NAICS 333611

Overview

The North American Industry Classification System (NAICS) organizes U.S., Canadian, and Mexican industries by production processes to support consistent statistical collection, analysis, and publication across federal programs. Developed under the Office of Management and Budget and adopted in 1997 to replace SIC, the current standard used for the Economic Census is the 2022 NAICS vintage. ¹
NAICS 333611 covers establishments primarily engaged in manufacturing turbines (excluding aircraft) and complete turbine generator set units, including steam, hydraulic (water), gas, and wind turbines. Generators or prime-mover generator sets that are not turbine-based fall under different industries. ²

What this NAICS covers

• Design and manufacture of industrial gas turbines for power generation and mechanical drive applications. ²
• Production of steam turbines for utility and industrial power systems. ²
• Manufacture of hydraulic (water) turbines for hydroelectric generation. ²
• Fabrication of wind turbines and complete wind turbine generator units. ²
• Integration and manufacture of complete turbine generator set units (steam, gas, hydraulic, wind). ²
• Assembly and testing of turbine-driven generator packages delivered as complete sets. ²

Related NAICS and PSC codes

Key exclusions and boundary guidance

• Aircraft turbines are excluded from NAICS 333611 and classified under NAICS 336412. ²
• Generators or prime-mover generator sets that are not turbine-based are classified under NAICS 335312. ²

PSC alignment for common turbine products

• Steam turbines and components are represented by PSC 2825. ⁵
• Water turbines and water wheels are represented by PSC 2830. ⁵
• Non-aircraft gas turbines (e.g., industrial/shipboard) are represented by PSC 2835. ⁵
• Generators and generator sets, including turbine-driven sets, are represented by PSC 6115. ⁵

2022 NAICS adoption notes

Census programs began releasing data on the 2022 NAICS basis with 2022 Economic Census “First Look” products in 2024, with full adoption across programs planned by the end of 2027 (some survey exceptions later). Use 2022 NAICS for current official industry statistics. ³

Frequently asked questions

• What products are included in NAICS 333611?
  Establishments in NAICS 333611 manufacture turbines—steam, gas, hydraulic/water, and wind—as well as complete turbine generator set units. Aircraft turbines are excluded and classified elsewhere (see NAICS 336412). ²

• Are wind turbine manufacturers classified under 333611?
  Yes. Manufacturers of wind turbines and complete wind turbine generator sets are included in NAICS 333611. Related balance-of-plant equipment (e.g., towers, blades) may fall under other NAICS codes depending on production processes. Always align with the primary manufacturing activity. ²

• Which PSC codes often appear on turbine hardware buys?
  Common product PSCs include 2825 (steam turbines), 2830 (water turbines), 2835 (non-aircraft gas turbines), and 6115 (generators/generator sets). Select the PSC that best matches the predominant end item being procured. ⁵

• Where are the current SBA size standards for 333611?
  SBA publishes size standards matched to NAICS codes; consult the Table of Small Business Size Standards for the current value applicable to NAICS 333611. The table is periodically updated; use the edition effective on your solicitation’s date. ⁶

• Is installation or repair work included in NAICS 333611?
  NAICS 333611 defines a manufacturing industry by production processes. Installation, maintenance, or repair services are typically classified in service industries rather than manufacturing. Not specified by official sources ².

Useful resources

• G2X — NAICS 333611 overview: https://app.g2xchange.com/naics/333611
• Census NAICS definition for 333611 (Manufacturing Sector 31–33 archive entry). ²
• Census implementation of 2022 NAICS and adoption timeline. ³
• PSC Manual (April 2025 edition) for product code definitions (e.g., 2825/2830/2835/6115). ⁵
• SBA Table of Small Business Size Standards (matched to NAICS). ⁶

References

1. U.S. Census Bureau — 2017 NAICS Manual page with official NAICS overview and history (OMB, 1997 adoption). https://www.census.gov/library/publications/2017/econ/2017-naics-manual.html
2. U.S. Census Bureau — NAICS Manufacturing (Sector 31–33) archive entry including 333611 definition and cross-references. https://www.census.gov/naics/resources/archives/sect31-33.html
3. U.S. Census Bureau — Implementation of the 2022 NAICS (timeline and program adoption). https://www.census.gov/library/reference/code-lists/naics/2022/implementation-timeline.html
4. General Services Administration — Product and Service Code (PSC) Manual, April 2025 (Section D: Product Codes, Groups 28 and 61). https://www.acquisition.gov/sites/default/files/manual/PSC%20Manual%20April%202025.pdf
5. U.S. Small Business Administration — Table of Small Business Size Standards (matched to NAICS). https://www.sba.gov/document/support--table-size-standards