Established 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.
ISO 9001:2015
certification
CMMC Level 2 compliance
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Center-Line Machining LLCFamily-owned and operated since 2007, Center-Line Machining produces custom precision-machined components from its Mentor, Ohio shop. Its experienced machinists, engineers, and programmers handle projects from prototype through production, with in-house CNC turning and milling supported by detailed inspection and approved outside services. Center-Line is ITAR compliant, ISO 9001:2015 compliant, and AS9100D compliant.MENTOR, OH
Flohr Machine CompanySince 1966, family-owned and operated Flohr Machine Company has made precision-machined parts in Barberton, Ohio, handling both small-count work and high-volume production. Its broad CNC capacity supports demanding aerospace and defense work as well as customers across industrial markets, while ISO 9001 certification underpins its quality and documentation systems.BARBERTON, OH
Standby Screw Machine Products CoFounded in Cleveland in 1939, Standby Screw Machine Products makes custom precision-machined parts for customers ranging from automotive manufacturers to equipment makers. Still privately owned and operated by the Marcell family, the company has grown from two screw machines into a 200,000-square-foot, three-facility operation with 300 employees worldwide. Its Berea, Ohio plant and overseas facilities are ISO 9001:2015 registered, supporting both prototype work and high-volume production.BEREA, OH
Ohio Screw Products, Inc. (OSP)Since 1945, Ohio Screw Products has grown from H. A. Hewitt’s small screw-machine shop into a 100% employee-owned manufacturer in Elyria. Its employee-owner culture shapes a precision machining operation known for handling demanding, high-volume work while preserving traditional machining know-how. ISO 9001:2015 certification and ITAR registration support its long-standing work for customers in aerospace, defense, and other regulated industries.ELYRIA, OH