The MR84-ZZ is a high-performance, single-row miniature ball bearing engineered for applications that require a perfect equilibrium between a small footprint and structural rigidity. Featuring a 4x8x3 mm geometry, this component is equipped with dual non-contact metal shields (ZZ) that protect the internal raceways from larger debris while ensuring the lowest possible starting torque. Its balanced width-to-diameter ratio makes it an essential component for high-speed micro-motors and precision encoders where dynamic stability and low heat generation are critical for long-term reliability.