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Quality Electromagnetic Coil Winding and Manufacturing

US Cotronics is an ISO 9001:2015-certified coil manufacturer specializing in electromagnetic coil windings and custom electromechanical assembly solutions.

Based in Fairbury, Illinois, we are proud to serve as one of the greater Midwest region’s leading coil winding houses. We also offer precision wire cutting and stripping services, as well as in-house fabrication for lead wire assemblies and related components.

US Cotronics is proud to be a woman-owned small business. Our close-knit enterprise has been family-owned since 1985. Through our uncompromising commitment to quality and customer service, we strive to further solidify women’s place in the American manufacturing space.

Our company strives to offer all of the material resources your supply chain requires, along with the superior craftsmanship and commitment to quality needed to ensure the success and sustainability of your project.

Electromagnetic Coils, Solenoids, and Coil Winding Services

Bobbin Coils

Bobbin Wound Coils

High-quality standard and nonstandard coils featuring a custom bobbin wound construction.

Self Supported

Self-Supported Coils

Premium self-supported coil products ideal for irregular or bobbinless applications where space is a limiting factor.

Choke Coil

Choke Coils

Custom choke inductance coils manufactured to meet your precise DC- and AC- resistance specifications.

Encapsulated Coils

Encapsulated Coils

Reliable encapsulated coil products constructed to protect wiring from moisture, contamination, and corrosion.

Bobbin Coils

Solenoid Coils

Quality-built solenoid coil products manufactured for custom electro-mechanical assemblies and other components.

Tape Wrapped Coils

Tape Wrapped Coils

Insulated tape-wrapped coil products offered in various standard and nonstandard sizes.

Transformer Inductor Voice

Transformer Coils

Custom transformers and inductor coil products engineered for both commercial and industrial applications.

Voice Coil

Voice Coils

Specialized voice coil products manufactured for a wide range of electro-mechanical speaker, microphone, and audio products.

iso logo

ISO 9001:2015-Certified Electromagnetic Coil Manufacturing Services

As an ISO 9001:2015-certified American manufacturer, absolute quality and consistency are paramount at US Cotronics. Our responsive, hands-on quality assurance team utilizes APQP methodology throughout our production processes to build a more robust supply chain. Our meticulous quality control processes ensure that every custom wound coil product is manufactured consistently – on time and according to your exact specifications.

Quality Wound Coils and Electro-Mechanical Assemblies Manufactured in the U.S.A.

Based out of Fairbury, Illinois, US Cotronics is a long-standing American manufacturer of superior electromagnetic coil products since 1985. Our company maintains the highest quality standards and takes great pride in consistently delivering on time. We have consistently shipped over 750,000 products per year at sub 10 ppm quality and greater than 99% on-time delivery.

Made in the USA - White

Serving a Diverse Range of Markets and Industries

Established in 1985, US Cotronics provides ample experience in the manufacturing of custom coil products and electro-mechanical assemblies for a diverse range of industrial market segments and commercial sectors. 
Our industry expertise includes:




Consumer Products

Marine Component

Medical Devices