S7209 CD/P4ADBA
Sealed Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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S7209 CD/P4ADBA Bearing Product Overview & Core Advantages
The S7209 CD/P4ADBA is a precision duplex angular contact ball bearing designed for applications demanding exceptional rigidity and running accuracy. This matched set features a back-to-back (DB) arrangement and is manufactured to P4A tolerance class, ensuring superior dimensional and rotational precision. Its core advantage lies in its ability to support combined loads (radial and axial) simultaneously from both directions, making it ideal for high-speed, high-rigidity spindles and precision machinery where minimal deflection is critical.
S7209 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
- S7: High-precision bearing series.
- 209: Standard dimension series; 45 mm bore, 85 mm OD.
- CD: Duplex bearing with a Back-to-Back (DB) arrangement and Extra light preload (Class A).
- P4A: Tolerance class denoting very high precision for both dimension and running accuracy.
- DBA: Indicates the bearing is one of a matched set of two bearings (Duplex Back-to-Back Arrangement).
S7209 CD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) design creates a wide effective spread, significantly increasing system rigidity and moment load capacity. This configuration is exceptionally effective at handling combined radial and bidirectional axial loads.
Precision & High-Speed Performance: Manufactured to a P4A tolerance class with a 15° contact angle, this bearing ensures smooth, quiet operation and minimal rotational error. The phenolic cage is lightweight and robust, contributing to lower centrifugal forces and enabling high limiting speeds (46,000 rpm).
Sealed & Pre-lubricated: The bearing is sealed to protect against contamination and is pre-lubricated with grease, offering a maintenance-free solution within its specified temperature range of -30°C to 110°C.
S7209 CD/P4ADBA Bearing Typical Application Areas
The S7209 CD/P4ADBA is engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, semiconductor manufacturing equipment.
- High-Frequency Motors: Spindles for routers and other high-RPM machinery.
- Medical Equipment: High-speed centrifuges and dental handpieces.
