Neodymium magnets are high-precision magnets, depending on the space in which we are going to use them and the sector in which we are going to apply them, we can find different sizes and grades. Neodymium magnets are created under a casting process, which is why we can find them in various forms.

Since the neodymium magnet is manufactured by sintering, this allows us a great variety of designs and shapes, for example: round, rectangular, square, and long...


Type of material

Rare earth


Neodymium (Nd)
Iron (Fe)
Boron (B)

Work temperature

From 80ºC to 200ºC


Powerful magnets
High coercivity and remanence
Application in confined spaces

Neodymium magnets or powerful magnets are permanent magnets with the highest strength and high coercivity. It is the strongest magnet on the market and the most widely used in the industrial sector.

The production of neodymium magnets has a low resistance to corrosion so it has a protection or coating to ensure the maintenance and durability of the magnet over time, this coating will prevent it from losing its properties and being affected by corrosion and external chemical agents.

The coating of the neodymium magnet can be epoxy, nickel, zinc, copper, and others. Below, we can see a table of neodymium magnet qualities in which we find the remanence, the coercive force, the working temperature, and the minimum and maximum resistance of each type of neodymium quality.

Most neodymium magnets, due to their high remanence and coercivity, mentioned above, can be used in the electronics sector.

Neodymium magnets or strong magnets have a high density and a degree of magnetisation of 5,000 gauss and 52 MGOe. The higher the grade, the more magnetisation the magnet will have, as it is made of neodymium magnets, the letter in the grade is an N. Neodymium magnets have a degree of magnetisation that can vary from N27 to N52. Neodymium magnets have a higher price than ferrite magnets because of the complexity of obtaining their raw material.

All neodymium magnets are anisotropic and therefore only can magnetise in one direction. The magnetisation of square neodymium magnets is diametrically magnetised.


GradoNomenclaturaRemanenciaFuerza CoercitividadCoercitividad IntrínsicaEnergía Máxima ProductoTemperatura de Trabajo
ImamagnetsGrade Nomenclature Remanence Coercive force Intrinsic coercive Maxium energy product Working temp
Neodimyum Magnets Grade Nomenclature Br bHc Fuerza Ihc (BH) maxTemperatura de Working temp
Neodimyum Magnets Grade Nomenclature Br max (T) Br min (T) HcB min (kA/m) HcB max (kA/m) HcJ min (kA/m) HcJ max (kA/m) BHmax min (kJ/m³) BHmax max (kJ/m³) Max. Temp. trabajo: (ºC)
NdFeB N35AH anistropicN35AHNdFeB  263/2631,171,198769152626-263279220
NdFeB N34AH anistropicN34AHNdFeB  247/2551,101,168369002547-247271220
NdFeB N33AH anistropicN33AHNdFeB  247/2631,131,158448762626-247263220
NdFeB N30AH anistropicN30AHNdFeB  223/2631,081,128048442626-223239220
NdFeB N33EH anistropicN33EHNdFeB  247/2391,131,158448762388-247263200
NdFeB N30EH anistropicN30EHNdFeB  223/2391,081,128048442388-223239200
NdFeB N28EH anistropicN28EHNdFeB  207/2391,041,087808112388-207223200
NdFeB N38UH anistropicN38UHNdFeB  287/1991,221,259089391990-287303180
NdFeB N35UH anistropicN35UHNdFeB  263/1991,171,198769001990-263279180
NdFeB N33UH anistropicN33UHNdFeB  247/1991,131,158448761990-247263180
NdFeB N42SH anistropicN42SHNdFeB  318/1601,281,309559871595-318334150
NdFeB N40SH anistropicN40SHNdFeB  303/1601,251,279399631595-303318150
NdFeB N38SH anistropicN38SHNdFeB  287/1601,221,259089391595-287303150
NdFeB N35SH anistropicN35SHNdFeB  263/1601,171,208769001595-263279150
NdFeB N33SH anistropicN33SHNdFeB  247/1601,141,178448761595-247263150
NdFeB N42H anistropicN42HNdFeB  318/1351,281,309559871353-318334120
NdFeB N40H anistropicN40HNdFeB  303/1351,261,289249551353-303318120
NdFeB N38H anistropicN38HNdFeB  287/1351,221,269009391353-287303120
NdFeB N35H anistropicN35HNdFeB  263/1351,171,208689001353-263279120
NdFeB N33H anistropicN33HNdFeB  247/1351,141,178368761353-247263120
NdFeB N30H anistropicN30HNdFeB  223/1351,081,127948361353-223239120
NdFeB N45M anistropicN45MNdFeB  342/1111,331,3597110031114-342358100
NdFeB N42M anistropicN42MNdFeB  318/1111,291,329559871114-318334100
NdFeB N40M anistropicN40MNdFeB  303/1111,261,299249551114-303318100
NdFeB N38M anistropicN38MNdFeB  287/1111,221,269009391114-287303100
NdFeB N35M anistropicN35MNdFeB  263/1111,171,208689001114-263279100
NdFeB N52 anistropicN52NdFeB  398/881,421,45794860875-39841480
NdFeB N50 anistropicN50NdFeB  383/881,401,43794860875-38339880
NdFeB N48 anistropicN48NdFeB  367/881,381,40810860875-36738380
NdFeB N45 anistropicN45NdFeB  342/961,331,36924955955-34235880
NdFeB N42 anistropicN42NdFeB  318/961,291,31915939955-31833480
NdFeB N40 anistropicN40NdFeB  303/961,261,29908924955-30331880
NdFeB N38 anistropicN38NdFeB  287/961,221,26900915955-28730380
NdFeB N35 anistropicN35NdFeB  263/961,171,20860900955-26327980
NdFeB N33 anistropicN33NdFeB  247/961,141,17820876955-24726380


Neodymium magnets or powerful magnets are the most commonly used magnets due to their great advantages. The greatest advantage that we can find in neodymium magnets is the great magnetisation force that they possess about their size.

Neodymium magnets are the magnetic elements with the highest remanence and high coercivity. Thanks to its magnetic properties, the neodymium magnet is the most powerful magnet on the market and is the most widely used in the industrial sector.

Neodymium magnets of the same size as other magnets, such as ferrite magnets, are stronger, and in some cases, being smaller in size, they can even withstand more force.

Work temperature

Neodymium magnets can be treated at a maximum temperature of 80ºC. If at any time they are subjected to a temperature higher than 220ºC, the neodymium magnet will begin to lose its properties as the temperature increases.

The working temperature of the neodymium magnet is one of the factors to be taken into account in the application of the magnet.

At IMA we currently have a wide range of powerful magnets that cover temperatures from 80ºC to 220ºC in Neodymium, from 220ºC to 350ºC, we have the alternative of Samarium magnets.


NíquelNi+NI10-20 µmSilver (bright)Excellent resistance to the humid atmosphere200°C
Níquel Ni+Cu+NI10-20 µm Resistance superior to the humid atmosphere200ºC 
ZincZn azul8-20 µmBlue-silverGood resistance to salinity 160ºC 
ZincColor Zn 8-20 µmBlue-silverExcellent resistance to salinity 160ºC 
EstañoNi+Cu+Sn15-20 µmSilver brightResistance superior to the humid atmosphere 160°C
CobreNi+Cu10-20 µmgoldTemporary treatment  
EpoxiNi+Cu+epoxy15-25 µmblackExcellent resistance to weather and salinity 120°C

Additional protection for the neodymium magnet will ensure long-term maintenance and durability, preventing it from losing its properties and possible corrosion by external chemical or atmospheric agents.

As mentioned above, neodymium magnets are fragile due to their low corrosion resistance, so we need a coating to protect them. In addition to the protective function, it also acts as an increase in the corrosion resistance of neodymium magnets to treat them in places with a high degree of humidity. In this way, the magnet can withstand lower temperatures and prevent oxidation.

Neodymium magnets can be coated with epoxy, nickel, zinc, copper, and others. However, nickel coatings are mostly used for neodymium magnets. The nickel coating for neodymium magnets has a high performance and a high corrosion resistance.


Due to their strong magnetic properties, neodymium magnets can be used for a large number of applications, thanks to their high magnetising force.

In our daily lives, we can find neodymium magnets in door locks, making the function of allowing the opening and closing of fire doors. Also, one of the major applications that is currently booming is electric cars, more specifically in motors and generators, neodymium magnets are responsible for transforming electrical energy into mechanical energy.

Electric Motors
Wind Turbines
Hard Drives
Magnetic R. Scanners
Magnetic Separator

Production process

Neodymium magnets go through different stages until reaching the final product:

  1. The raw materials are introduced in a mold where they are later melted and distributed in molds so that later they are given a solid form when they cool.
  2. Then, a very fine octopus is created, from the previous physical form that goes through the sintering phase, passing to the liquid state. In the sintering phase, the particles align and fall together to create dense pieces.
  3. These pieces finally obtained are in the form and the size we want.
  4. Finally, the neodymium magnet is magnetized and the magnet that we all know is made.

Once we have finished following all these steps, a certificate of quality must be issued to ensure that the neodymium magnet has been manufactured correctly.

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