About Us

Sub Source is your "one-stop" source for quality critical and secondary processes.

One-stop source

Sub Source, Inc. is a NADCAP accredited and ISO certified "one-stop" service provider for critical and secondary processes.  We specialize in non-destructive testing, coatings and metal finishing.  Additional services are available to ensure your entire project is completed within our 120,000 square-foot Rockford, IL facility.

With over 50 years of industry and technology expertise, we excel at solving challenges with difficult parts or processes. Our dedicated expediting team reduces lead times and holds an on-time delivery performance that is greater than 94.7%. Rely on our expertise and efficiency to carry even your most challenging project to completion.   

Quality Guaranteed

Sub Source holds NADCAP Nondestructive Testing and Aerospace Quality System (AC7004) accreditations as well as ISO 9001:2015 certification.

Founded in 2000, Sub Source has established itself as a quality leader that delivers single-source solutions for demanding critical and secondary processes.  


Industry Sectors

  • Aerospace

  • Agriculture

  • Automotive

  • Construction

  • Communication

  • Defense

  • Energy

  • Machine Tool

  • Power Generation

  • Recreational

  • Technology


"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

one-stop source

Let our dedicated team of experts coordinate all of your critical and secondary process needs. With our NADCAP accreditation and ISO certification, you can trust us to complete your project with the highest quality standards.