Properties of Neodymium Iron Boron (NdFeB) Magnets

Grade

 Br
 mT(KGs)

bHc
 KA/m (KOe)

iHc 
KA/m(KOe)

BHmax
KJ/m3(MGOe)

Density 
g/cm3

Br.Temp. Coefficient 
%/℃

Curie 
Temp. 
℃

Maximum
Operating Temp. 
℃

“ N “ 
=
NormalTemperature Range

N35

1170-1210

≥868

≥955

263-287

7.4-7.6

-0.12

310

≤80

(11.7-12.1)

(≥10.9)

(≥12)

(33-36)

N38

1210-1250

≥899

≥955

287-310

7.4-7.6

-0.12

310

≤80

(12.1-12.5)

(≥11.3)

(≥12)

(36-37)

N40

1250-1280

≥923

≥955

302-326

7.4-7.6

-0.12

310

≤80

(12.5-12.8)

(≥11.6)

(≥12)

(38-41)

N42

1280-1320

≥923

≥955

318-342

7.4-7.6

-0.12

310

≤80

(12.8-13.2)

(≥11.6)

(≥12)

(40-43)

N45

1320-1380

≥876

≥955

342-366

7.4-7.6

-0.12

310

≤80

(13.2-13.8)

(≥11.0)

(≥12)

(43-46)

N48

1370-1420

≥836

≥876

366-390

7.4-7.6

-0.12

310

≤80

(13.7-14.2)

(≥10.5)

(≥11)

(46-49)  

N50

1400-1450

≥836

≥876

366-390

7.4-7.6

-0.12

310

≤80

(14.0-14.5)

(≥10.5)

(≥11)

(47-51)

“ M “ 
=
Medium Temperature Range

35M

1170-1210

≥868

≥1114

263-287

7.4-7.6

-0.12

320

≤100

(11.7-12.1)

(≥10.9)

(≥14)

(33-36)

38M

1210-1250

≥899

≥1114

287-310

7.4-7.6

-0.12

320

≤100

(12.1-12.5)

(≥11.3)

(≥14)

(36-37)

40M

1250-1280

≥923

≥1114

302-326

7.4-7.6

-0.12

320

≤100

(12.5-12.8)

(≥11.6)

(≥14)

(38-42)

42M

1280-1320

≥955

≥1114

318-342

7.4-7.6

-0.12

320

≤100

(12.8-13.2)

(≥12.0)

(≥14)

(40-44)

45M

1320-1380

≥994

≥1114

334-366

7.4-7.6

-0.12

320

≤100

(13.2-13.8)

(≥12.5)

(≥14)

(42-46)

48M

1370-1420

≥1018

≥1114

358-390

7.4-7.6

-0.12

320

≤100

(13.7-14.2)

(≥12.8)

(≥14)

(45-49)

50M

1400-1450

≥1042

≥1114

374-406

7.4-7.6

-0.12

320

(14.0-14.5)

(≥13.1)

(≥14)

(47-51)