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Custom Coils

A reliable source for Electric Coil information and leading Electric Coil Companies & Manufacturers.

Custom coils meet the vast variations of requirements in the market. This market includes industries and applications such as: medical systems, energy storage, power generation, semiconductor equipment processing, solar energy, environmental engineering, security and detection and university research. Read More…

Custom Coils A coil, in the context of electrics, is an electrical conductor such as a wire in the shape of a coil, spiral or helix. These coils are used in applications where electric currents interact with magnetic fields. They are used in devices such as inductors, electromagnets, transformers and sensor coils.
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Leading Manufacturers

Sag Harbor, NY  |  800-724-5952

We are proud of the craftsmanship of our engineers. All of our products are made right here in the United States and we promise that these items are created from high quality resources. Our electrical coils are unique and efficient.

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Sag Harbor Industries, Inc. $$$

Bristol, CT  |  800-825-4319

Established in 1973, Classic Coil Company is a Contract Manufacturer of electronic coils. We manufacture coils for a variety of industries; winding wire gauges from 4-58 AWG. We are ISO 9001-2015 certified, ITAR registered and DFARS Compliant. Our Engineering services allow us to assist with design, reduce cost, and increase efficiency in production. Call or visit our website to learn more about our capabilities.

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Classic Coil Company $$$

Bristol, CT  |  860-584-0927

We are an ISO 9001:2015 certified company which is internationally known for manufacturing high quality electromagnetic-coils. It is our goal to provide quality products, a commitment to speedy delivery, and competitive pricing. We understand that every application is unique, so we encourage you to contact us to discuss your specific requirements. Call us at 1-860-584-0927 and find out what our 50+ years of experience can do for you.

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Quality Coils, Inc. $$$

Alpha, NJ  |  800-867-3526

Since 1962, Torelco has been a supplier of electric coils and transformers of superior quality. We offer custom coils, solenoid coils, ferrite core coils & toroid wound coils to serve a range of industries. Markets served include medical, military, electronics, and industrial. When you work with us, our promise is to build to the exact specifications and meet the custom needs of our customers.

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Torelco $$$

Antigo, WI  |  800-826-9741

Johnson Electric Coil Company is a family owned manufacturer that specializes in custom transformers, coils and inductors. From three phase isolation transformers to single phase inductors and chokes, we carefully design our products to meet your exact specifications.

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Johnson Electric Coil Company $$$
placeholder image Sag Harbor Industries, Inc. Classic Coil Company Quality Coils, Inc. Torelco Johnson Electric Coil Company

What types of electric coils may a customer choose from to create custom coils? Coils can be classified both by the frequency of the current they are designed to work with and by their function. Coils may be direct current (DC), meaning they operate with a steady, or direct, current in their windings. Or, they may be audio frequency (AF), operating with alternating currents in the audio frequency range, which is less than 20 kHz.

Finally, coils may be of the radio frequency (RF) type, which operates with alternating currents in the radio frequency range, which is above 20 kHz. The main types of coils, classified by their function, are: electromagnets, inductors, transformers and transducer coils. Electromagnets are coils that generate a magnetic field for an external purpose, often in order to exert a mechanical force onto something. Inductors, also called reactors, are coils that generate a magnetic field that interacts with the coil itself, in order to induce a back EMF.

Transfer Molded and Injection Molded Coils Transfer Molded and Injection Molded Coils - Sag Harbor Industries, Inc.

This EMF opposes changes through the coil, which makes the coil temporarily store energy or resist changes in currents. Coils that fall under the transformer blanket are devices that have two or more magnetically coupled windings, or sections of a single winding. In order to work, the primary winding, which is a time varying current in one coil, generates a magnetic field, which in turn induces a voltage in the other coil, called the secondary winding.

Finally, transducer coils are used to translate time-varying magnetic fields into electric signals, and vise versa. An example of this is a loop, or radio, antenna, which converts radio waves to electric currents.

Aside from type, when designing custom coils, a customer may select its form material, wire material, wire coiling process, wire type and coil shape, among others. Custom coil wire material options include copper and aluminum, and the processes by which this wire may be formed include: single layer, multi-layer, dry/epoxy wound, random layer, precision winding, self-bonding, manual and automated.

The wire type possibilities of custom coils are: insulated magnet, bare magnet, hollow core, solid core and tube. Coil shapes include: round, square, rectangular, oval, three-dimensional and other custom shapes. Aside from these, custom coils may be differentiated by their testing capabilities, applications, coil form materials, terminations, diameter and insulators.

Custom Coils Informational Video