What Does the N Grade Mean for Neodymium Magnets?

What does the N grade mean for neodymium magnets?

In neodymium permanent-magnet grades, the letter N identifies the neodymium–iron–boron material family. The full grade designation provides information about the material's magnetic performance, while an additional suffix can indicate its temperature class.

The number after N, such as N35, N48 or N52, indicates the approximate maximum energy product (BHmax) in megagauss-oersteds (MGOe). A higher grade generally means greater magnetic energy capability for the same volume. For comparable geometry and operating conditions, N52 material can therefore provide stronger magnetic performance than N35.

• N35–N52 grades without a temperature suffix are commonly specified for applications up to around 80 °C, subject to the particular grade, geometry and magnetic circuit.

• N35SH–N45SH grades are commonly rated for higher operating temperatures, up to around 150 °C. The SH suffix identifies this higher-temperature class.

• Other suffixes include UH, commonly rated up to around 180 °C, and EH, commonly rated up to around 200 °C. Always check the manufacturer's grade data and application limits.

The complete designation combines the magnetic material family, energy grade and, where present, temperature class. The N letter on its own does not specify all these properties.