What is freight class?
Freight Class refers to the National Motor Freight Classification (NMFC) and it is the category of your freight as defined by the National Motor Freight Traffic Association (NMFTA).
Your shipment's freight class determines the carrier's shipping charges. There are 18 freight classes ranging from class 50 (the least expensive) to class 500 (the most expensive). The class of your shipment is determined by its contents and NMFC item number.