Founded in 1980, MDF Tool Corporation is a North Royalton toolmaker whose work has grown from a small shop into a 4,000-plus-project history serving aerospace and energy manufacturers. Now under new ownership since 2024, the company draws on more than four decades of experience to design and build investment-casting tooling, with particular expertise in aerospace and land-based turbine engine applications.
Momentous Mold & MachineMomentous Mold & Machine traces its roots to Karl A. Reuther’s 1950 family business in Cuyahoga Falls, where it first became known for rubber molding before moving into demanding aerospace work. Purchased in 2025 by a Northeast Ohio management team, the company now brings that long manufacturing history to custom tooling for aerospace and related high-consequence applications. Its 60,000-square-foot temperature-controlled shop is supported by AS9100D:2016 with Design and ISO 9001:2015 with Design certifications.CUYAHOGA FALLS, OH
Rhinestahl CorporationWhat began in 1967 as a two-car-garage tool shop has become Rhinestahl Corporation, a Mason-based manufacturer of aircraft engine tooling and complex precision assemblies. Its Customer Tooling Solutions division supplies OEM-aligned engine tooling, while its Advanced Manufacturing Group handles demanding machining, fabrication, and capital-equipment assembly for aerospace and other industries. Rhinestahl’s manufacturing operations include a 125,000-square-foot Mason facility, and its AMG division holds AS9100D/ISO 9001 and ITAR certifications.MASON, OH
Princeton ToolKen Bevington started Princeton Tool in 1997 in the basement of his family’s home, and the Mentor, Ohio company has since become known for precision work supporting aerospace and industrial gas turbine programs. Today, Princeton Tool operates more than 135,000 square feet of manufacturing space with over 150 employees across four states, and its quality system is certified to AS9100D and ISO 9001:2015.MENTOR, OH
TDL Tool, IncFounded in Xenia in 1992, TDL Tool designs and builds tooling and specialized machinery while also providing the machining and metalworking services needed to bring those projects into production. The company has grown from a 4,000-square-foot shop built by founder Steve Mangan into a broad manufacturing operation, with notable work ranging from large-format EDM to automation systems and custom prototypes. Since 2017, TDL Tool has been owned by Steve Mangan’s sons, Tim and Dan.XENIA, OH