• Dental Drill & Handpiece Turbines
• Micro-Surgical Tools & Robotics
• Precision Fluid Metering Pumps
• Laboratory Centrifuge Rotors

• Micro-Servo Motors & Encoders
• Small Cooling Fans & Blowers
• Precision Stepper Motor Rotors
• Cordless Tool Armatures

• Miniature Linear Actuators
• Robotic Finger Joints
• Optical Lens Grinding Machinery
• Pick-and-Place Machine Pulleys

• 3D Printer Extruder Wheels
• High-Precision Flow Meters
• Radio-Controlled (RC) Model Gearboxes

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. 

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."