The grade of NdFeB magnet is mainly classified according to its maximum magnetic energy product, and also related to the temperature resistance of the magnet. The following is a detailed explanation of the grades of NdFeB magnets:

I. Divided by maximum magnetic energy area

The grade of NdFeB magnet usually starts with N, followed by a number which indicates the maximum magnetic energy product of the magnet. The larger the number, the stronger the magnet's magnetic properties. The common grades are N35, N38, N42, N45, N50, N52 and so on. In fact, under the N35 grade, there are many low performance grades, such as: N25/N28/N30/N33. Among them, N52 is the highest grade commonly found in the market, and there is N54 above N52.

II. According to the division of temperature resistance performance

In addition to the maximum magnetic energy product grades, NdFeB magnets can also be divided according to temperature resistance. The letter behind the grade represents the temperature resistance of the magnet, and the common letters and corresponding temperature resistance ranges are as follows:

l  N: Standard temperature grade, the maximum working temperature is usually 80 degrees Celsius.

l  M: Slightly higher temperature rating, maximum operating temperature is usually 100 degrees Celsius.

l  H: Higher temperature grade, maximum working temperature is usually 120 degrees Celsius.

l  SH: High temperature resistant grade, maximum working temperature usually 150 degrees Celsius.

l  SH-T: Higher temperature resistant grade with a maximum working temperature of typically 160 degrees Celsius.

l  UH: Higher temperature resistant grade with a maximum working temperature of typically 180°C.

l  UH-T: A further temperature resistant grade with a maximum working temperature of typically 190 degrees Celsius.

l  EH: Extremely high temperature class, maximum operating temperature typically 200 degrees Celsius.

l  AH: the highest temperature resistance grade, the maximum working temperature is usually 220 degrees Celsius.

In summary, the grade of NdFeB magnets can be divided into the above categories according to the maximum magnetic energy product and temperature resistance. When choosing magnets, you should choose the right grade according to the specific application scenarios and needs.