Your one-stop source for quality critical and secondary processes



Total solutions provider for critical and secondary processes

Sub Source, Inc. is a NADCAP accredited and ISO certified "one-stop" service provider for critical and secondary processes.  

We specialize in nondestructive testing, coatings and metal finishing.  Additional services are available to ensure your entire project is completed within our 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.   

Industry Sectors

  • Aerospace

  • Agriculture

  • Automotive

  • Communication

  • Construction

  • Defense

  • Energy

  • Machine Tool

  • Power Generation

  • Recreational

  • Technology


Rely on our NADCAP-accredited nondestructive testing to analyze your materials for cracks, weld verification, voids and other defects.

View Nondestructive Testing


With multiple lines and batch capabilities, Sub Source will meet your unique size, shape and OEM specifications. 

View Coatings

Metal finishing

We offer a wide range of chemical processes for several types of steel and aluminum. 

View Metal Finishing

Our Customers Trust Us

Jeff Swanson
Advanced Machine & Engineering Co.

Sub Source is a key component to our success. They continually thrive in the areas of quality, cost, on-time delivery and have an excellent customer service team that meet the ongoing demands of our business. They are a great supplier and will be for years to come. 

Kevin Kretsinger
Rockford Spring Company

Sub Source always comes through for our finishing needs. They go above and beyond to meet our requirements.

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.