S638zz
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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S638zz Bearing Product Overview & Core Advantages
The S638zz is a stainless steel miniature ball bearing designed for precision applications requiring high reliability in compact spaces. As a single row deep groove ball bearing, it excels at handling primarily radial loads while also accommodating moderate axial loads in both directions. Its shielded design offers protection against contamination, making it suitable for applications demanding consistent performance and longevity. Manufactured entirely from corrosion-resistant stainless steel, it is ideal for environments where moisture or chemicals are present. With an ABEC1 precision class, this bearing provides excellent value for high-volume applications requiring dependable operation.
S638zz Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning | Advantage |
|---|---|---|
| S | Stainless Steel Construction | Superior corrosion resistance for harsh environments |
| 6 | Deep Groove Ball Bearing | Versatile load capacity and high-speed capability |
| 38 | Bore Diameter: 8 mm | Standard metric sizing for easy integration |
| zz | Double Shielded (Both Sides) | Enhanced contamination protection and lubricant retention |
S638zz Bearing Structural Features & Performance Benefits
Compact Design & High Precision: With dimensions of 8mm bore × 28mm OD × 9mm width and ABEC1 tolerance class, this bearing delivers precise rotational accuracy in space-constrained applications. The deep groove raceway and optimized ball complement (7 balls of 4.762mm diameter) ensure smooth operation and efficient load distribution.
Superior Material Construction: All components – rings, balls, cage, and shields – are manufactured from stainless steel, providing excellent corrosion resistance and durability. This makes the bearing suitable for washdown environments, medical equipment, and food processing applications.
Enhanced Protection & Maintenance: The double-shielded (zz) design effectively excludes contaminants while retaining lubrication. Combined with MC3 radial internal clearance (0.002mm to 0.013mm), this configuration ensures reliable performance across the operating temperature range of -30°C to 110°C.
Balanced Performance Characteristics: The bearing offers a radial dynamic load rating of 785 lbf and static load rating of 321 lbf, supporting substantial loads relative to its compact size. With a limiting speed of 25,200 rpm, it delivers excellent performance in high-speed applications.
S638zz Bearing Typical Application Areas
- Medical Devices: Surgical handpieces, dental tools, laboratory equipment
- Precision Instruments: Optical encoders, measuring devices, scientific instruments
- Small Motors & Drives: Stepper motors, DC motors, fan motors
- Office Automation: Printers, scanners, copiers
- Food Processing Equipment: Where corrosion resistance and cleanability are essential
- Robotics & Automation: Small joints, positioning systems, guidance mechanisms
