The Koyo 16004C3 Single Row Ball Bearing is an open-type bearing designed for smooth operation in moderate radial and low axial load applications. It has a 20 mm (0.7874 in) inner diameter, 42 mm (1.6535 in) outer diameter, and 8 mm (0.315 in) width, with C3 internal clearance to ensure reliable performance under thermal expansion and higher running speeds. Constructed from durable steel with a round bore, riveted steel cage, and open closure, this bearing provides strength, precision, and versatility for a wide range of light to medium-duty machinery and equipment.