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R166, R166Z, R166ZZ, R166RS, R166-2RS Inch Miniature Deep Groove Ball Bearings 3/16"​x3/8"​x1/8" (4.763x9.525x3.175mm) – Sealed Bearings for Small Motors, Power Tools, Printers, RC Models & Precision
Needle Bearing for Printing Machines
R166, R166Z, R166ZZ, R166RS, R166-2RS Inch Miniature Deep Groove Ball Bearings 3/16"​x3/8"​x1/8" (4.763x9.525x3.175mm) – Sealed Bearings for Small Motors, Power Tools, Printers, RC Models & Precision

R166, R166Z, R166ZZ, R166RS, R166-2RS Inch Miniature Deep Groove Ball Bearings 3/16"​x3/8"​x1/8" (4.763x9.525x3.175mm) – Sealed Bearings for Small Motors, Power Tools, Printers, RC Models & Precision

R166, R166Z, R166ZZ, R166RS, R166-2RS Inch Miniature Deep Groove Ball Bearings 3/16"​x3/8"​x1/8" (4.763x9.525x3.175mm) – Sealed Bearings for Small Motors, Power Tools, Printers, RC Models & Precision Machinery
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R166, R166Z, R166ZZ, R166RS, R166-2RS Inch Miniature Deep Groove Ball Bearings 3/16"x3/8"x1/8" (4.763x9.525x3.175mm) – Sealed Bearings for Small Motors, Power Tools, Printers, RC Models & Precision Machinery


The R166 series inch miniature deep groove ball bearings feature standard dimensions of 3/16"x3/8"x1/8" (4.763x9.525x3.175mm) , offering a robust balance of load capacity and compact design—ideal for small electric motors, power tools, printers, scanners, RC vehicles, drones, and precision mechanical devices.
Available in multiple sealing configurations to suit your operating environment:
  • R166: Open type – minimal friction, ideal for clean or oil-lubricated systems
  • R166Z / R166ZZ: Single or double metal shields – reduce dust ingress while retaining factory grease
  • R166RS / R166-2RS: Single or double rubber seals – provide excellent protection against moisture, dust, and fine contaminants
Manufactured from high-quality chrome steel (SAE 52100) with precision grinding for smooth, quiet operation and extended service life. Stainless steel (440C) versions are available upon request for corrosive or hygiene-sensitive applications.
These bearings support both radial and moderate axial loads, making them suitable for low-to-medium speed applications where reliability and space efficiency are critical.
🔧 Key Specifications:
  • Models: R166, R166Z, R166ZZ, R166RS, R166-2RS
  • Dimensions: 3/16"x3/8"x1/8" (4.763x9.525x3.175mm) 
  • Material: Chrome Steel (standard); Stainless Steel optional
  • Type: Inch miniature deep groove ball bearing
  • Ideal for: Electric hand tools, model engines, office automation, small gearboxes, dental equipment
⚠️ Note: This is the R166 series (not R166). Always verify shaft and housing fit before installation.

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