S7213 CD/P4ADFA
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/P4ADFA Bearing Product Overview & Core Advantages
The S7213 CD/P4ADFA is a metric precision angular contact ball bearing designed for high-performance applications requiring exceptional rigidity and running accuracy. This duplex face-to-face (DF) matched set features an Extra light (Class A) preload, making it ideal for machine tool spindles and other high-speed, high-precision machinery. Its sealed design and P4A tolerance class ensure reliable operation, long service life, and the ability to handle combined radial and axial loads simultaneously.
Model Code Breakdown
- S7213: Basic bearing series and size designation (65mm bore, 120mm OD).
- CD: Indicates a duplex face-to-face (DF) matched pair configuration.
- P4A: Denotes a very high tolerance class for superior dimensional and running accuracy.
- DFA: Specifies the bearing is supplied as a pre-loaded duplex set (Face-to-Face) with an Extra light (Class A) preload.
S7213 CD/P4ADFA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex face-to-face arrangement of two bearings provides significantly increased system rigidity and excellent stability under combined loads and moment loads. The 15° contact angle is optimized for supporting substantial axial loads in both directions.
Precision & High-Speed Performance: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration. The phenolic resin cage is lightweight and robust, contributing to smooth operation and a high limiting speed of 36,000 rpm. The sealed design protects against contamination.
Durability & Reliability: Constructed from chrome steel for both rings and balls, the bearing offers high fatigue life. It is pre-lubricated with grease suitable for a temperature range of -30°C to 110°C, ensuring immediate readiness for installation and long-term, maintenance-free operation.
S7213 CD/P4ADFA Bearing Typical Application Areas
This high-precision bearing set is engineered for demanding applications, including:
- Machine Tool Spindles (e.g., milling, grinding, and turning centers)
- High-Frequency Motors
- Precision Gearboxes
- Industrial Pumps and Compressors
- Medical and Laboratory Equipment
