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69 Series
Home Deep Groove Ball Bearings 69 Series

6908-2RS Sealed Deep Groove Ball Bearing for Thin-Section Applications & Precision Drives | 40×62×12 Mm

6908-2RS Sealed Deep Groove Ball Bearing for Thin-Section Applications & Precision Drives | 40×62×12 Mm

The 6908-2RS is a Double Rubber-Sealed Extra-Light Series Deep Groove Ball Bearing engineered for applications demanding minimal cross-section with reliable contamination protection. Featuring two rubber contact seals (2RS) on both sides, it effectively shields against dust, moisture, and fine particles while preserving internal lubrication. With a 40 mm bore and a slim 12 mm width, this bearing is an excellent choice for compact machinery, precision instruments, and light-duty drive systems where sealing integrity and space efficiency are equally important .

6908-2RS Deep Groove Ball Bearing 40×62×12 mm | ISO 69 Series – Extra Light | Double Rubber Sealed

Built on a thin-section deep groove geometry, this sealed bearing delivers quiet and stable performance at speeds up to 11,000 r/min (Grease). It accommodates light to moderate radial loads and limited axial loads, making it particularly suitable for applications in automation equipment, medical devices, and industrial robotics where environmental resistance and extended service life are required in confined spaces .

6908-2RS Sealed Deep Groove Ball Bearing for Thin-Section Applications & Precision Drives | 40×62×12 Mm

Comprehensive Applications

Ideal for compact and precision-oriented designs across multiple sectors where sealing reliability and minimal cross-section are critical:

Automation & Robotics
  • Industrial Robot Arms and Actuators
  • Rotary Encoders and Positioning Systems
  • Laser Engravers and CNC Auxiliary Equipment 
Medical & Laboratory Equipment
  • Medical Instrumentation Drives
  • Dental Handpieces and Surgical Tools
  • Laboratory Centrifuges and Analytical Devices 
Electric Motors & Precision Drives
  • Stepping Motors and Servo Motors
  • Miniature Pump and Compressor Motors
  • Cooling Fans in Electronics and IT Equipment 
Optical & Imaging Systems
  • Camera and Optical Equipment Mechanisms
  • Scanner and Printer Precision Components
  • Surveillance and Imaging Device Drives

Key Performance Features

01. Ultra-Thin & Space-Saving Profile

With dimensions of 40×62×12mm, this extra-light series bearing features minimized ring cross-sections, making it ideal for applications with strict radial space limitations while maintaining reliable load support.

02. Smooth & Low-Vibration Operation

Precision-engineered chrome steel raceways and balls, combined with optimized internal clearance, ensure quiet running with minimal vibration across various operating speeds.

03. Effective Dual Rubber Sealing

Integrated rubber contact seals on both sides provide dependable protection against contaminants and moisture, significantly extending bearing life in challenging or dirty environments.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 69 Series – Extra Light
Basic Designation 6908
Suffix 2RS (Double Rubber Contact Seals)
Bore Diameter (d) 40 mm
Outer Diameter (D) 62 mm
Width (B) 12 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard (P0 / ABEC 1); P5/P6 Grades Available
Cage Material Stamped Steel
Dynamic Load Rating (Cʳ) 12.2 kN
Static Load Rating (C₀ʳ) 8.9 kN 
Limiting Speed (Grease) 11,000 r/min 
Limiting Speed (Oil)
Weight (approx.) 110 g

Interchange Part Numbers

Common manufacturer equivalents include:

  • SKF: 61908-2RS 
  • NSK: 6908DDU
  • FAG: 6908-2RSR
  • NTN: 6908LLU
  • KOYO: 6908LLB
  • Timken: 6908-2RS

Design & Configuration

The 6908-2RS features double rubber contact seals, making it well-suited for environments exposed to light contaminants and humidity. For applications requiring even higher speeds or different sealing options, the double shielded variant (6908-ZZ) or open version (6908) may be considered as alternatives.

"A preferred choice for compact motor designs, precision automation, and medical devices, the 6908-2RS delivers effective sealing and dependable performance where space constraints and protection requirements are equally demanding."

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