Top 10 Custom ​Magnetic Assemblies Factory in the USA 2026

Founded in 1951, Dexter is one of the largest and most vertically integrated magnetic assembly houses in North America, with dual AS9100D and ISO 13485 certification that lets it serve both defense primes and implantable medical device makers from the same quality system. The company runs a Class 10,000 (ISO 7) cleanroom for surgical robotics work and follows a formal Stage Gate development process for new programs. In 2024–2025, Dexter's parent (now operating under the Permag group) absorbed both Magnetic Component Engineering (MCE) and Electron Energy Corporation (EEC) — meaning Dexter can now offer in-house samarium cobalt raw material production, precision machining, and finished assembly under one ownership structure.

Arnold has been manufacturing magnetic materials since 1895 and is now a subsidiary of Compass Diversified (NYSE: CODI). Beyond finished magnets, Arnold produces its own precision thin metals (electrical steel, ultra-thin titanium and copper foils) and Flexmag flexible magnet sheet, giving it unusually broad in-house materials capability for high-efficiency motor and generator assemblies. In March 2026, Arnold entered a mutual sales and distribution agreement with USA Rare Earth to strengthen its domestic NdFeB and SmCo supply chain — a relevant signal for buyers concerned about rare-earth sourcing risk.

Integrated Magnetics (part of the employee-owned Integrated Technologies Group) runs production facilities in California and Arizona, plus a wholly owned Nogales, Mexico plant for cost-optimized volume work. Its specialty is complex, multi-level BOM assemblies — Halbach arrays, ultra-high-speed rotors, and magnetron and coupling assemblies — built inside Class 1000 cleanrooms with in-house 4- and 5-axis CNC, EDM, and coil winding. Turnaround on machined custom magnets from stocked raw material can be as short as two weeks.

One of the oldest continuously operating magnet companies in the U.S., Adams pairs a large in-stock inventory (over a million magnets on hand at any time) with build-to-print custom fabrication out of ISO 9001:2015-certified facilities in Elmhurst, IL and Carlsbad, CA, plus additional sales/service offices in KY, NY, and Beijing. Its in-house machine shop handles cutting, surface and OD/ID grinding, with Wire EDM partners for complex geometries. Adams reports a 99% on-time delivery record, which matters for buyers integrating magnets into just-in-time production lines.

Bunting is better known for magnetic separation and metal-detection equipment, but its DuBois, Pennsylvania facility (operating as Magnet Applications, a Bunting division) is the only North American manufacturer of compression-bonded, injection-molded, and hybrid magnets used in custom-designed permanent magnet assemblies. Across its Newton (KS), DuBois (PA), and UK sites, Bunting runs CNC machining, stamping, robotic assembly, and in-house magnetizing equipment under a unified, ISO-certified quality system — giving it real volume-production depth beyond prototyping.

EEC is the only remaining U.S. producer of samarium cobalt magnet material — meaning it doesn't just assemble magnets, it melts, alloys, and presses the raw SmCo itself, all under DFARS-compliant, domestically sourced processes. That vertical control gives EEC unusual insight into material behavior for extreme-temperature and mission-critical programs (its magnets have flown on the JSF, F-18, Patriot, and Predator programs). EEC now operates alongside Dexter and MCE under the Permag group, and recently doubled its SmCo production capacity at the Lancaster facility to strengthen the domestic rare-earth supply chain.

MCE built its reputation on quick-turn, build-to-print magnet fabrication for aerospace, defense, medical, and industrial customers out of its Torrance, California facility. Since its 2022 acquisition (now under the same Permag ownership as Dexter and EEC), MCE has leaned further into fast machining and finishing turnaround — coating, plating, magnetizing, and testing — while gaining access to group-wide SmCo raw material supply. It's a strong fit for engineering teams that already have a drawing in hand and need a magnet built to spec quickly rather than a from-scratch design partner.

Dura Magnetics markets itself explicitly as an "Engineer to Order" manufacturer, and its content backs that up: the company publishes detailed guidance on what a buyer needs to specify (material, tolerances, DFARS status) before requesting a quote, which signals a genuinely consultative sales engineering process rather than a pure order-taking model. In-house capabilities include CMM inspection and Hysteresigraph testing for magnetic strength verification, and Dura stocks DFARS-compliant material domestically to keep small production runs cost-effective.

Tengam occupies a specific and valuable niche: injection-molded ferrite and neodymium magnets, and molded magnetic assemblies that combine a bonded magnet with a plastic or metal insert in a single molding operation. That's the process behind many overmolded sensor magnets, brushless DC rotors, and automotive auxiliary water pump magnets — applications where a machined solid magnet isn't the right answer. Tengam builds custom magnetizing fixtures and test devices in-house and has sold more than five billion magnets since its founding, giving it deep process knowledge specifically in molded (not machined) magnetics.

A family-owned business now in its third generation, Storch began as an industrial sales rep organization before becoming an early designer of insulated multi-pole magnetic assemblies, fixtures, clamps, and tooling. Engineering, precision laser cutting, manufacturing, assembly, and quality control all happen under one Livonia, Michigan roof, which supports fast turnaround for holding-magnet and fixture assemblies specifically. Storch is a better fit for industrial tooling and material-handling-adjacent magnetics than for aerospace-grade rotor assemblies.