• Small Conveyor Rollers
• Pneumatic and Valve Actuators
• Packaging Machine Guides
• Light-Duty Robotic Joints

• Desktop Printers and Scanners
• ATM and Card Reader Mechanisms
• Presentation and Display Rotators
• Commercial Ventilation Fans

• Sensor Rotors and Encoders
• Metering Devices and Gauges
• Precision Optical Adjusters
• Laboratory Equipment Drives

• Small AC/DC and Brushless Motors
• Compact Cooling Fans
• Micro Gearboxes and Speed Reducers
• Small Appliance Motors

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.

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."