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Sintered NdFeB Magnets

Sintered NdFeB magnets, sintered neodymium magnets, are those rare earth neodymium magnets manufactured by powder metallurgical process (smelting-milling-pressing-sintering). They are the strongest permanent magnets in the world, their maximum product energy (BH)max can reach as high as 52 MGOe (414 kJ/m3) at room temperature. Sintered NdFeB magnets are indispensable permanent magnets in the current high-tech and clean technology fields, especially for various high-efficiency motors, electric vehicles, wind turbines, computers and consumer electronics. To strengthen their corrosion resistance, regular sintered NdFeB magnets are usually plated with zinc, nickel/NiCuNi and epoxy coatings, respectively.

custom magnet NdFeB arc magnet with zinc coating
zinc coated NdFeB arc magnet
NdFeB segment magnet with nicuni coating
nickel coated NdFeB segment magnet
custom magnet block NdFeB rare earth magnet with epoxy coating
epoxy coated NdFeB block magnet
custom magnet NdFeB ring magnet with nickel coating
NiCuNi coated NdFeB ring magnet
neodymium ring magnet with zinc coating
Zn plated NdFeB ring magnet
disc neodymium rare earth magnet with nickel coating
NiCuNi plated NdFeB disc magnet

Sintered NdFeB Magnets’ Grades, Magnetic Properties

Magnet
Grade[1]		 Max. Energy Product
(BH)max		 Residual Induction
Br		 Coercive Force
Hcb		 Intrinsic Coercivity
Hcj		 Max. Operating
Temperature[2]
MGOe kJ/m3 kGs T kOe kA/m kOe kA/m °C °F
N52 50-53 398-422 14.2-14.8 1.42-1.48 ≥10.5 ≥836 ≥11 ≥876 70 158
N50 48-51 382-406 13.9-14.4 1.39-1.44 ≥10.8 ≥859 ≥12 ≥955 80 176
N50M 48-51 382-406 13.9-14.4 1.39-1.44 ≥13.0 ≥1035 ≥13 ≥1035 90 194
N50H 48-51 382-406 13.9-14.4 1.39-1.44 ≥13.0 ≥1035 ≥16 ≥1273 110 230
N48 46-49 366-390 13.7-14.2 1.37-1.42 ≥11.6 ≥923 ≥12 ≥955 80 176
N48M 46-49 366-390 13.7-14.2 1.37-1.42 ≥12.8 ≥1019 ≥14 ≥1114 100 212
N48H 46-49 366-390 13.7-14.2 1.37-1.42 ≥12.8 ≥1019 ≥17 ≥1353 120 248
N48SH 46-49 366-390 13.7-14.2 1.37-1.42 ≥12.8 ≥1019 ≥20 ≥1592 150 302
N45 43-46 342-366 13.2-13.7 1.32-1.37 ≥11.6 ≥923 ≥12 ≥955 80 176
N45M 43-46 342-366 13.2-13.7 1.32-1.37 ≥12.5 ≥995 ≥14 ≥1114 100 212
N45H 43-46 342-366 13.2-13.7 1.32-1.37 ≥12.5 ≥995 ≥17 ≥1353 120 248
N45SH 43-46 342-366 13.2-13.7 1.32-1.37 ≥12.5 ≥995 ≥20 ≥1592 150 302
N45UH 43-46 342-366 13.2-13.7 1.32-1.37 ≥12.6 ≥1003 ≥25 ≥1990 180 356
N42 40-43 318-342 12.8-13.2 1.28-1.32 ≥11.4 ≥907 ≥12 ≥955 80 176
N42M 40-43 318-342 12.8-13.2 1.28-1.32 ≥12.0 ≥955 ≥14 ≥1114 100 212
N42H 40-43 318-342 12.8-13.2 1.28-1.32 ≥12.0 ≥955 ≥17 ≥1353 120 248
N42SH 40-43 318-342 12.8-13.2 1.28-1.32 ≥12.0 ≥955 ≥20 ≥1592 150 302
N42UH 40-43 318-342 12.8-13.2 1.28-1.32 ≥12.2 ≥971 ≥25 ≥1990 180 356
N40 38-41 302-326 12.4-12.9 1.24-1.29 ≥11.4 ≥907 ≥12 ≥955 80 176
N40M 38-41 302-326 12.4-12.9 1.24-1.29 ≥11.6 ≥923 ≥14 ≥1114 100 212
N40H 38-41 302-326 12.4-12.9 1.24-1.29 ≥11.6 ≥923 ≥17 ≥1353 120 248
N40SH 38-41 302-326 12.4-12.9 1.24-1.29 ≥11.6 ≥923 ≥20 ≥1592 150 302
N40UH 38-41 302-326 12.4-12.9 1.24-1.29 ≥11.8 ≥939 ≥25 ≥1990 180 356
N40EH 38-41 302-326 12.4-12.9 1.24-1.29 ≥11.8 ≥939 ≥30 ≥2388 200 392
N38 36-39 286-310 12.2-12.6 1.22-1.26 ≥11.2 ≥891 ≥12 ≥955 80 176
N38M 36-39 286-310 12.2-12.6 1.22-1.26 ≥11.3 ≥899 ≥14 ≥1114 100 212
N38H 36-39 286-310 12.2-12.6 1.22-1.26 ≥11.3 ≥899 ≥17 ≥1353 120 248
N38SH 36-39 286-310 12.2-12.6 1.22-1.26 ≥11.3 ≥899 ≥20 ≥1592 150 302
N38UH 36-39 286-310 12.2-12.6 1.22-1.26 ≥11.5 ≥915 ≥25 ≥1990 180 356
N38EH 36-39 286-310 12.2-12.6 1.22-1.26 ≥11.5 ≥915 ≥30 ≥2388 200 392
N35 33-36 263-286 11.7-12.2 1.17-1.22 ≥10.8 ≥859 ≥12 ≥955 80 176
N35M 33-36 263-286 11.7-12.2 1.17-1.22 ≥10.9 ≥867 ≥14 ≥1114 100 212
N35H 33-36 263-286 11.7-12.2 1.17-1.22 ≥10.9 ≥867 ≥17 ≥1353 120 248
N35SH 33-36 263-286 11.7-12.2 1.17-1.22 ≥10.9 ≥867 ≥20 ≥1592 150 302
N35UH 33-36 263-286 11.7-12.2 1.17-1.22 ≥11.1 ≥883 ≥25 ≥1990 180 356
N35EH 33-36 263-286 11.7-12.2 1.17-1.22 ≥11.1 ≥883 ≥30 ≥2388 200 392
N35AH 33-36 263-286 11.7-12.2 1.17-1.22 ≥11.1 ≥883 ≥35 ≥2786 230 446
N33 31-34 247-271 11.3-11.8 1.13-1.18 ≥10.5 ≥836 ≥12 ≥955 80 176
N33M 31-34 247-271 11.3-11.8 1.13-1.18 ≥10.5 ≥836 ≥14 ≥1114 100 212
N33H 31-34 247-271 11.3-11.8 1.13-1.18 ≥10.5 ≥836 ≥17 ≥1353 120 248
N33SH 31-34 247-271 11.3-11.8 1.13-1.18 ≥10.5 ≥836 ≥20 ≥1592 150 302
N33UH 31-34 247-271 11.3-11.8 1.13-1.18 ≥10.7 ≥851 ≥25 ≥1990 180 356
N33EH 31-34 247-271 11.3-11.8 1.13-1.18 ≥10.7 ≥851 ≥30 ≥2388 200 392
N33AH 31-34 247-271 11.3-11.8 1.13-1.18 ≥10.7 ≥851 ≥35 ≥2786 230 446
N30 28-31 223-247 10.8-11.3 1.08-1.13 ≥10.0 ≥796 ≥12 ≥955 80 176
N30M 28-31 223-247 10.8-11.3 1.08-1.13 ≥10.0 ≥796 ≥14 ≥1114 100 212
N30H 28-31 223-247 10.8-11.3 1.08-1.13 ≥10.0 ≥796 ≥17 ≥1353 120 248
N30SH 28-31 223-247 10.8-11.3 1.08-1.13 ≥10.0 ≥796 ≥20 ≥1592 150 302
N30UH 28-31 223-247 10.8-11.3 1.08-1.13 ≥10.2 ≥812 ≥25 ≥1990 180 356
N30EH 28-31 223-247 10.8-11.3 1.08-1.13 ≥10.2 ≥812 ≥30 ≥2388 200 392
N30AH 28-31 223-247 10.8-11.3 1.08-1.13 ≥10.2 ≥812 ≥35 ≥2786 230 446
N28AH 26-29 207-231 10.4-10.9 1.04-1.09 ≥9.8 ≥780 ≥35 ≥2786 230 446

[1] In a sintered NdFeB magnet grade code, “N” means it is a neodymium magnet, the following number is typical (BH)max value of this neodymium magnet, the end with “M/H/SH/UH/EH/AH” (abbr. for medium/high/super high/ultra high/extreme high/abnormal high, regular is default) indicates intrinsic coercivity class of this neodymium magnet.
[2] Maximum operating temperature is strongly related to the load line/Pc (permeance coefficient) and operating environment of a neodymium magnet.
* The values in this sheet are for reference only, neodymium magnets can be tailored as per customers’ specific requirements.