NMFC Number vs Freight Class: What Is the Difference?
A freight class is the rating category the carrier uses to price an LTL shipment; an NMFC number identifies the commodity. Here's what each one does, why both matter, and how to enter them correctly.
An NMFC number identifies the commodity provision used to classify freight. Freight class is the rating category that results from applying that provision to the shipment. They are related, but they are not interchangeable.
| Field | What it identifies | Typical form |
|---|---|---|
| NMFC item number | The commodity entry and its applicable classification provisions | Item number, sometimes with a subitem |
| Freight class | The rating category assigned under the provision | One of 18 classes from 50 to 500 |
The short version is: the NMFC item tells you which rules to read; the class tells you the resulting classification category.
What an NMFC item number does
“NMFC code” is a common shipping term for an NMFC item number. The item points to a commodity description in the National Motor Freight Classification. Its entry may contain:
- Commodity or group descriptions
- Subprovisions
- One class or multiple possible classes
- Density ranges
- Packaging requirements
- Notes and definitions
- References to other NMFC rules
An item number does not always produce one fixed class. A density-based item may contain several subprovisions, each tied to a packaged-density range and class. Other items may reflect handling, stowability, liability, packaging, or commodity-specific conditions.
That is why the item and subitem must be read rather than treated as a simple database key that automatically returns one universal answer.
What freight class does
Freight class is the number assigned to an article or group of articles for rating purposes under the NMFC or an applicable exception. There are 18 classes:
50, 55, 60, 65, 70, 77.5, 85, 92.5, 100, 110, 125, 150, 175, 200, 250, 300, 400, and 500.
The National Motor Freight Traffic Association determines classification through four transportation characteristics: density, handling, stowability, and liability. Generally, freight that is denser and easier to handle and stow receives a lower class number. Freight with more difficult transportation characteristics may receive a higher number.
That general pattern is not a substitute for the current commodity provision. Do not select a class by looking at the list and choosing the number that seems closest.
How the two fields work together
A complete classification record may include the commodity description, package, NMFC item number, subprovision, and class. The relationship works in this order:
- Identify the commodity and packaging.
- Locate the matching NMFC item.
- Read its subprovisions, notes, packages, and referenced rules.
- Measure and weigh the final handling unit when required.
- Apply the class specified by the current provision.
The item provides the classification context. The class is the category selected after applying that context to the actual freight.
This also explains why two shipments can share a class without sharing an NMFC item. Different commodities can resolve to the same class even though their descriptions and governing provisions are different.
One NMFC item can have more than one class
The earlier draft of this distinction often gets oversimplified into “one code equals one class.” That is not reliable.
An NMFC item can contain multiple subprovisions. For a density-based item, the shipment’s packaged pounds per cubic foot may determine which subprovision and class apply. An item with significant handling, stowability, or liability considerations may use a different classification structure.
Record the full result: item number, applicable subitem or subprovision, and class. Saving only one of those fields can leave out the reason the class was selected.
The NMFC is a standard, not every carrier’s contract
NMFTA describes the NMFC as a voluntary industry standard. Its current FAQ says the standard should be used to assign class absent a tariff published by the carrier or other governing terms.
That qualification matters when preparing a quote. The NMFC provides the classification framework, but applicable carrier tariffs, exceptions, customer pricing arrangements, or other terms may affect how the shipment is rated.
Do not assume that finding an NMFC item on a public page overrides the documents governing the shipment.
What should appear on the shipping record
NMFTA’s current Item 250100 guidance says bill-of-lading commodity descriptions must match the tariff and include the article, package, special markings, applicable exceptions, NMFC item number, subprovision, and class.
Use consistent information in the quote request, bill of lading or electronic record, and tender details. If the packaging, commodity, dimensions, or weight changes after quoting, review the item and class again.
Carrier forms and quote tools may vary, so follow the fields and governing terms for the selected service. Do not enter a guessed item or class merely to make the form accept the shipment.
Why current information matters
NMFTA updates the classification through dockets, disposition bulletins, and supplements. Proposed changes appear in a docket, decisions are recorded in a disposition bulletin, and approved changes amend the NMFC through a supplement with an effective date.
An item or class saved from an old shipment may therefore be outdated. ClassIT+ connects to NMFTA’s current classification data and supports searches by commodity, keyword, attribute, or item number.
Check frequently used classifications on a regular schedule and when NMFTA publishes changes that affect the commodity. Avoid relying solely on an old bill of lading, spreadsheet, or third-party chart.
Common mistakes
Watch for these errors:
- Entering the freight class where the form requests an NMFC item number
- Entering an item number where the form requests a class
- Assuming one item number always has one class
- Ignoring the subitem or density provision
- Searching with a vague category instead of a precise commodity description
- Using bare-product measurements rather than final packaged measurements
- Reusing an old item and class without checking current NMFC data
- Selecting a lower class because it produces a more attractive rate
Classification should describe the freight as tendered, not the price the shipper hopes to receive.
What to gather before requesting a quote
Prepare:
- Precise commodity description
- Packaging type
- NMFC item number and subprovision when applicable
- Confirmed freight class
- Final packaged length, width, and height for each handling unit
- Packaged weight for each handling unit and total shipment weight
- Handling-unit and piece counts
- Stackability and unusual handling characteristics
- Hazardous-material status when applicable
- Origin and destination postal codes
- Requested pickup date and required pickup or delivery services
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