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62 Series
Home Deep Groove Ball Bearings 62 Series

6211-ZZ Shielded Deep Groove Ball Bearing for High-Speed Protection | 55x100x21 mm

6211-ZZ Shielded Deep Groove Ball Bearing for High-Speed Protection | 55x100x21 mm

The 6211-ZZ is a high-precision, single-row deep groove ball bearing equipped with dual non-contact metal shields. This design is engineered for applications requiring high-speed rotation and basic protection against larger particles and dust without the friction associated with rubber seals. Featuring a 55 mm bore, a 100 mm outer diameter, and a 21 mm width, the 6211-ZZ offers a reliable, low-maintenance solution for electric motors and power transmission systems where heat dissipation and high RPMs are essential.

6211-ZZ Deep Groove Ball Bearing 55×100×21 mm | 62 Series – Medium Duty | Double Metal Shielded

Designed with standard deep groove raceways for quiet and vibration-free performance, the 6211-ZZ is pre-greased and "shielded for life." Because the metal shields do not touch the inner ring, this bearing maintains a high limiting speed (6,700 r/min in oil) while providing a barrier that prevents grease leakage and keeps out external debris. It is the perfect middle ground for engineers needing the speed of an open bearing with the convenience of a lubricated-for-life unit.

 

6211-ZZ Shielded Deep Groove Ball Bearing for High-Speed Protection | 55x100x21 mm

Comprehensive Applications

Optimized for high-speed mechanical environments that require a balance of protection and low-torque performance:

Workshop & Power Tools
  • Bench Grinders and Lathes
  • Stationary Woodworking Machinery
  • Heavy-Duty Electric Drills
Motors & Power Generation
  • Medium-Sized Electric Motors
  • Pumps and Cooling Fans
  • Alternators and Starters
Agricultural & Landscaping Equipment
  • Lawn Mower Spindles
  • Drive Shafts for Farming Implements
  • Seed Drill Mechanisms
Industrial Conveyors
  • Roller Bearings for High-Speed Sorting Lines
  • Automated Logistics Equipment
  • Rotary Encoders

Key Performance Features

01. Low Friction Shielding

The ZZ designation indicates two non-contact steel shields. These shields offer a physical barrier to contaminants while allowing the bearing to run at higher speeds than rubber-sealed (2RS) variants by generating almost zero additional heat.

02. Factory-Sealed Lubrication

Each 6211-ZZ is filled with high-grade lubricant during manufacturing. The metal shields help retain this grease under high-speed centrifugal forces, ensuring the bearing remains operational for long cycles without needing intervention.

03. Optimized Chrome Steel Construction

Forged from premium GCr15 high-carbon chrome steel, this bearing undergoes precision grinding and heat treatment to achieve high fatigue strength and dimensional stability under varying temperature loads.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 62 Series – Medium Duty
Basic Designation 6211
Suffix ZZ (Double Metal Shields)
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) 5,600 r/min
Limiting Speed (Oil) 6,700 r/min
Weight (approx.) 0.61 kg

Interchange Part Numbers

For easy cross-referencing with other major manufacturers:

  • SKF: 6211-2Z
  • NSK: 6211 ZZ
  • FAG: 6211-2Z
  • NTN: 6211 ZZ
  • KOYO: 6211 ZZ
  • Timken: 6211-ZZ

Design & Configuration

The 6211-ZZ features two pressed-steel shields that are permanently fixed to the outer ring and extend toward the inner ring. While not airtight, they provide excellent grease retention and protection against coarse debris. For applications involving high-pressure water or fine grit, we recommend our 6211-2RS rubber-sealed variant.

"A versatile, high-speed performer that combines the convenience of pre-lubrication with the low-friction advantages of a shielded design."

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