What Is an NMFC Code?
An NMFC code is a 4-to-6-digit number NMFTA assigns to a commodity. Learn how it maps to a freight class, what dockets change, and how to look up the right code.
An NMFC code is the term many shippers use for an NMFC item number: the identifier attached to a commodity description in the National Motor Freight Classification. The item helps you locate the applicable classification provisions, including possible subitems, classes, notes, packaging requirements, and referenced rules.
It is not the same thing as freight class. The item number identifies the commodity provision. Freight class is the rating category produced by applying that provision to the freight being shipped.
NMFC item number versus freight class
The National Motor Freight Classification contains 18 freight classes from 50 to 500. Those classes are based on density, handling, stowability, and liability.
An NMFC item can contain more than one subprovision or class. For example, a density-based item may direct the user to select a class from a scale after calculating the packaged density. Another item may include special provisions reflecting handling, stowability, liability, or packaging conditions.
This means an item number does not always have a one-to-one relationship with a single class. Record the applicable item, subitem, and class rather than assuming the item number alone finishes the classification.
What information an NMFC item provides
A current NMFC entry can include:
- The commodity or group description
- An item number
- Subprovisions or density breaks
- The applicable freight class or classes
- Required packaging information
- Notes, definitions, and references to other rules
- Symbols identifying special classification considerations
The exact structure varies by item. Read the full provision rather than stopping at the first search result that resembles the product name.
“Auto parts,” “machinery,” or “furniture” may be too broad to identify the correct entry. Material, form, use, condition, and packaging can distinguish one commodity provision from another.
Who maintains the NMFC
The National Motor Freight Traffic Association maintains the NMFC through its Freight Classification Development Council. NMFTA describes the NMFC as a voluntary industry standard used to compare commodities moving in interstate, intrastate, and foreign commerce.
The voluntary qualification matters. NMFTA states that the NMFC is the standard to use when class is being determined absent an applicable carrier tariff or other governing terms. Do not assume a public NMFC lookup overrides the carrier documents or pricing agreement that applies to a shipment.
The four classification characteristics
NMFC provisions reflect four transportation characteristics.
Density
Density describes the packaged weight in relation to packaged cubic volume. It should be calculated from the complete handling unit as tendered, including pallets, crates, cartons, padding, wrap, and projections.
Handling
Handling considers how easy or difficult the commodity is to move across a dock and into or out of transportation equipment. Size, weight, configuration, fragility, hazardous characteristics, and special-care needs may matter.
Stowability
Stowability concerns how effectively the freight can be placed with other freight in a trailer. Excessive dimensions, protrusions, loading restrictions, and limited load-bearing surfaces are among the possible considerations.
Liability
Liability can include susceptibility to damage, the potential to damage other freight, perishability, and hazardous nature.
These characteristics are not a do-it-yourself scoring system. Their effect is built into the current NMFC provisions.
How NMFC provisions change
NMFTA updates the classification system through dockets, disposition bulletins, and supplements.
- A docket presents proposed changes and supporting analysis for public review.
- A disposition bulletin records the Freight Classification Development Council’s decisions.
- A supplement amends the NMFC and gives the approved changes their stated effective date.
The current public-docket library shows that this process continues in 2026. A saved item number or class from an older shipment should therefore be checked before it is reused.
ClassIT+ connects to NMFTA’s current classification data and includes change information. That makes it a better reference than an undated third-party table or an old internal spreadsheet.
How to find the right item number
Use a commodity-first process:
- Identify what the product actually is, including material, form, and use.
- Record how it is packaged and tendered.
- Search ClassIT+ using specific commodity terms and attributes.
- Compare the possible entries instead of choosing the first similar phrase.
- Read the item, subitems, notes, packages, and referenced rules.
- Calculate packaged density if the provision requires it.
- Record the applicable NMFC item number, subprovision, and freight class.
If the correct entry remains unclear, NMFTA offers formal Classification Interpretations Assistance. That process provides a written response identifying the appropriate item and commodity description after NMFC specialists review the submitted information.
What belongs on the shipment record
NMFTA’s current guidance for bill-of-lading commodity descriptions includes the article, package, special markings, applicable exceptions, NMFC item number, subprovision, and class. Keeping those fields aligned reduces ambiguity between the quote and the freight tendered.
Use the same classification information in:
- The rate request
- The bill of lading or electronic shipping record
- Internal warehouse instructions
- The saved shipment record
If packaging, dimensions, weight, or the commodity itself changes after quoting, review the classification again before tender.
Common mistakes
Avoid these shortcuts:
- Treating the NMFC item number and freight class as interchangeable
- Assuming every item number produces one fixed class
- Searching with a vague category instead of a specific commodity description
- Ignoring subitems, notes, packaging requirements, or referenced rules
- Applying a generic density chart before confirming the item is density-based
- Reusing an old code and class without checking current NMFC data
- Selecting an entry because it produces the lowest quote
The objective is an accurate description under the applicable current provision, not the lowest plausible class.
What to gather before requesting a quote
Prepare:
- Precise commodity description
- NMFC item number and subitem when applicable
- Confirmed freight class
- Final packaged dimensions and weight for each handling unit
- Packaging type and handling-unit count
- Stackability and special handling characteristics
- Hazardous-material status when applicable
- Origin and destination postal codes
- Requested pickup date
- Required pickup and delivery services
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