More about Magnetization and the Quality

Magnetisering kwaliteit

Meanings of expressions

What is the meaning of the expressions N40, N42, N45, etc.? ? These expressions are a measure of the quality of the magnetic material used. From this, one can tell two things, namely how much “magnetic energy” per volume is stored in this magnetic material and up to what maximum temperature the magnet can be used.


The number (e.g. 40, 42,45) corresponds approximately to the maximum energy product of the magnet (in MGOe). The letter N in front of the digits stands for Neodymium and have a maximum operating temperature of 80°C. The letters after the numbers correspond to a maximum use temperature of M=100 °C, H=120 °C, SH=150 °C, EH=180 °C and UH=200 °C. If there is nothing behind it, this is automatically 80 °C.

When we talk about the “strength” of a magnet, we usually mean either the holding power when in direct contact with a metal plate, or the attraction to a piece of iron (or other magnet) at a certain distance. The “strength” does not depend solely on the magnetic material used.

Equally important is the volume of the magnet, the shape of the magnet, the proportions of the magnet (e.g., the ratio of diameter to thickness for a magnetic disc) as well as the combination with other materials, e.g., whether the magnet is mounted on a piece of metal or in a metal pot or is freestanding.

Something similar applies to the operating temperature. The indicated maximum temperature can only be applied without problems if the proportions of the magnet are optimal. For example, when a magnet is very thin in relation to its diameter (or length), the maximum temperature is reached more quickly.

If you take two magnets from our range, which have different size and magnetization, the difference in volume is usually more decisive for the strength of the magnet as the difference in magnetization. Therefore, the larger magnet is usually the stronger one, even when the feature number of the magnetization is smaller. The exact correlation between this prefix and the physical magnetic values can be found in the table.

Remanance Coercivity
Br(T) bHc(kA/m) iHc (BH) max
(KJ/m3)
Quality Max usage temp. Nom Min Nom Min (kA/m) Nom Min
N35 80 1.21 1.17 899 876 955 279 263
N38 80 1.26 1.22 923 876 955 303 287
N40 80 1.29 1.26 923 876 955 318 303
N42 80 1.33 1.3 926 876 955 334 318
N45 80 1.37 1.33 926 876 955 358 342
N48 80 1.42 1.36 926 876 955 382 358
N50 80 1.45 1.41 907 828 876 398 382
N52 80 1.48 1.44 907 828 876 414 394
35M 100 1.21 1.17 915 892 1114 279 263
38M 100 1.26 1.22 931 907 1114 303 287
40M 100 1.29 1.26 947 907 1114 318 303
42M 100 1.33 1.3 947 907 1114 334 318
45M 100 1.37 1.33 955 907 1114 358 334
48M 100 1.42 1.36 955 907 1114 382 358
33H 120 1.17 1.14 876 820 1353 263 247
35H 120 1.21 1.17 907 860 1353 279 263
38H 120 1.26 1.22 947 907 1353 303 287
40H 120 1.29 1.26 947 907 1353 318 303
42H 120 1.33 1.3 947 907 1353 334 318
44H 120 1.36 1.33 947 907 1274 350 334
30SH 150 1.12 1.08 844 804 1592 239 223
33SH 150 1.17 1.14 876 820 1592 263 247
35SH 150 1.21 1.17 907 860 1592 279 263
38SH 150 1.26 1.22 947 907 1592 303 287
40SH 150 1.29 1.26 947 907 1592 318 303
42SH 150 1.33 1.3 947 907 1512 334 318
28UH 180 1.08 1.04 812 780 1990 223 207
30UH 180 1.12 1.08 844 804 1990 239 223
33UH 180 1.17 1.14 876 820 1990 263 247
35UH 180 1.21 1.17 907 860 1990 279 263
38UH 180 1.26 1.22 947 907 1990 303 287
28EH 200 1.08 1.04 812 780 2388 223 207
30EH 200 1.12 1.08 844 804 2388 239 223
33EH 200 1.17 1.14 876 820 2388 263 247
35EH 200 1.21 1.17 907 860 2388 279 263
30AH 220 1.12 1.08 899 804 2786 255 223
35AH 220 1.21 1.17 947 852 2786 287 255