The neodymium magnets, together with the samarium magnets, are part of the rare earth group and represent the latest generation of magnetic materials. These magnets have properties very superior to the traditional ones, being at the moment the most powerful magnets of the market.


High precision neodymium magnets form a wide range of shapes, sizes and grades.

Neodymium BlocksNeodymium DiscsNeodymium RingsNeodymium SegmentsNeodymium SpheresSpecial Geometry


The characteristics of the neodymium magnets are shown in the following table of qualities. It indicates the remanence of the magnets, the coercive force, the working temperatures and the minimum and maximum resistance.


GradeNomenclatureRemanenceCoercive forceIntrinsic coerciveMaxium energy productWorking temp
BrbHcFuerza Ihc(BH) max
Neodimyum MagnetsBr 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 N33 anistropicN33NdFeB  247/961,141,1782087695524726380
NdFeB N35 anistropicN35NdFeB  263/961,171,2086090095526327980
NdFeB N38 anistropicN38NdFeB  287/961,221,2690091595528730380
NdFeB N40 anistropicN40NdFeB  303/961,261,2990892495530331880
NdFeB N42 anistropicN42NdFeB  318/961,291,3191593995531833480
NdFeB N45 anistropicN45NdFeB  342/961,331,3692495595534235880
NdFeB N48 anistropicN48NdFeB  367/881,381,4081086087536738380
NdFeB N50 anistropicN50NdFeB  383/881,401,4379486087538339880
NdFeB N52 anistropicN52NdFeB  398/881,421,4579486087539841480
NdFeB N35M anistropicN35MNdFeB  263/1111,171,208689001114263279100
NdFeB N38M anistropicN38MNdFeB  287/1111,221,269009391114287303100
NdFeB N40M anistropicN40MNdFeB  303/1111,261,299249551114303318100
NdFeB N42M anistropicN42MNdFeB  318/1111,291,329559871114318334100
NdFeB N45M anistropicN45MNdFeB  342/1111,331,3597110031114342358100
NdFeB N30H anistropicN30HNdFeB  223/1351,081,127948361353223239120
NdFeB N33H anistropicN33HNdFeB  247/1351,141,178368761353247263120
NdFeB N35H anistropicN35HNdFeB  263/1351,171,208689001353263279120
NdFeB N38H anistropicN38HNdFeB  287/1351,221,269009391353287303120
NdFeB N40H anistropicN40HNdFeB  303/1351,261,289249551353303318120
NdFeB N42H anistropicN42HNdFeB  318/1351,281,309559871353318334120
NdFeB N33SH anistropicN33SHNdFeB  247/1601,141,178448761595247263150
NdFeB N35SH anistropicN35SHNdFeB  263/1601,171,208769001595263279150
NdFeB N38SH anistropicN38SHNdFeB  287/1601,221,259089391595287303150
NdFeB N40SH anistropicN40SHNdFeB  303/1601,251,279399631595303318150
NdFeB N42SH anistropicN42SHNdFeB  318/1601,281,309559871595318334150
NdFeB N33UH anistropicN33UHNdFeB  247/1991,131,158448761990247263180
NdFeB N35UH anistropicN35UHNdFeB  263/1991,171,198769001990263279180
NdFeB N38UH anistropicN38UHNdFeB  287/1991,221,259089391990287303180
NdFeB N28EH anistropicN28EHNdFeB  207/2391,041,087808112388207223200
NdFeB N30EH anistropicN30EHNdFeB  223/2391,081,128048442388223239200
NdFeB N33EH anistropicN33EHNdFeB  247/2391,131,158448762388247263200
NdFeB N30AH anistropicN30AHNdFeB  223/2631,081,128048442626223239220
NdFeB N33AH anistropicN33AHNdFeB  247/2631,131,158448762626247263220
NdFeB N34AH anistropicN34AHNdFeB  247/2551,101,168369002547247271220
NdFeB N35AH anistropicN35AHNdFeB  263/2631,171,198769152626263279220

Type of material

Rare Earth



Neodymium (Nd)
Iron (Faith)
Boron (B)


Work temperature

From 80ºC to 200ºC



Powerful magnets
High coercivity and remanence
Application in confined spaces


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

Neodymium magnets in equal size with other magnets, such as ferrite, are stronger, even in some cases, being smaller, can withstand more strength.

Work temperature:

The temperature is one of the factors to take into account in the application of the magnet.

Currently in IMA we have a wide range of magnets that cover temperatures from 80ºC to 200ºC in Neodymium, from 200ºC to 350ºC, we have the alternative of Samario magnets.


NíquelNi+NI10-20 µmSilver (bright)Excellent resistance to the humid atmosphere200°C
 Ni+Cu+NI  Resistance superior to the humid atmosphere 
ZincZn azul8-20 µmBlue-silverGood resistance to salinity 
Color ZnExcellent resistance to salinity160°C
EstañoNi+Cu+Sn15-20 µmSilver brightResistance superior to the humid atmosphere160°C
CobreNi+Cu10-20 µmgoldTemporary treatment 
EpoxiNi+Cu+epoxy15-25 µmblackExcellent resistance to weather and salinity120°C

An additional protection for the neodymium magnet will ensure long-term maintenance and durability, avoiding losing its properties and possible corrosion by external or atmospheric chemical agents.

The solution is the coating of the magnet by means of a coating that can be made of different materials such as epoxy, nickel, zinc, copper and others. In this way, the magnet can withstand lower temperatures and prevent its oxidation.


The set of magnetic properties offered by neodymium magnets allows multiple applications, through great strength and better performance than other materials such as ferrite or alnico:

The manufacture of this magnet by sintering, allows us to achieve a wide variety of designs and shapes, to meet the needs of customers.img_motores_electricoELECTRIC MOTORSimg_turbinas_eolicasWIND TURBINESimg_discos_durosHARD DRIVESimg_altavocesSPEAKERSimg_auricularesHEADPHONESimg_escaneresMAGNETIC R. SCANNERSimg_sensoresSENSORSimg_generadoresGENERATORSimg_separadoresMAGNETIC SEPARATOR


Neodymium magnets must go through different stages of the production process to be subsequently distributed and meet the needs of our customers.

In the first instance, the raw materials or rare earths are introduced in an oven where they are melted, casting the material obtained in molds and cooling it to create solid pieces. A very fine powder is then produced from the solid mass obtained above, which passes through the sintering phase where the state changes to liquid. In this process, the particles are magnetically aligned and bound together to create dense pieces. These pieces are heat treated, cut to the desired shape and size, and finally, subjected to treatments against corrosion. Finally, they magnetize and the magnet is created. That subsequently, it is tested to certify its quality.