Grades Of Neodymium Magnets

Confused by what all the different letters and number in a grade’s name mean? Here, we will explain the difference in grades of neodymium magnets.

It all starts with the letter ‘N’, all the names of neodymium magnets begin with ‘N’ for neodymium. The number that follows is a little more technical as this represents the maximum energy product of the magnet in ‘Mega-Gauss Oersteds’ (MGOe). This is the primary indicator of a magnets ‘strength’. Simply, the higher the maximum energy product value, the greater the magnetic field the magnet will generate in a particular application.

The grades generally available to buy, range from N30 to N52 as lower grades are generally no longer manufactured.

At first4magnets.com, we do not compromise on quality and the majority of our magnets are grade N42 or above, making them 20% more magnetic than many cheaper N35 grade neodymium magnets. N42 grade offers a high performance at an economical price. Grades above N42 tend to be more expensive and the rise in price can be disproportionate to the increase in performance. An example is N52 grade which is 20% more powerful than N42 grade and yet can be twice the price.

Higher grades should be used where the highest performance is needed and the available space for the magnet is limited and cannot be increased. Otherwise it would be more beneficial to use two N42 magnets instead of one N52 magnet.

At times, you may also see one or two letters tagged onto the end of a grade. These letters determine the temperature rating and represent the maximum operating temperature the magnet can withstand before it begins to lose its magnetism permanently. These ratings should always be treated as a guide value as other factors such as size and shape also have an impact on the performance of a magnet at high temperatures. For more information, go to the ‘How does temperature affect neodymium magnets’ page.

 

Neodymium magnet grades and their magnetic properties.

 

Remanence

BR

mT

(kGs)

 

 

Coercive Force

HcB

kA/m

(kOe)

 

 

Intrinsic Coercive Force

Hcj

kA/m

(kOe)

 

 

Max. energy product

(BH)max

 

kJ/m3

 

 

Max. Operating Temperature

 

 

TW

 

N35

1170-1220

(11.7-12.2)

?868

(?10.9)

?955

(?12)

263-287

(33-36)

80°C

N38

1220-1250

(12.2-12.5)

?899

(?11.3)

?955

(?12)

287-310

(36-39)

80°C

N40

1250-1280

(12.5-12.8)

?907

(?11.4)

?955

(?12)

302-326

(38-41)

80°C

N42

1280-1320

(12.8-13.2)

?915

(?11.5)

?955

(?12)

318-342

(40-43)

80°C

N45

1320-1380

(13.2-13.8)

?923

(?11.6)

?955

(?12)

342-366

(43-46)

80°C

N48

1380-1420

(13.8-14.2)

?923

(?11.6)

?955

(?12)

366-390

(46-49)

80°C

N50

1400-1450

(14.0-14.5)

?796

(?10.0)

?876

(?11)

382-406

(48-51)

80°C

N52

1430-1480

(14.3-14.8)

?796

(?10.0)

?876

(?11)

398-422

(50-53)

80°C

33M

1130-1170

(11.3-11.7)

?836

(?10.5)

?1114

(?14)

247-263

(31-33)

100°C

35M

1170-1220

(11.7-12.2)

?868

(?10.9)

?1114

(?14)

263-287

(33-36)

100°C

38M

1220-1250

(12.2-12.5)

?899

(?11.3)

?1114

(?14)

287-310

(36-39)

100°C

40M

1250-1280

(12.5-12.8)

?923

(?11.6)

?1114

(?14)

302-326

(38-41)

100°C

42M

1280-1320

(12.8-13.2)

?955

(?12.0)

?1114

(?14)

318-342

(40-43)

100°C

45M

1320-1380

(13.2-13.8)

?995

(?12.5)

?1114

(?14)

342-366

(43-46)

100°C

48M

1360-1430

(13.6-14.3)

?1027

(?12.9)

?1114

(?14)

366-406

(48-49)

100°C

50M

1400-1450

(14.0-14.5)

?1033

(?13.0)

?1114

(?14)

382-406

(48-51)

100°C

35H

1170-1220

(11.7-12.2)

?868

(?10.9)

?1353

(?17)

263-287

(33-36)

120°C

38H

1220-1250

(12.2-12.5)

?899

(?11.3)

?1353

(?17)

287-310

(36-39)

120°C

40H

1250-1280

(12.5-12.8)

?923

(?11.6)

?1353

(?17)

302-326

(38-341)

120°C

42H

1280-1320

(12.8-13.2)

?955

(?12.0)

?1353

(?17)

318-342

(40-43)

120°C

45H

1320-1360

(13.2-13.6)

?963

(?12.1)

?1353

(?17)

342-366

(43-46)

120°C

48H

1370-1430

(13.7-14.3)

?995

(?12.5)

?1353

(?17)

366-390

(46-49)

120°C

35SH

1170-1220

(11.7-12.2)

?876

(?11.0)

?1592

(?20)

263-287

(33-36)

150°C

38SH

1220-1250

(12.2-12.5)

?907

(?11.4)

?1592

(?20)

287-310

(36-39)

150°C

40SH

1240-1280

(12.5-12.8)

?939

(?11.8)

?1592

(?20)

302-326

(38-41)

150°C

45SH

1320-1380

(13.2-13.8)

?1003

(?12.6)

?1592

(?20)

342-366

(43-46)

150°C

28UH

1020-1080

(10.2-10.8)

?764

(?9.6)

?1990

(?25)

207-231

(26-29)

180°C

30UH

1080-1130

(10.8-11.3)

?812

(?10.2)

?1990

(?25)

223-247

(28-31)

180°C

33UH

1130-1170

(11.3-11.7)

?852

(?10.7)

?1990

(?25)

247-271

(31-34)

180°C

35UH

1180-1220

(11.8-12.2)

?860

(?10.8)

?1990

(?25)

263-287

(33-36)

180°C

38UH

1220-1250

(12.2-12.5)

?876

(?11.0)

?990

(?25)

287-310

(36-39)

180°C

40UH

1240-1280

(12.5-12.8)

?899

(?11.3)

?1990

(?25)

302-326

(38-41)

180°C

28EH

1040-1090

(10.4-10.9)

?780

(?9.8)

?2388

(?30)

207-231

(26-29)

200°C

30EH

1080-1130

(10.8-11.3)

?812

(?10.2)

?2388

(?30)

223-247

(28-31)

200°C

33EH

1130-1170

(11.3-11.7)

?876

(?10.5)

?2388

(?30)

247-271

(31-34)

200°C

35EH

1170-1220

(11.7-12.2)

?876

(?11.0)

?2388

(?30)

263-287

(33-36)

200°C

38EH

1220-1250

(12.2-12.5)

?899

(?11.3)

?2388

(?30)

287-310

(36-39)

200°C

28AH

1040-1090

(10.4-10.9)

?787

(?9.9)

?2624

(?33)

207-231

(26-29)

230°C

30AH

1080-1130

(10.8-11.3)

?819

(?10.3)

?2624

(?33)

223-247

(28-31)

230°C

33AH

1130-1170

(11.3-11.7)

?843

(?10.6)

?2624

(33)

247-371

(31-34)

230°C

 

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