The Koyo 6004 Single Row Ball Bearing is built from durable steel and designed for reliable performance in moderate radial and low axial load applications. It features a 0.7874 in (20 mm) round bore, 1.6535 in (42 mm) outer diameter, and 0.4724 in (12 mm) overall width. With a riveted steel cage, open closure, and C0 internal clearance, this single-row bearing ensures smooth operation and stability, making it a dependable choice for light to medium-duty machinery.