Founded 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.
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Summit Machining Co LtdSummit Machining Co. is a family-owned and operated precision machine shop in Portage County, Ohio, producing close-tolerance parts for orders ranging from prototypes and single digits to thousands. Established in 1945 and reinvigorated under new ownership in 2019, the company provides CNC and manual machining along with supporting services and customizable stocking programs. Summit is ISO 9001:2015 certified without design, DDTC/ITAR registered, and registered with the United States/Canada Joint Certification Office.MOGADORE, OH
Northwood Industries, IncStarted by Jim Miller in a Northwood, Ohio garage in 1968, Northwood Industries is a family-owned precision machining company that makes component parts and mechanical assemblies for manufacturers. Now led by second-generation owner Kurt Miller, the Perrysburg shop pairs experienced toolmakers with in-house engineering and operates from a 23,500-square-foot facility serving customers across North America, Europe and Asia. Long-standing customer relationships—including one dating to 1970—reflect a shop known for helping engineers refine designs as well as producing the finished parts.PERRYSBURG, OH
Proficient Machining CoEstablished in 1973, family-owned Proficient Machining Co. makes precision CNC-machined and screw-machine parts for customers across industries including aerospace, medical, nuclear, and automotive. The Mentor, Ohio manufacturer combines a long-tenured workforce—with many employees staying 20 to 30 years—with capabilities ranging from one-piece prototypes to high-volume production. Its quality system is ISO 9001:2015 certified.MENTOR, OH
I. Auman Machine CompanyFounded in 1947 by Irwin Auman in his father-in-law’s garage, I. Auman Machine Company has grown into a family-owned manufacturer specializing in precision CNC machining, inspection, and engineering support. The Lebanon, Pennsylvania, company built its early reputation machining alloy-steel castings for M60 tanks and now handles large, close-tolerance parts with equipment including a boring mill for pieces longer than 100 inches. Timothy Auman became the second-generation owner in 1986, and the business is continuing into its third generation under Jordan Auman’s leadership.LEBANON, PA