St. Marys Foundry, Inc. is an established American foundry founded in 1917 and located in St. Marys, Ohio. The company specializes in highly engineered gray iron, ductile iron, Ni-Resist, and specialty metal castings for demanding industrial applications. St. Marys Foundry produces castings ranging from 1,000 to 60,000 pounds using no-bake sand, flask, and pit molding processes supported by advanced melting and process-control technologies. Its comprehensive capabilities include pattern design and repair, solidification modeling, heat treatment, dimensional verification, X-ray inspection, and extensive metallurgical and mechanical testing. The company serves industries including air and gas compression, pumps and valves, machine and tooling equipment, specialty machinery, and other industrial markets. With more than a century of foundry experience, sophisticated equipment, skilled professionals, and a strong commitment to quality, St. Marys Foundry delivers complex, reliable castings engineered to meet demanding customer specifications.