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What do the specifications N40, N42, N45, etc. mean? | |||||
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The specifications N40, N42, N45, N45H etc. is a measurement for the quality of the magnet material. You can read two things from this:
The numbers (e.g., 40, 42, 45) are equivalent to approximately the maximum energy product of the magnet (in MGOe). The letters N, M, H and respectively the letters SH, EH or UH 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 should be used at 80 °C. When we speak colloquially about the "power" of a magnet, we usually mean either the holding strength by direct contact with a metal plate or the attractive force to a piece of iron (or another magnet) at a certain range. For this "power", the applied magnet material is not decisive in and of itself, but equally important is the volume of the magnet, the form of the magnet, the proportions of the magnet (e.g., the ratio between the diameter and the thickness of a disc magnet) and the combination with other materials, so e.g., the magnet is mounted on a piece of metal, in a metal pot, or is "free-standing". This is similarly true in relationship to working temperature. The specified maximum temperature can only be used without a problem when the aspect ratio of the magnet is "optimal". If a magnet is, for example, too thin in relation to its diameter (or side length), the maximum temperature is reached earlier. If you take any two magnets of differing size 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. For this reason, the larger magnet is the stronger magnet, even when its magnetisation classification is somewhat smaller. You can find the exact associations between these classifications and the physical values of a magnet in the table Physical magnet data.
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