Custom Transformers and Custom Magnetic Products

Since 1949, Transformer Manufacturers, Inc.’s (TMI) expertise in manufacturing quality custom designed transformers and magnetic products has enabled us to solve problems for our customers while meeting or exceeding their specifications and requirements.
We manufacture custom-designed transformers for a wide range of industries including:

Coil types include bobbin, layer, or stick wound, precision wound and toroidal.

Transformer manufacturing is our core business, and all products are proudly made in America. Transformer Manufacturers serves the global market from our facilities centrally located in the Chicago transportation hub.
Rely upon Transformer Manufacturers as your magnetics manufacturing partner for:

Transformer Types

Transformer Types photo

Let’s Get Started

Send TMI a request for quote with your project requirements, and attach a print/drawing. We’ll respond quickly and start a dialog that will lead to the optimal solution to address your needs.


The TMI manufacturing quality management system conforms to ISO 9001:2008. Transformer Manufacturers' plant offers value-centered manufacturing that is totally dedicated to high quality and continuous improvement. Our products are made in the USA and incorporate the finest in materials and workmanship.