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

681 miniature bearing 1x3x1mm is one of the smallest deep groove ball bearings available in the micro bearing market. ザ S681 304 stainless steel open type bearing is specially designed for ultra-compact precision equipment requiring high speed, 低摩擦, 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:

  • 内径 (身分証明書): 1 ミリメートル

  • 外径 (外径): 3 ミリメートル

  • 幅 (Thickness): 1 ミリメートル

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

材料: 304 ステンレススチール

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

681 open type bearing 顔立ち:

  • Lower friction

  • Higher rotational speed

  • Easier cleaning

  • Reduced torque resistance


NKMB 681 / S681 Technical Specifications

Item Specification
Bearing Model 681 / S681
ボアサイズ 1 ミリメートル
外径 3 ミリメートル
1 ミリメートル
材料 304 ステンレススチール
種類 Open
Precision Grade P0 / P6 Available
Clearance C0 / C2 Optional
Cage Material ステンレススチール
Max Speed まで 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

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 ミニチュアベアリング?

✅ 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)

  • カスタマイズされたパッケージ

✅ Stable Global Supply

Reliable exporter of 681 miniature bearings 1x3x1mm.