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Grades Of Neodymium Magnets

NEODYMIUM MAGNET GRADES

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.

Table: Neodymium magnet grades and their magnetic properties.

 
Remanence
Br
Coercive Force
Hcb
Intrinsic Coercive Force
Hcj
Max. energy product
( BH )max
mT kA/m kA/m kJ/m3
(kGs) (kOe) (kOe) (MGOe)
Max. Operating Temperature
TW
N35
1170-1220 ≥ 868 ≥ 955 263-287
(11.7-12.2) ( ≥ 10.9) ( ≥ 12) (33-36)
80 ℃
N38
1220-1250 ≥ 899 ≥ 955 287-310
(12.2-12.5) ( ≥ 11.3) ( ≥ 12) (36-39)
80 ℃
N40
1250-1280 ≥ 907 ≥ 955 302-326
(12.5-12.8) ( ≥ 11.4) ( ≥ 12) (38-41)
80 ℃
N42
1280-1320 ≥ 915 ≥ 955 318-342
(12.8-13.2) ( ≥ 11.5) ( ≥ 12) (40-43)
80 ℃
N45
1320-1380 ≥ 923 ≥ 955 342-366
(13.2-13.8) ( ≥ 11.6) ( ≥ 12) (43-46)
80 ℃
N48
1380-1420 ≥ 923 ≥ 955 366-390
(13.8-14.2) ( ≥ 11.6) ( ≥ 12) (46-49)
80 ℃
N50
1400-1450 ≥ 796 ≥ 876 382-406
(14.0-14.5) ( ≥ 10.0) ( ≥ 11) (48-51)
80 ℃
N52
1430-1480 ≥ 796 ≥ 876 398-422
(14.3-14.8) ( ≥ 10.0) ( ≥ 11) (50-53)
80 ℃
33M
1130-1170 ≥ 836 ≥ 1114 247-263
(11.3-11.7) ( ≥ 10.5) ( ≥ 14) (31-33)
100 ℃
35M
1170-1220 ≥ 868 ≥ 1114 263-287
(11.7-12.2) ( ≥ 10.9) ( ≥ 14) (33-36)
100 ℃
38M
1220-1250 ≥ 899 ≥ 1114 287-310
(12.2-12.5) ( ≥ 11.3) ( ≥ 14) (36-39)
100 ℃
40M
1250-1280 ≥ 923 ≥ 1114 302-326
(12.5-12.8) ( ≥ 11.6) ( ≥ 14) (38-41)
100 ℃
42M
1280-1320 ≥ 955 ≥ 1114 318-342
(12.8-13.2) ( ≥ 12.0) ( ≥ 14) (40-43)
100 ℃
45M
1320-1380 ≥ 995 ≥ 1114 342-366
(13.2-13.8) ( ≥ 12.5) ( ≥ 14) (43-46)
100 ℃
48M
1360-1430 ≥ 1027 ≥ 1114 366-390
(13.6-14.3) ( ≥ 12.9) ( ≥ 14) (46-49)
100 ℃
50M
1400-1450 ≥ 1033 ≥ 1114 382-406
(14.0-14.5) ( ≥ 13.0) ( ≥ 14) (48-51)
100 ℃
35H
1170-1220 ≥ 868 ≥ 1353 263-287
(11.7-12.2) ( ≥ 10.9) ( ≥ 17) (33-36)
120 ℃
38H
1220-1250 ≥ 899 ≥ 1353 287-310
(12.2-12.5) ( ≥ 11.3) ( ≥ 17) (36-39)
120 ℃
40H
1250-1280 ≥ 923 ≥ 1353 302-326
(12.5-12.8) ( ≥ 11.6) ( ≥ 17) (38-41)
120 ℃
42H
1280-1320 ≥ 955 ≥ 1353 318-342
(12.8-13.2) ( ≥ 12.0) ( ≥ 17) (40-43)
120 ℃
45H
1320-1360 ≥ 963 ≥ 1353 342-366
(13.2-13.6) ( ≥ 12.1) ( ≥ 17) (43-46)
120 ℃
48H
1370-1430 ≥ 995 ≥ 1353 366-390
(13.7-14.3) ( ≥ 12.5) ( ≥ 17) (46-49)
120 ℃
35SH
1170-1220 ≥ 876 ≥ 1592 263-287
(11.7-12.2) ( ≥ 11.0) ( ≥ 20) (33-36)
150 ℃
38SH
1220-1250 ≥ 907 ≥ 1592 287-310
(12.2-12.5) ( ≥ 11.4) ( ≥ 20) (36-39)
150 ℃
40SH
1240-1280 ≥ 939 ≥ 1592 302-326
(12.5-12.8) ( ≥ 11.8) ( ≥ 20) (38-41)
150 ℃
45SH
1320-1380 ≥ 1003 ≥ 1592 342-366
(13.2-13.8) ( ≥ 12.6) ( ≥ 20) (43-46)
150 ℃
28UH
1020-1080 ≥ 764 ≥ 1990 207-231
(10.2-10.8) ( ≥ 9.6) ( ≥ 25) (26-29)
180 ℃
30UH
1080-1130 ≥ 812 ≥ 1990 223-247
(10.8-11.3) ( ≥ 10.2) ( ≥ 25) (28-31)
180 ℃
33UH
1130-1170 ≥ 852 ≥ 1990 247-271
(11.3-11.7) ( ≥ 10.7) ( ≥ 25) (31-34)
180 ℃
35UH
1180-1220 ≥ 860 ≥ 1990 263-287
(11.8-12.2) ( ≥ 10.8) ( ≥ 25) (33-36)
180 ℃
38UH
1220-1250 ≥ 876 ≥ 1990 287-310
(12.2-12.5) ( ≥ 11.0) ( ≥ 25) (36-39)
180 ℃
40UH
1240-1280 ≥ 899 ≥ 1990 302-326
(12.5-12.8) ( ≥ 11.3) ( ≥ 25) (38-41)
180 ℃
28EH
1040-1090 ≥ 780 ≥ 2388 207-231
(10.4-10.9) ( ≥ 9.8) ( ≥ 30) (26-29)
200 ℃
30EH
1080-1130 ≥ 812 ≥ 2388 223-247
(10.8-11.3) ( ≥ 10.2) ( ≥ 30) (28-31)
200 ℃
33EH
1130-1170 ≥ 876 ≥ 2388 247-271
(11.3-11.7) ( ≥ 10.5) ( ≥ 30) (31-34)
200 ℃
35EH
1170-1220 ≥ 876 ≥ 2388 263-287
(11.7-12.2) ( ≥ 11.0) ( ≥ 30) (33-36)
200 ℃
38EH
1220-1250 ≥ 899 ≥ 2388 287-310
(12.2-12.5) ( ≥ 11.3) ( ≥ 30) (36-39)
200 ℃
28AH
1040-1090 ≥ 787 ≥ 2624 207-231
(10.4-10.9) ( ≥ 9.9) ( ≥ 33) (26-29)
230 ℃
30AH
1080-1130 ≥ 819 ≥ 2624 223-247
(10.8-11.3) ( ≥ 10.3) ( ≥ 33) (28-31)
230 ℃
33AH
1130-1170 ≥ 843 ≥ 2624 247-271
(11.3-11.7) ( ≥ 10.6) ( ≥ 33) (31-34)
230 ℃

 

Further Information Regarding Neodymium Magnets


How to buy Neodymium Magnets