If you are sourcing neodymium-iron-boron (NdFeB) magnets for a U.S. program, the honest starting point is this: most of the world's sintered NdFeB is still made overseas, domestic capacity is growing but small, and the right supplier depends heavily on your end-use and volume. This guide separates the companies that actually sinter NdFeB on U.S. soil from the established U.S. houses that machine and assemble it, from the international factory-direct suppliers that carry most commercial volume, so a buyer can match the source to the requirement instead of the marketing.
01 · What to look for
What buyers actually need from an NdFeB supplier
For a procurement engineer, the hard part isn't finding a company that will sell you magnets. It's finding one you can actually qualify: one that holds spec at temperature, ships certified to your industry, prices honestly, and keeps shipping when tariffs and export rules move. A supplier worth shortlisting covers:
End-use restrictions (defense/aerospace). For covered U.S. procurement, DFARS 225.7018-2 already restricts covered-country melting and magnet production through 31 December 2026. From 1 January 2027 the NdFeB restriction extends from mining through finished-magnet production, subject to the applicable exceptions. China is a covered country. Check the contract and traceability with the purchasing authority; a commercial purchase and a covered DFARS contract have different requirements.
Certifications matched to your industry. Confirm the quality-system and submission requirements specified by your customer. Verify the current certificate, covered activities and named production plant with the issuer. The contracting supplier and certified production entity can differ; document their responsibilities and the production route.
Magnet cost and GBD. Grain boundary diffusion is evaluated against the required coercivity, material composition and magnet geometry. In a reported N45H specimen comparison, Hcj changed from 17.67 to 26.55 kOe and Br from 13.62 to 13.61 kGs. A new programme needs its own material validation and cost comparison; this specimen result does not establish a saving for another part.
Volume, MOQ, and lead time. Domestic producers are ramping and may favor large strategic offtakes; distributors serve small quantities at a premium; factory-direct international suppliers typically carry commercial volume with competitive lead times.
Assembly vs. bare magnets. A supplier that ships a finished, magnetized, balanced assembly to your drawing removes magnet handling, magnetizing, and balancing from your line, often worth more than the per-kilogram price on the magnet alone.
Supply continuity and second-sourcing. A qualified second source can reduce dependence on one production route. Compare capacity, qualification work, material origin and delivery constraints for each route. Export approval and transit timing remain specific to the shipment.
The best magnet supplier isn't the one with the longest grade list. It's the one that can prove the grade holds at your operating temperature, certify it to your industry, and keep the line fed when the supply chain moves.
02 · The List
U.S. Magnet Manufacturers & Suppliers
Mainrich International
Est. 1994 · International, serving U.S. buyers (manufacturing partners in China)
Custom sintered NdFeB magnets and magnetic assemblies, reviewed against the drawing. Mainrich range N30 to N56, no AH grades; material, geometry and operating conditions confirmed together.
Best for: Commercial-volume NdFeB and assemblies, GBD cost reduction, second-source continuity
Certifications: Current production-plant certificate and order scope confirmed during qualification.
2.MP Materials
Est. 2017 · Las Vegas, NV (mine: Mountain Pass, CA; magnets: Fort Worth, TX)
Integrated mine-to-magnet: rare-earth mining and refining plus sintered NdFeB at its Fort Worth 'Independence' plant (first commercial magnets late 2025, ramping to automotive offtake).
3.Noveon Magnetics
Est. 2014 · San Marcos, TX
Sintered and bonded NdFeB produced domestically via a recycling-based process; an operational U.S. sintered-NdFeB producer.
4.USA Rare Earth
Est. 2019 · Stillwater, OK (deposit: Round Top, TX)
Sintered NdFeB magnet line in Oklahoma (first commercial production commissioned 2026), paired with a domestic heavy-rare-earth resource.
Shortlisting suppliers for a U.S. program?
Send a drawing or a target spec and we'll quote the right grade or assembly, flagging any end-use restriction up front.
5.e-VAC Magnetics (Vacuumschmelze)
Sumter, SC (parent: Hanau, Germany)
New U.S. sintered-NdFeB plant (first U.S. magnets shipped late 2025); parent VAC is a century-old European rare-earth magnet maker.
6.Arnold Magnetic Technologies
Est. 1895 · Rochester, NY
Samarium-cobalt (RECOMA), alnico, bonded and flexible magnets, precision thin metals, and engineered NdFeB assemblies (machined and assembled, not domestically sintered).
7.Electron Energy Corporation
Est. 1970 · Landisville, PA
Vertically integrated samarium-cobalt magnets and assemblies, the only remaining U.S. sintered-SmCo producer; also NdFeB products and assemblies.
8.Thomas & Skinner
Est. 1901 · Indianapolis, IN
Cast and sintered alnico magnets, magnetic assemblies, and transformer laminations, manufactured in the U.S.
9.Bunting Magnetics
Est. 1959 · Newton, KS
Magnetic separation and metal-detection equipment, custom and bonded magnets, and magnetic assemblies.
Reviewing a second source?
Mainrich reviews the drawing, production route and shipment documentation for the proposed order. Qualification and delivery timing are agreed with your team.
10.Dexter Magnetic Technologies
Est. 1951 · Elk Grove Village, IL
Engineered magnetic assemblies and circuits, sourcing, machining, magnetizing, and assembly (includes its MCE division for aerospace/defense).
11.Integrated Magnetics
Culver City, CA
Custom magnets and magnetic assemblies (Halbach arrays, rotors) across NdFeB, SmCo, alnico, and ferrite.
12.Stanford Magnets
Lake Forest, CA
U.S.-based supplier/distributor of NdFeB, SmCo, alnico and ceramic magnets sourced internationally.
13.Adams Magnetic Products
Est. 1950 · Elmhurst, IL
Custom fabricator and distributor of neodymium, SmCo, alnico, ceramic and flexible magnets and assemblies.
14.Master Magnetics (The Magnet Source)
Est. 1976 · Castle Rock, CO
Manufacturer and distributor of commercial, consumer and industrial magnets held in large domestic stock.
15.K&J Magnetics
Est. 2003 · Pipersville, PA
Online catalog distributor of stock NdFeB magnets with strong technical data tooling.
Suppliers are labelled by type so buyers can match a source to their end-use. Mainrich is listed first as our own recommendation for commercial-volume sourcing, and is labelled honestly as an international factory-direct supplier, not a domestic U.S. producer. Company facts (location, founding year, certifications) reflect public information and may change, so verify current certifications directly with each supplier during qualification.
03 · Market
The State of U.S. NdFeB Supply
The U.S. Commerce Department’s 2022 review reported that China supplied 75% of U.S. sintered-NdFeB imports by value in 2021. Separately, the IEA reports China’s share of global sintered permanent-magnet production at 94% in 2024. These are dated measures with different denominators, not current supplier-capacity figures.
U.S. producers use different feedstock and production routes. MP Materials reports that NdFeB manufacturing began at its Texas Independence facility in December 2025. Noveon Magnetics produces sintered NdFeB in Texas using recycling-based feedstock. eVAC announced its first South Carolina NdFeB shipment on 12 December 2025.
Established U.S. magnet companies also machine, magnetize and assemble imported sintered blanks. Confirm which operations take place at the proposed site and the current qualification and volume available for your programme.
04 · Our Position
Where Mainrich Fits
International factory-direct
Mainrich is an international supplier serving commercial magnet programmes through a production network we hold equity stakes in. Our sintered NdFeB range is N30 to N56, with no AH grades; grade, geometry and material route require drawing review. We coordinate loose magnets and assemblies, with inspection, production-plant certification scope, documentation and delivery confirmed for the order.
Production origin is stated for the proposed part. Our supply scope is commercial industrial applications, subject to end-use review.
FAQ · Questions
Frequently Asked Questions
Are there neodymium (NdFeB) magnet manufacturers in the USA?
Yes, but domestic sintered-NdFeB capacity is still ramping in 2026. Noveon Magnetics (Texas) is an operational U.S. sintered-NdFeB producer, MP Materials reports starting Texas NdFeB manufacturing in December 2025, and eVAC reported its first South Carolina shipment on 12 December 2025. Check each producer's current qualification and volume availability. Established U.S. companies such as Arnold, Electron Energy, Thomas & Skinner, Bunting, Dexter, and Integrated Magnetics manufacture magnets and assemblies domestically, often strongest in samarium-cobalt, bonded, and alnico magnets, and many import sintered NdFeB blocks that they machine, magnetize, and assemble in the U.S.
Can U.S. defense programs use Chinese-made neodymium magnets?
For covered U.S. procurement, DFARS 225.7018-2 already restricts covered-country melting and magnet production through 31 December 2026. From 1 January 2027 the NdFeB restriction extends from mining through finished-magnet production, subject to the applicable exceptions. China is a covered country. Check the contract and traceability with the purchasing authority; a commercial purchase and a covered DFARS contract have different requirements.
Is it cheaper to buy magnets from a U.S. manufacturer or to import them?
Compare quotations for the same drawing, grade, quantity and inspection requirements. Include tooling, qualification, freight, duties and delivery terms. A supplier’s country or a lower raw-material input does not establish the lower finished-part cost.
What certifications should a magnet supplier have?
Confirm the quality-system and submission requirements specified by your customer. Verify the current certificate, covered activities and named production plant with the issuer. The contracting supplier and certified production entity can differ; document their responsibilities and the production route.
How can GBD affect magnet cost?
Grain boundary diffusion is evaluated against the required coercivity, material composition and magnet geometry. In a reported N45H specimen comparison, Hcj changed from 17.67 to 26.55 kOe and Br from 13.62 to 13.61 kGs. A new programme needs its own material validation and cost comparison; this specimen result does not establish a saving for another part.
Should I single-source or second-source my magnet supply?
A qualified second source can reduce dependence on one production route. Compare capacity, qualification work, material origin and delivery constraints for each route. Export approval and transit timing remain specific to the shipment.
Sourcing NdFeB for a U.S. program?
Send a drawing or a target specification. Our engineering team will quote the correct grade or assembly with real design margin, and flag any end-use restrictions up front. Human response within 1 business day; pricing within 2.