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67 Series
Home Deep Groove Ball Bearings 67 Series

6708-2RS Sealed Deep Groove Ball Bearing For Compact Applications | 40×50×6 Mm

6708-2RS Sealed Deep Groove Ball Bearing For Compact Applications | 40×50×6 Mm

The 6708-2RS is an Extra-Thin, Double Rubber-Sealed Deep Groove Ball Bearing designed for applications where space is at an absolute premium. Featuring a unique extremely slim cross-section (6 mm width) and a relatively large 40 mm bore, this bearing provides a compact rolling solution for mechanisms requiring low frictional torque and reliable sealing. Equipped with two contact rubber seals (2RS) , it provides superior protection against moisture and fine contaminants, ensuring long-term, maintenance-free operation in precision instruments and light-duty systems.

6708-2RS Deep Groove Ball Bearing 40×50×6 mm | ISO 6700 Series | Double Shielded

Engineered specifically for thin-section applications, this sealed bearing utilizes a miniature deep groove geometry to handle light radial and axial loads in both directions. It is optimized for speeds up to 6,500 r/min (Grease), offering a durable solution for equipment where shaft rigidity is required but housing space is constrained.

6708-2RS Sealed Deep Groove Ball Bearing For Compact Applications | 40×50×6 Mm

Comprehensive Applications

Suited for precision instruments and space-constrained rotating components requiring sealed-for-life performance:

Robotics & Automation
  • Small Robotic Joints and End Effectors
  • Stepper Motor and Servo Motor Assemblies
  • Automated Guided Vehicle (AGV) Wheels
  • Linear Actuator Lead Screw Supports
Medical & Laboratory Equipment
  • Centrifuges and Blood Analysis Machines
  • Dental Handpiece Components
  • Microtome and Lab Stirrer Mechanisms
  • Ventilator Blower Systems
Industrial & Precision Drives
  • Encoder and Resolver Bearings
  • Small DC Motor Armatures
  • Textile Spindle Tension Pulleys
  • Print and Labeling Machine Rollers
Office & Consumer Applications
  • High-Speed Printer and Copier Rollers
  • Hard Drive Spindle Motors (Legacy/Industrial)
  • Small Cooling Fan Modules
  • Optical Scanning Equipment

Key Performance Features

01. Ultra-Thin, Lightweight Profile

Manufactured from high-purity chrome steel (GCr15), this bearing features a 6 mm width while maintaining a large 40 mm inner diameter. This "thin-section" design allows for significant downsizing of housings and shafts without compromising rotational stability.

02. Maintenance-Free Operation

The double rubber seals (2RS) are manufactured from synthetic rubber (NBR) and lightly contact the inner ring. This provides a labyrinth-like barrier that permanently retains the factory-applied grease while preventing ingress of dust and moisture, effectively creating a "lubricated for life" component.

03. Smooth, Low-Noise Performance

The miniature balls and precision-ground raceways are manufactured to strict vibration standards. This ensures exceptionally quiet operation and low vibration levels, which is critical for medical and office automation equipment where noise pollution is a primary concern.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 6700 Series – Extra Thin Section
Basic Designation 6708
Suffix 2RS (Double Contact Rubber Seals)
Bore Diameter (d) 40 mm
Outer Diameter (D) 50 mm
Width (B) 6 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard / P5 Grade Available
Cage Material Pressed Steel or Polyamide (depending on version)
Dynamic Load Rating (Cʳ) 4.36 kN
Static Load Rating (C₀ʳ) 4.05 kN
Limiting Speed (Grease) 4,300 r/min
Limiting Speed (Oil) 5,000 r/min
Weight (approx.) 0.028 kg

Interchange Part Numbers

Common manufacturer equivalents include:

  • SKF: 6708-2RS
  • NSK: 6708VV
  • FAG: 6708-2RS
  • NTN: 6708LLU
  • KOYO: 6708-2RS / 6708-2RSE
  • TIMKEN: 6708-2RS
  • MRC: 6708-2RS

Design & Configuration

The 6708-2RS comes standard with double rubber seals, making it the preferred choice for applications requiring "fit and forget" reliability in environments with fine dust or incidental moisture exposure. For applications requiring the absolute lowest possible torque, a metal-shielded version (6708-ZZ) is available as an alternative, though it offers less contaminant resistance.

"Where space is the constraint and reliability is the requirement, the 6708-2RS delivers precision performance in an ultra-compact form factor, ideal for medical, automation, and light industrial drives."

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Request a Quote for Ball Bearings

Request a Quote for Ball Bearings
Please submit your inquiry below for detailed product and pricing information. We will get back to you within 24 hours.
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