Top Aluminum Casting Manufacturers in the US (2026)

Aluminum casting suppliers aren’t interchangeable the way a general metals directory might suggest. A foundry built for 750-pound aerospace parts and one built for 5-pound permanent mold brackets can both call themselves “aluminum casting manufacturers,” but they solve very different problems. This list is for buyers sourcing aluminum castings for agriculture, RV, heavy truck, marine, defense, or engine applications who need to narrow candidates by what actually matters: part weight, alloy, certifications, and whether machining and tooling come from the same vendor. A few names on this list also share common ownership, which we flag below so you’re comparing genuinely independent options where it counts.

How We Selected These Manufacturers

We prioritized companies with a clear aluminum specialization, documented certifications (ISO 9001:2015, AS9100D, ITAR where relevant), a defined part-weight range, and real customer industries rather than generic marketing claims. Several of these foundries share ownership under the Ligon Permanent Mold Group, which we note where relevant so the list doesn’t read as more independent competitors than it actually is.

1. LeClaire Manufacturing

LeClaire Manufacturing has focused on aluminum casting since 1966, running both green sand and permanent mold processes from its Bettendorf, Iowa facility, with CNC machining and tool and die built in-house. That single-source setup is a real differentiator against foundries that pour metal and stop there.

• Certifications: ISO 9001:2015, AFS member
• Alloys: 200, 300, 500, and 700 series aluminum, including steel-inserted aluminum castings
• Capabilities: automated green sand and permanent mold casting, in-house CNC machining, tool and die, casting simulation, in-house heat treat and real-time X-ray
• Industries served: agriculture, RV, heavy truck, marine, railroad, valves and pumps, military and defense, engine components

2. Alcast Company

Alcast Company, based in Galesburg, Illinois, has run low-pressure permanent mold and sand casting (green and air-set/no-bake) for more than 50 years. It holds ISO 9001:2015 and PED 2014 certification (TÜV Rheinland of North America), casts parts from a fraction of a pound up to 350-plus pounds, and works in alloys like 319, 356, and 535. Alcast is a member of the Ligon Permanent Mold Group.

3. Stahl Specialty

Stahl Specialty, with plants in Kingsville and Warrensburg, Missouri, is one of the largest permanent and semi-permanent mold aluminum foundries in North America. Founded in 1946 and ISO 9001:2015 certified, it casts parts from 0.5 to 400 pounds and runs 80-plus CNC machining centers holding tolerances to ±0.002 inches. Its bottom-drop furnaces move parts to quench in under seven seconds, a detail that affects grain structure and mechanical properties. Stahl is also part of the Ligon Permanent Mold Group.

4. Eck Industries

Eck Industries, a fourth-generation family business in Manitowoc, Wisconsin founded in 1948, runs sand, permanent mold, shell, squeeze, and low-pressure casting under ISO 9001:2015, AS9100D, and ITAR certification. It’s the world’s leading foundry casting A206 high-strength aluminum, used in parts like final-drive housings for the Bradley Fighting Vehicle, and casts from 0.5 to 750-plus pounds for military, aviation, hybrid/EV, medical, and energy customers. Eck also collaborates with Oak Ridge National Lab on Al-Cerium high-temperature alloys.

5. US Aluminum Castings

US Aluminum Castings, in central Washington state, is AS9100D certified for aerospace work and runs green sand, dry sand, and permanent mold casting with in-house heat treat, machining, powder coat, and non-destructive testing. Its aerospace and defense focus makes it a strong reference for buyers who need full traceability documentation.

6. Premier Aluminum

Premier Aluminum has run permanent mold aluminum casting for nearly four decades, handling parts from 1 to 125 pounds with gravity die casting and helium leak testing. It’s another Ligon Permanent Mold Group member, positioned for small-to-mid-size precision parts.

7. CPP-Cudahy

CPP-Cudahy, part of Consolidated Precision Products’ network in Cudahy, California, casts sand and permanent mold aluminum parts specifically for aerospace and defense customers, giving it a narrower but deeply specialized focus compared to general industrial foundries.

8. Le Sueur Incorporated

Le Sueur Incorporated runs aluminum permanent mold casting, including low-pressure and tilt-pour methods, alongside die, sand, and plastic injection casting under ISO 9001:2015, ITAR, and UL certification, making it one of the more process-diverse foundries on this list.

Comparing These Aluminum Casting Manufacturers

Frequently Asked Questions

What is the difference between sand casting and permanent mold casting for aluminum?

Sand casting uses a disposable sand mold and suits larger parts and lower volumes, while permanent mold casting uses a reusable steel mold that produces finer grain structure and roughly 15% higher mechanical properties, making it better suited to mid-volume production of smaller, more dimensionally consistent parts.

Which aluminum casting manufacturer handles the largest parts?

Eck Industries publicly lists a weight range up to 750-plus pounds, one of the higher ceilings among the specialized permanent mold and sand foundries on this list; sand casting generally scales further than permanent mold for very large or heavy parts.

Do any of these companies also machine and tool the part in-house?

Yes. LeClaire Manufacturing and Le Sueur Incorporated both combine casting with in-house machining and tooling, and Stahl Specialty runs 80-plus CNC machining centers alongside its casting operation.

Why do several of these companies share the same parent group?

Alcast Company, Premier Aluminum, Stahl Specialty, and Watry Industries are all members of the Ligon Permanent Mold Group. That doesn’t make them identical operations, but buyers comparing quotes across all four should know they share common ownership.

What alloys do these foundries typically pour?

Common alloys include 319, 356, and 535, along with 200 through 700 series aluminum. Eck Industries is notable for its A206 high-strength alloy work, which most general-purpose foundries don’t offer.

Conclusion

Aluminum casting suppliers range from large multi-process foundries to narrow aerospace and defense specialists, and the best fit depends on part weight, alloy, and how much of the process (machining, tooling) you want under one vendor. LeClaire Manufacturing’s single-source model across casting, machining, and tooling makes it a strong option for OEM buyers who want to consolidate suppliers without losing quality control.

Have an aluminum part that needs a single-source partner? Request a quote from LeClaire Manufacturing and get straight answers on alloy fit, tolerances, and lead time.