The 6302 ZZ CM NSK is a single row ball bearing manufactured by NSK with a bore diameter (Øint) of 15mm, outer diameter (Øout) of 42mm, width (W) of 13mm and made from bearing steel. CM stands for contact seal that retains lubricant and helps prevent dirt/contaminants from entering the bearing. ZZ refers to the fact that the outer and inner rings are double-shielded for extra protection from dust and contaminants. NSK is the manufacturer of the bearing.