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67 Series
Home Deep Groove Ball Bearings 67 Series

676 Open Miniature Deep Groove Ball Bearing For Advanced Optics | Unshielded | 6×10×3 mm

676 Open Miniature Deep Groove Ball Bearing For Advanced Optics | Unshielded | 6×10×3 mm

Engineered for applications where absolute minimum rotational resistance is the primary objective, the 676 Open is a premium single-row miniature ball bearing. Featuring an unshielded (open) architecture, this 6x10x3 mm component offers zero contact friction from seals or shields, making it the ultimate choice for ultra-high-speed operations. Weighing just 1 gram, this micro-bearing is designed to be housed within sealed gearboxes, cleanrooms, or systems utilizing external oil-bath lubrication, ensuring peak mechanical efficiency without parasitic drag.

676 Deep Groove Ball Bearing 6x10x3 mm | 67 Series – Ultra-Thin | Maximum RPM

This open-type precision bearing guarantees the lowest possible starting and running torque within the 6700 series. By omitting protective closures, the 676 allows for direct, unrestricted lubricant flow (such as oil mist or oil bath), enabling it to safely reach exceptional speeds of up to 53,000 r/min. It serves as an indispensable core component for highly sensitive miniaturized mechanics where thermal dissipation and free-spinning capabilities outweigh the need for integrated dust protection.

676 Open Miniature Deep Groove Ball Bearing For Advanced Optics | Unshielded | 6×10×3 mm

Comprehensive Applications

Optimized for ultra-clean, high-speed, and severely space-restricted environments where external contamination is controlled:

Advanced Optics & Imaging
  • Internal Gimbal Mechanisms for LiDAR
  • Precision Camera Lens Focusing Rings
  • Micro-Telescope Mounts
  • High-Speed Rotating Mirrors
Miniaturized Medical & Laboratory Devices
  • Micro-Centrifuge Spindles
  • Automated Syringe Pump Drives
  • Precision Pipetting Mechanisms
  • Cleanroom Robotics Joints
High-Performance Micro-Mechanics
  • Sealed Micro Gearmotors
  • Precision Measuring Dials and Indicators
  • High-End Horology (Watchmaking) Tools
  • Gyroscopic Navigation Systems

Key Performance Features

01. Zero-Friction Open Architecture

By completely eliminating shields and seals, the 676 Open bearing removes all physical barriers that cause rotational drag. This allows for instantaneous acceleration and accommodates the highest possible RPMs in its size class, making it ideal for systems driven by extremely low-torque micro-motors.

02. Unrestricted Lubrication Access

The open design is specifically intended for environments that utilize external, continuous lubrication methods. Whether immersed in an oil bath or utilizing precision oil mist injection, the exposed rolling elements ensure rapid heat dissipation and continuous oil flushing for extended operational life.

03. Premium GCr15 Metallurgy

Forged from high-carbon chromium bearing steel (GCr15), both the rings and balls undergo rigorous heat-treatment processes. This ensures superior load-bearing hardness, exceptional wear resistance, and long-term dimensional stability despite the ultra-thin 3mm cross-section.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 6700 Series (Micro/Ultra-Thin Section)
Basic Designation 676
Suffix None (Open Type)
Bore Diameter (d) 6 mm
Outer Diameter (D) 10 mm
Width (B) 3 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard / P5 Grade Available
Shield Material Pressed Steel
Dynamic Load Rating (Cʳ) 0.465 kN (465 N)
Static Load Rating (C₀ʳ) 0.196 kN (196 N)
Limiting Speed (Grease) 45,000 r/min
Limiting Speed (Oil) 53,000 r/min
Weight (approx.) 0.001 kg (1 gram)

Interchange Part Numbers

Cross-reference designations for technical procurement:

  • SKF: 617/6
  • NSK: 676
  • FAG676
  • NTN: 676
  • KOYO: 676
  • NMB: L-1060

Design & Configuration

The 676 Open bearing is the definitive choice when your mechanical assembly operates in a controlled, contamination-free environment, or when the bearing is seated within a fully sealed housing. If your application risks exposure to airborne dust or moisture without secondary external sealing, please consult our technical catalog for the shielded (ZZ) or sealed (2RS) variants of this dimension.

"Specify the 676 Open bearing to achieve absolute minimum rotational torque, superior oil-lubricated speeds, and precise mechanical alignment in ultra-compact enclosures."

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Engineered for applications where absolute minimum rotational resistance is the primary objective, the 676 Open is a premium single-row miniature ball bearing. Featuring an unshielded (open) architecture, this 6x10x3 mm component offers zero contact friction from seals or shields, making it the ultimate choice for ultra-high-speed operations. Weighing just 1 gram, this micro-bearing is designed to be housed within sealed gearboxes, cleanrooms, or systems utilizing external oil-bath lubrication, ensuring peak mechanical efficiency without parasitic drag.

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The 672 Open is an elite-grade micro-miniature ball bearing designed for applications where spatial constraints are extreme and rotational mass must be kept to an absolute minimum. As an unshielded, open-type component, this 2×5×1.5 mm bearing provides a "zero-drag" environment, allowing for instantaneous acceleration and high-frequency oscillation. Weighing approximately 0.1 grams, the 672 is the preferred choice for high-precision laboratory instrumentation, micro-optics, and nano-robotics where the slightest mechanical resistance can compromise system accuracy.

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