Properties Chart of Neodymium Magnet Grades
High Performance, Super Strong

Properties Chart of Neodymium Magnet Grades

      The performance of neodymium magnets varies widely. The N series is classified by (BH)Max into N35, N38, N40, N42, N45, N48, N50, N52, and N54. According to temperature resistance, there are N (Neodymium) series, M (medium) series, H (high) series, SH (super high) series, UH (ultra high) series, EH (extremely high) series, and AH (advanced high) series. Temperature-resistant neodymium magnets typically have added elements from the same group, such as dysprosium and terbium, which enhance intrinsic coercivity and thus temperature resistance. These magnets are designated by adding a temperature resistance symbol to the N series, such as N35M, which indicates a neodymium magnet with an M temperature rating and (BH)Max of 35.

      The maximum operating temperature for the N series is 80°C, for the M series is 100°C, for the H series is 120°C, for the SH series is 150°C, for the UH series is 180°C, for the EH series is 200°C, and for the AH series is 230°C. However, it is important to note that the maximum operating temperature indicates the temperature at which the neodymium magnet will start to demagnetize. Therefore, avoid using the magnets for extended periods in environments at their maximum operating temperature.

Demagnetization Curve of Grade N42UH Neodymium Magnet Material

What is Br in neodymium magnets?

Br refers to remanence. Remanence is the magnetic induction strength retained within a ferromagnetic material after it has been magnetized to saturation and the external magnetic field is gradually reduced to zero. Its full name is residual magnetic induction (Br, where B stands for magnetic flux density and R stands for remanent). Remanence is determined by the characteristics of the magnet itself, and under specific conditions, the remanence of the same magnet remains unchanged.

What is Hcb in neodymium magnets?

When a magnet undergoes demagnetization due to a reverse magnetic field, the strength of the reverse magnetic field required to reduce the magnetic induction of the magnet to zero is called coercivity (Hcb). It’s like squeezing water out of a sponge until it’s dry—the pressure applied is akin to coercivity. However, it’s important to note that reducing the magnetic induction to zero with a reverse magnetic field does not mean the magnet loses its magnetic properties entirely. Upon removing the reverse magnetic field, the magnet still retains some level of magnetism. The value at which the reverse magnetic field and the magnet’s magnetism cancel each other out is termed coercivity, represented by Hcb. Coercivity is measured in units of Oersted (Oe) or Ampere per meter (A/m) (1 A/m = 79.6 Oe).

What is Hcj in neodymium magnets？

Above, we described the magnet’s coercivity, or Hcb. Now, what is intrinsic coercivity, or Hcj? When the intensity of the reverse magnetic field continues to increase, requiring a stronger field to completely demagnetize the magnet after removing the reverse field, this is known as intrinsic coercivity. According to the law of energy conservation, it can be concluded that Hcj for a magnet is always greater than Hcb. The unit for intrinsic coercivity is also Oersted (Oe) or Ampere per meter (A/m) (1 A/m = 79.6 Oe).

What is (BH)Max in neodymium magnets？

B refers to the magnetic induction strength of a permanent magnet on the demagnetization curve, also known as magnetic flux density. H refers to the intensity of the applied reverse magnetic field. As the name suggests, (BH)Max refers to the maximum product of B and H at a point on the demagnetization curve. Maximum energy product (BH)Max represents the magnetic energy density established between the two magnetic poles of a magnet, that is, the static magnetic energy per unit volume of the gap. It is the maximum value of B multiplied by H (in units of kJ/m3 or MGOe), and its magnitude directly indicates the performance level of the magnet.

Below is the Properties Chart of Neodymium Magnet Grades

GradeBrHcbHcj(BH)MaxMax Working Temperature
TeslakGskA/mkOekA/mkOekJ/m³MGOe℃
N351.17-1.2111.7-12.1876-89911.0-11.3≥955≥12263-27933-35≤80
N381.22-1.2612.2-12.6876-92311.0-11.6≥955≥12287-30336-38≤80
N401.26-1.2912.6-12.9876-92311.0-11.6≥955≥12303-31838-40≤80
N421.30-1.3313.0-13.3876-92611.0-11.6≥955≥12318-33440-42≤80
N451.33-1.3713.3-13.7876-92611.0-11.6≥955≥12342-35843-45≤80
N481.36-1.4213.6-14.2876-92611.0-11.6≥955≥12358-38245-48≤80
N501.41-1.4514.1-14.5828-90710.4-11.4≥876≥11382-39848-50≤60
N521.44-1.4814.4-14.8828-90710.4-11.4≥876≥11394-41449.5-52≤60
N35M1.17-1.2111.7-12.1892-91511.2-11.5≥1114≥14263-27933-35≤100
N38M1.22-1.2612.2-12.6907-93111.4-11.7≥1114≥14287-30336-38≤100
N40M1.26-1.2912.6-12.9907-94711.4-11.9≥1114≥14303-31838-40≤100
N42M1.30-1.3313.0-13.3907-94711.4-11.9≥1114≥14318-33440-42≤100
N45M1.33-1.3713.3-13.7907-95511.4-12.0≥1114≥14334-35842-45≤100
N48M1.36-1.4213.6-14.2907-95511.4-12.0≥1114≥14358-38248-48≤100
N50M1.41-1.4514.1-14.5907-97111.4-12.2≥1114≥14382-39848-50≤80
N52M1.42-1.4814.2-14.8907-97111.4-12.2≥1114≥14394-41450-52≤80
N35H1.17-1.2111.7-12.1860-90710.8-11.4≥1353≥17263-27933-35≤120
N38H1.22-1.2612.2-12.6907-94711.4-11.9≥1353≥17287-30336-38≤120
N40H1.26-1.2912.6-12.9907-94711.4-11.9≥1353≥17303-31838-40≤120
N42H1.30-1.3313.0-13.3907-94711.4-11.9≥1353≥17318-33440-42≤120
N45H1.33-1.3713.3-13.7907-94711.4-11.9≥1353≥17342-35843-45≤120
N48H1.36-1.4213.6-14.2907-97111.4-12.2≥1274≥16358-38245-48≤100
N50H1.41-1.4514.1-14.5907-99511.4-12.5≥1274≥16382-39848-50≤100
N52H1.42-1.4814.2-14.8907-101511.4-13≥1274≥16394-41449.5-52≤100
N35SH1.17-1.2111.7-12.1876-90710.8-11.4≥1592≥20263-27933-35≤150
N38SH1.22-1.2612.2-12.6876-92311.0-11.6≥1592≥20287-30336-38≤150
N40SH1.26-1.2912.6-12.9876-92311.0-11.6≥1592≥20303-31838-40≤150
N42SH1.30-1.3313.0-13.3876-92611.0-11.6≥1592≥20318-33440-42≤150
N45SH1.33-1.3713.3-13.7876-92611.0-11.6≥1592≥20342-35843-45≤150
N48SH1.36-1.4213.6-14.2876-92611.0-11.6≥1592≥20358-38245-48≤120
N50SH1.39-1.4213.9-14.2907-99511.4-12.5≥1592≥20382-39848-50≤120
N35UH1.17-1.2111.7-12.1860-90710.8-11.4≥1990≥25263-27933-35≤180
N38UH1.22-1.2612.2-12.6907-94711.4-11.9≥1353≥17287-30336-38≤180
N40UH1.25-1.2712.5-12.7939-97111.8-12.2≥1990≥25303-31838-40≤180
N42UH1.28-1.3012.8-13.0955-98712.0-12.4≥1990≥25326-34240-42≤180
N35EH1.17-1.2111.7-12.1876-90710.8-11.4≥1592≥20263-27933-35≤200
N38EH1.22-1.2612.2-12.6907-94711.4-11.9≥1353≥17287-30336-38≤200
N40EH1.24-1.2712.4-12.7939-97111.8-12.2≥2388≥30303-31838-40≤200
N42EH1.28-1.3012.8-13.0955-98712.0-12.4≥2388≥30326-34240-42≤200
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