One-stop source
Your Trusted Partner for Complete Finishing Solutions
Sub Source, Inc. is a NADCAP-accredited and ISO-certified provider of comprehensive metal finishing, coating, and nondestructive testing (NDT) services. As a true “one-stop” service provider, we manage both critical and secondary processes under one roof—ensuring consistency, quality, and efficiency from start to finish.
Located in a 120,000-square-foot facility in Rockford, Illinois, Sub Source offers a full range of finishing, testing, and support services designed to streamline production and simplify supply chains.
With over 50 years of industry experience, we’re known for solving complex challenges involving specialized parts, unique geometries, and demanding specifications. Our dedicated expediting team maintains a proven on-time delivery rate exceeding 94.7%, helping clients meet tight deadlines without sacrificing quality.
When precision and performance matter, rely on Sub Source, Inc. for expert process control, dependable turnaround, and results that meet the highest industry standards.
Quality Guaranteed
Sub Source holds NADCAP Nondestructive Testing and Aerospace Quality System (AC7004) accreditations as well as ISO 9001:2015 certification.
Industry Sectors
Aerospace
Agriculture
Automotive
Construction
Communication
Defense
Energy
Machine Tool
Power Generation
Recreational
Technology
OUR COMMITMENT
"As the new owner of Sub Source, I look forward to getting to know our customers and learning how we can grow to fit your needs. Our skilled team has been honing their expertise in nondestructive testing and metal finishing since Sub Source was established in 2000. Prior to joining Sub Source, I spent over 40 years in leadership at a local manufacturing facility.
Looking ahead, I plan to identify growth opportunities and make investments to expand the range of services available to you. As always, we remain committed to maintaining the highest quality standards and excellent customer care. Thank you for allowing us the opportunity to partner with you to meet your critical and secondary process needs."
-Stan Valiulis, President
