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What is freight class?

Established by the National Motor Freight Traffic Association (NMFTA), the freight classification or "class" system helps streamline LTL shipping costs across the industry. Shipments are categorized into one of 18 standard or 11 density-based freight classes based on your freight’s density, stowability, handling and liability. These range from class 50 (the least expensive) to class 500 (the most expensive) and will be one of the main determining factors of your final shipping rate.
What is freight class?