Top Sand Casting Manufacturers in the US (2026)

Picking a sand casting supplier isn’t like picking a vendor off a directory list. The wrong fit costs you in scrapped tolerances, missed lead times, or a foundry that can’t scale with you past prototype volume. This list is built for engineers, procurement leads, and OEM buyers who need to shortlist real candidates fast, not browse a popularity contest. Below, each foundry is evaluated on alloy focus, certifications, documented part-size range, and the industries it actually serves, so you can match a supplier to your part instead of your part to whoever ranks highest. Demand for casting capacity is also rising: the American Foundry Society projects casting sales growth of 4.2% in 2026, which makes locking in the right supplier relationship sooner rather than later worth the extra diligence.

How We Selected These Manufacturers

We looked at company history and ownership stability, quality certifications (ISO 9001:2015, AS9100D, ITAR where relevant), documented capacity and part-size range, alloy and process specialization, and the industries each foundry actually serves. A few of these companies appear on public click-share or directory rankings, which we call out below because those metrics measure search visibility, not casting quality.

1. LeClaire Manufacturing

LeClaire Manufacturing, based in Bettendorf, Iowa, has poured aluminum castings since 1966 and is a single-source supplier: aluminum green sand casting, permanent mold casting, CNC machining, tool and die, and prototyping all under one roof. That matters for buyers who want one accountable partner instead of coordinating a foundry, a machine shop, and a tool builder separately.

• Certifications: ISO 9001:2015, AFS member
• Alloys: 200, 300, 500, and 700 series aluminum
• Capabilities: automated green sand molding, robotic ladling, single-cylinder to 18-piece core assemblies, in-house heat treat, real-time X-ray, casting solidification simulation
• Industries served: agriculture, RV, heavy truck, marine, railroad, valves and pumps, military and defense, engine components
• Ranked #1 in Metoree’s US sand casting index by click share (16.4%, January 2026) — a visibility metric, not a quality benchmark, but a sign of how often buyers researching this category land on LeClaire

2. Waupaca Foundry

Waupaca Foundry, headquartered in Waupaca, Wisconsin, is North America’s largest iron foundry, melting roughly 9,500 tons of iron a day across its plants. It runs gray, ductile, austempered ductile, and compacted graphite iron, and has invested in a Sinto horizontal molding line (200 molds per hour, 18-second pattern changes) paired with an ExOne S-Max Pro 3D sand core printer. Waupaca mainly serves automotive, commercial vehicle, agriculture, and construction customers, and is a strong fit for high-volume iron programs rather than aluminum work.

3. Consolidated Precision Products (CPP)

CPP, headquartered in Cleveland, Ohio, is one of the largest aerospace casting suppliers in the world, running both sand and investment casting in aluminum, magnesium, titanium, steel, and superalloys across 20-plus global facilities. Its castings show up on Boeing 737, 777, and 787 programs, Airbus A320, A340, and A380 platforms, and the F-35. CPP-Minneapolis specializes in large aerospace precision sand castings such as gearbox and transmission housings and airframe structures, making CPP the pick for aerospace-grade traceability over general industrial work.

4. Charlotte Pipe & Foundry

Family-owned since 1901, Charlotte Pipe & Foundry operates one of the world’s largest and most modern cast iron foundries, including a newer plant in Oakboro, North Carolina. Its focus is cast iron pipe and fittings, a narrower but deep specialization compared to the multi-industry foundries on this list.

5. Neenah Foundry

Neenah Foundry has poured gray and ductile iron for more than 150 years from Neenah, Wisconsin, and is best known for infrastructure castings: manhole frames and covers, grates, and utility products. It’s a strong reference point for municipal and infrastructure buyers rather than OEM component work.

6. Erie Bronze & Aluminum

Based in Erie, Pennsylvania, Erie Bronze & Aluminum casts non-ferrous bronze and aluminum parts and holds ITAR registration for defense work. It runs a DISA MATCH 20/24 automated green sand molding line, which puts it in a similar automation class to larger foundries despite a more specialized alloy focus.

7. Bremen Castings

Bremen Castings, in Bremen, Indiana, is a family-owned, vertically integrated iron sand casting operation with in-house machining. It primarily serves heavy truck, refrigeration, and energy customers, and its vertical integration mirrors the single-source model buyers increasingly look for.

8. Badger Alloys

Badger Alloys, in Milwaukee, Wisconsin, runs airset and no-bake molding with in-house sand reclamation, serving valves, defense, water treatment, chemical, oil and gas, and food and beverage customers. No-bake molding gives it tighter dimensional control than standard green sand, which matters for pressure-retaining parts.

9. Bunty LLC

Bunty LLC, headquartered in Greenville, South Carolina, holds both AS9100D and ISO 9001:2015 certification and serves aerospace, automotive, energy, and medical customers, an unusually broad certification and industry spread for a foundry of its size.

10. Willman Industries

Willman Industries, based in Cedar Grove, Wisconsin, casts gray and ductile iron in green sand and can scale prototype volumes up to 10,000-plus units a year, making it a useful option for buyers moving from prototype to production without changing suppliers.

11. Le Sueur Incorporated

Le Sueur Incorporated, established in 1946 in Le Sueur, Minnesota, runs permanent mold, die, sand, and plastic injection casting under ISO 9001:2015, ITAR, and UL certifications. Its dedicated sand lab monitors moisture and compactability on every batch, a level of process control worth asking about when you compare quotes.

Comparing These Sand Casting Manufacturers

Frequently Asked Questions

What is the largest sand casting manufacturer in the US?

By tonnage, Waupaca Foundry is the largest US iron foundry, melting roughly 9,500 tons a day. For aluminum sand casting specifically, LeClaire Manufacturing ranks #1 by search click share in industry directories as of January 2026.

How do I choose between these sand casting manufacturers?

Start with your alloy: iron foundries like Waupaca and Neenah won’t be the right fit for an aluminum part, and vice versa. From there, narrow by part size, required certifications (ISO, AS9100D, ITAR), and whether you need machining and tooling under one roof or plan to manage those separately.

Is a higher-ranked foundry always the better choice?

No. These lists reflect visibility and capability data, not a tested quality score. A smaller specialist foundry with the right alloy expertise and certifications for your part can be a better fit than a larger, more visible one.

Do sand casting manufacturers also offer machining and tooling?

Some do. LeClaire Manufacturing, Bremen Castings, and Le Sueur Incorporated all combine casting with in-house machining or tooling, which reduces the number of vendors you need to manage and shortens overall lead time.

What industries rely most on sand casting?

Agriculture, heavy truck, marine, railroad, valves and pumps, military and defense, and engine components are among the heaviest users, largely because sand casting handles large parts and low-to-mid production volumes economically.

Conclusion

Sand casting remains the most flexible process for large, low-to-mid-volume metal parts, and the US supplier base spans everything from single-alloy specialists to full-service, multi-process foundries. LeClaire Manufacturing’s combination of aluminum casting, machining, and tooling under one roof makes it a practical starting point for OEM buyers who want fewer vendors and more accountability.

Ready to see if LeClaire is the right fit for your next casting? Request a quote from LeClaire Manufacturing’s engineering team and get a straight answer on tooling, lead time, and cost.