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68 Series
Home Deep Groove Ball Bearings 68 Series

688 ZZ Miniature Deep Groove Ball Bearing for Small Motors and Compact Mechanisms | 8×16×5 Mm

688 ZZ Miniature Deep Groove Ball Bearing for Small Motors and Compact Mechanisms | 8×16×5 Mm

The 688-ZZ is a Reliable Miniature Deep Groove Ball Bearing designed for applications that require a balance of compact cross-section, contamination protection, and smooth operation. Equipped with double metal shields (ZZ), it offers effective two-side defense against dust and debris while maintaining low rotational torque. With an 8 mm bore and a slim 5 mm width, this bearing is particularly suited for small electric motors, compact fans, and precision mechanisms where radial space is limited and environmental protection is valued.

688 ZZ Deep Groove Ball Bearing 8x16x5 mm | ISO 68 Series – Extra Light | Double Shielded

Featuring the versatile deep groove raceway, this bearing supports stable performance at speeds up to 36,000 r/min (Oil). The 688-ZZ is engineered to carry moderate radial loads and offers support for light axial loads in both directions, making it a dependable component in various small electromechanical assemblies, instrumentation, and devices operating in typical industrial or commercial environments.

688 ZZ Miniature Deep Groove Ball Bearing for Small Motors and Compact Mechanisms | 8×16×5 Mm

Comprehensive Applications

Suited for a wide array of applications where a slim profile and protected operation are key:

Industrial & Automation Components
  • Small Conveyor Rollers
  • Pneumatic and Valve Actuators
  • Packaging Machine Guides
  • Light-Duty Robotic Joints
Office & Commercial Machinery
  • Desktop Printers and Scanners
  • ATM and Card Reader Mechanisms
  • Presentation and Display Rotators
  • Commercial Ventilation Fans
Precision Instrumentation & Controls
  • Sensor Rotors and Encoders
  • Metering Devices and Gauges
  • Precision Optical Adjusters
  • Laboratory Equipment Drives
Small Electric Motors & Drives
  • Small AC/DC and Brushless Motors
  • Compact Cooling Fans
  • Micro Gearboxes and Speed Reducers
  • Small Appliance Motors

Key Performance Features

01. Efficient Dust Protection with Steel Shields

Double non-contact steel shields (ZZ) provide reliable sealing from both sides against dust and larger particulates. This design helps preserve the factory-applied lubrication and extends service life without adding significant frictional drag.

02. Extra-Light Series with Compact Design

Built to the extra-light 68 series in a compact 8×16×5 mm format, this bearing achieves a useful load capacity within a notably slim axial width. Its design is engineered for applications where minimizing space and weight is a critical design constraint.

03. Reliable for High-Speed Applications

Manufactured to consistent precision standards with optimized internal geometry, it promotes smooth, stable rotation with minimal vibration, making it a dependable choice for high-speed operation in small motors and compact drive units.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 68 Series – Extra Light
Basic Designation 688
Suffix ZZ (Both sides with steel shields)
Bore Diameter (d) 8 mm
Outer Diameter (D) 16 mm
Width (B) 5 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard / P5 Grade Available
Cage Material Pressed Steel
Dynamic Load Rating (Cʳ) 2.58 kN
Static Load Rating (C₀ʳ) 1.12 kN
Limiting Speed (Grease) 26,000 r/min
Limiting Speed (Oil) 36,000 r/min
Weight (approx.) 4.9 g

Interchange Part Numbers

Direct replacement for:

  • SKF: 688-ZZ
  • NSK: 688 ZZ
  • FAG: 688 ZZ
  • NMB: R-1688ZZ
  • NTN: 688ZZ

Design & Configuration

The 688-ZZ is supplied as a standard, pre-lubricated unit featuring double pressed steel shields. This configuration offers enhanced internal protection, making it suitable for applications in environments prone to dust or larger debris. For conditions requiring a higher degree of sealing against moisture or fine contaminants, the double rubber contact seal variant (688-2RS) is available as an alternative.

"For compact motor designs, especially those operating at higher speeds in dusty conditions, the 688-ZZ provides an optimal balance of reliable dust protection and a space-saving, low-friction profile."

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Request a Quote for Ball Bearings

Request a Quote for Ball Bearings
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