Precision Boring Co is a world-class custom component machining and manufacturing company operating out of 50,000 sq/ft climate-controlled facilities in Clinton Township, Michigan. Started in 1937, we're a third generation family business that has a diverse national customer base of Fortune 500 companies and suppliers across all sectors of the global economy including heavy industry, aerospace, defense, automotive, nuclear, and machine tool. Many of our customers have longstanding relationships with us spanning decades because of our ability to achieve cost efficiency, quality, and dependability. We do more than just promise: we deliver high quality results, on time.

We specialize in machining and manufacturing complex parts through large CNC machining, large part OD and ID grinding, precision component machining, fabrication, turning, milling, welding, boring mill services, and more. Our innovative engineering team works with our highly skilled machinists to solve the most complex problems, meeting our customer's requirements and exceeding their expectations.

Our company was born out of the Great Depression. The same core values that brought America through its biggest economic downturn still drive our business today: honesty, integrity, and reliability. Throughout our proud 80 year history, we've used advanced technology to serve our customers with excellence. In fact, our industrial knowledge combined with our wide range of advanced equipment sets us apart in our industry. We're able to cut not just costs, but also the long lead times that are traditionally associated with subcontract component machining.

When you work with Precision Boring, you can expect open communication, superior technical support, and professional workmanship. You can expect your job to be done right, on time, as promised. We're committed to delivering value and quality to every job and we're ready to be your expert partner.

Our Services

Press Part castings on racks

Press Parts

OEM alternative for all major brands

Custom component machined part


Milling, turning, fabrication, & measuring

ID completed precision grinding part


Large OD/ID grinding, large face capacity grinding, tapers, faces

Fermet large 5-axis CNC machine

CNC Machining

Large 5-axis CNC floor mill, boring mills with CNC rotary table


Global Tooling Systems logo
Everson Tesla Inc logo
Fermilab logo
Georg Fischer corporate logo

Five Reasons to Work with Us

We’re never satisfied when it comes to delivering a quality product. That’s why we’ve implemented a robust QA system certified to ISO9001:2008 requirements. All of our work is done in our climate controlled facility with state of the art equipment, including accuracy verified by independent laser inspection.
A good reputation isn’t earned overnight. Precision Boring Company has served customers for almost 80 years, while sister company Manor Industries has been in business for nearly 60 years. Both Precision and Manor have provided customers across the United States and around the world with products that meet needs and exceed expectations.
We’ve assembled the best team of engineering, machining, and technical personnel in Detroit. By handling all of our work in-house, we’re able to provide comprehensive solutions for your most complex needs, including secondary processes after machining. These services make us your one stop shop.
Subcontract component machining is notorious for long lead times. Our innovative approach offers you a low risk solution that shortens those lead times. That means that you get the part you need, on-time, as promised. Throughout the entire project, you’ll have unlimited access to our engineering and technical support team through our open communication policy.
Made in Detroit
Detroit has long been the heart of American industrial innovation. Since 1956, our sister company Manor Industries has pioneered reverse engineering of press parts making us an industry leader. Now in our third generation of family ownership, since 1937 Precision Boring Company has brought innovation and ingenuity to the precision component industry while creating jobs and opportunity right here in our community.