Rare Earth Magnets · Product form
Rare Earth Magnets Sintered Permanent Magnet
Who presses and sinters finished NdFeB or SmCo magnets in the United States?
What it is
A permanent magnet made by aligning fine alloy powder in a magnetic field, pressing it and sintering to full density. The highest energy product route, and the one used for motors, actuators and precision guidance. Almost always ground to final size and coated afterwards, because sintered NdFeB corrodes readily and cannot be cut like a metal part.
- Typical dimensions
- Blocks, arcs, rings and segments, ground to tolerance after sintering.
- Also known as
- NdFeB magnet, neo magnet, SmCo magnet, rare earth magnet, permanent magnet
Suppliers
Grouped by what they actually are. A mill and a distributor answer different needs.
Mills and producers 6
Companies that manufacture this form. Mill direct means longer lead times and mill minimums, with full melt traceability.
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e-VAC Magnetics Inferred
Rare earth permanent magnet manufacture at Sumter, South Carolina, established with Department of Defense support. Magnet type, grades and capacity are NOT established. Recorded so the domestic picture is complete; confirm everything before relying on it.
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Electron Energy Corporation Reported
Samarium-cobalt and NdFeB magnets. High temperature SmCo grades are stated to operate continuously to 550 degrees C. Far beyond NdFeB, which begins losing field irreversibly above roughly 150 degrees C. Described as the only remaining US producer of samarium-cobalt magnets; that claim is significant enough to confirm independently.
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MP Materials Corp. Verified
Finished permanent magnets made at Independence, Fort Worth, Texas from rare earths produced in the company's own upstream chain. Grades, sizes and certifications are not published.
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Noveon Magnetics Reported
Sintered NdFeB magnets, with the company stating compliance with DFARS 252.225-7052. Note the company cites 10 U.S.C. 2533c, the SUPERSEDED number for what is now 10 U.S.C. 4872. Common across this industry's compliance statements. The company's claim to be the only US sintered NdFeB manufacturer is no longer safe to rely on: other domestic lines have since commissioned.
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USA Rare Earth, Inc. Reported
Sintered neodymium-iron-boron permanent magnets from the Stillwater, Oklahoma facility. Whether the upstream alloy and powder are domestic is NOT established, which matters a great deal under a whole-of-chain sourcing rule.
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Vulcan Elements Inferred
NdFeB magnet manufacture in North Carolina, reported at around 10 tonnes a year as of October 2025. That is demonstration and qualification scale rather than a production source. Whether the product is sintered or bonded is NOT established. Recorded here as sintered on the balance of reporting, and it should be confirmed.
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