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  4. 681 Miniature Bearing 1x3x1mm – S681 304 Stainless Steel Open Type | NKMB Micro Bearing Manufacturer
681 Miniature Bearing 1x3x1mm – S681 304 Stainless Steel Open Type | NKMB Micro Bearing Manufacturer

681 Miniature Bearing 1x3x1mm – S681 304 Stainless Steel Open Type | NKMB Micro Bearing Manufacturer

681 Miniature Bearing 1x3x1mm – Ultra Micro Precision Solution by NKMB The 681 miniature bearing 1x3x1mm is one of the smallest deep groove ball bearings available in the micro bearing market. The 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: Diâmetro interno (ID): 1 mm Outer Diameter (OD): 3 mm Width (Thickness): 1 mm Model variations: 681 – Chrome steel version S681 – 304 stainless steel version 681 Open Type – Without shields…

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681 Miniature Bearing 1x3x1mm – Ultra Micro Precision Solution by NKMB

O 681 miniature bearing 1x3x1mm is one of the smallest deep groove ball bearings available in the micro bearing market. O 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:

  • Diâmetro interno (ID): 1 milímetro

  • Diâmetro externo (OD): 3 milímetro

  • Largura (Thickness): 1 milímetro

Model variations:

  • 681 – Chrome steel version

  • S681 – 304 stainless steel version

  • 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

Material: 304 Aço inoxidável

O S681 stainless steel bearing offers:

  • Excellent corrosion resistance

  • Rust protection in humid environments

  • Stable performance in precision devices

  • Smooth surface finishing

Open Type Design Advantages

O 681 open type bearing features:

  • Lower friction

  • Higher rotational speed

  • Easier cleaning

  • Reduced torque resistance

NKMB 681 / S681 Technical Specifications

Item Specification
Bearing Model 681 / S681
Tamanho do furo 1 milímetro
Diâmetro externo 3 milímetro
Largura 1 milímetro
Material 304 Aço inoxidável
Tipo Open
Precision Grade P0 / P6 Available
Clearance C0 / C2 Optional
Cage Material Aço inoxidável
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

O 681 miniature bearing 1x3x1mm is widely used in:

  • Micro electric motors

  • Medical equipment

  • Dental handpieces

  • Smart wearable devices

  • Optical instruments

  • Precision instruments

  • Micro robotics

NKMB micro bearings are engineered for high-speed and ultra-compact mechanical systems.

Why Choose NKMB 681 Rolamentos em miniatura?

✅ High Precision Manufacturing

Micro-level machining ensures accurate roundness and concentricity.

✅ Strict Quality Control

100% inspection before shipment.

✅ OEM & Custom Solutions

  • Custom clearance

  • Special grease (including food grade)

  • Embalagem personalizada

✅ Stable Global Supply

Reliable exporter of 681 miniature bearings 1x3x1mm.

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