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R3, R3Z, R3ZZ, R3RS, R3-2RS Inch Deep Groove Ball Bearings 3/16"x1/2"x10/51" (4.762x12.7x4.978mm) – Ultra-Miniature Sealed Bearings for Precision Instruments, Small Motors, Medical Devices & RC Models
Needle Bearing for Printing Machines
R3, R3Z, R3ZZ, R3RS, R3-2RS Inch Deep Groove Ball Bearings 3/16"x1/2"x10/51" (4.762x12.7x4.978mm) – Ultra-Miniature Sealed Bearings for Precision Instruments, Small Motors, Medical Devices & RC Models

R3, R3Z, R3ZZ, R3RS, R3-2RS Inch Deep Groove Ball Bearings 3/16"x1/2"x10/51" (4.762x12.7x4.978mm) – Ultra-Miniature Sealed Bearings for Precision Instruments, Small Motors, Medical Devices & RC Models

R3, R3Z, R3ZZ, R3RS, R3-2RS Inch Deep Groove Ball Bearings 3/16"x1/2"x10/51" (4.762x12.7x4.978mm) – Ultra-Miniature Sealed Bearings for Precision Instruments, Small Motors, Medical Devices & RC Models
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R3, R3Z, R3ZZ, R3RS, R3-2RS Inch Deep Groove Ball Bearings 3/16"x1/2"x10/51" (4.762x12.7x4.978mm) – Ultra-Miniature Sealed Bearings for Precision Instruments, Small Motors, Medical Devices & RC Models


The R3 series inch ultra-miniature deep groove ball bearings feature compact dimensions of 3/16"x1/2"x10/51" (4.762x12.7x4.978mm) , making them one of the smallest standard inch-series bearings—ideal for extreme space-constrained applications in precision instruments, micro motors, medical tools, dental equipment, watchmaking devices, and miniature RC models.
Available in multiple sealing configurations to suit your environment:
  • R3: Open type – minimal friction, ideal for clean or oil-lubricated systems
  • R3Z / R3ZZ: Single or double metal shields – reduce dust ingress while retaining factory grease
  • R3RS / R3-2RS: Single or double rubber seals – provide superior protection against fine dust, moisture, and contaminants
Manufactured from high-quality chrome steel (SAE 52100) with precision grinding for smooth, quiet rotation and extended service life. Stainless steel (440C) versions are available upon request for corrosion resistance or sterile environments.
Despite their tiny size, R3 bearings support light radial and axial loads, perfect for low-speed, high-precision applications where reliability and miniaturization are critical.
🔧 Key Specifications:
  • Models: R3, R3Z, R3ZZ, R3RS, R3-2RS
  • Dimensions: 3/16"x1/2"x10/51" (4.762x12.7x4.978mm) 
  • Material: Chrome Steel (standard); Stainless Steel optional
  • Type: Inch series ultra-miniature deep groove ball bearing
  • Ideal for: Lab instruments, micro motors, medical/dental tools, robotics, hobby models
⚠️ Tip: Use R3-2RS for humid or dusty conditions; R3ZZ for dry environments; open R3 for custom lubrication or ultra-low torque needs.
Each bearing undergoes strict quality inspection and is packed in anti-rust packaging. Available in single units or bulk—contact us for OEM or wholesale orders!


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