U.S. Other Nonferrous Metal Foundries (Except Die-Casting): NAICS 331529 Investor Primer [1]
1. Overview
This industry melts copper, nickel, zinc, lead and other non-aluminum alloys, then pours the metal into molds to make industrial components. Products range from bronze pump bodies to nickel-superalloy turbine blades. "Other" is a classification label, not an indication that the products are unimportant.
Investors can participate through:
- Public companies with precision-casting operations, although most also own forging, machining or materials businesses.
- Private acquisitions of regional foundries and specialist aerospace suppliers.
- Private credit, equipment finance and sale-leasebacks for capital-intensive plants.
- Suppliers of furnaces, tooling, consumables, testing and automation.
The central investment question is whether a foundry can keep qualified capacity full while controlling alloy costs, scrap, rework and capital spending.
2. What It Is and Industry Structure
The North American Industry Classification System (NAICS) code 331529 covers establishments pouring molten nonferrous metals other than aluminum into molds, excluding die-casting. Common processes include sand, permanent-mold, centrifugal and investment casting.[1]
In practice, the code contains two rather different businesses. The first is copper-alloy casting: brass, bronze, copper-nickel and bearing alloys used in pumps, valves, bushings, bearings, marine hardware, propellers, chemical equipment and water or power infrastructure. Copper alloys remain attractive where corrosion, cavitation, friction and seawater performance matter.[18][19] The second is high-specification casting in nickel-, cobalt-, titanium- and other specialty alloys, with principal products including turbine blades and vanes, structural castings and other hot-section components for aircraft engines and industrial gas turbines.[6]
Important exclusions under the 2022 classification are:
- Nonferrous die-casting: NAICS 331523.
- Aluminum foundries other than die-casting: NAICS 331524.
- Iron and steel foundries: NAICS 331511–331513.
- Nonferrous forging: NAICS 332112.[1]
An integrated manufacturer that casts a component and then turns it into a different finished product at the same establishment may be classified under that finished product rather than as a foundry.[1] Consequently, NAICS data do not capture every captive casting operation.
Ownership is mixed. It includes public industrial groups, private-equity-backed aerospace suppliers, family-owned regional foundries and captive plants inside original equipment manufacturers (OEMs). High-specification aerospace and turbine work is more concentrated than ordinary copper- and bronze-casting work.
3. How Big It Is
The latest narrow federal snapshot located is the U.S. Census Bureau's 2023 County Business Patterns (CBP) row:[2]
| Metric | U.S. total |
|---|---|
| Employer establishments | 240 [2] |
| Employees | 9,184 [2] |
| First-quarter payroll | $152.651 million [2] |
| Annual payroll | $613.598 million [2] |
These are establishment statistics, not enterprise counts. Census publishes the values rather than suppressing them, although the employment and payroll fields carry statistical noise flags.[2]
The U.S. Small Business Administration (SBA) size standard for this industry is 500 employees, meaning a company below that threshold generally qualifies as small for relevant federal programs.[4]
The specified stats-331529.md file was absent from the supplied workspace. To avoid inventing values, the table above reproduces the underlying federal CBP row. No current federal industry-revenue, shipment, firm-count, capacity-utilization or concentration figure was available in the supplied material, so none is stated.
CBP excludes nonemployers, most government activity and some other categories.[3] Tiny operators and government facilities are unlikely to dominate this furnace-intensive industry; the more important blind spot is captive casting classified with a downstream finished product.
4. Investable Universe
New York Stock Exchange (NYSE) listings provide several levels of exposure:
| Company | Ticker | Relevant scale and exposure |
|---|---|---|
| DPC Holdings, parent of Doncasters | NYSE: DPC | Closest listed operating proxy. Fiscal 2025 revenue was $837 million; aerospace and industrial gas turbines produced 77% of revenue. Its June 2026 IPO sold 27,858,585 shares at $33 each for approximately $919.3 million before expenses. It remains a global, mixed-operation company rather than a pure U.S. NAICS proxy.[5][6][20] |
| Howmet Aerospace | NYSE: HWM | Its Engine Products segment reported $4.320 billion of 2025 third-party sales. The segment combines investment castings with seamless rolled rings and other products.[7] |
| ATI | NYSE: ATI | Reported $4.587 billion of 2025 sales; precision forgings, castings and components together represented 22% of revenue. Casting exposure is therefore diluted and not separately disclosed.[8] |
| Berkshire Hathaway | NYSE: BRK.A, BRK.B | Owns Precision Castparts. Precision Castparts reported approximately $10.8 billion of 2025 revenue but also produces forgings, fasteners, aerostructures and specialty materials.[9] |
| Impro Precision Industries | HKEX: 1286 | International exposure to investment casting, sand casting, machining and surface treatment. It is not a U.S. pure play, but its integrated precision-manufacturing model is relevant to the industry's higher-value end.[21] |
Corporate segment revenue should not be treated as NAICS 331529 industry revenue: the segments include foreign production, excluded metals and adjacent manufacturing processes.
Major private operators and owners include:
- Consolidated Precision Products, an aerospace and industrial investment-casting group backed by Warburg Pincus and Berkshire Partners.[10]
- Signicast, owned through Form Technologies, in which Ares Management funds acquired a majority interest in 2025. Form also owns excluded die-casting and metal-injection-molding businesses.[11]
- Winsert, an Altus Capital Partners portfolio company specializing in heat-, wear- and corrosion-resistant alloys.[12]
- MetalTek International, a privately held, multi-process casting group with copper-, nickel- and other alloy capabilities.[13]
5. How the Money Works
Revenue normally comes from production parts plus tooling, machining, heat treatment, inspection and testing. Aerospace and turbine suppliers frequently operate under long-term agreements (LTAs). Doncasters reported that approximately 70% of its 2025 revenue was covered by LTAs.[6]
The principal costs are alloy, energy, skilled labor, molds and ceramic materials, maintenance, outside processing, scrap and rework. Nickel, cobalt and other specialty inputs can be volatile. Contractual surcharges and indexation reduce exposure, but resets may lag actual purchase costs.[6]
Foundries have substantial fixed costs. Furnaces, environmental systems, metallurgical laboratories and qualified personnel must be maintained whether production is high or low. Incremental volume can therefore produce strong operating leverage; falling utilization can reverse it quickly.
Output pricing has recently moved materially. The BLS primary-products PPI for 331529 increased from 154.544 in December 2024 to 171.950 in December 2025 and 187.637 in May 2026, on a December 2003 base of 100.[22] Howmet's Engine Products segment achieved a 33.3% adjusted EBITDA margin in 2025, up from 30.8% in 2024, illustrating the operating leverage available to high-utilization specialty suppliers.[23]
The most useful operating indicators are:
- Furnace and bottleneck utilization.
- Melt yield, scrap and rework rates.
- Throughput, cycle time and on-time delivery.
- Price escalation versus alloy, labor and energy inflation.
- Equipment uptime and maintenance backlog.
- Qualification progress for new parts and capacity.
- Maintenance versus expansion capital expenditure.
- Customer and program concentration.
- Earnings before interest, taxes, depreciation and amortization (EBITDA) converted into cash after working capital and capital spending.
No narrow federal capacity-utilization series exists for this specific code, so plant-level measures are more informative than broad metal-fabrication averages.
6. Demand Drivers
Aerospace is driven by aircraft production, engine build rates, spare parts and maintenance. Cast turbine components are difficult to substitute after certification, giving qualified suppliers recurring aftermarket demand.
Industrial gas turbines benefit from electricity demand, grid investment, replacement parts and new generating capacity. Doncasters derives most of its business from aerospace and industrial gas turbines, while Howmet reported 16% growth in Engine Products sales during 2025.[6][7]
Copper-alloy demand is less spectacular but diversified. Naval vessels, desalination, offshore energy, chemical plants and water infrastructure use copper-nickel and bronze castings because of their corrosion, biofouling, cavitation and bearing properties. Defense shipbuilding can support both copper-alloy marine components and high-temperature engine castings.[24]
Other end markets include defense, marine equipment, pumps, valves, turbochargers, mining machinery and process equipment. Copper- and bronze-alloy foundries tend to have broader but more cyclical industrial exposure than aerospace-focused nickel-alloy specialists.[6][13]
Additive manufacturing is commonly mischaracterized as purely a substitute. Printed sand molds and cores eliminate conventional tooling, shorten prototype and low-volume lead times and enable geometries that are difficult to core conventionally—while the final part is still a casting. Direct-metal printing competes with casting in some low-volume, high-complexity applications, but printed tooling can strengthen the competitiveness of foundries that adopt it.[25][26]
7. Regulation
Covered facilities face the Environmental Protection Agency's National Emission Standards for Hazardous Air Pollutants under Title 40, Part 63 of the Code of Federal Regulations. The rule addresses metal-bearing particulate emissions from aluminum, copper and other nonferrous foundries.[14]
EPA's metal-molding and casting effluent guidelines under 40 CFR Part 464 regulate pollutants from quenching, scrubbers, cooling and related wastewater. Legacy plants may carry soil, groundwater, baghouse-dust or used-sand liabilities that make waste handling materially more expensive.[27]
Sand handling can expose workers to respirable crystalline silica. The Occupational Safety and Health Administration (OSHA) general-industry permissible exposure limit is 50 micrograms per cubic meter as an eight-hour time-weighted average.[15] Lead, beryllium, molten metal, heat and powered equipment create additional worker-safety obligations.
Aerospace suppliers commonly require the AS9100 aerospace quality standard, customer part approvals and Nadcap—originally the National Aerospace and Defense Contractors Accreditation Program—accreditation for designated special processes.[6] Defense work may also be subject to the Defense Federal Acquisition Regulation Supplement (DFARS) specialty-metals sourcing clause.[16]
Section 232 tariffs can protect domestic foundries while also raising the cost of imported alloys, machinery and components. Current treatment varies by Harmonized Tariff Schedule code, country of origin and effective date; investors should model the actual sourcing chain rather than apply a single headline tariff.[17]
8. Competitive Dynamics and Consolidation
In high-temperature aerospace and turbine castings, the principal scaled suppliers include Doncasters, Howmet, Precision Castparts and Consolidated Precision Products.[6][7] Regional copper-, bronze- and mixed-alloy markets are more fragmented.
Competitive advantages come from:
- Metallurgical and process expertise.
- Customer-qualified tooling and part approvals.
- Consistent yield and defect control.
- Available bottleneck capacity.
- Machining, coating and testing capabilities.
- Reliable delivery and traceability records.
- The capital and patience to qualify new lines.
Changing suppliers can require new tooling, audits, testing and customer approval. This makes qualification a real barrier, but not a guarantee of attractive returns: poor yield or underused capacity can overwhelm switching-cost advantages.
Consolidation remains active. Consolidated Precision Products has expanded through acquisitions, while Ares acquired control of Form Technologies in 2025. Doncasters moved from private ownership to the public market in 2026.[5][10][11] Likely acquisition targets are specialized foundries with customer approvals, scarce capacity or complementary machining—not merely inexpensive furnaces.
9. Risks
- Cyclicality and fixed costs: Aircraft, turbine and industrial downturns can sharply reduce plant profitability.
- Customer concentration: Doncasters' ten largest customers supplied 68% of 2025 revenue, including 38% from its two largest customers.[6]
- Metal-cost timing: Surcharges may not fully or immediately offset alloy inflation.
- Quality failures: Defects can cause scrap, delivery penalties, recalls, lost qualifications or liability claims.
- Capacity execution: New furnaces and casting lines can take time to stabilize at acceptable yields.
- Capital intensity: Reported EBITDA can overstate owner earnings when maintenance and environmental spending are heavy.
- Labor constraints: Skilled metallurgists, mold technicians, maintenance staff and inspectors are difficult to replace. BLS reported a 2022 recordable injury and illness incidence rate of 4.5 cases per 100 full-time workers for NAICS 331529, reflecting the inherent hazards of molten-metal, heat, noise and fume exposure.[28]
- Environmental liabilities: Historical waste, air emissions and contaminated sites can create obligations beyond current compliance costs.
- Technology substitution: Forging, fabrication, additive manufacturing or alternative alloys may displace selected cast parts.
- Trade and geopolitical exposure: Tariffs, sanctions and shortages can disrupt alloy supply or customer production.
- Private-company leverage: Acquisition debt can turn ordinary operating volatility into refinancing risk.
- Plant disruption: Customer qualification is a moat and a concentration risk. A quality escape, furnace outage, failed audit or plant fire can interrupt an entire customer program. Berkshire disclosed that a February 2025 fire at Precision Castparts' Jenkintown facility affected more than 700 sole-sourced parts considered critical by aerospace customers.[29]
10. How to Invest and Outlook
Public investors can choose among relatively direct Doncasters exposure, Howmet's larger precision-component platform, or more diversified exposure through ATI and Berkshire Hathaway. Impro Precision offers international exposure to integrated precision manufacturing. The trade-off is purity versus scale, balance-sheet strength and business diversification.
Private investors can pursue control acquisitions, minority growth capital, private credit or equipment financing. Due diligence should reconcile revenue by alloy, process, plant and end market; separate in-scope casting from forging, aluminum and die-casting; and test every major contract for volume commitments, escalation clauses and termination rights.
Plant visits should focus on bottleneck capacity, yield, rework, maintenance condition, environmental history and the distinction between maintenance and expansion capital. Backlog should be discounted when it lacks firm quantities or customer penalties.
The most common analytical mistake is to buy or value "the NAICS industry" as though it were homogeneous. A qualified turbine-airfoil supplier, a marine-bronze centrifugal caster and a small jobbing foundry may share the same code while having radically different margins, cyclicality, capital needs and competitive moats.
Reported outlook: Howmet entered 2026 expecting continued aerospace and gas-turbine demand growth, while Doncasters described key markets as capacity-constrained.[6][7]
Investment judgment: The medium-term setup is constructive for qualified nickel-alloy and turbine-component suppliers, but it is not uniformly bullish for the entire code. Returns will depend less on nominal demand than on utilization, yield, pricing discipline and capital execution. New capacity may eventually ease shortages and normalize pricing. For private transactions in particular, a strong customer list should not substitute for plant-level evidence of sustainable free cash flow.
Sources
- U.S. Census Bureau, "2022 NAICS Manual: Other Nonferrous Metal Foundries (except Die-Casting)," 2022, https://www.census.gov/naics/reference_files_tools/2022_NAICS_Manual.pdf
- U.S. Census Bureau, "2023 County Business Patterns: United States Summary," 2025, https://www2.census.gov/programs-surveys/cbp/datasets/2023/cbp23us.zip
- U.S. Census Bureau, "County Business Patterns Methodology," 2025, https://www.census.gov/programs-surveys/cbp/technical-documentation/methodology.html
- U.S. Small Business Administration, "Table of Size Standards," 2023, https://www.sba.gov/document/support-table-size-standards
- DPC Holdings, "Doncasters Announces Pricing of Upsized Initial Public Offering," 2026, https://ir.doncasters.com/news-and-events/news/news-details/2026/Doncasters-Announces-Pricing-of-Upsized-Initial-Public-Offering/default.aspx
- DPC Holdings and U.S. Securities and Exchange Commission, "Registration Statement on Form S-1/A," 2026, https://www.sec.gov/Archives/edgar/data/2107018/000110465926073752/tm269965-6_s1a.htm
- Howmet Aerospace and U.S. Securities and Exchange Commission, "Annual Report on Form 10-K for Fiscal 2025," 2026, https://www.sec.gov/Archives/edgar/data/4281/000000428126000012/hwm-20251231.htm
- ATI and U.S. Securities and Exchange Commission, "Annual Report on Form 10-K for Fiscal 2025," 2026, https://www.sec.gov/Archives/edgar/data/1018963/000162828026010140/ati-20251228.htm
- Berkshire Hathaway, "2025 Annual Report," 2026, https://berkshirehathaway.com/2025ar/2025ar.pdf
- Warburg Pincus, "Consolidated Precision Products," 2026, https://warburgpincus.com/investments/consolidated-precision-products/
- Form Technologies, "Investor Center," 2025, https://www.formtechnologies.com/investor-center
- Winsert, "Winsert Acquired by Altus Capital Partners," 2022, https://www.winsert.com/press-releases/winsert-acquired-by-altus-capital-partners/
- MetalTek International, "Casting Capabilities and Divisions," 2026, https://www.metaltek.com/divisions/
- U.S. Environmental Protection Agency, "Aluminum, Copper, and Other Nonferrous Foundries: National Emission Standards for Hazardous Air Pollutants," 2025, https://www.epa.gov/stationary-sources-air-pollution/aluminum-copper-and-other-nonferrous-foundries-national-emission
- Occupational Safety and Health Administration, "Respirable Crystalline Silica Standard for General Industry," 2026, https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1053
- U.S. Department of Defense, "DFARS 252.225-7009: Restriction on Acquisition of Certain Articles Containing Specialty Metals," 2026, https://www.acquisition.gov/dfars/252.225-7009-restriction-acquisition-certain-articles-containing-specialty-metals
- White House, "Further Adjusting the Tariff Regimes for Imports of Aluminum, Steel, and Copper into the United States," 2026, https://www.whitehouse.gov/presidential-actions/2026/06/further-adjusting-the-tariff-regimes-for-imports-of-aluminum-steel-and-copper-into-the-united-states/
- Copper Development Association, "Copper-Nickel Alloys: Properties and Applications," 2026, https://www.copper.org/applications/marine/cuni/properties/DKI_booklet.php
- Copper Development Association, "Aluminum Bronzes: Properties and Applications," 2026, https://copper.org/resources/properties/microstructure/al_bronzes.php
- Nasdaq, "Doncasters Announces Pricing of Upsized Initial Public Offering," 2026, https://www.nasdaq.com/press-release/doncasters-announces-pricing-upsized-initial-public-offering-2026-06-25
- Impro Precision Industries, "Financial Information," 2026, https://www.improprecision.com/investors/financial-information/
- Federal Reserve Bank of St. Louis, "Producer Price Index: NAICS 331529 Primary Products," 2026, https://fred.stlouisfed.org/data/PCU331529331529P
- Howmet Aerospace, "Fourth Quarter and Full Year 2025 Results," 2026, https://www.sec.gov/Archives/edgar/data/4281/000110465926013832/tm266060d1_ex99-1.htm
- Copper Development Association, "Copper Alloys for Marine Environments," 2026, https://live.copper.org/applications/marine/cuni/alloys/pub-206-copper-alloys-for-marine-environments.pdf
- American Foundry Society, "2026 Additive Manufacturing Conference," 2026, https://www.afsinc.org/conferences/2026-additive-manufacturing-conference
- American Foundry Society, "Design Optimization for 3D Sand Printing," 2026, https://www.afsinc.org/courses/design-optimization-3d-sand-printing
- U.S. Environmental Protection Agency, "Metal Molding and Casting (Foundries) Effluent Guidelines," 2026, https://www.epa.gov/eg/metal-molding-and-casting-foundries-effluent-guidelines
- U.S. Bureau of Labor Statistics, "Table 1: Incidence Rates of Nonfatal Occupational Injuries and Illnesses by Industry, 2022," 2023, https://www.bls.gov/iif/nonfatal-injuries-and-illnesses-tables/table-1-injury-and-illness-rates-by-industry-2022-national.htm
- Berkshire Hathaway and U.S. Securities and Exchange Commission, "Annual Report on Form 10-K for Fiscal 2025," 2026, https://www.sec.gov/Archives/edgar/data/1067983/000119312526083899/brka-20251231.htm