NAICS 2022 nationalIndustry USA Verified: Census NAICS 2022 · 2026-01-01
331511
NAICS 331511 — Iron Foundries
Iron Foundries
NAICS 331511 is the national industry code for iron foundries establishments in the United States. The Small Business Administration sets a size standard of 1,000 for this classification. It forms part of the hierarchical North American Industry Classification System maintained by the Census Bureau.
SBA: 1,000
View full SBA standard
Related industries in 33151 (Ferrous Metal Foundries)
View parent 33151Official Illustrative Examples
Primary activities officially recognized by Census Bureau / Statistics Canada:
cast iron soil or pressure pipe and fittings, manufacturing castings, unfinished, iron (e.g., ductile, grey, malleable, semisteel), manufacturing engine block castings, iron, unfinished, manufacturing grinding balls, cast iron, manufacturing hydrants, unfinished iron castings, manufacturing industrial moulds for casting steel ingots, manufacturing
Complete Index of Activities (21 recognized activities) ▼
cast iron brake shoes, railroad, manufacturing
cast iron pipe and pipe fittings, manufacturing
cast iron railroad car wheels, manufacturing
cast iron soil or pressure pipe and fittings, manufacturing
castings, unfinished, compacted graphite iron, manufacturing
castings, unfinished, iron (e.g., ductile, grey, malleable, semisteel), manufacturing
engine block castings, iron, unfinished, manufacturing
fittings, soil and pressure pipe, cast iron, manufacturing
foundries, iron (i.e., ductile, grey, malleable, semisteel)
grinding balls, cast iron, manufacturing
hydrants, unfinished iron castings, manufacturing
industrial moulds for casting steel ingots, manufacturing
iron castings, unfinished, manufacturing
manhole covers, cast iron, manufacturing
municipal castings (manhole covers, sewer gratings), iron, manufacturing
pearlitic castings, malleable iron, unfinished, manufacturing
pipe couplings, cast iron, manufacturing
rolling mill rolls, iron, manufacturing
sewer pipe, cast iron, manufacturing
soil pipe, cast iron, manufacturing
water pipe, cast iron, manufacturing
Official data
| Feature | Description |
|---|---|
| Official name | North American Industry Classification System (NAICS) 2022 |
| Issuing authority | U.S. Census Bureau with OMB, Statistics Canada, and INEGI |
| Tax authority | Internal Revenue Service (IRS) |
| Purpose | Statistical business classification and federal contracting (SAM.gov, SBA standards) |
| Used in | SAM.gov registration, SBA size determinations, IRS tax classification, SEC EDGAR (via SIC crosswalk) |
| Active since | 2022 (current edition) |
| Hierarchy level | Sector (2-digit) |
| Source | https://www.census.gov/naics/ |
NAICS hierarchy path
Trace the classification from the broadest sector down to this national industry code.
Cross-references & crosswalks
SBA size standard description
Iron Foundries
Changes to receipts-based standard: [object Object]
Trade codes using this NAICS
These Schedule B export codes explicitly reference NAICS 331511 in the Census trade classification files.
7303000030
SOIL PIPE OF CAST IRON
HS-6 730300
7303000060
PRESSURE PIPE, CAST IRON, INSDE DIAM LS THN 356 MM
HS-6 730300
7303000090
TUBES, PIPES AND HOLLOW PROFILES, CAST IRON, NESOI
HS-6 730300
7307110030
FITTINGS, NONMALBLE CAST IRON FOR THREADED PIPE
HS-6 730711
7307110045
FITTINGS NONMALBLE CAST-IRN FOR CST-IRON SOIL PIPE
HS-6 730711
7307110060
CAST FITTINGS OF NONMALLEABLE CAST IRON NESOI
HS-6 730711