Specifications for Belt Size 339-3M-18 Cross References Numbers: 339-3M,  339-3M-18,  339-3M/18 Number of Teeth 113 *Length of Belt 339mm or ~13-5/16" Peak to Peak Distance Between Two Adjacent Belt Teeth 3mm or ~1/8" Width of Belt 18mm or ~3/4"

*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.