Specifications for Belt Size 320-5M-15 Cross References Numbers: 320-5M,  320-5M-15,  320-5M/15 Number of Teeth 64 *Length of Belt 320mm or ~12-9/16" Peak to Peak Distance Between Two Adjacent Belt Teeth 5mm or ~3/16" Width of Belt 15mm or ~9/16"

*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.