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Neodymium Magnets

Stock sizes of Neodymium Magnets










 

Most powerful
easily corrupted
Hard and brittle

 

permanent magnets today in the world. (BH)max at different grades of Neodymium magnets is 27 to 52 MGOe. 

Neodymium magnets have extremely resistance to demagnetization with Hci, Intrisic coercive force, over 12,000 Oe. 
Because of very high (BH)max and Hci, Neodymium magnets could be used as a reversible medium for large amount of energy transformation in miniaturized application where a strong magnetic demagnetization field exists , such as computer hard drive.
Armstrong Magnetics stocks N35 and N40 Neodymium magnets in disk and rectangle shapes  for customers' immediate needs and accept special orders for  custom Neodymium magnets.

Neodymium magnets are most powerful of any kind of magnetic materials
Br of Neodymium magnets are much more than 11,000 Gauss. Therefore, Neodymium magnets have strong holding strength on metal surface and could be used as component for holding, separating, etc.
Neodymium magnets must be carefully handled to avoid personal injury and material damage due to its extremely magnetic strength and brittle property.

Neodymium magnets are sensitive to temperature change and even lose magnet properties at high temperature
Neodymium magnets lose -0.09 ~ -0.13% of Br/
°C  and can work stably under 80°C for low Hci Neodymium magnets and 150°C for high Hci Neodymium magnets.

Neodymium magnets are corrupted in humid environment 
Surface protection is strongly recommended, such as plating, varnishing and encapsulating.

Neodymium magnets are hard and brittle 
Neodymium magnets can be abrasively machined with coolant  served to absorb heating and dust. Without  coolant, rare earth magnets could crack and chip by the heat produced during  high speed cutting or grinding, and the sparks contain the easily oxidized grinding dust that  could cause fire!

Tolerance of Neodymium magnets
Unless otherwise specified, tolerance on dimension of magnetization is ±.005”. Other dimensions are ±1.5% or ±.010”, whichever is greater.

 

Neodymium magnets are dark gray alloy. They are composed of Neodymium, Iron and Boron.  Density of Neodymium magnets  is .27Lb/in3 (7.5g/cm3).
Neodymium magnets are manufactured in a metallurgy process through alloying, crushing, powdering, pressing w/magnetic orientation, sintering, then cutting, coating, inspecting and packing before shipment.

Neodymium magnets offer the highest (BH)max and high Hci
(BH)max, the Maximum Energy Product, of Neodymium magnets is highest of any kind of 

 

MAGNETIC PROPERTY OF NEODYMIUM MAGNET

Grade

Remanence
Br

Coercive Force
Hcb

Intrinsic Coercive force
Hci

Max Energy Product
(BH) max

Max Working Temp.

KG

T

KOe

KA/m

KOe

KA/m

MGOe

KJ/m

°F

N35

11.4-11.8

1.18-1.28

≥ 10.8

≥ 836

≥ 12

≥ 955

33-36

263-287

80

176

N38

11.8-12.3

1.18-1.28

≥ 10.8

≥ 860

≥ 12

≥ 955

36-39

287-310

80

176

N40

12.7-12.9

1.27-1.29

≥ 11.0

≥ 876

≥ 12

≥ 955

38-41

303-326

80

176

N42

12.9-13.3

1.29-1.33

≥ 10.5

≥ 836

≥ 12

≥ 955

40-43

318-342

80

176

N45

13.3-13.8

1.33-1.38

≥ 9.5

≥ 756

≥ 12

≥ 955

43-46

342-366

80

176

N48

13.8-14.2

1.38-1.42

≥ 10.5

≥ 835

≥ 12

≥ 955

46-49

366-390

80

176

N50

13.8-14.5

1.38-1.45

≥ 10.5

≥ 835

≥ 11

≥ 955

47-51

374-406

80

176

N52

14.3-14.8

1.43-1.48

≥ 10.8

≥ 860

≥ 11

≥ 876

50-53

398-422

80

176

33M

11.4-11.8

1.14-1.18

≥ 10.3

≥ 820

≥ 14

≥ 1114

31-33

247-263

100

212

35M

11.8-12.3

1.18-1.23

≥ 10.8

≥ 860

≥ 14

≥ 1114

33-36

263-287

100

212

38M

12.3-12.7

1.23-1.27

≥ 11.0

≥ 876

≥ 14

≥ 1114

38-41

303-326

100

212

40M

12.7-12.9

1.27-1.29

≥ 11.4

≥ 907

≥ 14

≥ 1114

38-41

303-326

100

212

42M

12.8-13.2

1.28-1.32

≥ 11.6

≥ 923

≥ 14

≥1114

40-43

318-342

100

212

45M

13.2-13.8

1.32-1.38

≥ 11.8

≥ 939

≥ 14

≥ 1114

43-46

342-366

100

212

48M

13.6-14.0

1.36-1.40

≥ 11.8

≥ 939

≥ 14

≥ 1114

46-49

366-390

100

212

50M

14.0-14.5

1.40-1.45

≥ 13.0

≥ 1033

14

≥ 1114

48-51

382-406

100

212

30H

10.8-11.4

1.08-1.14

≥ 10.2

≥ 812

≥ 17

≥ 1353

28-31

223-247

120

212

33H

11.4-11.8

1.14-1.18

≥ 10.6

≥ 844

≥ 17

≥ 1353

31-33

247-263

120

212

35H

11.8-12.3

1.18-1.28

≥ 11.0

≥ 876

≥ 17

≥ 1353

33-36

263-287

120

212

38H

12.3-12.7

1.23-1.27

≥ 11.2

≥ 890

≥ 17

≥ 1353

36-39

287-310

120

212

40H

12.7-12.9

1.27-1.29

≥ 11.5

≥ 915

≥ 17

≥ 1353

38-41

303-326

120

212

42H

12.8-13.2

1.28-1.32

≥ 12.0

≥ 955

≥ 17

≥ 1353

40-43

318-342

120

212

45H

13.2-13.5

1.32-1.38

≥ 12.0

≥ 955

≥ 17

≥ 1353

42-46

335-366

120

212

46H

13.3-13.8

1.33-1.38

≥ 12.2

≥ 972

≥ 16

≥ 1274

44-47

350-374

120

212

48H

13.6-14.3

1.36-1.43

≥ 12.5

≥ 995

≥ 16

≥ 1274

46-49

366-390

120

212

30SH

10.8-11.4

1.081.14

≥ 10.0

≥ 796

≥ 20

≥ 1672

28-31

223-247

150

302

33SH

11.4-11.8

1.14-1.18

≥ 10.5

≥ 836

≥ 20

≥ 1672

31-34

247-276

150

302

35SH

11.8-12.3

1.18-1.23

≥ 11.0

≥ 876

≥ 20

≥ 1672

33-36

263-287

150

302

38SH

12.3-12.7

1.23-1.27

≥ 11.4

≥ 907

≥ 20

≥ 1972

36-39

287-310

150

302

40SH

12.5-12.8

1.25-1.28

≥ 11.8

≥ 939

≥ 20

≥ 1972

38-41

302-326

150

302

42SH

12.8-13.2

1.28-1.32

≥ 11.8

≥ 939

≥ 20

≥ 1672

40-43

320-343

150

302

45SH

13.2-13.8

1.32-1.38

≥ 12.6

≥ 1003

≥ 20

≥ 1592

43-46

342-366

150

302

30UH

10.8-11.4

1.08-1.14

≥ 10.2

≥ 812

≥ 25

≥ 1990

28-31

223-247

180

356

33UH

11.3-11.7

1.13-1.17

≥ 10.7

≥ 852

≥ 25

≥ 1990

31-33

247-263

180

356

35UH

11.7-12.1

1.17-1.21

≥ 10.7

≥ 852

≥ 25

≥ 1990

33-36

263-287

180

356

38UH

12.1-12.5

1.21-1.25

≥ 11.4

≥ 907

≥ 25

≥ 1990

36-39

287-310

180

356

40UH

12.5-12.8

1.25-1.28

≥ 11.4

≥ 907

≥ 25

≥ 1990

38-41

302-326

180

356

28EH

10.5-10.8

1.05-1.08

≥ 9.5

≥ 756

≥ 30

≥ 2388

26-29

207-231

200

392

30EH

10.8-11.4

1.08-1.14

≥ 9.5

≥ 756

≥ 30

≥ 2388

28-31

223-241

200

292

33EH

11.3-11.7

1.13-1.17

≥ 10.2

≥ 812

≥ 30

≥ 2388

31-33

247-263

200

392

35EH

11.7-12.1

1.17-1.21

≥ 10.2

≥ 812

≥ 30

≥ 2388

33-36

263-287

200

392

38EH

12.1-12.5

1.21-1.25

≥ 11.4

≥ 907

≥ 30

≥ 2388

36-39

287-310

200

392

30AH

10.8-11.3

1.08-1.13

≥ 10.2

≥ 812

≥ 35

≥ 2785

28-32

223-255

220

428

33AH

11.2-11.7

1.12-1.17

≥ 10.2

≥ 812

≥ 35

≥ 2785

31-34

247-271

220

428

Note:
1. The data above are tested at 20
ºC.
2. The maximum working temperature for a given magnet could be less due to the ratio of length and diameter of the magnet, the structure of its assembly with steel parts and environmental factors.
3. A strong external adverse magnetic field, shock, vibration and elctro-magnetic field can result in partial demagnetization.