There are many variations and grades of neodymium magnets, each grade also has different properties which will be discussed below.
All neodymium magnets begin with the letter N for neodymium. The number following this represents the maximum energy product of the magnet and is measured in Mega-Gauss Oersteds (MGOe). This number is the primary indicator for the magnets strength. The higher the value of maximum energy product value, the greater the magnetic field that is generated.
There will often be one or two extra letters on the end of a magnet grade and these determine the temperature rating of the magnet. They also represent the maximum operating temperature that the magnet can reach before it starts to lose its permanent magnetism. These numbers should only be used as a guide value as other factors can have an impact on the performance of a magnet at high temperatures. These factors can include size and shape.
When you compare an N42 with an N35 grade neodymium magnet, the N42 would be 20% more magnetic and would be more slightly more expensive.
Again, if you compare an N42 with an N52, the N52 would again be 20% more magnetic than the N42, but would be considerably more expensive as this is one of the highest grades available.
When to use higher grade magnets
Higher grade magnets should be used in applications where the highest performance of magnet is needed. They should also be used when the space available for the magnet is limited and can’t be increased. If the space isn’t limited, it can be more beneficial to use two N42 magnets instead of using one N52 magnet.
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