What does the N Rating mean for Magnet?

Probably, you have come across the letter “N” in some magnet grades. Maybe, you are wondering what it is or why the letter is important.

Well, we will explain everything you need to know about N rating in magnets.

N Rating for Magnets Basics

If you review the neodymium permanent magnets datasheet, you will realize their grades range from N35 to N55.

Neodymium magnet grade
Neodymium Magnet Grade

That is to say, there is always the letter “N” before the numbers. It is this letter that we refer to as the N “rating” for these types of magnets.

For all rare-earth permanent magnets, the letter N is common across all grades. It usually indicates the magnet is neodymium. However, the digits that follow express other characteristics such magnet’s strength or the maximum energy it produces.

Simply put, the “N” refers to the type of material. In this case, a rare-earth material for magnets – neodymium.

The same applies to other types of magnets where you will find:

  • C – for ceramic magnets
  • SmCo – samarium cobalt magnets

 Magnet Pole vs Neodymium Magnets Rating

At the same time, you should not get this wrong. Remember, when describing magnet properties, there are regions where the external magnetic field is strongest. We refer to these regions as poles.

So, when discussing magnet poles, we may mention N and S poles. In this case, it simply implies the N-pole to mean North poles and the S-pole to mean South Pole.

It is quite different from the N rating for magnets. Where N denotes, the maximum energy product of the magnet material (maximum strength of the material). But of course, the actual strength of the Neo magnets also depends on grade type, shape, and size.

Comparing N Rating for Magnets

 

When rating the neodymium magnets, we have N35 up to say N55. As mentioned earlier, a lower digit after the letter N implies lower performance. However, a higher digit after the letter N implies higher performance.

Let’s have a quick look at the example below:

Neodymium Magnet Grade Remanence (KGS) Coercive Force (kOe) Intrinsic Coercive Force (kOe) Maximum Energy Product (MGOe) Maximum Operating Temperature
N35 11.7 – 12.2 ≥ 10.9 ≥ 12 33-36 80 °C
N40 12.5 – 12.8 ≥ 11.4 ≥ 12 38 – 41 80 °C
N48 13.8 – 14.2 ≥ 11.6  ≥ 12 46 – 49 80 °C
N52 14.3 – 14.8 ≥  10  ≥ 11 50 – 52 80 °C

 

In short, the letter “N” alongside digits, simply indicates the magnet material and rated magnetic strength.

More Resources:

Neodymium Magnets – Source: BEMAGNET

Rare Earth Magnets – Source: Wikipedia

Magnet Grades – Source: BEMAGNET

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