# NAICS 331511: Iron Foundries

Breadcrumb: [NAICS codes](https://bidrover.com/naics) › [331511 Iron Foundries](https://bidrover.com/naics/331511)

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 skillets). Establishments in this industry purchase iron made in other establishments.

- NAICS code: 331511
- Title: Iron Foundries
- Sector: 31-33 Manufacturing
- Subsector: 331 Primary Metal Manufacturing
- Industry group: 3315 Foundries
- NAICS industry: 33151 Ferrous Metal Foundries
- SBA size standard: 1,000 employees
- Open bids on BidRover: 0

## Open bids (0)

No open bids cite this code right now.

## Frequently asked questions

### What is NAICS code 331511?

NAICS 331511 is "Iron Foundries" in the 2022 North American Industry Classification System, in sector 31-33 (Manufacturing). 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 skillets). Establishments in this industry purchase iron made in other establishments.

### What is the SBA size standard for NAICS 331511?

A business is small under NAICS 331511 at or below 1,000 employees, including affiliates (13 CFR 121.201). Confirm the standard named in each solicitation.

### How many government bids are open under NAICS 331511?

No open bid in BidRover cites NAICS 331511 right now. Many state and local notices do not list a NAICS code, so a keyword alert for this work catches more of them.

### How do I get alerts for NAICS 331511 bids?

Save an alert on this page. A free account gets new matching bids by weekly email; the Team plan ($19/mo) sends daily alerts with match scores, the buyer, source link and documents.

## Related NAICS codes

- [331512 Steel Investment Foundries](https://bidrover.com/naics/331512)
- [331513 Steel Foundries (except Investment)](https://bidrover.com/naics/331513)
- [331523 Nonferrous Metal Die-Casting Foundries](https://bidrover.com/naics/331523)
- [331524 Aluminum Foundries (except Die-Casting)](https://bidrover.com/naics/331524)
- [331529 Other Nonferrous Metal Foundries (except Die-Casting)](https://bidrover.com/naics/331529)

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Code titles and definitions: U.S. Census Bureau, North American Industry Classification System (NAICS), 2022 (https://www.census.gov/naics/). Size standards: U.S. Small Business Administration, Small Business Size Standards, 13 CFR 121.201, eCFR text current as of 2026-10-21 (https://www.ecfr.gov/current/title-13/section-121.201).

BidRover lists bids from official public sources. It is not an issuing authority; confirm the NAICS code and size standard named in each solicitation.