Constructed to endure extreme mechanical forces while maintaining high rotational efficiency, the 6318-ZZ is a heavy-series deep groove ball bearing designed for the most demanding industrial applications. Fortified with dual pressed-steel shields (ZZ), this bearing excels at retaining its factory-filled lubricant while blocking out larger particulate contaminants. Because these metal shields are designed not to make physical contact with the inner ring, the 6318-ZZ minimizes friction and startup drag, making it an exceptional choice for large 90mm bore equipment like high-capacity electric motors, heavy-duty centrifugal pumps, and mining conveyors.