The 6209 ZZ CM NSK bearing is a ball bearing manufactured by NSK. It has an inner diameter of 45 millimeters, an outer diameter of 85 millimeters, and a width of 19 millimeters. It is made of bearing steel and is double shielded for added protection against dust, dirt, and other contaminants. This bearing is ideal for applications such as electric motors, pumps, fans, and compressors.