Neodymium Magnet Material - Powerful & Cost Effective

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Sintered neodymium-iron-boron (Nd-Fe-B) magnets are the most powerful commercialized permanent magnets available today. Neodymium Iron Boron is the third generation of permanent magnet developed in the 1980s. It has a combination of very high remanence and coercivity and comes with a wide range of grades, sizes and shapes. With its excellent magnetic characteristics Nd-Fe-B offers  flexibility for new designs or as a replacement for traditional magnet materials such as ceramic, Alnico and Sm-Co for achieving higher efficiency and more compact devices. 

Besten Magnet designs and builds custom neodymium magnets and magnetic assemblies, manufactured to meet your specialty requirements. Send us a request for quote or contact us today for more information about standard or custom neo magnets.

Key Attributes of Neodymium Material Material

-Very high resistance to demagnetization

-High energy for size

-Good in ambient temperature

-Moderately priced

-Material is corrosive and should be coated for long term maximum energy output

-Low working temperature for heat applications, but higher levels of heat resistance materials are being introduced periodically

-Relatively easy to machine, compared to alnico and samarium cobalt magnets.

Key Challenges of Neodymium Magnet Material

-Properties deteriorate rapidly at temperatures in excess of about 150°C depending on grade and permeance coefficient at which the magnet operates at.

-Most grades of NdFeB magnets need to be protected against oxidation by coating or plating the magnets.

Applications of Neodymium Magnets

-Magnetic separators

-Linear actuators

-Microphone assemblies

-Servo motors

-DC motors (automotive starters)

-Computer rigid disc drives, printers and speakers


For as-pressed material, tolerance on the thickness (direction of magnetization) is +/– .005”. Other dimensions are +/– 2.5% or +/– .005”, whichever is greater.

According to International Magnetics Association/Magnet Materials Producers Association (IMA/MMPA) standards, visual imperfections such as hairline cracks, porosity and minor chips are commonly found in sintered magnets. A chipped edge is considered acceptable if no more than 10% of the surface is missing. Cracks are acceptable as long as they do not extend across more than 50% of the pole’s surface.


Since neodymium magnet material is prone to chipping and cracking, it does not lend itself to conventional machining methods. However, neodymium can be abrasively ground, but only with the use of liberal amounts of coolant. The coolant minimizes heat fracturing and the risk of fires caused by oxidized grinding dust.

Magnetizing and Handling

Neodymium magnets are very brittle and very strong magnetically. Therefore, it is crucial to handle these magnets with extreme care to avoid personal injury and damage to the magnets. Fingers can be severely pinched between attracting magnets. Magnets can chip if allowed to “jump at” an attracting object. It is highly recommended that when constructing rare earth magnetic assemblies, they can be magnetized after assembly.