Founded in 1973, family-owned Great Lakes Power Companies manufactures and remanufactures power-transmission and drivetrain components while supplying parts, engineering support, and repair services for heavy-duty marine and off-highway equipment. Headquartered in Madison, Ohio, the company combines specialized operating entities and a nationwide branch network to support customers worldwide, including with custom CNC manufacturing and OEM-specification rebuilds. Its custom manufacturing operation handles projects from individual components to production runs exceeding 10,000 pieces and maintains quality procedures compliant with QS9000 standards.
QS9000 standards
Compliance program
Marich Machine & Tool CompanyOpened in Cleveland in 1982, Marich Machine & Tool Company manufactures custom machined components for demanding equipment and industrial applications, including tunnel boring and nuclear work. Its Mazak-based CNC turning and milling operation handles parts up to 22 inches in diameter and 80 inches between centers, supported by in-house quality assurance and product traceability.CLEVELAND, OH
Hahn Manufacturing CompanyFounded in Cleveland in 1916 by journeyman machinist Emil P. Hahn, Hahn Manufacturing Company remains a multigenerational domestic manufacturer of large, precision-machined OEM components. Today, Hahn’s third generation is still hands-on, combining large-part capacity with custom service for production and prototype work. The company is ISO 9001:2015 certified and ITAR registered, with lifting capacity up to 50,000 pounds and machining capability for parts up to 200 inches.CLEVELAND, OH
Potesta & Company, LLCFounded in 2012 by Richard Potesta, Potesta & Company manufactures custom slewing rings, slewing drives and gears for equipment designers, manufacturers and rebuilders. Through its SlewPro and Rhino Gear operations, the Hudson, Ohio company combines U.S.-based engineering with custom manufacturing and application support, serving OEMs from small shops to large manufacturers across North America. Its manufacturing facility is ISO 9001:2015 certified, and the company can comply with API and ABS requirements.HUDSON, OH
Port Clinton Manufacturing CoFounded in 1929, Port Clinton Manufacturing Co. is a locally owned family business that produces close-tolerance precision-machined parts and assemblies from its 68,000-square-foot Ohio plant. Its long-standing strength is high-value hardened, ground, and precision components, with in-house machining and broaching supporting demanding applications such as diesel engines and mechanical power transmission. The company serves several Fortune 500 customers that have remained with it for more than 50 years.PORT CLINTON, OH