681 Miniature Bearing 1x3x1mm – Ultra Micro Precision Solution by NKMB
ال 681 miniature bearing 1x3x1mm is one of the smallest deep groove ball bearings available in the micro bearing market. ال S681 304 stainless steel open type bearing is specially designed for ultra-compact precision equipment requiring high speed, low friction, and corrosion resistance.
As a professional micro bearing manufacturer, NKMB provides high-precision 681 miniature bearings with stable quality and global OEM supply capability.
681 Bearing Dimensions (1x3x1mm)
The standard dimensions of the 681 miniature bearing are:
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القطر الداخلي (معرف): 1 المليمتر
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القطر الخارجي (OD): 3 المليمتر
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عرض (Thickness): 1 المليمتر
Model variations:
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681 – Chrome steel version
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S681 – 304 stainless steel version
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681 Open Type – Without shields or seals
The compact size of the 681 bearing 1x3x1mm makes it ideal for micro mechanical assemblies.
S681 304 Stainless Steel Bearing – Open Type Structure
مادي: 304 ستانلس ستيل
ال S681 stainless steel bearing offers:
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Excellent corrosion resistance
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Rust protection in humid environments
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Stable performance in precision devices
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Smooth surface finishing
Open Type Design Advantages
ال 681 open type bearing features:
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Lower friction
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Higher rotational speed
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Easier cleaning
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Reduced torque resistance
NKMB 681 / S681 Technical Specifications
| Item | Specification |
|---|---|
| Bearing Model | 681 / S681 |
| حجم التجويف | 1 المليمتر |
| القطر الخارجي | 3 المليمتر |
| عرض | 1 المليمتر |
| مادي | 304 ستانلس ستيل |
| نوع | Open |
| Precision Grade | P0 / P6 Available |
| Clearance | ج0 / C2 Optional |
| Cage Material | ستانلس ستيل |
| Max Speed | Up to 80,000 RPM |
| Operating Temperature | -20°C to +120°C |
| Noise Level | Low Noise Z1 / Z2 |
All data based on NKMB standard production testing.
Applications of 681 Miniature Bearing 1x3x1mm
ال 681 miniature bearing 1x3x1mm is widely used in:
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Micro electric motors
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Medical equipment
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Dental handpieces
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Smart wearable devices
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Optical instruments
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Precision instruments
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Micro robotics
NKMB micro bearings are engineered for high-speed and ultra-compact mechanical systems.
Why Choose NKMB 681 Miniature Bearings?
✅ High Precision Manufacturing
Micro-level machining ensures accurate roundness and concentricity.
✅ Strict Quality Control
100% inspection before shipment.
✅ OEM & Custom Solutions
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Custom clearance
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Special grease (including food grade)
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تغليف حسب الطلب
✅ Stable Global Supply
Reliable exporter of 681 miniature bearings 1x3x1mm.







