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67 Series
Home Deep Groove Ball Bearings 67 Series

6711-ZZ High-Velocity Thin-Section Ball Bearing | Friction-Minimized Metric Series | 55×68×7 mm

6711-ZZ High-Velocity Thin-Section Ball Bearing | Friction-Minimized Metric Series | 55×68×7 mm

The 6711-ZZ is a specialized thin-section radial bearing engineered for high-speed rotation where space efficiency is a primary design requirement. Featuring dual non-contact metal shields (ZZ), this bearing provides a robust barrier against dust and debris while maintaining the lowest possible rotational friction. With a 55mm bore diameter and a slim 7mm width, it is the premier choice for large-diameter shafting in robotics, optical instruments, and precision automation where thermal buildup must be kept to a minimum.

6711-ZZ Deep Groove Ball Bearing 55x68x7 mm | 6700 Series | Double Metal Shields

A high-precision mechanical component optimized for rapid oscillation and consistent rotational accuracy. The 6711-ZZ belongs to the extra-thin metric series, allowing for significant weight reduction without sacrificing structural stiffness. The non-contact nature of the steel shields allows the bearing to reach significantly higher RPMs compared to sealed versions, making it ideal for precision spindles and high-frequency automated equipment. It effectively supports radial loads and moderate bidirectional axial loads within a highly compact envelope.

6711-ZZ High-Velocity Thin-Section Ball Bearing | Friction-Minimized Metric Series | 55×68×7 mm

Comprehensive Applications

The 6711-ZZ is integrated into advanced systems requiring high-speed stability and space-saving geometry:

Robotics & Mechatronic Assemblies
  • High-speed robotic arm swivels
  • Automated pick-and-place head rotations
  • Collaborative robot (Cobot) joint supports
  • Precision gear reduction system outputs
Optical & Precision Imaging Hardware
  • Large-format professional camera gimbals
  • Satellite communication dish rotators
  • Industrial laser scanning platforms
  • High-resolution astronomical telescope mounts
Automated Manufacturing & Semiconductor
  • Wafer handling robotic vacuum arms
  • High-speed circuit board assembly lines
  • Precision fluid dispensing rotations
  • Automated optical inspection (AOI) systems
Printing & Textile Machinery
  • Wide-format digital printer rollers
  • High-speed yarn tensioning spindles
  • Automated fabric cutting drive shafts
  • Precision offset printing plate cylinders

Key Performance Features

01. Optimized Large-Bore / Thin-Section Ratio

The 6711-ZZ allows for a 55mm shaft to be supported within a very small radial clearance. This "Thin-Section" geometry is critical for engineers looking to route electrical wiring, pneumatic lines, or coolant through the center of a rotating shaft while keeping the overall machine size manageable and lightweight.

02. Low-Friction Metal Shielding (ZZ)

Equipped with two non-contact pressed steel shields, the 6711-ZZ ensures that factory-applied lubrication stays within the raceways while preventing the entry of larger contaminants. Because the shields do not touch the inner ring, there is virtually zero drag, allowing the bearing to operate at higher speeds with much lower heat generation than sealed alternatives.

03. Precision Chrome Steel Construction

Manufactured from vacuum-degassed GCr15 chrome steel, this bearing offers exceptional fatigue life and dimensional stability. The high-grade balls and polished raceways ensure minimal vibration and noise, which is vital for sensitive applications like optical tracking and laboratory automation.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 67 Series (Extra-Thin)
Basic Designation 6711
Suffix ZZ (Double Non-Contact Metal Shields)
Bore Diameter (d) 55 mm
Outer Diameter (D) 68 mm
Width (B) 7 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard (P0) / P6 or P5 Available Upon Request
Cage Material Pressed Steel
Dynamic Load Rating (Cʳ) 6.35 kN
Static Load Rating (C₀ʳ) 6.65 kN
Limiting Speed (Grease) 8,200 r/min
Limiting Speed (Oil) 10,000 r/min
Weight (approx.) 0.050 kg

Interchange Part Numbers

Compatible with the following industry-standard thin-section designations:

  • SKF: 61711-2Z / 6711-2Z
  • NSK: 6711ZZ
  • FAG: 6711.2Z
  • NTN: 6711ZZ
  • KOYO: 6711ZZ

Design & Configuration

The 6711-ZZ is supplied pre-greased for maintenance-free operation under normal conditions. For high-temperature environments or vacuum applications, we can provide customized lubrication options or cage materials. If your application requires protection against liquids or fine dust, we recommend the 6711-2RS (contact rubber seals). Stainless steel (AISI 440C) versions are also available for maximum corrosion resistance in specialized sectors.

"The 6711-ZZ is the definitive solution for engineers demanding high-speed reliability and a minimalist footprint for large-diameter shaft applications."

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