FAQ - Frequently Asked Questions

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 say something about the maximum working temperature, which can be 80, 100, 120, 150, 180 or 200 °C. Most of our magnets begin with an "N" and can take temperatures of up to 80 °C. You can find more detailed information under our FAQ What temperatures can magnets sustain?.
The numbers (e.g., 40, 42, 45) are equivalent to approximately the maximum energy product of the magnet (in MGOe).
You can find the exact associations 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 collection, the difference in their strength is more due to 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.