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MR Series
Home Deep Groove Ball Bearings MR Series

MR82 Micro Deep Groove Ball Bearing For Clean Environments | Open Type | 2.5×8×2.5 mm

MR82 Micro Deep Groove Ball Bearing For Clean Environments | Open Type | 2.5×8×2.5 mm

Specifically engineered for enclosed, contamination-free environments, the MR82 is a premium open-type miniature ball bearing that prioritizes absolute minimal rotational resistance. By deliberately omitting external shields and rubber seals, this 2.5x8x2.5 mm component eliminates contact friction entirely. The result is an ultra-lightweight, 0.5-gram rotary solution that delivers extraordinary high-speed capabilities and exceptional thermal dissipation. It is the definitive choice for internal micro-mechanisms, precision optical instruments, and coreless motors where running accuracy and low starting torque are prioritized above all else.

MR82 Deep Groove Ball Bearing 2.5x8x2.5 mm | MR Metric Series – Zero Friction Architecture

Belonging to the highly versatile MR metric series, this unshielded micro-bearing thrives in systems where external lubrication—such as oil mist or oil bath circulating systems—is readily available. Without the drag of protective closures, the open MR82 can achieve staggering rotational speeds of up to 71,000 r/min when properly oil-lubricated. It provides technical procurement teams with a reliable, ultra-smooth foundation for sensitive instrumentation that operates within sterile or deeply enclosed housings.

MR82 Micro Deep Groove Ball Bearing For Clean Environments | Open Type | 2.5×8×2.5 mm

Comprehensive Applications

Tailored for highly integrated, internal mechanical assemblies where engineers demand uncompromised speed and zero rotational drag:

Precision Micro Motors
  • Coreless DC Motors
  • Internal Rotor Supports for Stepper Motors
  • High-Frequency Spindle Motors
  • Micro-Actuator Drive Systems
Medical & Laboratory Instrumentation
  • Centrifuge Drive Mechanisms
  • Automated Blood Analyzers
  • Micro-Pumps and Fluid Handling Devices
  • High-Precision Dental Tool Internals
Advanced Optics & Measuring
  • Gyroscopic Stabilization Platforms
  • Laser Scanning Unit Bearings
  • Precision Optical Encoders
  • Sensitive Anemometers and Surveying Gear

Key Performance Features

01. Zero-Friction Open Architecture

By utilizing an open design without seals or shields, the MR82 drastically reduces starting and running torque. This structural choice not only permits the highest possible operational speeds (up to 71,000 RPM with oil) but also allows for continuous visual inspection and effortless re-lubrication within enclosed industrial machinery.

02. High-Purity GCr15 Chrome Steel

Manufactured from premium high-carbon chromium bearing steel, the raceways and rolling elements are engineered to withstand rigorous operational stress. Strict heat treatment protocols ensure excellent surface hardness, resulting in a durable dynamic load capacity of 474 N and long-lasting resistance against metal fatigue.

03. Ultra-Compact 2.5mm Bore Profile

With an outer diameter of just 8mm and a width of 2.5mm, this bearing provides significant spatial and weight advantages. It allows designers of handheld devices, aerospace micro-components, and precision sensors to aggressively scale down their assemblies while maintaining rigid, highly accurate rotational guidance.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series MR Series (Metric Miniature)
Basic Designation MR82
Suffix None (Open Type)
Bore Diameter (d) 2.5 mm
Outer Diameter (D) 8 mm
Width (B) 2.5 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard / P5 Grade Available
Closure Type Open (No Shields or Seals)
Dynamic Load Rating (Cʳ) 0.474 kN (474 N)
Static Load Rating (C₀ʳ) 0.144 kN (144 N)
Limiting Speed (Grease) 60,000 r/min
Limiting Speed (Oil) 71,000 r/min
Weight (approx.) 0.0005 kg (0.5 grams)

Interchange Part Numbers

Common manufacturer equivalents utilized by technical buyers include:

  • SKF: MR 82
  • NSK: MR82
  • FAG: MR82
  • NTN: MR82
  • KOYO: MR82
  • MRC: L-825

Design & Configuration

The open MR82 bearing is the ultimate engineering solution for applications demanding maximum RPMs, frictionless rotation, and continuous external lubrication. Backed by Welink Bearing's more than 15 years of industry-leading manufacturing expertise, our deep groove ball bearings are produced to exact dimensional tolerances. Our technical support team is available to assist B2B clients in determining if an open, shielded, or sealed configuration is most appropriate for their specific operational environments and load requirements.

"Leverage the MR82 open miniature bearing to achieve frictionless acceleration, remarkable rotational speeds, and precise mechanical alignment in your most advanced internal assemblies."

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