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67 Series
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671 Miniature Deep Groove Ball Bearing | Ultra-Compact 1×2×1 Mm for Precision Instruments

671 Miniature Deep Groove Ball Bearing | Ultra-Compact 1×2×1 Mm for Precision Instruments

The 671 is an extra-small miniature deep groove ball bearing from the metric 6700 series, designed for applications where space is at an absolute premium and precise rotational motion is required. With its minute 1mm bore and ultra-compact 1x2x1 mm dimensions, this micro-bearing is engineered for low-torque, high-speed performance. Despite its size, it retains the classic deep groove design to handle light radial and bidirectional axial loads, making it the ideal choice for miniature motors, dental handpieces, small gears, and precision instrumentation where smooth operation and reliability are critical. 

671 Deep Groove Ball Bearing 1x2x1 mm | Metric Miniature Series | Thin-Section Design

A fundamental component in micro-mechanical engineering, this bearing utilizes the proven deep groove geometry scaled down to sub-miniature proportions. It ensures very high-speed capability and minimal frictional torque. Engineered for continuous operation at speeds reaching 130,000 r/min with grease lubrication . The 671 is manufactured to precise tolerances, making it a trusted component for high-end miniature drives and sensitive laboratory equipment.

671 Miniature Deep Groove Ball Bearing | Ultra-Compact 1×2×1 mm for Precision Instruments

Comprehensive Applications

This ultra-miniature bearing is ideally suited for a wide array of precision and light-load machinery:

Precision Medical & Dental Equipment
  • Dental Drill & Handpiece Turbines
  • Micro-Surgical Tools & Robotics
  • Precision Fluid Metering Pumps
  • Laboratory Centrifuge Rotors
Miniature Electric Motors & Drives
  • Micro-Servo Motors & Encoders
  • Small Cooling Fans & Blowers
  • Precision Stepper Motor Rotors
  • Cordless Tool Armatures
Automation & Robotics
  • Miniature Linear Actuators
  • Robotic Finger Joints
  • Optical Lens Grinding Machinery
  • Pick-and-Place Machine Pulleys
Instruments & Hobby Applications
  • 3D Printer Extruder Wheels
  • High-Precision Flow Meters
  • Radio-Controlled (RC) Model Gearboxes

Key Performance Features

01. Ultra-Smooth, Vibration-Free Rotation

Manufactured to ABEC-1 precision standards (with higher grades available), the 671 ensures consistent quality in a micro-package. The precision-ground raceway grooves and carefully selected micro-balls facilitate exceptionally stable rotation, contributing to efficient power transmission and minimal noise in sensitive instruments. 

02. High-Speed Capability & Low Torque

As a member of the thin-section miniature family, the 671 is designed for minimal centrifugal force and low frictional torque. Manufactured from high-purity chrome steel (GCr15/SAE 52100), its design ensures superior durability even in continuous high-RPM applications, guaranteeing an extended service life despite its compact form. 

03. Versatile Configurations for Delicate Environments

This variant is typically available as open for ultra-low friction, or with double metal shields (ZZ) or rubber seals (2RS) for protection in compact assemblies. As a standard metric size, the 671 platform can also be specified with increased clearance (C3) or in stainless steel (AISI 440C) for applications requiring corrosion resistance or higher thermal stability. 

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 67 Series
Basic Designation 671
Suffix Open
Bore Diameter (d) 1 mm
Outer Diameter (D) 2 mm
Width (B) 1 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard / P5 Grade Available
Cage Material Pressed Steel or Polyamide (depending on version)
Dynamic Load Rating (Cʳ) 88 - 95 N
Static Load Rating (C₀ʳ) 21 - 26 N
Limiting Speed (Grease) 130,000 r/min
Limiting Speed (Oil) 150,000 r/min
Weight (approx.) 0.03 g

Interchange Part Numbers

Direct replacement and cross-reference for industry standard part numbers:

  • SKF: 671
  • NSK: 671
  • FAG: 671
  • NTN: 671
  • KOYO: 671
  • TIMKEN: 671
  • MRC: 671

Design & Configuration

While the 671 open variant is supplied as standard for ultra-high-speed applications, the base design allows for customization to meet specific operational demands:

• Open (671): Standard configuration. Ideal for oil-lubricated systems or applications requiring the absolute lowest possible torque, such as in micro-turbines.

• Double Shielded (671 ZZ / 2Z): For applications where grease retention is needed and protection against large debris particles is required in compact, sealed-for-life assemblies.

• Double Sealed (671 2RS / 2RS1): For enhanced protection against moisture, dust, and fine contaminants in harsh environments like medical handpiece cleaning cycles.

• Increased Clearance (671 C3): Suitable for applications where slight temperature differentials between inner and outer rings might occur.

• Stainless Steel (671 SUS): Provides superior corrosion resistance for food-grade, medical, or marine applications.

"For precision medical tools, high-speed dental equipment, and miniature robotics, the 671 offers a robust and reliable bearing solution in the smallest of packages. Specify seal suffixes (2RS) or stainless steel material to perfectly match your operating environment."

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