336120 — Heavy Duty Truck Manufacturing
Description
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 (as defined in the official U.S. Census Bureau 2022 NAICS Manual).
Exclusions & Cross-References
- 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; and
- Manufacturing off-highway construction equipment--are classified in Industry 333120, Construction
- Machinery Manufacturing.
Overview Facts
Legacy SIC Concordance
Trace the historical mapping chain from the 1987 Standard Industrial Classification (SIC) to the modern 2022 NAICS code format.
- SIC 3711 - Motor Vehicles and Passenger Car Bodies (via SIC1987:3711→NAICS1997:33612→2002:336120→2007:336120→2012:336120→2017:336120→2022:336120)
Suggested Product Service Codes (Advisory)
The following Product Service Codes (PSCs) are advisory suggestions aligned with this NAICS code. Note: NAICS and PSC codes map to different dimensions of procurement (industry vs. product/service). There is no official binding 1:1 crosswalk.
- PSC H223 — Equipment and Materials Testing: Ground Effect Vehicles, Motor Vehicles, Trailers, and Cycles
Source: DoD DPCAP PSC Selection Tool (Ingested: 2026-06-29)
Frequently Asked Questions (FAQ)
Is NAICS code 336120 valid in 2022? ▾
Yes, 336120 is a valid 6-digit 2022 NAICS national industry code representing 'Heavy Duty Truck Manufacturing' under Sector 31-33 in the official classification index.
What is the SBA size standard for NAICS code 336120? ▾
The Small Business Administration (SBA) has established a small business size standard of 1,500 employees for NAICS code 336120 (Heavy Duty Truck Manufacturing), calculated based on employees.
What is the legacy SIC equivalent for NAICS 336120? ▾
According to official Census Bureau concordance tables, NAICS code 336120 (Heavy Duty Truck Manufacturing) maps to legacy 1987 Standard Industrial Classification (SIC) codes: 3711 - Motor Vehicles and Passenger Car Bodies.
Related Pages & Tools
Further regulatory reference links for NAICS code 336120:
- Sector 31-33 Directory Hub — List of related industries in the Manufacturing sector.
- SIC ↔ NAICS Crosswalk Tool — Look up mappings between legacy SIC codes and modern classifications.
- NAICS 336120 to SIC Crosswalk — Bidirectional mapping to legacy SIC codes (Heavy Duty Truck Manufacturing).
- SBA Size Standards Guide — Complete rules and averaging periods for small business classifications.
- Calculating Annual Receipts Guide — Detailed worked example of revenue calculation rules.
- IRS Principal Business Activity Guide — How NAICS codes map to corporate and entity tax filings.