What 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.
AS9100D:ISO9001
ITAR
Compliance program
ISO 9001:2015
CFM LEAP Certified Supplier
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
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
Olympic Tool & Machine CorpServing aerospace customers since 1960, Olympic Tool & Machine Corp. is a 100-employee machine shop in Aston, Pennsylvania, known for producing fully traceable flight-safety parts and assemblies. Its 65,000-square-foot facility supports customers from prototype work through completed machined parts, with nondestructive testing performed on-site since 1985. The company’s long record includes Boeing supplier recognition and AS9100 certification.ASTON, PA
Minutemen Precision Machine & Tool CorporationFounded in 1969 by an Air Force-trained machinist, Minutemen Precision Machine & Tool Corporation makes close-tolerance machined airframe parts, assemblies, and tooling for military and commercial aerospace. The Castoro family still runs the company, which now employs more than 70 people in a 35,000-square-foot facility with more than 25 CNC milling centers and can produce parts up to 12 feet long. Its aerospace quality system is certified to ISO 9001:2015 and AS9100:2016.POTTSTOWN, PA