Magnet Standards

Magnetic properties of Neodymium magnets

Grade Residual Induction Coercive Force Intrinsic Coercive Force Maximum Energy Product Maximum Working Temperature
Br Hcb Hcj (BH)max Tw
mT kA/m kA/m kJ/m3
[kGs] [kOe] [kOe] [MGOe]
N35 1170-1220 ≥868 ≥955 263-287 80°
[11.7-12.2] [≥10.9] [≥12] [33-36]
N38 1220-1250 ≥899 ≥955 287-310 80°
[12.2-12.5] [≥11.3] [≥12] [36-39]
N40 1250-1280 ≥907 ≥955 302-326 80°
[12.5-12.8] [≥11.4] [≥12] [38-41]
N42 1280-1320 ≥915 ≥955 318-342 80°
[12.8-13.2] [≥11.5] [≥12] [40-43]
N45 1320-1380 ≥923 ≥955 342-366 80°
[13.2-13.8] [≥11.6] [≥12] [43-46]
N48 1380-1420 ≥923 ≥876 366-390 80°
[13.8-14.2] [≥11.6] [≥12] [46-49]
N50 1400-1450 ≥796 ≥876 382-406 80°
[14.0-14.5] [≥10.0] [≥11] [48-51]
N52 1430-1480 ≥796 ≥876 398-422 80°
[14.3-14.8] [≥10.0] [≥11] [50-53]
33M 1130-1170 ≥836 ≥1114 247-263 100°
[11.3-11.7] [≥10.5] [≥11] [31-33]
35M 1170-1220 ≥868 ≥1114 263-287 100°
[11.7-12.2] [≥10.9] [≥11] [33-36]
38M 1220-1250 ≥899 ≥1114 287-310 100°
[12.2-12.5] [≥11.3] [≥11] [36-39]
40M 1250-1280 ≥923 ≥1114 302-326 100°
[12.5-12.8] [≥11.6] [≥11] [38-41]
42M 1280-1320 ≥955 ≥1114 318-342 100°
[12.8-13.2] [≥12.0] [≥11] [40-43]
45M 1320-1380 ≥955 ≥1114 342-366 100°
[13.2-13.8] [≥12.5] [≥11] [43-46]
48M 1360-1430 ≥1027 ≥1114 366-390 100°
[13.6-14.3] [≥12.9] [≥11] [46-49]
50M 1400-1450 ≥1033 ≥1114 382-406 100°
[14.0-14.5] [≥13.0] [≥11] [48-51]
35H 1170-1220 ≥868 ≥1353 263-287 120°
[11.7-12.2] [≥10.9] [≥17] [33-36]
38H 1220-1250 ≥899 ≥1353 287-310 120°
[12.2-12.5] [≥11.3] [≥17] [36-39]
40H 1250-1280 ≥923 ≥1353 302-326 120°
[12.5-12.8] [≥11.6] [≥17] [38-41]
42H 1280-1320 ≥955 ≥1353 318-342 120°
[12.8-13.2] [≥12.0] [≥17] [40-43]
45H 1300-1360 ≥963 ≥1353 326-358 120°
[13-13.6] [≥12.1] [≥17] [43-46]
48H 1370-1430 ≥955 ≥1353 366-390 120°
[13.7-14.3] [≥12.5] [≥17] [46-49]
35SH 1170-1220 ≥876 ≥1592 263-287 150°
[11.7-12.2] [≥11.0] [≥20] [33-36]
38SH 1220-1250 ≥907 ≥1592 287-310 150°
[12.2-12.5] [≥11.4] [≥20] [36-39]
40SH 1240-1280 ≥939 ≥1592 302-326 150°
[12.5-12.8] [≥11.8] [≥20] [38-41]
42SH 1280-1320 ≥987 ≥1592 318-342 150°
[12.8-13.2] [≥12.4] [≥20] [40-43]
45SH 1320-1380 ≥1003 ≥1592 342-366 150°
[13.2-13.8] [≥12.6] [≥20] [43-46]
28UH 1020-1080 ≥764 ≥1990 207-231 180°
[10.2-10.8] [≥9.6] [≥25] [26-29]
30UH 1080-1130 ≥812 ≥1990 223-247 180°
[10.8-11.3] [≥10.2] [≥25] [28-31]
33UH 1130-1170 ≥852 ≥1990 247-271 180°
[11.3-11.7] [≥10.7] [≥25] [31-34]
35UH 1180-1220 ≥860 ≥1990 263-287 180°
[11.8-12.2] [≥10.8] [≥25] [33-36]
38UH 1220-1250 ≥876 ≥1990 287-310 180°
[12.2-12.5] [≥11.0] [≥25] [36-39]
40UH 1240-1280 ≥899 ≥1990 302-326 180°
[12.5-12.8] [≥11.3] [≥25] [38-41]
28EH 1040-1090 ≥780 ≥2388 207-231 200°
[10.4-10.9] [≥9.8] [≥30] [26-29]
30EH 1080-1130 ≥812 ≥2388 223-247 200°
[10.8-11.3] [≥10.2] [≥30] [28-31]
33EH 1130-1170 ≥876 ≥2388 247-271 200°
[11.3-11.7] [≥10.5] [≥30] [31-34]
35EH 1170-1220 ≥876 ≥2388 263-287 200°
[11.7-12.2] [≥11.0] [≥30] [33-36]
38EH 1220-1250 ≥899 ≥2388 287-310 200°
[12.2-12.5] [≥11.3] [≥30] [36-39]
28AH 1040-1090 ≥787 ≥2624 207-231 220°
[10.4-10.9] [≥9.9] [≥30] [26-29]
30AH 1080-1150 ≥819 ≥2624 223-247 220°
[10.8-11.3] [≥10.3] [≥30] [28-31]
33AH 1130-1170 ≥843 ≥2624 247-271 220°
[11.3-11.7] [≥10.6] [≥33] [31-34]

Physical properties of Neodymium magnets

Parameters Units Indicators
Density g/cm3 ≥7.3
Home temperature 310-340
BrReversible temperature coefficient ℃/% -0.100~-0.130
HcjReversible temperature coefficient ℃/% ﹣0.40~﹣0.70
Compressive strength N/mm2 1050
Bending strength N/mm2 250
Tensile strength N/mm2 80
Webster Hardness 600
Coefficient of thermal expansion(20 to 200℃) 10-6/k ∥5⊥-1.5
Specific heat J/(Kg.K) 460
Thermal conductivity W/(m.K) 9
Resistivity μΩ.cm 150

Surface coatings of Neodymium magnets

Surface coating Coating method Coating thickness (μm) Coating color Coating features
Nickel Plating ≥ 5 Yellow Corrosion resistance strong, with outstanding resistance to high temperature and humidity capabilities.
Zinc Plating ≥ 5 Silvery white Has strong corrosion resistance, anti-salt spray test ability.
Gold Plating ≥ 5 Gold Has outstanding resistance to high temperature capability, corrosion resistance, good resistance to color change ability.
Ni-Cu-Ni Plating 15-30 Silver strong corrosion resistance.
Epoxy Electrophoresis 15-20 Black / Grey Strong corrosion resistance, outstanding resistance to salt spray, strong resistance to high temperature, high humidity capacity.

Magnetic Characteristics of Sintered SmCo:

Materia
Grade
Max Engery product
Remanence
Coercive Force
Intrinsic Coercive Force
Temp Coeff
Density
Curie Temp
Working Temp
(BH)max
Br
Hcb
Hcj
αBr
D
Tc
Tw
KJ/m3(MGOe)
mT(KGs)
KA/m(KOe)
KA/m(KOe)
%/ ℃
g/cm3
Sm1Co5
18A
143(18)
850(8.5)
597(7.5)
1273(16.0)
-0.04
8.2
740
250
18B
143(18)
850(8.5)
660(8.3)
1600(20.0)
19
150(19)
900(9.0)
690(8.7)
900(11.3)
20A
159(20)
900(9.0)
613(7.7)
1989(25.0)
20B
160(20)
900(9.0)
660(8.3)
900(11.3)
20C
160(20)
900(9.0)
680(8.5)
1270(16.0)
21
165(21)
920(9.2)
710(8.9)
1600(20.0)
22A
175(22)
940(9.4)
700(8.8)
900(11.3)
22B
180(22)
950(9.5)
720(9.0)
1270(16.0)
Sm2Co17
24C
191(24)
1000(10.0)
356(4.5)
413(5.2)
-0.03
8.3
820
350
24D
190(24)
1000(10.0)
480(6.0)
560(7.0)
24E
190(24)
1010(10.1)
675(8.5)
1300(16.0)
24F
190(24)
980(9.8)
710(8.9)
900(11.3)
24G
190(24)
1000(10.0)
740(9.3)
2070(26.0)
24H
195(24)
1020(10.2)
748(9.4)
1433(18.0)
25
205(26)
1040(10.4)
700(8.8)
1300(16.0)
26A
205(26)
1020(10.2)
420(5.2)
440(5.5)
26B
207(26)
1030(10.3)
716(9.0)
1432(18.0)
26C
210(26)
1020(10.2)
740(9.3)
900(11.3)
26D
205(26)
1050(10.5)
756(9.5)
1433(18.0)
26E
210(26)
1070(10.7)
780(9.8)
2070(26.0)
28A
220(28)
1080(10.8)
420(5.2)
440(5.5)
28B
223(28)
1100(11.0)
438(5.5)
454(5.7)
28C
220(28)
1090(10.9)
520(6.5)
560(7.0)
28D
224(28)
1110(11.1)
640(8.0)
1040(13.0)
28E
225(28)
1060(10.6)
760(9.6)
900(11.3)
28F
220(28)
1080(10.8)
780(9.8)
955(18.0)
28G
220(28)
1100(11.0)
820(10.3)
2070(26.0)
30A
240(30)
1100(11.0)
780(9.8)
900(11.3)