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68 Series
Home Deep Groove Ball Bearings 68 Series

681-ZZ Ultra-Miniature Shielded Ball Bearing for High-Speed Precision | 1×3×1 mm

681-ZZ Ultra-Miniature Shielded Ball Bearing for High-Speed Precision | 1×3×1 mm

The 681-ZZ is a high-precision, dual-shielded miniature deep groove ball bearing designed for microscopic mechanical assemblies where high rotational velocity and low frictional torque are critical. With an incredibly small 1 mm bore and 3 mm outer diameter, this component provides stable support in ultra-compact environments. Featuring two non-contact metal shields (ZZ), it offers excellent protection against larger debris while retaining factory-grade lubrication, making it the premier choice for high-speed micro-motors and sensitive optical devices.

681-ZZ Deep Groove Ball Bearing 1×3×1 mm | 6800 Ultra-Small Series | Double Metal Shielded

Optimized for high-frequency performance, this shielded bearing is engineered with precision-honed raceways to minimize heat generation during rapid rotation. Unlike sealed versions, the metal shields allow for significantly higher operating speeds, reaching up to 100,000 r/min with grease, while maintaining a low-drag profile. It is a robust, space-saving solution for precision hardware where housing volume is extremely limited but high-speed reliability is non-negotiable.

681-ZZ Ultra-Miniature Shielded Ball Bearing for High-Speed Precision | 1×3×1 mm

Comprehensive Applications

Ideally suited for micro-scale rotating assemblies and precision-engineered devices requiring low-friction, high-speed performance:

Micro-Medical Technology
  • High-Speed Dental Handpiece Turbines
  • Minimally Invasive Surgical Micro-Tools
  • Portable Medical Diagnostic Equipment
  • Ophthalmic Laser Positioning Units
Precision Laboratory Instruments
  • Optical Scanning Mirror Assemblies
  • Centrifuge Rotor Micro-Pivots
  • Laboratory Micro-Pump Drive Shafts
  • Automated Liquid Handling Sensors
Miniature Motor & Fan Systems
  • High-RPM Brushless DC (BLDC) Motors
  • Ultra-Quiet Cooling Micro-Fans
  • Drone Gimbal Brushless Actuators
  • Miniature Stepper Motor Components
High-End Consumer Electronics
  • Smartwatch Internal Gear Mechanisms
  • Compact Camera Lens Focusing Drives
  • Professional Stylus Pen Internal Pivot
  • Portable Micro-Audio Interface Dials

Key Performance Features

01. Low-Friction Metal Shielding

Equipped with dual non-contact steel shields (ZZ), this bearing is designed to keep out contaminants without the friction associated with rubber seals. This configuration allows for the highest possible rotational speeds and lowest starting torque, ensuring smooth startup in low-power micro-applications.

02. Precision Micro-Architecture

Crafted from premium high-carbon chrome steel (GCr15), the 681-ZZ maintains a microscopic 1 mm width. This ultra-thin profile enables engineers to design lighter, smaller, and more efficient mechanical systems without compromising on the axial stability of the rotating shaft.

03. Exceptional High-Speed Stability

Every component is manufactured to strict P5 precision tolerances and V-Class vibration standards. The precision-balanced balls and refined raceways ensure that the bearing operates with minimal noise and thermal expansion, even when reaching speeds exceeding 90,000 RPM.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 6800 Series – Ultra-Miniature
Basic Designation 681
Suffix ZZ (Double Metal Shields)
Bore Diameter (d) 1 mm
Outer Diameter (D) 3 mm
Width (B) 1 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard (P0) / P6 or P5 Available Upon Request
Cage Material Pressed Stainless Steel Crown Cage
Dynamic Load Rating (Cʳ) 0.08 kN
Static Load Rating (C₀ʳ) 0.025 kN
Limiting Speed (Grease) 100,000 r/min
Limiting Speed (Oil) 130,000 r/min
Weight (approx.) 0.03 g

Interchange Part Numbers

Common industry equivalents for global sourcing:

  • SKF: 681-2Z
  • NSK: 681ZZ
  • NTN: 681ZZ
  • KOYO: 681ZZ
  • NMB: L-310ZZ

Design & Configuration

The 681-ZZ is the industry standard for high-performance micro-mechanics where operational speed takes precedence over heavy environmental sealing. The metal shields provide a durable barrier against dust in relatively clean laboratory or electronic environments while allowing the bearing to spin freely with negligible resistance.

For specialized medical or aerospace needs, this model is also available in a stainless steel variant (S681-ZZ) to provide superior resistance to corrosion and oxidation. For applications requiring maximum sealing against fine powders or liquids, the contact-sealed version (681-2RS) is the recommended alternative.

"When your project demands the ultimate balance between microscopic size and high-velocity performance, the 681-ZZ delivers unrivaled precision for the world's most delicate mechanical systems."

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Request a Quote for Ball Bearings

Request a Quote for Ball Bearings
Please submit your inquiry below for detailed product and pricing information. We will get back to you within 24 hours.
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