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What do the specifications N42, N45, N50, etc. mean?

The specifications N40, N42, N45, 35H etc. is a measurement for the quality of the magnet material. This tells you two things:
  1. Up to what temperature the magnet can be used
  2. How much "magnetic energy" per volume is contained in this magnet material

The letters N, M, H, SH, UH or EH indicate the maximum working temperature of a magnet. Most of our magnets begin with the letter "N" and can thus withstand temperatures of up to 80 °C. You can find out which letter corresponds to which maximum working temperature under FAQ "What temperatures can magnets withstand?".
The numbers (e.g., 40, 42, 45) are equivalent to approximately the maximum energy product of the magnet (in MGOe). They are an indicator of magnet strength. According to the current state of the art, the grade 52 corresponds to the largest possible maximum energy product of a permanent magnet.
You can find the exact correlations between these classifications and the physical values of a magnet in the table Physical magnet data.

Magnetisation vs. Size

If you take any two magnets of different sizes and magnetisation from our assortment, the difference in their strength is more based on the differences in their volume than the differences in their magnetisation. That's why the larger magnet is mostly the stronger magnet, even when its magnetisation classification is somewhat smaller.

Neodymium magnets sorted by magnetisation

Are you looking for a neodymium magnet with a specific grade? Below you can find all neodymium magnets in our assortment grouped by magnetisation:

Additional information about magnets

The following FAQs could also be of interest to you: