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62 Series
Home Deep Groove Ball Bearings 62 Series

6211 Open Single Row Deep Groove Ball Bearing for High-Speed Performance | 55x100x21 mm

6211 Open Single Row Deep Groove Ball Bearing for High-Speed Performance | 55x100x21 mm

The 6211 Open is a high-performance, single-row radial ball bearing engineered for systems that require maximum rotational speed and minimal internal friction. Without the restriction of seals or shields, this bearing allows for the free flow of external lubricants, making it the ideal choice for enclosed gearboxes and oil-circulating systems. With a 55 mm bore and a precision-ground 100 mm outer diameter, the 6211 provides a stable, low-torque solution for industrial machinery where heat dissipation is a primary concern.

6211 Deep Groove Ball Bearing 55×100×21 mm | 62 Series – Medium Duty | Open Type

Designed with an optimized raceway for smooth operation, the 6211 Open type supports both significant radial loads and moderate axial loads in both directions. Because it lacks contact friction from seals, it can reach impressive operational speeds—up to 7,500 r/min when used with oil lubrication. This bearing is preferred for high-duty cycles where the environment is already protected by an external housing or casing.

 

6211 Open Single Row Deep Groove Ball Bearing for High-Speed Performance | 55x100x21 mm

Comprehensive Applications

Perfectly suited for a wide range of high-velocity industrial and mechanical environments:

High-Speed Fluid Handling
  • Centrifugal Pumps and Turbines
  • Industrial Blowers and Exhausters
  • High-Volume Air Compressors
Power Transmission & Gearboxes
  • Industrial Speed Reducers
  • Automotive Transmission Shafts
  • Helical and Spur Gear Units
Electric Motors & Generators
  • Large AC/DC Motor Shafts
  • Hydro and Wind Power Alternators
  • Stationary Power Plants
Manufacturing & Processing
  • Textile Machinery Spindles
  • Paper Mill Rollers
  • Automated Assembly Equipment

Key Performance Features

01. Exceptional High-Speed Capability

The open configuration is the "fastest" design in the 6211 series. By eliminating seal-drag, the bearing operates with lower friction, resulting in less heat buildup and a significantly higher RPM limit compared to shielded or sealed versions.

02. Precision Chrome Steel Engineering

Manufactured from premium-grade GCr15 (SAE 52100) chrome steel, the 6211 Open features a high-fatigue life and excellent dimensional stability. Its precision-honed raceways contribute to a low-vibration, quiet-running environment.

03. Optimal Lubricant Circulation

As an open bearing, it is designed to be used in systems where grease or oil is supplied externally. This allows for constant cooling and debris flushing, ensuring the internal rolling elements remain perfectly coated for long-term durability.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 62 Series – Medium Duty
Basic Designation 6211
Suffix Open (No Seal / No Shield)
Bore Diameter (d) 55 mm
Outer Diameter (D) 100 mm
Width (B) 21 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard / P5 Grade Available
Cage Material Pressed Steel (Standard)
Dynamic Load Rating (Cʳ) 43.6 kN
Static Load Rating (C₀ʳ) 29.0 kN
Limiting Speed (Grease) 6,300 r/min
Limiting Speed (Oil) 7,500 r/min
Weight (approx.) 0.61 kg

Interchange Part Numbers

Global manufacturer equivalents for direct replacement:

  • SKF: 6211
  • NSK: 6211
  • FAG: 6211
  • NTN: 6211
  • KOYO: 6211
  • Timken: 6211

Design & Configuration

The 6211 Open is supplied without integral seals, allowing for maximum flexibility in maintenance and lubrication strategies. It is specifically intended for use in clean, sealed environments (such as oil-tight housings) where the bearing is not exposed to external moisture or grit.

"A top-tier choice for high-speed industrial applications where low torque, rapid heat dissipation, and continuous oil lubrication are essential for peak performance."

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