Darby Metal Treating, Inc is a Women Owned company founded in 2012 by the Darby family. The Darby's own a successful manufacturing company in Plainwell Michigan called TMD Machining; focused on precision machined Medical Aerospace products. 

Why Start a Heat Treat? 

Tom saw a need for a state of the art heat treat facility in his area and decided to build one based upon the following principles:

  • Putting customer needs FIRST

  • Quality

  • On time delivery


Darby Metal Treating is located in Plainwell Michigan and occupies a 40,000 square foot building on 3.5 acres. In 2020 an additional 15,000 square feet will be added on to provide more room to add additional equipment to better assist our customers. 

DMT's Commitment 

Darby Metal Treating's goal is to exceed the customers expectations with the quality and overall value of service provided!

Customer Satisfaction 

No matter the size of your company Darby Metal Treating will always treat you like family and give you the best service possible!