Neodymium Magnet Grades
Neodymium magnets are available in a wide variety of grades such as N42, N52 and N42SH. The grade is a good indicator of the strength of a magnet. In general, higher numbers correlate with a stronger magnet.
It all starts with the letter "N", representing neodymium.
The following number comes from an actual material property, the Maximum Energy Product of the magnet material, expressed in MGOe (Mega Gauss Oersteds). It represents the strongest point on the magnet’s Demagnetization Curve, or BH Curve.
Simply put, the higher the grade, the greater the magnetic field that magnet will generate which equates to more strength.
High Temperature Grades
Neodymium magnets have what is generally considered to be a low maximum temperature resistance. However, there are special grades available that can withstand much higher temperatures than regular neodymium magnets.
High temperature grades are represented by letters tagged onto the end of a magnet grade. These letters represent the temperature rating and maximum operating temperature the magnet can withstand before it begins to lose its magnetic properties permanently.
The maximum operating temperature of each grade is shown in the Temp Rating column below. More information on the Curie Temperature can be found below.
| N Grade | Br (KG) | HcB (KOe) | Hci (KOe) | BHmax (MGOe) | Temp Rating |
| 35 | 11.8-12.2 | ≥10.9 | ≥12.0 |
33-36 | 80°C / 176°F |
| 38 | 12.2-12.6 | ≥11.3 | ≥12.0 | 36-39 | 80°C / 176°F |
| 40 | 12.6-12.9 | ≥11.4 | ≥12.0 | 38-41 | 80°C / 176°F |
| 42 | 12.9-13.3 | ≥11.5 | ≥12.0 | 40-43 | 80°C / 176°F |
| 45 | 13.3-13.7 | ≥11.0 | ≥12.0 | 43-46 | 80°C / 176°F |
| 48 | 13.7-14.1 | ≥10.5 | ≥11.0 | 45-49 | 80°C / 176°F |
| 50 | 14.0-14.5 | ≥10.5 | ≥11.0 | 47-51 | 80°C / 176°F |
| 52 | 14.3-14.8 | ≥10.5 | ≥11.0 | 49-53 | 80°C / 176°F |
| 55 | 14.7-15.1 | ≥10.5 | ≥11.0 | 53-56 | 80°C / 176°F |
| 35M | 11.8-12.2 | ≥10.9 | ≥14.0 | 33-36 | 100°C / 212°F |
| 38M | 12.2-12.6 | ≥11.3 | ≥14.0 | 36-39 | 100°C / 212°F |
| 40M | 12.6-12.9 | ≥11.6 | ≥14.0 | 38-41 | 100°C / 212°F |
| 42M | 12.9-13.3 | ≥12.0 | ≥14.0 | 40-43 | 100°C / 212°F |
| 45M | 13.3-13.7 | ≥12.5 | ≥14.0 | 43-46 | 100°C / 212°F |
| 48M | 13.7-14.1 | ≥12.9 | ≥14.0 | 45-49 | 100°C / 212°F |
| 50M | 14.0-14.5 | ≥13.0 | ≥14.0 | 47-51 | 100°C / 212°F |
| 55M | 14.3-14.7 | ≥13.0 | ≥14.0 | 50-53 | 100°C / 212°F |
| 30H | 10.8-11.3 | ≥10.0 | ≥17.0 | 28-31 | 120°C / 248°F |
| 33H | 11.3-11.7 | ≥10.5 | ≥17.0 | 31-34 | 120°C / 248°F |
| 35H | 11.8-12.2 | ≥10.9 | ≥17.0 | 33-36 | 120°C / 248°F |
| 38H | 12.2-12.6 | ≥11.3 | ≥17.0 | 36-39 | 120°C / 248°F |
| 40H | 12.6-12.8 | ≥11.6 | ≥17.0 | 38-41 | 120°C / 248°F |
| 42H | 12.9-13.3 | ≥12.0 | ≥17.0 | 40-43 | 120°C / 248°F |
| 45H | 13.3-13.7 | ≥12.3 | ≥17.0 | 43-46 | 120°C / 248°F |
| 48H | 13.7-14.1 | ≥12.5 | ≥17.0 | 46-49 | 120°C / 248°F |
| 50H | 14.0-14.3 | ≥13.3 | ≥17.0 | 47-50 | 120°C / 248°F |
| 52H | 14.3-14.7 | ≥13.5 | ≥17.0 | 50-53 | 120°C / 248°F |
| 30SH | 10.8-11.3 | ≥10.1 | ≥20.0 | 28-31 | 150°C / 302°F |
| 33SH | 11.3-11.7 | ≥10.6 | ≥20.0 | 31-34 | 150°C / 302°F |
| 35SH | 11.8-12.2 | ≥11.0 | ≥20.0 | 33-36 | 150°C / 302°F |
| 38SH | 12.2-12.6 | ≥11.4 | ≥20.0 | 36-39 | 150°C / 302°F |
| 40SH | 12.6-12.9 | ≥11.6 | ≥20.0 | 38-41 | 150°C / 302°F |
| 42SH | 12.9-13.3 | ≥12.4 | ≥20.0 | 40-43 | 150°C / 302°F |
| 45SH | 13.2-13.7 | ≥12.6 | ≥20.0 | 42-46 | 150°C / 302°F |
| 48SH | 13.6-14.0 | ≥13.0 | ≥20.0 | 46-49 | 150°C / 302°F |
| 50SH | 14.0-14.5 | ≥13.5 | ≥20.0 | 48-51 | 150°C / 302°F |
| G52SH | 14.2-14.5 | ≥13.7 | ≥24.0 | 49-52 | 150°C / 302°F |
| G54SH | 14.4-14.8 | ≥13.9 | ≥24.0 | 51-54 | 150°C / 302°F |
| 28UH | 10.4-10.8 | ≥9.6 | ≥25.0 | 26-29 | 180°C / 356°F |
| 30UH | 10.8-11.4 | ≥10.1 | ≥25.0 | 28-31 | 180°C / 356°F |
| 33UH | 11.4-11.8 | ≥10.7 | ≥25.0 | 31-34 | 180°C / 356°F |
| 35UH | 11.8-12.2 | ≥10.8 | ≥25.0 | 33-36 | 180°C / 356°F |
| 38UH | 12.2-12.6 | ≥11.3 | ≥25.0 | 36-39 | 180°C / 356°F |
| 40UH | 12.5-12.9 | ≥11.3 | ≥25.0 | 38-41 | 180°C / 356°F |
| 42UH | 12.8-13.3 | ≥11.6 | ≥25.0 | 40-43 | 180°C / 356°F |
| 45UH | 13.2-13.6 | ≥13.0 | ≥25.0 | 43-46 | 180°C / 356°F |
| G45UH | 13.3-13.6 | ≥13.0 | ≥26.0 | 43-46 | 180°C / 356°F |
| G48UH | 13.7-14.7 | ≥13.3 | ≥26.0 | 47-50 | 180°C / 356°F |
| G50UH | 13.9-14.3 | ≥13.5 | ≥26.0 | 47-51 | 180°C / 356°F |
| G52UH | 14.2-14.5 | ≥13.7 | ≥26.0 | 49-52 | 180°C / 356°F |
| G54UH | 14.4-14.8 | ≥13.9 | ≥25.0 | 51-54 | 180°C / 356°F |
| 28EH | 10.4-10.9 | ≥9.8 | ≥30.0 | 26-29 | 200°C / 392°F |
| 30EH | 10.8-11.4 | ≥10.1 | ≥30.0 | 28-31 | 200°C / 392°F |
| 33EH | 11.4-11.8 | ≥10.3 | ≥30.0 | 31-34 | 200°C / 392°F |
| 35EH | 11.8-12.2 | ≥10.5 | ≥30.0 | 33-36 | 200°C / 392°F |
| 38EH | 12.2-12.6 | ≥11.3 | ≥30.0 | 36-39 | 200°C / 392°F |
| 40EH | 12.6-12.9 | ≥11.6 | ≥30.0 | 38-41 | 200°C / 392°F |
| G42EH | 12.9-13.3 | ≥12.7 | ≥30.0 | 40-43 | 200°C / 392°F |
| G45EH | 13.3-13.6 | ≥13.0 | ≥30.0 | 43-46 | 200°C / 392°F |
| G48EH | 13.7-14.1 | ≥13.3 | ≥30.0 | 50-47 | 200°C / 392°F |
| 28AH | 10.4-10.9 | ≥9.8 | ≥35.0 | 26-29 | 230°C / 446°F |
| 30AH | 10.8-11.3 | ≥10.1 | ≥35.0 | 28-31 | 230°C / 446°F |
| 33AH | 11.3-11.8 | ≥10.3 | ≥33.0 | 31-34 | 230°C / 446°F |
| 35AH | 11.8-12.2 | ≥10.5 | ≥33.0 | 33-36 | 230°C / 446°F |
| 38AH | 12.2-12.6 | ≥11.0 | ≥35.0 | 36-39 | 230°C / 446°F |
| G42AH | 12.9-13.3 | ≥13.7 | ≥35.0 | 40-43 | 230°C / 446°F |
| G45AH | 13.3-13.7 | ≥13.0 | ≥35.0 | 43-46 | 230°C / 446°F |
Curie Temperature
The Curie Temperature (wiki) is the temperature at which all magnetization is lost. As the temperature rises above the Maximum Operating Temperature towards the Curie Temperature, some percentage of the magnetization is irreversibly lost.
| N Grade | Maximum Operating Temperature | °Curie Temperature |
| N | 80°C / 176°F | 310°C / 590°F |
| NM | 100°C / 212°F | 340°C / 644°F |
| NH | 120°C / 248°F | 340°C / 644°F |
| NSH | 150°C / 302°F | 340°C / 644°F |
| NUH | 180°C / 356°F | 350°C / 662°F |
| NEH | 200°C / 392°F | 350°C / 662°F |
| NAH | 230°C / 446°F | 350°C / 662°F |