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MR Series
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MR85-2RS Miniature Deep Groove Ball Bearing For Precision Electronics | Dual Rubber Sealed | 5×8×2.5 mm

MR85-2RS Miniature Deep Groove Ball Bearing For Precision Electronics | Dual Rubber Sealed | 5×8×2.5 mm

The MR85-2RS is a high-performance, single-row miniature bearing specifically developed for engineering designs that prioritize moisture resistance and space optimization. Featuring dual synthetic rubber contact seals (2RS) on a slim 5x8x2.5 mm frame, this component offers a fortified barrier against liquid ingress and fine particulates. Its ultra-compact geometry is ideal for micro-actuators, waterproof servos, and portable consumer electronics, ensuring that the internal precision raceways remain shielded and the lubricant is retained even in high-vibration environments.

MR85-2RS Deep Groove Ball Bearing 5x8x2.5 mm | MR Series – Enhanced Environmental Protection

Designed to bridge the gap between high-speed agility and rugged environmental sealing, this sealed micro-bearing thrives where exposure to dust or humidity is constant. The MR85-2RS utilizes high-quality NBR rubber seals that maintain light contact with the inner ring, effectively excluding contaminants while supporting steady rotational speeds up to 53,000 r/min under grease lubrication. It provides a whisper-quiet, low-friction solution for delicate micro-mechanics, delivering consistent torque and an extended service life.

MR85-2RS Miniature Deep Groove Ball Bearing For Precision Electronics | Dual Rubber Sealed | 5×8×2.5 mm

Comprehensive Applications

Engineered for micro-clearance environments requiring robust sealing and high-grade materials:

Micro-Robotics & RC Equipment
  • High-Torque Miniature Waterproof Servos
  • RC Car Steering Bellcranks and Hubs
  • Small-Scale Gimbal Stabilization Motors
  • Underwater Exploration Micro-Drones
Portable Medical Devices
  • Handheld Diagnostic Equipment
  • Micro-Fluidic Pump Assemblies
  • Portable Dental Imaging Hardware
  • Wearable Health Monitoring Mechanisms
Precision Home & Office Tech
  • High-End Cooling Fans for Compact Servers
  • Smart Home Camera Rotation Bases
  • Automated Window Blind Motors
  • Precision Gears in High-Resolution Printers
Outdoor & Sensing Hardware
  • Automated Weather Station Anemometers
  • Compact Laser Distance Meters
  • Ruggedized Outdoor Security Sensors
  • Miniature Valve Actuators

Key Performance Features

01. Dual-Contact Rubber Sealing (2RS)

Equipped with premium synthetic rubber seals on both sides, the MR85-2RS provides the highest level of protection in the MR series. This sealing technology is designed to prevent the entry of liquids and fine dust, making it the premier choice for outdoor hardware or devices used in non-sterile industrial settings.

02. Industrial-Grade GCr15 Chrome Steel

Both the rings and the rolling elements are manufactured from high-carbon GCr15 Chrome Steel. Through a specialized vacuum-degassing and hardening process, the bearing achieves a high-hardness surface that resists surface fatigue and wear, maintaining P5/P6 precision grades even under continuous operation.

03. 5mm Bore for Versatile Scaling

With a 5mm bore diameter, the MR85-2RS supports a wide variety of micro-shafts. Its 2.5mm narrow width and total weight of approximately 0.44 grams make it a critical component for battery-powered, weight-sensitive devices where every milligram impacts performance.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series MR Series (Miniature Metric)
Basic Designation MR85
Suffix 2RS (Double Rubber Contact Seals)
Bore Diameter (d) 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
Seal Material Nitrile Butadiene Rubber (NBR)
Dynamic Load Rating (Cʳ) 0.218 kN (218 N)
Static Load Rating (C₀ʳ) 0.089 kN (89 N)
Limiting Speed (Grease) 53,000 r/min
Limiting Speed (Oil) 63,000 r/min (Seals removed)
Weight (approx.) 0.00044 kg (0.44 grams)

Interchange Part Numbers

Cross-reference equivalents for technical procurement include:

  • SKF: MR85-2RS1
  • NMBL-850LL
  • NSK: MR85 DDU
  • NTN: MR85 LLU
  • FAG: MR85-2RSR
  • KOYO: MR85-2RS

Design & Configuration

Configured with dual rubber seals, the MR85-2RS is the definitive choice for engineers seeking maintenance-free operation and high resistance to external contamination. While the contact seals prioritize protection, they are engineered to minimize friction in high-RPM micro-motors. With over 15 years of technical manufacturing expertise, Welink Bearing offers custom clearance (C3) and specialty lubrication options to meet the unique torque and temperature profiles of your industrial application.

"Integrate the MR85-2RS sealed miniature bearing to ensure maximum environmental reliability, excellent grease retention, and consistent precision in your most compact mechanical designs."

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