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When you see neodymium magnets classified as N35, N38, N40, N42, N45, N48, N50, N52. Have you ever
wondered what it means? The letter N short for words neodymium. And the number after N represents the
grade of the magnet. In general, the higher the grade the stronger the magnet. The highest grade so far in
neodymium magnet is N52. If a magnet is labled as N42SH, then 42 depicts the strength of the magnet and SH refers to the temperature rating of the magnet. If the numbers are not followed by any letters, it means
that the magnet is standard temperature neodymium.