By Outrider Editorial Team · Updated August 20, 2026
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.
FY2025 obligations
$397.5M
Contract actions
885
IDVs
43
Top buying agencies
- Department of Defense$287.6M
- General Services Administration$77.5M
- Department of Agriculture$15.5M
- Department of State$6.1M
- Department of the Interior$3.3M
FY2025 federal contract obligations, USAspending.gov
NAICS 336120 obligated $398 million in FY2025 across 885 contract actions. DoD is $288 million, GSA $78 million, USDA $16 million for Forest Service fire apparatus and heavy fleet, State $6 million, Interior $3 million. The DoD and GSA halves buy different products: militarized tactical trucks against detailed specifications, versus commercial heavy trucks ordered through fleet standards.
What belongs here
Heavy duty truck chassis manufacturing and assembly of complete heavy duty trucks, buses, heavy duty motor homes, and other special purpose heavy duty highway vehicles, or heavy duty chassis alone.
- Light duty vehicles and their chassis are 336110.
- Bodies built onto purchased chassis are 336211.
- Trailers and semitrailers are 336212.
Competing in this code
Only 43 IDVs cover 885 actions at an average of $450,000, so most awards are individually competed. That is a meaningful opening compared with the light duty code, where GSA arrangements dominate. Specialty applications are where a smaller manufacturer wins: fire apparatus, refuse and utility bodies on heavy chassis, and mission-configured trucks that mainstream production lines will not accommodate at federal quantities. The 1,500-employee size standard is generous enough that essentially any specialty truck builder qualifies as small.
Frequently Asked
NAICS 336120 questions, answered.
What is the SBA size standard for NAICS 336120?
SBA sets it at 1,500 employees, counted as a 24-month average headcount across your company and every affiliate, not revenue. At or under that number you are small on NAICS 336120 solicitations and eligible for the set-asides in this code.
Which agencies buy heavy duty trucks under NAICS 336120?
FY2025 obligations: DoD ($288 million), GSA ($78 million), USDA ($16 million), State ($6 million), Interior ($3 million). DoD buys militarized tactical trucks to specification while GSA and USDA buy commercial heavy vehicles to fleet standards, and the two requirements share almost nothing.
Where does a specialty truck builder fit in NAICS 336120?
In applications mainstream production lines will not accommodate at federal quantities: fire apparatus, refuse and utility configurations on heavy chassis, and mission-specific builds. Only 43 IDVs cover 885 actions, so these compete individually rather than through standing fleet arrangements, and the 1,500-employee standard keeps almost any specialty builder small.
What is the boundary between NAICS 336120 and 336211?
Whether you supply the chassis. 336120 covers manufacturing heavy duty chassis and assembling complete heavy trucks. 336211 covers building bodies and cabs, which may be mounted on chassis purchased from someone else. Upfitters belong in 336211 even when the finished product is a complete truck.
Register Under NAICS 336120
Classify your business correctly to maximize visibility to federal buyers and access small business set-asides.
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