China permanent magnet manufacturer: www.rizinia.com

Performance parameters of sintered NdFeB magnets

Sintered NdFeB is the most magnetic permanent magnet material in the world today. Compared with traditional permanent magnet materials, it has excellent permanent magnet characteristics and high cost performance. It has been widely used in various industries and has become an indispensable functional material in modern industry.

  • Product features: small size, light weight, corrosion resistance, strong magnetism, and a wide range of applications.
  • Application areas: aerospace, automotive industry, wind power generation, information industry, household appliances, intelligent manufacturing, etc.

Performance parameters of sintered NdFeB magnets

Grade Br Hcb Hcj (BH)max TW
Remanence Coercivity Intrinsic coercivity Maximum magnetic energy product Working temperature
T KGS KA/m KOe KA/m KOe KJ/m3 MGOe
N35 1.17-1.21 11.7-12.1 876-899 11.0-11.3 ≥955 ≥12 263-279 33-25 ≤80
N38 1.22-1.26 12.2-12.6 876-923 11.0-11.6 ≥955 ≥12 287-303 36-38 ≤80
N40 1.26-1.29 12.6-12.9 876-923 11.0-11.6 ≥955 ≥12 303-318 38-40 ≤80
N42 1.30-1.33 13.0-13.3 876-926 11.0-11.6 ≥955 ≥12 318-334 40-42 ≤80
N45 1.33-1.37 13.3-13.7 876-926 11.0-11.6 ≥955 ≥12 342-358 43-45 ≤80
N48 1.36-1.42 13.6-14.2 876-926 11.0-11.6 ≥955 ≥12 358-382 45-48 ≤80
N50 1.41-1.45 14.1-14.5 828-907 10.4-11.4 ≥876 ≥11 382-398 48-50 ≤70
N52 1.44-1.48 14.4-14.8 828-907 10.4-11.4 ≥876 ≥11 394-414 49.5-52 ≤70
N35M 1.17-1.21 11.7-12.1 892-915 11.2-11.5 ≥1114 ≥14 263-279 33-35 ≤100
N38M 1.22-1.26 12.2-12.6 907-931 11.4-11.7 ≥1114 ≥14 287-303 36-38 ≤100
N40M 1.26-1.29 12.6-12.9 907-947 11.4-11.9 ≥1114 ≥14 303-318 38-40 ≤100
N42M 1.30-1.33 13.0-13.3 907-947 11.4-11.9 ≥1114 ≥14 318-334 40-42 ≤100
N45M 1.33-1.37 13.3-13.7 907-955 11.4-12.0 ≥1114 ≥14 334-358 42-45 ≤100
N48M 1.36-1.42 13.6-14.2 907-955 11.4-12.0 ≥1114 ≥14 358-382 45-48 ≤100
N33H 1.14-1.17 11.4-11.7 820-876 10.3-11.0 ≥1353 ≥17 247-263 31-33 ≤120
N35H 1.17-1.21 11.7-12.1 860-907 10.8-11.4 ≥1353 ≥17 263-279 33-35 ≤120
N38H 1.22-1.26 12.2-12.6 907-947 11.4-11.9 ≥1353 ≥17 287-303 36-38 ≤120
N40H 1.26-1.29 12.6-12.9 907-947 11.4-11.9 ≥1353 ≥17 303-318 38-40 ≤120
N42H 1.30-1.33 13.0-13.3 907-947 11.4-11.9 ≥1353 ≥17 318-334 40-42 ≤120
N44H 1.33-1.36 13.3-13.6 907-947 11.4-11.9 ≥1274 ≥16 334-350 42-44 ≤110
N30SH 1.08-1.12 10.8-11.2 804-844 10.1-10.6 ≥1592 ≥20 223-239 28-30 ≤150
N33SH 1.14-1.17 11.4-11.7 820-876 10.3-11.0 ≥1592 ≥20 247-263 31-33 ≤150
N35SH 1.17-1.21 11.7-12.1 860-907 10.8-11.4 ≥1592 ≥20 263-279 33-35 ≤150
N38SH 1.22-1.26 12.2-12.6 907-947 11.4-11.9 ≥1592 ≥20 287-303 36-38 ≤150
N40SH 1.26-1.29 12.6-12.9 907-947 11.4-11.9 ≥1592 ≥20 303-318 38-40 ≤150
N42SH 1.30-1.33 13.0-13.3 907-947 11.4-11.9 ≥1512 ≥19 318-334 40-42 ≤140
N28UH 1.04-1.08 10.4-10.8 780-812 9.8-10.2 ≥1990 ≥25 207-223 26-28 ≤180
N30UH 1.08-1.12 10.8-11.2 804-844 10.1-10.6 ≥1990 ≥25 223-239 28-30 ≤180
N33UH 1.14-1.17 11.4-11.7 820-876 10.3-11.0 ≥1990 ≥25 247-263 31-33 ≤180
N35UH 1.17-1.21 11.7-12.1 860-907 10.8-11.4 ≥1990 ≥25 263-279 33-35 ≤180
N38UH 1.22-1.26 12.2-12.6 860-907 10.8-11.4 ≥1990 ≥25 287-303 36-38 ≤180
N40UH 1.26-1.29 12.6-12.9 860-907 10.8-11.4 ≥1990 ≥25 289-303 38-40 ≤180
N28EH 1.04-1.08 10.4-10.8 780-812 9.8-10.2 ≥2388 ≥30 207-223 26-28 ≤200
N30EH 1.08-1.12 10.8-11.2 804-844 10.1-10.6 ≥2388 ≥30 223-239 28-30 ≤200
N33EH 1.14-1.17 11.4-11.7 820-876 10.3-11.0 ≥2388 ≥30 247-263 31-33 ≤200
N35EH 1.17-1.21 11.7-12.1 860-907 10.8-11.4 ≥2388 ≥30 263-279 33-35 ≤200
N38EH 1.22-1.26 12.2-12.6 860-907 10.8-11.4 ≥2388 ≥30 287-303 36-38 ≤200

Thermal characteristics

NdFeB material type Coefficient of thermal expansion Working temperature Curie temperature Thermal Conductivity
%/℃ °C(°F) °C(°F) Kcal/ MH-
Ñ -0.12 176°F(80℃)下 590°F(310℃) 7.7
NM -0.12 212°F(100℃) 644°F(340°C) 7.7
NH -0.11 248°F(120℃) 644°F(340°C) 7.7
NSH -0.1 302°F(150℃) 644°F(340°C) 7.7
NUH -0.1 356°F(180℃) 662°F(350℃) 7.7
NEH -0.1 392°F(200℃) 662°F(350℃) 7.7

The thermal properties listed above are usually the value grades or materials associated with each magnet.

Physical and mechanical properties

Density 7.4-7.5 g/cm3
Compressive strength 110 kg/mm2
Bending strength 25kg/mm2
Vickers hardness (Hv) 560-600
Tensile strength 7.5kg/mm2
Young’s modulus 1.7×104 kg/mm2
Recovery permeability 1.05μrec
Resistance ® 160μ-ohm-cm
Heat capacity 350-500 Joule/(kg.)
Coefficient of thermal expansion (0~100°C) 5.2×10 -6 /℃
Parallel magnetization direction
Coefficient of thermal expansion (0~100°C  -0.8×10 -6 /
Perpendicular magnetization direction

Electroplating characteristics

Electroplating type Overall thickness Salt spray test Pressure cooker test
NiCuNi 15-21 microns 24 times 48 times
Copper nickel sulfide + black nickel 15-21 microns 24 times 48 times
NiCuNi + Epoxy 20-28 microns 48 times 72 times
NiCuNi + gold 16-23 microns 36 times 72 times
NiCuNi + silver 16-23 microns 24 times 48 times
Zinc 7-15 microns 12 times 24 times

Each layer of nickel and copper is 5-7 microns thick. The gold and silver plating layer is 1-2 microns thick.
The test results are displayed, allowing comparison between plating options. Under your specific test conditions, your application performance may vary. The salt spray test was conducted with 5% NaCl solution at 35°C. The pressure cooking test (PCT) was carried out at 2 atmospheres, 120°C, and 100% RH.

Units of measurement

Unit CGS SI
Length (L) Centimeter (cm) Meter (m)
Flux (O) Maxwell Weber (WB)
Magnetic flux density (B) Gauss (G) Tesla (T)
Magnetizing force (H) Oster (OE) Ampere-turns/m (in/m)
Magnetomotive force (MMF or F) Gilbert (GB) Ampere (At)
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