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R Series
Home Deep Groove Ball Bearings R Series

R2-6-ZZ Shielded Deep Groove Ball Bearing | High-Stability Miniature Rotation | 3.175 × 9.525 × 3.967 mm

R2-6-ZZ Shielded Deep Groove Ball Bearing | High-Stability Miniature Rotation | 3.175 × 9.525 × 3.967 mm

The R2-6-ZZ is a high-performance miniature imperial ball bearing engineered for applications that require a balance of compact sizing and enhanced structural rigidity. Featuring dual metal shields (ZZ), this bearing is designed to retain high-speed lubricant while providing a robust physical barrier against larger contaminants and debris. With its 1/8-inch bore and a wider-profile 5/32-inch width, the R2-6-ZZ offers superior radial load support compared to ultra-slim variants, making it ideal for precision motors and mechanical drive systems.

R2-6-ZZ Deep Groove Ball Bearing 3.175 × 9.525 × 3.967 mm | R Series – Enhanced Load Capacity & Shielded Protection

Optimized for smooth rotational delivery, the R2-6-ZZ excels in precision assemblies where low friction and long-term durability are non-negotiable. The non-contact steel shields allow for high-velocity operation without the heat generation or torque drag associated with rubber seals. Whether integrated into an automated industrial sensor or a high-torque micro-motor, the R2-6-ZZ provides a whisper-quiet, stable interface that maximizes the operational lifespan of 1/8-inch shaft assemblies.

R2-6-ZZ Shielded Deep Groove Ball Bearing | High-Stability Miniature Rotation | 3.175 × 9.525 × 3.967 mm

Comprehensive Applications

Engineered for technical designers seeking a reliable, shielded rotational solution for 1/8-inch imperial systems:

Industrial Automation & Robotics
  • High-precision rotary encoders
  • Small-scale stepper motor assemblies
  • Robotic arm joint pivots
  • Automated textile machinery components
Laboratory & Medical Instrumentation
  • Precision fluid metering pumps
  • Blood chemistry analyzers
  • High-speed laboratory mixers
  • Medical imaging gimbal supports
Aerospace & High-End Hobbies
  • Miniature drone motor bearings
  • RC aircraft control surface linkages
  • Precision anemometers and weather vanes
  • Small-scale gyroscopic stabilizers

Key Performance Features

01. Dual-Shielded Steel Architecture (ZZ)

The R2-6-ZZ is equipped with two non-contact metal shields that are pressed into the outer ring. This design protects the internal ball complement from dust and debris while ensuring the factory-applied grease remains contained within the raceways. This "shielded" configuration is perfect for high-speed applications where minimal torque is required.

02. Premium GCr15 Chrome Steel Construction

Manufactured from high-carbon GCr15 Chrome Steel (SAE 52100), the races and balls are heat-treated and precision-ground to P5 grade standards. This ensures high fatigue strength and dimensional accuracy, allowing the bearing to withstand significant rotational forces without losing its precise tolerances.

03. Robust Imperial Profile

With a 3.175 mm (1/8") bore and a 9.525 mm (3/8") outer diameter, the R2-6-ZZ follows standardized imperial dimensions. Its 3.967 mm (5/32") width provides a larger surface area for the raceways compared to standard miniature series, allowing for higher dynamic and static load ratings in heavy-duty micro-mechanisms.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series R Series (Miniature Imperial / Inch)
Basic Designation R2-6 (R2.6)
Suffix Options ZZ (Dual Pressed Steel Shields)
Bore Diameter (d) 3.175 mm (1/8")
Outer Diameter (D) 9.525 mm (3/8")
Width (B) 3.967 mm (5/32")
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100) or Stainless Steel (AISI 440C)
Precision Class Standard / P5 Grade Available
Cage Material Pressed Steel or Polyamide
Dynamic Load Rating (Cʳ) 0.640 kN (640 N)
Static Load Rating (C₀ʳ) 0.225 kN (225 N)
Limiting Speed (Grease) 43,000 r/min
Limiting Speed (Oil) 51,000 r/min
Weight (approx.) 0.0015 kg (1.5 grams)

Interchange Part Numbers

Global cross-references for streamlined replacement and procurement:

  • NMB: RI-618ZZ
  • SKF: R2-6-2Z
  • FAGR2-6-2Z
  • NSK: R2-6ZZ
  • NTN: R2-6ZZ
  • Barden: R2-6SS
  • KOYO: R2-6ZZ

Design & Configuration

With over 15 years of industry leadership, Welink Bearing focuses on providing high-precision hardware that solves complex rotational challenges. The R2-6-ZZ is a staple for engineers who require a miniature bearing that doesn't compromise on load capacity. For high-volume industrial orders, we provide customized lubrication solutions—including low-starting-torque instrument oils or high-temperature synthetic greases—to ensure your micro-designs perform flawlessly under any condition.

"Achieve optimal rotational balance with the R2-6-ZZ bearing—engineered for shielded protection, imperial precision, and high-load reliability in your most demanding micro-mechanical designs.”

Download Product Catalog (PDF)

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