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.