• High-Torque Dental Micromotors
• Surgical Saw Oscillating Mechanisms
• Laboratory Mixer Rotors
• Micro-Dialysis Pump Systems

• Miniature Grinding Spindles
• PCB Drilling Spindle Supports
• Small Diameter Routing Tools
• Precision Winding Machinery

• Rotating Mirror Assemblies
• Barcode Scanner Mechanisms
• Laser Marking Galvanometers
• Optical Encoder Rotors

• Small Conveyor Roller Ends
• Pneumatic Tool Rotors
• Miniature Indexing Tables
• Precision Tensioning Devices

01. High-Speed Optimized Shield Configuration

The 671-ZZ incorporates non-contact metal shields that maintain a controlled clearance between shield and inner ring land surfaces. This precision-engineered gap prevents lubricant egress while eliminating seal drag, allowing the bearing to achieve rotational speeds approaching those of open configurations. The result is extended high-speed capability without the torque penalties associated with contact sealing elements.

02. Lubrication Retention with Minimal Interference

Factory-packed premium grease is effectively retained by the double shield arrangement, ensuring consistent lubrication throughout the operational life of the bearing. The labyrinth-style protection provided by the shields reduces lubricant migration while preventing ingress of larger particles that could otherwise accelerate raceway and ball wear in high-RPM applications.

03. Balanced Protection for Compact Environments

While not offering the hermetic sealing of contact rubber seals, the 671-ZZ provides adequate protection for the majority of controlled-environment precision mechanisms. The reduced frictional characteristics make this configuration particularly advantageous in battery-powered instruments and torque-sensitive assemblies where every increment of rotational resistance affects overall system efficiency.

Interchange Part Numbers

Direct replacement and cross-reference for industry standard double shielded miniature bearing part numbers:

• SKF: 671-2Z
• NSK: 671ZZ
• FAG: 671.2Z
• NTN: 671ZZ
• KOYO: 671ZZ
• TIMKEN: 671ZZ
• MRC: 671ZZ

Design & Configuration

The 671-ZZ platform offers several configuration possibilities to address specific application requirements:

• Standard 671-ZZ: Double non-contact metal shields with premium grease lubrication for general high-speed instrumentation and precision drive applications requiring balanced protection and minimal torque.

• Stainless Steel 671-ZZ (440C): Corrosion-resistant variant for medical device applications, laboratory equipment, or environments with elevated humidity exposure.

• Increased Clearance (C3): Accommodates thermal expansion differentials in applications with dissimilar housing materials or elevated operating temperatures.

• High-Speed Grease Variant: Special low-viscosity lubricant formulation for applications pushing the upper speed limits of shielded miniature bearing configurations.

• P6 Precision Grade: Enhanced geometric accuracy for applications requiring minimal runout, such as optical scanning mechanisms and precision encoder systems.

"For high-speed dental micromotors, precision spindle assemblies, and optical scanning equipment requiring extended lubrication life without rotational drag, the 671-ZZ delivers reliable performance in the smallest available footprint. Select stainless steel specification for applications requiring enhanced corrosion resistance or regular sterilization exposure."