This page provides information on estimating the required freight class for less than truckload/truckload (LTL/TL) shipments by Amazon-partnered carriers.
The National Motor Freight Traffic Association (NMFA) defines freight class as a standardized classification system used to determine the billable weight and risk of a shipment. Freight class is ranked from 50 to 500 with class 50 incurring the lowest shipping cost and 500 incurring the highest.
Sellers are expected to provide accurate packaging inputs when creating a shipment. This packaging information triggers a freight class estimate. If Amazon suspects the freight class of your shipment is too low, a warning will be displayed showing an Amazon estimated freight class. If you are unsure of your shipment's freight class, choose the Estimate my freight class option during the Shipping charges step of the Prepare Shipment workflow.
You will be asked to accept Amazon's estimated freight class. Be aware that shipments with rejected freight class estimates are subject to further investigation. Recurring issues with packaging inputs may lead to Amazon disabling your ability to reject freight class estimates.