2022 NAICS national industry in sector 31-33 Manufacturing
336120 Heavy Duty Truck Manufacturing
NAICS 336120 is the US industry code for heavy duty truck manufacturing. It covers establishments primarily engaged in (1) manufacturing heavy duty truck chassis and assembling complete heavy duty trucks, buses, heavy duty motor homes, and other special purpose heavy duty motor vehicles for highway use or (2) manufacturing heavy duty truck chassis only.
- Code
- 336120 (2022 NAICS)
- Title
- Heavy Duty Truck Manufacturing
- Part of
- Motor Vehicle Manufacturing
- SBA small business limit
- Up to 1,500 employees
- Closest UK SIC
- 29100 (details)
Changes coming. The NAICS 2027 revision applies to data from 1 January 2027, and SBA proposed new size standards on 20 August 2026. The values on this page are the ones in force today; we update this page when the official files change.
Official definition
This industry comprises establishments primarily engaged in (1) manufacturing heavy duty truck chassis and assembling complete heavy duty trucks, buses, heavy duty motor homes, and other special purpose heavy duty motor vehicles for highway use or (2) manufacturing heavy duty truck chassis only.
When to use a different code
Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:
- Manufacturing truck and bus bodies and assembling vehicles on purchased chassis are classified in U.S. Industry 336211, Motor Vehicle Body Manufacturing.
- Manufacturing motor homes on purchased heavy truck chassis are classified in U.S. Industry 336213, Motor Home Manufacturing.
- Manufacturing vans, minivans, and light trucks are classified in Industry 336110, Automobile and Light Duty Motor Vehicle Manufacturing.
- Manufacturing military armored vehicles are classified in U.S. Industry 336992, Military Armored Vehicle, Tank, and Tank Component Manufacturing.
- Manufacturing off-highway construction equipment are classified in Industry 333120, Construction Machinery Manufacturing.
Activities listed under 336120
The Census index assigns these 11 activities to this code. If your business matches one, this is your code.
- Assembly plants, heavy trucks, and buses on chassis of own manufacture
- Buses (except trackless trolley) assembling on chassis of own manufacture
- Chassis, heavy truck, with or without cabs, manufacturing
- Garbage trucks assembling on chassis of own manufacture
- Heavy trucks assembling on chassis of own manufacture
- Highway tractors assembled on chassis of own manufacture
- Motor homes, self-contained, mounted on heavy truck chassis of own manufacture
- Special purpose highway vehicles (e.g., firefighting vehicles) assembling on heavy chassis of own manufacture
- Tractors, truck for highway use, assembled on chassis of own manufacture
- Truck tractors for highway use, assembling on chassis of own manufacture
- Trucks, heavy, assembling on chassis of own manufacture
SBA size standard for 336120
To count as a small business for SBA loans and federal contracts under NAICS 336120, your business (including affiliates) must not exceed 1,500 employees. Check your business.
Source: SBA table of size standards, effective March 17, 2023.
Closest UK SIC 2007 codes
There is no official one-to-one link between NAICS and UK SIC. These codes share the same international class (ISIC Rev. 4: 2910), so treat them as a starting point and check the definition.
Built from Census concordances 2022→2017 NAICS and 2017 NAICS→ISIC Rev. 4.
Similar codes to compare
Data last changed November 14, 2026. How this page is built.