S681x
600 Series Stainless Steel Miniature Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Inner Ring Dimensions
Ball & Washer Dimensions
Performance
Materials
Environment & Compliance
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S681x Bearing Product Overview & Core Advantages
The S681x is a miniature metric single row deep groove ball bearing designed for applications demanding compact size and reliable performance. Engineered with stainless steel construction throughout its rings, balls, and cage, it offers excellent corrosion resistance. This bearing is optimized for handling radial loads and is characterized by its extremely small dimensions (1.5mm bore, 4mm OD) and low weight (0.1g), making it ideal for high-precision, space-constrained mechanisms. Its ABEC1 tolerance class ensures consistent operational accuracy for a wide range of industrial and consumer applications.
S681x Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| S681 | Indicates the bearing series, defining the core dimensions (1.5mm bore, 4mm OD, 1.2mm width). |
| x (Open) | Signifies an open (unsealed) bearing design. This allows for custom lubrication schemes but requires a clean operating environment. |
| Implied: Stainless Steel | The S-prefix and material specification indicate full stainless steel construction for enhanced corrosion resistance. |
S681x Bearing Structural Features & Performance Benefits
Compact and Lightweight Design: With a width of just 1.2 mm and a weight of 0.1 g, this bearing is engineered for miniaturized assemblies without sacrificing performance.
Corrosion Resistance: The use of stainless steel for all critical components (rings, balls, cage) ensures long-term reliability in humid or mildly corrosive environments, complying with ROHS and REACH standards.
Precision Performance: Manufactured to ABEC1 tolerance standards, it provides smooth and consistent operation, which is critical for sensitive instrumentation.
Optimized Internal Geometry: Featuring 7 balls of 0.6 mm diameter and an MC3 radial internal clearance (0.002mm to 0.013mm), the bearing offers a balance between low running torque and stable operation under light loads.
High-Speed Capability: The limiting speed of 90,000 rpm makes it suitable for high-speed miniature spindles and small motors.
S681x Bearing Typical Application Areas
- Precision Instruments: Optical encoders, gauges, and laboratory equipment.
- Small Motors and Spindles: Miniature DC motors, dental handpieces, and high-speed spindles.
- Consumer Electronics: Small fans, disk drive mechanisms, and miniature robotics.
- Medical Devices: Surgical tools, pumps, and diagnostic equipment where compact size and reliability are paramount.
- Office Automation: Printers, scanners, and copiers.
