NAICS 333120

Overview

The North American Industry Classification System (NAICS) is the production‑oriented standard used by U.S. federal statistical agencies to group business establishments for consistent collection, analysis, and publication of economic data. Developed jointly with Statistics Canada and Mexico’s INEGI and overseen by OMB’s Economic Classification Policy Committee, NAICS replaced SIC in 1997 and is updated every five years; the current vintage is 2022. ¹

NAICS 333120 covers establishments primarily engaged in manufacturing construction machinery, surface mining machinery, and logging equipment. Illustrative products include backhoes, bulldozers, construction‑type tractors and attachments, pile drivers, road graders, off‑highway trucks, portable crushing/screening equipment, and rock drill bits for construction and surface mining. Cross‑references exclude underground mining machinery (see 333131 and 333132), industrial plant cranes and hoists (see 33392), and railroad track‑laying equipment (see 336510). ²

See also on G2X:

• G2X — NAICS 333120 overview
• G2X — NAICS 333131
• G2X — PSC 3805

What this NAICS covers

• Heavy earthmoving equipment such as bulldozers, backhoes, excavators, and graders. ²
• Construction‑type tractors and attachments (e.g., dozer blades, loaders). ²
• Off‑highway trucks and haulers for construction and surface mining. ²
• Pile‑driving and foundation machinery. ²
• Portable crushing, pulverizing, and screening plants. ²
• Rock drill bits designed for construction and surface mining applications. ²
• Logging machinery classified with construction/surface mining equipment. ²

Related NAICS and PSC codes

Type	Code	Descriptor
NAICS	333131	Mining Machinery and Equipment Manufacturing
NAICS	333924	Industrial Truck, Tractor, Trailer, and Stacker Machinery Manufacturing
PSC	3805	Earth Moving and Excavating Equipment
PSC	3810	Cranes and Crane‑Shovels

Common cross‑references and exclusions

• Underground mining and oil/gas field machinery are classified in 333131 and 333132, not in 333120. ²
• Industrial plant overhead traveling cranes, hoists, truck‑type cranes/hoists, winches, and aerial work platforms fall under 33392. ²
• Rail layers, ballast distributors, and other track‑laying equipment are classified in 336510, not 333120. ²

SBA size standard (Manufacturing)

• The SBA small business size standard for 333120 is 1,250 employees (effective March 17, 2023). ³

Frequently asked questions

• What does NAICS 333120 include?

  • It includes manufacturing of construction machinery, surface mining machinery, and logging equipment such as bulldozers, backhoes, graders, pile drivers, off‑highway trucks, and portable crushing/screening plants. ²

• What equipment is excluded from 333120?

  • Underground mining and oil/gas field machinery are excluded (see 333131 and 333132), as are industrial plant cranes/hoists (see 33392) and railroad track‑laying equipment (see 336510). ²

• What is the SBA small business size standard for 333120?

  • SBA sets the size standard at 1,250 employees for this manufacturing industry. Contracting officers apply SBA’s table of size standards when designating NAICS codes for solicitations. ³

• How are 2022 NAICS vintages used in federal statistics?

  • Census programs are transitioning publications to the 2022 NAICS vintage; the Economic Census began releasing 2022‑based data in 2024, with full adoption targeted by 2027 for most programs. ¹

• Which PSC codes commonly align with 333120 supply buys?

  • Federal supply purchases for heavy construction machinery often use FSG 38 PSCs such as 3805, 3810, 3820, and 3825, per the official PSC Manual. ⁴

Useful resources

• U.S. Census Bureau: Economic Census guidance — NAICS and 2022 vintage usage. ¹
• U.S. Census Bureau: NAICS 333120 industry description and cross‑references. ²
• SBA: Table of Small Business Size Standards (effective March 17, 2023). ³
• Acquisition.gov: Product and Service Code (PSC) Manual. ⁴

References

1. U.S. Census Bureau — Economic Census: NAICS Codes & Understanding Industry Classification Systems. https://www.census.gov/programs-surveys/economic-census/year/2022/technical-documentation/code-lists/understanding-naics-redirect.html
2. U.S. Census Bureau — NAICS 2022 Code 333120: Construction Machinery Manufacturing. https://www.census.gov/naics/?input=333120&year=2022&details=333120
3. U.S. Small Business Administration — Table of Small Business Size Standards (effective March 17, 2023). https://www.sba.gov/sites/default/files/2023-06/Table%20of%20Size%20Standards_Effective%20March%2017%2C%202023%20%282%29.pdf
4. Acquisition.gov — Product and Service Code (PSC) Manual, April 2025. https://www.acquisition.gov/psc-manual/all