Thermal Process Holdings: Full-Range of Chicago Area Heat Treating Services

Meet your specs. Minimize defects. Deliver on time.

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Comprehensive Heat Treating Capabilities with Four Facilities Serving the Chicago/Milwaukee Region

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At Thermal Process Holdings, we’re your one-stop partner for critical heat treating processes. Whether you need to improve strength, wear resistance, fatigue life, or dimensional stability, we’ve got the capability & expertise to deliver to spec on time.

  • Continuous & Batch Integral Furnaces
  • Gas Nitriding & Fluidized Bed Processing
  • Aluminum Solution and Aging
  • Vacuum and Vacuum Tempering
  • Induction Hardening Annealing
  • Atmosphere Hardening and Normalizing
  • and more!
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Services That Make a Difference

  • Precision & Process Control: We maintain tight tolerances and strict adherence to specs so your parts come out correct, every time.

  • Full Range Under One Roof: You won’t need to send parts to multiple vendors. Everything from softening to high-performance hardening is done in-house.

  • Clean & Consistent Surfaces: With vacuum/bright tempering and well-controlled atmospheres, oxidation and scale are minimized.

  • Flexible Jobs, Fast Turnaround: Small run or big batch, rush jobs or scheduled orders—we work with your timeline.

  • Materials Wide Support: Steel, cast iron, alloy steel—whatever your substrate, we’ve treated it, tested it, and met spec.

  • Certifications:
    • ISO 9001
    • AS9100
    • CQI-9
Learn More About Our Process

Trusted by Midwest Manufacturers & Engineers For Over 50 Years

Locations

With our four plants, we offer our customers decades of experience and a focus on quality, capacity, and service. With top tier facilities including Rockford Heat Treating, Diamond Heat Treat and Hudapack, you can count on TPH to keep your production schedule running smoothly. From small machine shops to global OEMs, engineers trust us because we deliver three things consistently:

  • Proven Experience – Since 1967, we’ve heat treated millions of parts across industries like automotive, aerospace, agriculture, and heavy equipment.

  • Uncompromising Quality – Every job follows strict process controls and is verified against customer specs to ensure parts perform in the field.

  • On-Time Delivery – We understand downtime is costly. Our facility and processes are built for dependable turnaround without compromising results.

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Frequently asked questions

What types of heat treating do you offer?

We provide a full range of services, including atmosphere/neutral hardening, carburizing, carbonitriding, annealing, vacuum tempering, stress relieving, normalizing, cryogenic treatment, and surface hardening (flame and induction).

How fast can I get my parts back?

Turnaround depends on job size and process, but most orders are completed within a few business days. Rush services are available. Call us to discuss urgent needs.

Do you handle both small and large production runs?

Yes. Whether you need a single prototype treated or thousands of parts, our 50,000+ sq. ft. facility and high-capacity furnaces are designed to handle jobs of all sizes.

Do you offer metallurgical support or testing?

Our lab supports all of our in house inspection and customer needs. Our services are also supported by an accredited lab.

Do you offer pick up and delivery services?

Rockford Heat Treaters offers daily pick up and delivery of your parts. Call us today for more information.