Automobile Parts

What is Freight Class?

Freight class is a standard classification system for shipments, defined by the National Motor Freight Traffic Association (NMFTA). It's used to categorize commodities like Automobile Parts for transport, taking into account factors like weight, dimensions, density, storage capability, ease of handling, and liability. Freight class is a system to categorize different types of goods being shipped.

How to determine Freight Class

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Density is a key concept in freight shipping, as it significantly impacts the freight class for commodities like Automobile Parts and hence, the shipping cost. It is calculated as the weight of the shipment divided by its volume. Density in LTL shipping is a measure of how heavy a shipment is for its size.

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Stowability is used in freight shipping to describe how easily an item can be stowed or stored in relation to other items. For example, when trying to understand stowability for Automobile Parts, it is important to know if the item can be packaged efficiently and stowed onto the truck easily. In other words- Stowability is the ease of storing or stacking freight items for shipping.

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Liability is a term used to refer to the accountability or risk involved in transporting Automobile Parts. It's one of the factors considered when determining freight class. Liability is the degree of risk or responsibility assumed in the shipping process.

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Handling refers to the procedures and precautions taken when moving and storing Automobile Parts. It is one of the factors considered when determining freight class for Automobile Parts. Handling refers to the measures involved in transporting goods safely.

Freight Class Commodities


Automobile Bumpers

Automobile Part Bags

Automobile Parts System


In Packages

Repair Panels

Vacuum Cleaner








Other than cellular, expanded or foam plastic or rubber, combined or not combined with steel. Applies on bumpers or stops such as for limiting the travel of, or preventing metal-to-metal contact of, suspension or drive train members, doors, windows, hoods, deck lids, or clutch or brake pedals. Does not apply on vehicle front or rear impact absorbing bumpers or on parts of such bumpers.

Suspension, NOI, freight truck or trailer, loose or in packages

Cloth, canister type, with vinyl or rubber gasket attached, in boxes

Common Commodity Items



For many NMFC® codes there isn’t just one single class that is applied. Often, NMFC® numbers have multiple "sub-classes", which are almost always based on the density of the shipment. In the instance where your NMFC® number has multiple sub classes, it's best to contact an expert, like Koho, to help identify which subclass to use.


Where can I find freight class code lookup?

The National Motor Freight Traffic Association (NMFTA) annually publishes a list of freight class designations, codes, and subclasses for commonly shipped items ( To access this list, you are required to pay a subscription fee. Learn more about freight classes for free on our freight classes pages.

Are NMFC and Freight Classes the same thing?

Every commodity has both a freight class and a NMFC code. Freight class represents a category of items while NMFC codes relate to specific commodities within each of the 18 freight classes.