Manufacturing › Primary Metal Manufacturing › Foundries
Sector
Manufacturing
Subsector
Primary Metal Manufacturing
Industry Group
Foundries
National Industry (This Code)
Iron Foundries
Source: U.S. Census Bureau 2022 NAICS
Based on SBA Table of Small Business Size Standards (2024)
Size Standard
1,000 employees
Measurement Period
Current count
Standard Type
Employee-Based
Applies To
All contracts under NAICS 331511
Set-Aside Programs
8(a), WOSB, HUBZone, SDVOSB
Certification Required
No (self-certify in SAM.gov)
Size standards are set by the SBA and reviewed periodically. Always verify at SBA.gov before bidding.
The following activities are classified elsewhere in the NAICS system:
NAICS code 331511 — Iron Foundries — is used in SAM.gov to identify businesses whose primary activity falls within this classification. When you add this code to your SAM.gov entity registration, contracting officers searching for vendors in the Foundries space will be able to find your business.
If this code represents your primary business activity, designate it as your primary NAICS code. Your primary NAICS code determines your size standard for any contract solicited under this code. With a size standard of 1,000 employees, your business must be at or below this threshold to qualify as a small business for set-aside contracts under NAICS 331511.
NAICS code 331511 is 'Iron Foundries', classified under the Manufacturing sector (NAICS 33). This U.S. industry comprises establishments primarily engaged in pouring molten pig iron or iron alloys into molds to manufacture castings (e.g., cast iron manhole covers, cast iron pipe, cast iron sk
The SBA defines a small business under NAICS code 331511 (Iron Foundries) as one with 1,000 employees. This size standard determines eligibility for small business set-aside contracts, 8(a), HUBZone, WOSB, and SDVOSB programs in SAM.gov.
To register NAICS code 331511 in SAM.gov: (1) Log in at sam.gov, (2) Navigate to your Entity Registration, (3) Go to the Assertions section, (4) Add 331511 (Iron Foundries) to your NAICS code list. You may designate one code as your Primary NAICS code.
Other codes in Foundries
PSC codes commonly used with this NAICS sector
Source: GSA PSC Manual April 2025
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