Rare earth magnets can be classified into a samarium-cobalt magnet and a neodymium magnet. A characteristic of a samarium-cobalt magnet is strong magnetic force. Its merit is that it is resistant to rust and high temperature, but it tends to be easily broken. It is popular as the most suitable material for a small and lightweight magnet, like neodymium. A neodymium magnet can produce the strongest magnetic field in the world among those sold in the current market. The shape of a neodymium magnet can be round, square or ring according to what it is used for. Although it is mechanically strong, its surface is processed since it is easily rusted and therefore it must be used below 80°C.
Round Type
OD X H
Surface magnetic
flux density
magnetic
absorption
kG
mT
kgf
1) 1.2Ø X 2
1.3
130
0.04
1.5 ØX 1.5
2.8
280
0.05
2 ØX 2
2.7
270
0.07
2Ø X 3
3.2
320
0.08
3 Ø X 1.5
3.1
310
0.17
3 Ø X 1.8
3.2
320
0.25
3 Ø X 2.5
3.3
330
0.3
3 Ø X 3
3.4
340
0.35
3 Ø X 4
3.5
350
0.38
4 Ø X 1.5
2.7
270
0.25
4 Ø X 2
3.0
300
0.3
4 Ø X 3
3.5
350
0.4
4 Ø X 4
3.9
390
0.5
4 Ø X 5
4.2
420
0.55
5 Ø X 1
1.5
150
0.2
2) 5 Ø X 1.5
2.0
200
0.3
2) 5 Ø X 2
2.8
280
0.35
5 Ø X 3
3.5
350
0.44
5 Ø X 4
3.8
380
0.56
5 Ø X 5
4.0
400
0.65
5 .5Ø X 1.7
2.1
210
0.3
6 Ø X 2
2.2
220
0.4
6 Ø X 5
3.5
350
0.75
7 Ø X 2
3.0
300
0.7
7 Ø X 3
3.5
350
0.77
8 Ø X 2
2.2
220
0.65
8 Ø X 3
3.5
350
1.1
8 Ø X 4
3.6
360
1.25
8 Ø X 5
4.0
400
1.4
8 Ø X 8
4.2
420
1.8
9 Ø X 3
3.2
320
1.2
9.4Ø X 0.8
1.5
150
0.4
10 Ø X 2
3.5
350
1.35
O X H
Surface magnetic
flux density
magnetic
absorption
kG
mT
kgf
10 Ø X 3
3.5
350
1.45
10 Ø X 4
3.5
350
1.6
10 Ø X 5
3.5
350
2.2
10 Ø X 10
4.8
480
3.65
12 Ø X 1.3
2.0
200
1.45
12.5 Ø X 1.5
2.0
200
1.8
12.5 Ø X 2
2.0
200
1.9
13 Ø X 10
4.8
480
6.1
14 Ø X 10
4.5
450
6.4
15 Ø X 1.5
1.8
180
1.1
15 Ø X 1.7
2.0
200
1.3
15 Ø X 3
3.2
320
3.7
15 Ø X 4
3.3
330
4
15 Ø X 5
3.3
330
4.5
15 Ø X 10
4.2
420
6.8
16 Ø X 10
4.2
420
7.2
17.9 Ø X 2.5
2.7
270
2.5
19 Ø X 10
4.0
400
9.8
20 Ø X 5
2.8
280
6.3
21 Ø X 4.6
3.2
320
7.0
22 Ø X 10
4.5
450
15.3
23.5 Ø X 3.4
2.0
200
4
23.5 Ø X 4.5
2.2
220
4.8
23.5 Ø X 5
2.4
240
5.6
25 Ø X 3.4
1.8
180
4.2
25 Ø X 5
2.5
250
7.5
25 Ø X 6
3.0
300
9
25 Ø X 9.8
3.5
350
20.0
30 Ø X 15
5.0
500
22.0
32 Ø X 10.5
4.0
400
26.0
40 Ø X 10
3.8
380
35.0
100 Ø X 15
3.7
370
75.0
1) Gold plated, 2) Gold or Ni plated
•Surface magnetic flux density and the magnetic absorption are values for reference.
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Ring Type
OD X ID X H
Surface magnetic
flux density
magnetic
absorption
kG
mT
kgf
6Ø X 3Ø X 4
3.3
330
0.4
6.6Ø X 2Ø X 1.5
2.0
200
0.28
8Ø X 2Ø X 2.5
3.0
300
0.9
8Ø X 4Ø X 5
3.7
370
1.2
10Ø X 5Ø X 5
3.6
360
1.8
10Ø X 6Ø X 1
1.7
170
0.7
10Ø X 6Ø X 10
3.3
330
2.5
10.5Ø X 7.6Ø X 1
1.6
160
0.7
11Ø X 4Ø X 10
3.2
320
3.2
12Ø X 7Ø X 6
3.6
360
2.2
13.5Ø X 5ØX 2
2.2
220
1.0
14Ø X 9ØX 4
3.0
300
3.0
17ØX 8.8Ø X 1.25
1.8
180
1.0
OD X ID X H
Surface magnetic
flux density
magnetic
absorption
kG
mT
kgf
18Ø X 7Ø X 6
3.6
360
5.5
19Ø X 6.5Ø X 10
4.5
450
8.4
23Ø X 8Ø X 3.5
3.0
300
3.5
23Ø X 8Ø X 14
4.2
420
12.0
23Ø X 13Ø X 1
1.3
130
1.8
25Ø X 7Ø X 6
3.6
360
7.3
26Ø X 20Ø X 6
3.5
350
5.5
31.2Ø X 18.2Ø X 1
1.2
120
3.2
39Ø X 19Ø X 7
4.5
450
20.0
59Ø X 19Ø X 10
4.5
450
45.0
70Ø X 32Ø X 15
4.5
450
50.0
76Ø X 42Ø X 6
3.5
350
55.0
98Ø X 58Ø X 10
4.0
400
65.0
•Surface magnetic flux density and the magnetic absorption are values for reference.
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Ring Type (Disk Type)
OD X ID X H
Poles
26Ø X 20Ø X 4.7
4 poles
48Ø X 25Ø X 3.5
4 poles
60Ø X 30Ø X 8
8 poles
Multipole pattern viewed with magnetic viewer
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Bar Type (Square Type)
W X H X L
Surface magnetic
flux density
magnetic
absorption
kG
mT
kgf
0.6 X 2 X 7
3.0
300
0.01
4 X 4 X 12
4.5
450
0.6
•Surface magnetic flux density and the magnetic absorption are values for reference.
W X H X L
Surface magnetic
flux density
magnetic
absorption
kG
mT
kgf
4 X 7.5 X 12
4.4
440
1.0
5 X 5 X 10
4.0
400
0.9
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Bar Type (Round Type)
OD X L
Surface magnetic
flux density
magnetic
absorption
kG
mT
kgf
0.5Ø X 5
1.5
150
0.01
1 Ø X 5
1.5
150
0.05
1.4 Ø X 5
1.5
150
0.08
1.5 Ø X 8
2.0
200
0.09
2 Ø X 5.5
3.5
350
0.12
2 Ø X 7
3.8
380
0.2
2.3 Ø X 4.5
3.3
330
0.15
2.5 Ø X 6
3.6
360
0.23
3 Ø X 5
3.4
340
0.4
3 Ø X 6
3.6
360
0.42
3 Ø X 10
4.0
400
0.5
4 Ø X 8
4.0
400
0.7
5 Ø X 8
3.7
370
0.8
OD X L
Surface magnetic
flux density
magnetic
absorption
kG
mT
kgf
5 Ø X 10
4.0
400
0.9
6 Ø X 10
4.0
400
1.1
6 Ø X 23
5.0
500
2.5
9 Ø X 10
4.2
420
2.2
16 Ø X 30
5.0
500
15.0
17.5 Ø X 20
4.7
470
17.0
19 Ø X 40
5.2
520
19.0
22.5 Ø X 25
5.0
500
24.0
23.5 Ø X 25
5.0
500
27.0
•Surface magnetic flux density and the magnetic absorption is a value for reference.
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Square Type
L X W X H
Surface magnetic
flux density
magnetic
absorption
kG
mT
kgf
2.4 X 2.4 X 1.8
2.0
200
0.04
4 X 4 X 2
2.0
200
0.3
6 X 6 X 4.5
3.2
320
0.85
6.8 X 4 X 2
2.8
280
0.45
9 X 7 X 3
3.1
310
1.1
10 X 3 X 3
3.3
330
0.65
10 X 5 X 1
1.4
140
0.35
10 X 10 X 2
2.0
200
1.5
10 X 10 X 4
3.1
310
2.2
10 X 10 X 8
3.6
360
2.8
10 X 10 X 10
4.2
420
3.6
12 X 7 X 4
3.5
350
1.8
12 X 10 X 4
3.3
330
2.9
15 X 5 X 3
3.2
320
1.5
15 X 6 X 2.8
3.0
300
1.6
15 X 10 X 5
3.5
350
3.3
18 X 3.25 X 4.1
3.5
350
1.0
20 X 4.15 X 2.15
2.6
260
1.9
20 X 10 X 4
2.8
280
4.8
20 X 10 X 10
3.2
320
7.1
20 X 12 X 5
3.0
300
6.0
20 X 15 X 5
3.0
300
6.3
22 X 21 X 5
2.9
290
7.2
23 X 23 X 10
3.3
330
8.5
L X W X H
Surface magnetic
flux density
magnetic
absorption
kG
mT
kgf
1)24 X 24 X 12.5
4.2
420
23.0
25.4 X 9.6 X 9.6
4.0
400
12.0
25.4 X 25.4 X 12.7
4.0
400
23.5
26 X 20 X 6
3.3
330
9.5
29.5 X4.15 X 2.15
2.5
250
2.2
30 X 30 X 5
3.0
300
12.0
30 X 30 X 10
4.0
400
23.0
3) 30 X 30 X 10
4.0
400
23.0
40 X 11 X 6
3.5
350
8.4
40 X 15 X 5
3.0
300
9
40 X 40 X 10
4.0
400
38.0
46 X 30 X 10
4.0
400
35.0
50 X 10 X 2
2.0
200
4.5
50.8 X 50.8 X 12.7
4.0
400
65.0