The 618-5ZZ is an ultra-small, precision-engineered ball bearing designed for micro-mechanical assemblies where space is at an absolute premium. Equipped with dual-sided metal shields (ZZ), this bearing is optimized for high-frequency rotation by maintaining internal lubricant integrity while minimizing parasitic drag. With a 5mm bore and a compact 11mm outer diameter, the 618-5ZZ provides the essential stability required for micro-servos, high-speed cooling fans, and sensitive medical sensors that demand nearly silent, low-vibration performance.