NAICS 336120

Overview

The North American Industry Classification System (NAICS) is the federal statistical standard for organizing U.S. business establishments to produce comparable economic data. Developed under the Office of Management and Budget with Canada and Mexico, NAICS replaced SIC in 1997 and is revised every five years; the current vintage is 2022. ¹

NAICS 336120 covers establishments primarily manufacturing heavy duty truck chassis and assembling complete heavy duty trucks, buses, heavy duty motor homes, and other special‑purpose heavy duty highway motor vehicles, or manufacturing heavy duty truck chassis only. Federal datasets, including the Economic Census and County Business Patterns, use this classification to aggregate and publish statistics for the heavy duty truck manufacturing industry. ²

See also on G2X:

• G2X — NAICS 336120 overview
• G2X — NAICS 336112
• G2X — NAICS 336211

What this NAICS covers

• Manufacturing heavy duty truck chassis for highway vehicles. ²
• Assembling complete heavy duty trucks for highway use. ²
• Assembling heavy duty buses for highway use. ²
• Assembling heavy duty motor homes (on heavy duty chassis). ²
• Producing other special‑purpose heavy duty highway vehicles (e.g., vocational trucks) as part of complete vehicle assembly. ²
• Manufacturing heavy duty truck chassis only (sold as chassis). ²

Related NAICS and PSC codes

Type	Code	Descriptor
NAICS	336112	Light Truck and Utility Vehicle Manufacturing (distinct from heavy duty). 2
NAICS	336211	Motor Vehicle Body Manufacturing (bodies/assembly on purchased chassis). 2
NAICS	336213	Motor Home Manufacturing (motor homes on purchased chassis). 2
PSC	2320	Trucks and Truck Tractors, Wheeled (product/service classification for procurement). 4

Key cross‑references and exclusions

• Truck and bus body manufacturing, including assembling vehicles on purchased chassis, is classified in 336211. ²
• Motor homes built on purchased chassis are classified in 336213. ²
• Vans, minivans, and light trucks fall under 336112. ²
• Military armored vehicles are classified in 336992. ²

Frequently asked questions

• What activities are included in NAICS 336120?
  Heavy duty truck chassis manufacturing; assembly of complete heavy duty trucks, buses, heavy duty motor homes, and other special‑purpose heavy duty highway vehicles; and manufacturing heavy duty chassis sold separately. These activities define the industry boundary for federal statistics. ²

• How is 336120 different from 336112?
  336120 covers heavy duty highway vehicles and chassis; 336112 covers vans, minivans, and light trucks. The distinction hinges on vehicle class (heavy duty vs. light duty) and corresponding product scope. ²
  See also on G2X: NAICS 336112.

• Are truck trailers included in 336120?
  No. Truck trailers are classified in 336212. Bodies and assembly on purchased chassis are in 336211, not 336120. ²
  See also on G2X: NAICS 336212.

• Do firefighting vehicles fall under 336120?
  Yes. Census reporting treats firefighting vehicles as part of heavy duty truck manufacturing, reflected in industry statistics discussing fire apparatus within NAICS 336120. ⁵

• What is the current NAICS version used for federal economic statistics?
  The current NAICS vintage is 2022. Census programs began releasing data on a 2022 NAICS basis starting in 2024, and most programs are scheduled to adopt 2022 NAICS by the end of 2027. ³

Useful resources

• Census NAICS industry description for 336120. ²
• Census: Implementation of the 2022 NAICS (timeline and guidance). ³
• Acquisition.gov: Product and Service Code Manual (official PSC definitions). ⁴

References

1. U.S. Census Bureau — About Industry and Occupation: Industry (NAICS background; 1997 adoption; updates through 2022). https://www.census.gov/topics/employment/industry-occupation/about/industry.html
2. U.S. Census Bureau — NAICS 2022 Definition: 336120 Heavy Duty Truck Manufacturing. https://www.census.gov/naics/?input=336120&year=2022
3. U.S. Census Bureau — The Census Bureau’s Implementation of the 2022 NAICS (current vintage and transition schedule). https://www.census.gov/library/reference/code-lists/naics/2022/implementation-timeline.html
4. Acquisition.gov — Product and Service Code (PSC) Manual (official PSC definitions). https://www.acquisition.gov/psc-manual
5. U.S. Census Bureau — “January 2021: 1890 Census Fire” (By the Numbers note referencing firefighting vehicles in NAICS 336120). https://www.census.gov/about/history/stories/monthly/2021/january-2021.html