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67 Series
Home Deep Groove Ball Bearings 67 Series

672 Open Micro Deep Groove Ball Bearing | Ultra-Miniature Precision Series | 2×5×1.5 mm

672 Open Micro Deep Groove Ball Bearing | Ultra-Miniature Precision Series | 2×5×1.5 mm

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.

672 Deep Groove Ball Bearing 2x5x1.5 mm | 67 Series – Extreme Scale & Zero Inertia

This ultra-thin section bearing is engineered to deliver flawless rotational motion in highly controlled environments. By eliminating internal seals and shields, the 672 Open allows for direct oil-mist or specialized micro-grease lubrication, enabling it to reach exceptional speeds of up to 90,000 r/min. It functions as a critical rotary pivot for micro-mechanisms, ensuring stable, vibration-free performance under light-duty radial loads while occupying a footprint smaller than a matchhead.

672 Open Micro Deep Groove Ball Bearing | Ultra-Miniature Precision Series | 2×5×1.5 mm

Comprehensive Applications

Specifically tailored for the frontier of micro-engineering and high-speed laboratory tech:

Medical & Laboratory Automation
  • Micro-Fluidic Pump Rotors
  • Precision Pipette Actuators
  • Miniature Surgical Robotics Articulations
  • High-Speed Blood Analysis Centrifuges
Micro-Optics & Measurement
  • Laser Scanning Mirrored Pivots
  • Nano-Positioning Stages
  • Micro-Anemometer Sensors
  • High-Resolution Optical Encoders
Micro-Electronics & Tech
  • Specialized Cooling Fans for Micro-Processors
  • Wearable Tech Gear Mechanisms
  • Handheld Precision Measurement Tools
  • Ultra-Miniature Brushless DC (BLDC) Motors

Key Performance Features

01. Low-Inertia Open Configuration

The 672 Open features a minimalist architecture with no physical closures. This design facilitates the lowest possible starting torque, which is essential for battery-powered micro-devices that require maximum energy efficiency and rapid speed adjustments.

02. High-Purity GCr15 Material Construction

Crafted from premium GCr15 Chrome Steel, the raceways and balls undergo specialized cryogenic heat treatment. This results in exceptional dimensional stability and surface hardness, ensuring the bearing maintains its precision grade even during continuous high-RPM operation.

03. Micro-Scale 1.5mm Profile

With a cross-section of only 1.5mm, this bearing allows technical designers to push the limits of miniaturization. Its high precision-to-size ratio provides a severe competitive advantage for manufacturers of portable medical diagnostic tools and next-generation wearable sensors.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 6700 Series (Micro/Ultra-Thin Section)
Basic Designation 672
Suffix None (Open Type)
Bore Diameter (d) 2 mm
Outer Diameter (D) 5 mm
Width (B) 1.5 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard / P5 Grade Available
Shield Material None
Dynamic Load Rating (Cʳ) 0.165 kN (165 N)
Static Load Rating (C₀ʳ) 0.045 kN (45 N)
Limiting Speed (Grease) 75,000 r/min
Limiting Speed (Oil) 90,000 r/min
Weight (approx.) 0.0001 kg (0.1 gram)

Interchange Part Numbers

Technical procurement teams can reference the following manufacturer equivalents:

  • SKF: 617/2
  • NSK: 672
  • FAG672
  • NTN: 672
  • KOYO: 672
  • NMB: L-520

Design & Configuration

The 672 Open is the definitive solution for high-speed micro-precision within protected, clean-room environments. Due to its unshielded nature, it is highly compatible with custom lubrication regimes tailored to specific vacuum or thermal requirements. Backed by over 15 years of manufacturing expertise, Welink Bearing’s technical team is available to assist in selecting the optimal tolerances and lubricants for your most delicate mechanical challenges.

"Incorporate the 672 Open micro-bearing to achieve unparalleled rotational agility and extreme space-savings in your high-precision designs."

 

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