Specifications for Belt Size 520-5M-12 Cross References Numbers 520-5M,  520-5M-12,  520-5M/12 Number of Teeth 104 *Length of Belt 520mm or ~20-7/16" Peak to Peak Distance Between Two Adjacent Belt Teeth 5mm or ~3/16" Width of Belt 12mm or ~7/16"

*Length of belt is the overall size of the belt's loop measured as if the belt were cut between two adjacent teeth and laid out on a flat surface.