Hyab | Neodymium material specification

Neodymium material specification

Contents in NdFeb

Sintered neodymium magnets are composed primarily of neodymium, iron, and boron. The chemical formula Nd2Fe14B represents the basic composition of these magnets. Neodymium is a rare-earth element, while iron and boron are common ferromagnetic materials. This combination results in a powerful magnetic field that surpasses that of other types of magnets.

More exact composition of a NdFeB magnet is (a few % differ from each batch): Neodymium [Nd]: 35%, Iron [Fe]: 61%, Boron [B]: 1.2%, Dysprosium [Dy]: 0.8%, Copper [Cu]: 0.2%, Aluminium [Al]: 0.9%, Gallium [Ga]: 0.9%.

Energy product (BHmax)

Sintered neodymium magnets are most known for their remarkable magnetic properties. They have extremely high magnetic strength, often characterized by their maximum energy product (BHmax), which is a measure of the magnetic energy stored in the material. This is measured in Mega Gauss Oersteds, or MGOe. NdFeB magnets can have BHmax values that are significantly higher than other permanent magnets, making them ideal for applications where strong magnetic fields are required in a compact form.

To make it simple, the energy product is specified as N35, N38, N40, N42, N45, N48, N50 and N52. Our standard neodymium grade is N36. The higher number, the stronger magnet. As for now the strongest available neodymium grade is N52. See our Neodymium material table below for all different Neodymium grades.

To compare strength of different materials, see the MGOe specification. For example, ferrite go from approx 3 -5 MGOe and Neodymium go from 31 - 53 MGOe, which means Neodymium is approx 10 times the strength of a ferrite magnet in the same volume.

Working temperature (Coercivity, HcJ)

When you look at the magnet table of available materials there are different letters after some of the grades. These letters represent the magnet’s ability to withstand demagnetization forces, which can be temperature or other magnetic forces working against the magnet. We define the coercive force using the most common system, the lettering system. This letter system uses the following letters after the grade to define the magnets specification to fight demagnetization forces: M, H, SH, UH, EH, and AH.

When a letter is used after a magnet grade, it indicates that that specific material has a greater ability to fight demagnetizing forces. For our purpose, we are going to use heat as the demagnetizing force as it is most common force effecting the magnet. And, the following examples are “general rules” and not “hard and set rules”.

A Neodymium Magnet with no letter after the grade, i.e. N38, or N45, or N52, would indicate that it has the ability to work in an environment that has a maximum operating temperature no greater than 80C. A magnet with an “M” (i.e. N35M, N42M, etc.) generally means that a magnet can be used in an operating environment up to 100C. An “H” material is good up to 120C, “SH” up to 150C, “UH” up to 180C, “EH” up to 200C, and a “AH” up to 220C. Again, these are general specifications and other factors do play a role in coercivity decisions - like Permeance Coefficient (Pc).

Permeance Coefficient (Pc)

The permeance coefficient measures how easily magnetic flux flows through a material. It quantifies the ability of a material to conduct magnetic flux. A higher permeance coefficient means the material allows magnetic flux to pass through more easily, while a lower coefficient indicates less permeability to magnetic flux. In simpler terms, it's like a measure of how friendly a material is to magnetic fields, determining how effectively it can channel or resist other magnetic forces.

What this means in practice is that a thinner cylinder magnet (lower Pc) will be demagnetized by heat faster than a thicker/taller (higher Pc) cylinder magnet. And depending on the Pc value, the thinner magnet may demagnetize before its rated maximum operating temperature. At the same time, a thicker magnet can exceed the maximum working temperature without being affected.

Surface treatment / coating

NdFeB-magnets oxidate easily, therefore the magnets are always delivered with a galvanic coating. Our standard range is coated with nickel or zinc. What distinguishes Zn (Zinc) and NiCuNi (Nickel-Copper-Nickel) from eachother is that Zn can have a slighty better adhesion when it comes to gluing and taping. If the magnet is to be in a humid environment, we recommend a nickel-epoxy treatment.

See our coating page to decide which surface treatment is best for your application!

Neodymium grade table

Material grade	Remanence		Coercivity				Max energy product		Working temperature
	Br		HcB		HcJ		(BH)max		Working temperature
	Gauss (kG)	Tesla (T)	kOe	kA/m	kOe	kA/m	kJ/m3	MGOe	°C
N33	11.3 - 1.17	1.13 - 1.17	10.5	≥836	12	≥955	247 - 271	31 - 34	≤80
N35	11.7 - 12.2	1.17 - 1.22	10.9	≥868	12	≥955	263 - 287	33 - 36	≤80
N36	12.1 - 12.3	1.21 - 1.23	11.0	≥875	12	≥955	280 - 298	35 - 37	≤80
N38	12.2 - 12.5	1.22 - 1.25	11.3	≥899	12	≥955	287 - 310	36 - 39	≤80
N40	12.5 - 12.8	1.25 - 1.28	11.4	≥907	12	≥955	302 - 326	38 - 41	≤80
N42	12.8 - 13.2	1.28 - 1.32	11.5	≥915	12	≥955	318 - 342	40 - 43	≤80
N45	13.2 - 13.8	1.32 - 1.38	11.6	≥920	12	≥955	342 - 366	43 - 46	≤80
N48	13.8 - 14.2	1.38 - 1.42	11.6	≥923	12	≥955	366 - 390	46 - 49	≤80
N50	14.0 - 14.5	1.40 - 1.45	10.5	≥796	12	≥876	382 - 406	48 - 51	≤80
N52	14.3 - 14.8	1.43 - 1.48	10.0	≥796	12	≥876	398 - 422	50 - 53	≤80
N33M	11.3 - 11.7	1.13 - 1.17	10.5	≥836	14	≥1114	247 - 271	31 - 34	≤100
N35M	11.7 - 12.2	1.17 - 1.22	10.9	≥836	14	≥1114	263 - 287	33 - 36	≤100
N38M	12.2 - 12.5	1.22 - 1.25	11.3	≥899	14	≥1114	287 - 310	36 - 39	≤100
N40M	12.5 - 12.8	1.25 - 1.28	11.6	≥923	14	≥1114	302 - 326	38 - 41	≤100
N42M	12.8 - 13.2	1.28 - 1.32	12.0	≥955	14	≥1114	318 - 342	40 - 43	≤100
N45M	13.2 - 13.8	1.32 - 1.38	12.5	≥836	14	≥1114	342 - 366	42 - 46	≤100
N48M	13.6 - 14.3	1.36 - 14.3	12.9	≥1027	14	≥1114	366 - 390	46 - 49	≤100
N50M	14.0 - 14.5	1.40 - 1.45	13.0	≥1033	14	≥1114	382 - 406	48 - 51	≤100
N52M	14.2 - 14.8	1.42 - 1.48	13.2	≥1036	14	≥1114	398 - 422	50 - 53	≤100
N30H	10.8 - 11.3	1.08 - 1.13	10.0	≥796	17	≥1353	223 - 247	28 - 31	≤120
N33H	11.3 - 11.7	1.13 - 1.17	10.5	≥836	17	≥1353	247 - 271	31 - 34	≤120
N35H	11.7 - 12.2	1.17 - 1.22	10.9	≥868	17	≥1353	263 - 287	33 - 36	≤120
N36H	12.1 - 12.3	1.21 - 1.23	11.0	≥875	17	≥1353	280 - 298	35 - 37	≤120
N38H	12.2 - 12.5	1.22 - 1.25	11.3	≥899	17	≥1353	287 - 310	36 - 39	≤120
N40H	12.5 - 12.8	1.25 - 1.28	11.6	≥923	17	≥1353	302 - 326	38 - 41	≤120
N42H	12.8 - 13.2	1.28 - 1.32	12.0	≥955	17	≥1353	318 - 342	40 - 43	≤120
N45H	13.2 - 13.7	1.32 - 1.37	12.2	≥963	17	≥1353	342 - 368	43 - 46	≤120
N48H	13.6 - 14.3	1.36 - 1.43	12.5	≥995	17	≥1353	366 - 390	46 - 49	≤120
N50H	14.0 - 14.5	1.40 - 1.45	12.6	≥1000	17	≥1270	382 - 406	48 - 51	≤120
N30SH	10.8 - 11.2	1.08 - 1.12	10.1	≥804	20	≥1592	223 - 243	28 - 32	≤150
N33SH	11.3 - 11.7	1.13 - 1.17	10.6	≥844	20	≥1592	247 - 271	31 - 34	≤150
N35SH	11.7 - 12.2	1.17 - 1.22	11.0	≥876	20	≥1592	263 - 287	33 - 36	≤150
N36SH	12.1 - 12.3	1.21 - 1.23	11.3	≥900	20	≥1592	280 - 298	35 - 37	≤150
N38SH	12.2 - 12.5	1.22 - 1.25	11.4	≥907	20	≥1592	287 - 310	36 - 39	≤150
N40SH	12.5 - 12.8	1.25 - 1.28	11.8	≥939	20	≥1592	302 - 326	38 - 41	≤150
N42SH	12.8 - 13.2	1.28 - 1.32	12.4	≥987	20	≥1592	318 - 342	40 - 43	≤150
N45SH	13.2 - 13.8	1.32 - 1.38	12.6	≥1003	20	≥1592	342 - 366	43- 46	≤150
N48SH	13.6 - 14.2	1.36 - 1.42	12.8	≥1018	20	≥1592	366 - 390	46 - 49	≤150
N30UH	10.8 - 11.3	1.08 - 1.13	10.2	≥812	25	≥1990	223 - 247	28 - 31	≤180
N33UH	11.3 - 11.8	1.13 - 1.18	10.5	≥836	25	≥1990	247 - 271	31 - 34	≤180
N35UH	11.7 - 12.2	1.17 - 1.22	10.8	860	25	≥1990	263 - 287	33 - 36	≤180
N38UH	12.2 - 12.5	1.22 - 1.25	11.0	876	25	≥1990	287 - 310	36 - 39	≤180
N40UH	12.5 - 12.8	1.25 - 1.28	11.5	899	25	≥1990	302 - 326	38 - 41	≤180
N42UH	12.8 - 13.2	1.28 - 1.32	11.8	≥940	25	≥1990	318 - 342	40 - 43	≤180
N28EH	10.2 - 10.8	1.02 - 1.08	9.8	≥780	30	≥2388	207 - 231	26 -29	≤200
N30EH	10.8 - 11.3	1.08 - 1.13	10.2	≥812	30	≥2388	223 - 247	28 - 31	≤200
N33EH	11.3 - 11.7	1.13 - 1.17	10.5	≥836	30	≥2388	247 - 271	31 - 34	≤200
N35EH	11.7 - 12.2	1.17 - 1.12	10.8	≥864	30	≥2388	263 - 287	33 - 36	≤200
N36EH	12.1 - 12.3	1.21 - 1.23	11.0	≥875	30	≥2388	280 - 298	35 - 37	≤200
N36EH	12.1 - 12.3	1.21 - 1.23	11.0	≥875	30	≥2388	280 - 298	35 - 37	≤200
N36EH	12.1 - 12.3	1.21 - 1.23	11.0	≥875	30	≥2388	280 - 298	35 - 37	≤200
N38EH	12.2 - 12.5	1.22 - 1.25	11.3	≥899	30	≥2388	287 - 310	36 - 39	≤200
N40EH	12.5 - 12.8	1.25 - 1.28	11.5	≥915	30	≥2388	247 - 271	38 - 41	≤200
N30AH	10.8 - 11.3	1.08 - 1.13	10.5	≥819	35	≥2785	263 - 287	28 - 31	≤230
N33AH	11.3 - 11.7	1.13 - 1.17	10.8	≥843	35	≥2785	287 - 310	31 - 34	≤230
N35AH	11.7 - 12.2	1.17 - 1.22	11.0	≥876	35	≥2785	263 - 287	33 - 36	≤230

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