engineered for ultra-precision applications requiring exceptional rotational accuracy and high-speed performance. Manufactured to P4A tolerance class, this bearing delivers superior dimensional stability and running accuracy. Its 15° contact angle is optimized for handling combined loads, efficiently supporting significant radial loads alongside substantial axial loads in one direction. The Universal Matchable (SU) designation allows for precise preload control when mounted in carefully matched sets, making it ideal for high-rigidity spindle arrangements. With a phenolic cage and premium lubrication, it achieves an outstanding limiting speed of 16,250 rpm.
7220 CDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7220 | Basic bearing series; 100 mm bore, 180 mm OD, 34 mm width. |
| C | 15° nominal contact angle, optimized for high-speed operation and combined load capacity. |
| DG | Universal Matchable bearing. Can be paired with other SU bearings to form a preloaded set. |
| A | Extra light preload (Class A). Provides minimal internal clearance for high rigidity and precise shaft positioning. |
| P4A | High-precision tolerance class. Exceeds ABEC 7 standards, ensuring extremely tight dimensional and running accuracy. |
7220 CDGA/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The single-row design with an extra light preload (Class A) ensures minimal deflection under load, providing exceptional system stiffness and rotational accuracy critical for machine tool spindles.
- Superior Load Capacity: The 15° contact angle and optimized internal geometry enable the bearing to handle high combined radial and axial loads simultaneously, with a dynamic load rating of 35,100 lbf and a static load rating of 30,825 lbf.
- High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the pre-applied high-quality lubricant allows for a maximum limiting speed of 16,250 rpm, making it a true high-speed bearing.
- Precision Materials: Manufactured from chrome steel for both rings and balls, ensuring high hardness, wear resistance, and long service life under demanding operating conditions.
7220 CDGA/P4A Bearing Typical Application Areas
The 7220 CDGA/P4A is specified in high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Internal and external grinding machines.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM electric motors.
- Industrial Pumps & Compressors: For applications requiring precise shaft control and high-speed operation.
