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.
ISO 9001:2015
ITAR Registered
Registration
DFARS-Compliant Material
Compliance program
NADCAP-Certified Vendor Network
ANAB Accredited
Registration
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
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
Firstar Precision CorporationFounded in Brunswick, Ohio, in 2000, Firstar Precision makes precision CNC-machined components and manages projects from product development through delivery. The company began with five employees in a 2,500-square-foot shop and now operates from a 27,000-square-foot facility, taking on complex jobs that other machine shops may pass by. Firstar became 100% employee-owned in 2021 and is an ISO 9001:2015-certified American manufacturer with CMMC Level 2, ITAR registration, and Joint Certification Program approval.BRUNSWICK, OH
K&K Precision, IncFounded in 1991 as a small job shop in Lebanon, Ohio, family-owned and -operated K&K Precision now provides custom precision machining and manufacturing from its Mason facility. The company employs more than 55 Ohioans, supports aerospace and defense work through ISO 9001:2015 certification and ITAR registration, and offers 24-hour manufacturing by request. Its planned expansion will increase the plant from 28,000 to 60,000 square feet by 2027.MASON, OH