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Grades of NdFeB Magnets

Neodymium magnets are graded according to their maximum energy product, which relates to the magnetic flux output per unit volume. Higher values indicate stronger magnets. For sintered NdFeB magnets, there is a widely recognized international classification. Their values range from 28 up to 52. The first letter N before the values is short for neodymium, meaning sintered NdFeB magnets. Letters following the values indicate intrinsic coercivity and maximum operating temperatures (positively correlated with the Curie temperature), which range from default (up to 80 °C or 176 °F) to AH (230 °C or 446 °F).

Grades of sintered NdFeB magnets:

N30 – N52
N30M – N50M
N30H – N50H
N30SH – N48SH
N30UH – N42UH
N28EH – N40EH
N28AH – N35AH