S7213 CD/P4A
Sealed Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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S7213 CD/P4A Bearing Product Overview & Core Advantages
The S7213 CD/P4A is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Engineered to a P4 (ABEC-7) tolerance class, it is ideally suited for high-speed spindles and other precision machinery. Its key advantage lies in its ability to handle combined loads—simultaneously supporting significant radial loads and thrust loads in one direction. The phenolic cage and pre-lubrication contribute to its high-speed capabilities and reliable, long-term performance.
Model Code Breakdown
- S7213: Basic designation indicating a single-row angular contact ball bearing with a 65mm bore and 120mm outside diameter.
- C: Denotes a 15° contact angle, optimized for high-speed operation.
- D: Indicates the bearing is supplied with a specific preload for enhanced rigidity and precise shaft positioning.
- P4A: Specifies the tolerance class. P4 is equivalent to ABEC-7, representing a very high level of dimensional and running accuracy.
S7213 CD/P4A Bearing Structural Features & Performance Benefits
High Rigidity and Precision: The single-row design with a phenolic resin cage and a 15° contact angle provides high running accuracy and system rigidity, which is critical for machine tool spindles. The application of a preload (D) further enhances this rigidity, minimizing axial and radial deflection under load.
High-Speed Performance: The lightweight phenolic cage is essential for high-speed operation, reducing centrifugal forces and allowing for a limiting speed of 12,000 rpm. The bearing is factory-lubricated to ensure optimal performance at these high rotational rates.
High Load Capacity: Manufactured from chrome steel for both rings and balls, this bearing offers a high dynamic load rating of 14,918 lbf and a static load rating of 11,925 lbf, ensuring durability under demanding conditions.
S7213 CD/P4A Bearing Typical Application Areas
The S7213 CD/P4A is a critical component in high-performance industrial equipment, including:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- High-Speed Pumps and Compressors
