TH Manufacturing grew out of a small Holmes County foundry founded in 1975 and reopened by two foundry engineers in 1992. Now rooted in Ohio’s Amish country, the company is known for its experienced Amish core makers and for solving unusual foundry problems through molded sand cores and custom-built equipment. It has completed more than 9,000 unique projects for foundries across the United States and beyond.
J-Lenco, IncBuilt from a dirt-floor garage in Marion, Ohio, J-Lenco has produced sand cores for ferrous and non-ferrous foundries since 1968. The family-owned and operated company now makes cold-box cores for prototype through high-volume work, including a former run of roughly 20,000 rotor cores per day for Kelsey-Hayes. J-Lenco also produces ASTM-standard test cores and maintains traceable quality controls on each mix.LARUE, OH
HumtownHumtown is a family-owned, three-generation manufacturer whose roots go back to 1959, when Russell Lamoncha opened a pattern shop in Columbiana, Ohio. Today, the company supplies foundries with conventional and 3D-printed sand cores and molds; its additive division began in 2014 and moved to a larger Boardman, Ohio facility in 2024. Humtown also makes the UNItube blow-tube system for core-making operations.COLUMBIANA, OH
Founders Sand CoresWith more than 30 years of core-making experience, Founders Sand Cores produces sand cores for foundries, from established production work to complex new designs. The Deerfield, Ohio shop is notable for pairing traditional cold- and hot-box work with 3D-printed sand cores, a capability it began developing in 2024. Founders also researches 3D-printed foundry tooling and sand reclamation as it helps customers move prototypes and difficult castings toward production.DEERFIELD, OH
Chris Erhart Foundry and Machine CoEstablished in 1854 in Lawrenceburg, Indiana, Chris Erhart Foundry and Machine Co. is a family-owned metalcaster that moved to Cincinnati in 1874 and is among the oldest ongoing family-owned metalcasters in the United States. It makes low- and medium-volume gray and ductile iron castings, specializing in jobbing and semi-production work for short runs, repair parts, and prototypes.CINCINNATI, OH