S639
600 Series Stainless Steel Miniature Bearings
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Basic Information
Main Dimensions
Inner Ring Dimensions
Ball & Washer Dimensions
Performance
Materials
Environment & Compliance
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S639 Bearing Product Overview & Core Advantages
The S639 is a single row deep groove ball bearing engineered for high-performance applications requiring precision and reliability. Constructed entirely from stainless steel, it offers excellent corrosion resistance. This bearing is designed to primarily handle radial loads and is characterized by its compact design with a 9 mm bore, 30 mm outside diameter, and 10 mm width. Its ABEC1 precision class and optimized internal geometry ensure smooth, quiet operation, making it an ideal choice for applications demanding consistent performance and long service life.
S639 Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Interpretation | Technical Significance |
|---|---|---|
| S639 | Basic Bearing Number | Denotes a metric, single row deep groove ball bearing with a 9 mm bore, 30 mm OD, and 10 mm width. |
| No Suffix | Standard Design | Indicates an open (unsealed) bearing with a standard stainless steel cage, requiring external lubrication. |
S639 Bearing Structural Features & Performance Benefits
- High Corrosion Resistance: Manufactured from stainless steel for rings, balls, and cage, providing superior performance in harsh or wash-down environments.
- Precision Performance: The ABEC1 tolerance class ensures high running accuracy and low vibration, contributing to the overall efficiency of the assembly.
- Optimized Internal Geometry: Features 7 precision balls with a diameter of 4.762 mm, designed for smooth rotation and effective radial load distribution.
- High-Speed Capability: With a limiting speed of 21,600 rpm, it is suitable for high-velocity applications. The open design facilitates optimal lubrication flow for cooling and friction reduction.
- Controlled Internal Clearance: The MC3 radial internal clearance (0.002mm to 0.013mm) is suited for applications where precise fits and thermal expansion management are critical.
S639 Bearing Typical Application Areas
The S639 bearing is widely used in various precision instruments and machinery, including:
- Precision Electric Motors and Small Gearboxes
- Medical and Dental Equipment
- Food Processing Machinery (due to its stainless steel construction and RoHS/REACH compliance)
- Office Automation Equipment, such as high-speed printers and scanners
- Instrumentation and Measurement Devices
