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NdFeB Magnet

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℃.

Round Type

round NdFeB Magnet
OD × H Surface magnetic
flux density
magnetic
absorption
kG mT kg
1) 1.2Φ × 2 1.3 130 0.04
1.5 Φ× 1.5 2.8 280 0.05
2 Φ× 2 2.7 270 0.07
2Φ × 3 3.2 320 0.08
3 Φ × 1.5 3.1 310 0.17
3 Φ × 1.8 3.2 320 0.25
3 Φ × 2.5 3.3 330 0.3
3 Φ × 3 3.4 340 0.35
3 Φ × 4 3.5 350 0.38
4 Φ × 1.5 2.7 270 0.25
4 Φ × 2 3.0 300 0.3
4 Φ × 3 3.5 350 0.4
4 Φ × 4 3.9 390 0.5
4 Φ × 5 4.2 420 0.55
5 Φ × 1 1.5 150 0.2
2) 5 Φ × 1.5 2.0 200 0.3
2) 5 Φ × 2 2.8 280 0.35
5 Φ × 3 3.5 350 0.44
5 Φ × 4 3.8 380 0.56
5 Φ × 5 4.0 400 0.65
5 .5Φ × 1.7 2.1 210 0.3
6 Φ × 2 2.2 220 0.4
6 Φ × 5 3.5 350 0.75
7 Φ × 2 3.0 300 0.7
7 Φ × 3 3.5 350 0.77
8 Φ × 2 2.2 220 0.65
8 Φ × 3 3.5 350 1.1
8 Φ × 4 3.6 360 1.25
8 Φ × 5 4.0 400 1.4
8 Φ × 8 4.2 420 1.8
9 Φ × 3 3.2 320 1.2
9.4Φ × 0.8 1.5 150 0.4
10 Φ × 2 3.5 350 1.35
O × H Surface magnetic 
flux density
magnetic
absorption
kG mT kg
10 Φ × 3 3.5 350 1.45
10 Φ × 4 3.5 350 1.6
10 Φ × 5 3.5 350 2.2
10 Φ × 10 4.8 480 3.65
12 Φ × 1.3 2.0 200 1.45
12.5 Φ × 1.5 2.0 200 1.8
12.5 Φ × 2 2.0 200 1.9
13 Φ × 10 4.8 480 6.1
14 Φ × 10 4.5 450 6.4
15 Φ × 1.5 1.8 180 1.1
15 Φ × 1.7 2.0 200 1.3
15 Φ × 3 3.2 320 3.7
15 Φ × 4 3.3 330 4
15 Φ × 5 3.3 330 4.5
15 Φ × 10 4.2 420 6.8
16 Φ × 10 4.2 420 7.2
17.9 Φ × 2.5 2.7 270 2.5
19 Φ × 10 4.0 400 9.8
20 Φ × 5 2.8 280 6.3
21 Φ × 4.6 3.2 320 7.0
22 Φ × 10 4.5 450 15.3
23.5 Φ × 3.4 2.0 200 4
23.5 Φ × 4.5 2.2 220 4.8
23.5 Φ × 5 2.4 240 5.6
25 Φ × 3.4 1.8 180 4.2
25 Φ × 5 2.5 250 7.5
25 Φ × 6 3.0 300 9
25 Φ × 9.8 3.5 350 20.0
30 Φ × 15 5.0 500 22.0
32 Φ × 10.5 4.0 400 26.0
40 Φ × 10 3.8 380 35.0
100 Φ × 15 3.7 370 75.0
180 Φ × 5-50 3.7 370 75.0

1) Gold plated, 2) Gold or Ni plated

  1. Surface magnetic flux density and the magnetic absorption are values for reference.

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Ring Type

ring type NdFeB Magnet
OD × ID × H Surface magnetic 
flux density
magnetic
absorption
kG mT kg
6Φ × 3Φ × 4 3.3 330 0.4
6.6Φ × 2Φ × 1.5 2.0 200 0.28
8Φ × 2Φ × 2.5 3.0 300 0.9
8Φ × 4Φ × 5 3.7 370 1.2
10Φ × 5Φ × 5 3.6 360 1.8
10Φ × 6Φ × 1 1.7 170 0.7
10Φ × 6Φ × 10 3.3 330 2.5
10.5Φ × 7.6Φ × 1 1.6 160 0.7
11Φ × 4Φ × 10 3.2 320 3.2
12Φ × 7Φ × 6 3.6 360 2.2
13.5Φ × 5Φ× 2 2.2 220 1.0
14Φ × 9Φ× 4 3.0 300 3.0
17Φ× 8.8Φ × 1.25 1.8 180 1.0
OD × ID × H Surface magnetic 
flux density
magnetic
absorption
kG mT kg
18Φ × 7Φ × 6 3.6 360 5.5
19Φ × 6.5Φ × 10 4.5 450 8.4
23Φ × 8Φ × 3.5 3.0 300 3.5
23Φ × 8Φ × 14 4.2 420 12.0
23Φ × 13Φ × 1 1.3 130 1.8
25Φ × 7Φ × 6 3.6 360 7.3
26Φ × 20Φ × 6 3.5 350 5.5
31.2Φ × 18.2Φ × 1 1.2 120 3.2
39Φ × 19Φ × 7 4.5 450 20.0
59Φ × 19Φ × 10 4.5 450 45.0
70Φ × 32Φ × 15 4.5 450 50.0
76Φ × 42Φ × 6 3.5 350 55.0
98Φ × 58Φ × 10 4.0 400 65.0
180Φ × 160Φ × 5-50 4.0 400 65.0
  1. Surface magnetic flux density and the magnetic absorption are values for reference.

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Ring Type (Disk Type)

disk type NdFeB Magnet
OD × ID × H Poles
8Φ × 3Φ × 1.2 4 poles
10Φ × 4Φ × 1.2 4 poles
12Φ × 4Φ × 1.5 4 poles
15Φ × 4Φ × 2 4 poles
26Φ × 20Φ × 4.7 4 poles
48Φ × 25Φ × 3.5 4 poles
60Φ × 30Φ × 5 8 poles

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Bar Type (Square Type)

bar type type NdFeB Magnet,square type type NdFeB Magnet
W × H × L Surface magnetic 
flux density
magnetic
absorption
kG mT kg
0.6 × 2 × 7 3.0 300 0.01
4 × 4 × 12 4.5 450 0.6
  1. Surface magnetic flux density and the magnetic absorption are values for reference.
W × H × L Surface magnetic 
flux density
magnetic
absorption
kG mT kg
4 × 7.5 × 12 4.4 440 1.0
5 × 5 × 10 4.0 400 0.9

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Bar Type (Round Type)

bar type NdFeB Magnet,round type NdFeB Magnet
OD × L Surface magnetic 
flux density
magnetic
absorption
kG mT kg
0.5Φ × 5 1.5 150 0.01
1 Φ × 5 1.5 150 0.05
1.4 Φ × 5 1.5 150 0.08
1.5 Φ × 8 2.0 200 0.09
2 Φ × 5.5 3.5 350 0.12
2 Φ × 7 3.8 380 0.2
2.3 Φ × 4.5 3.3 330 0.15
2.5 Φ × 6 3.6 360 0.23
3 Φ × 5 3.4 340 0.4
3 Φ × 6 3.6 360 0.42
3 Φ × 10 4.0 400 0.5
4 Φ × 8 4.0 400 0.7
5 Φ × 8 3.7 370 0.8
OD × L Surface magnetic 
flux density
magnetic
absorption
kG mT kg
5 Φ × 10 4.0 400 0.9
6 Φ × 10 4.0 400 1.1
6 Φ × 23 5.0 500 2.5
9 Φ × 10 4.2 420 2.2
16 Φ × 30 5.0 500 15.0
17.5 Φ × 20 4.7 470 17.0
19 Φ × 40 5.2 520 19.0
22.5 Φ × 25 5.0 500 24.0
23.5 Φ × 25 5.0 500 27.0
  1. Surface magnetic flux density and the magnetic absorption is a value for reference.

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Square Type

square type NdFeB Magnet
L × W × H Surface magnetic 
flux density
magnetic
absorption
kG mT kg
2.4 × 2.4 × 1.8 2.0 200 0.04
4 × 4 × 2 2.0 200 0.3
6 × 6 × 4.5 3.2 320 0.85
6.8 × 4 × 2 2.8 280 0.45
9 × 7 × 3 3.1 310 1.1
10 × 3 × 3 3.3 330 0.65
10 × 5 × 1 1.4 140 0.35
10 × 10 × 2 2.0 200 1.5
10 × 10 × 4 3.1 310 2.2
10 × 10 × 8 3.6 360 2.8
10 × 10 × 10 4.2 420 3.6
12 × 7 × 4 3.5 350 1.8
12 × 10 × 4 3.3 330 2.9
15 × 5 × 3 3.2 320 1.5
15 × 6 × 2.8 3.0 300 1.6
15 × 10 × 5 3.5 350 3.3
18 × 3.25 × 4.1 3.5 350 1.0
20 × 4.15 × 2.15 2.6 260 1.9
20 × 10 × 4 2.8 280 4.8
20 × 10 × 10 3.2 320 7.1
20 × 12 × 5 3.0 300 6.0
20 × 15 × 5 3.0 300 6.3
22 × 21 × 5 2.9 290 7.2
23 × 23 × 10 3.3 330 8.5

1) Ni Plated or Epoxy coated, 2) M3 Counter sunk, 3) M5 Counter sunk

  1. Surface magnetic flux density and the magnetic absorption is a value for reference.
L × W × H Surface magnetic 
flux density
magnetic
absorption
kG mT kg
1)24 × 24 × 12.5 4.2 420 23.0
25.4 × 9.6 × 9.6 4.0 400 12.0
25.4 × 25.4 × 12.7 4.0 400 23.5
26 × 20 × 6 3.3 330 9.5
29.5 ×4.15 × 2.15 2.5 250 2.2
30 × 30 × 5 3.0 300 12.0
30 × 30 × 10 4.0 400 23.0
3) 30 × 30 × 10 4.0 400 23.0
40 × 11 × 6 3.5 350 8.4
40 × 15 × 5 3.0 300 9
40 × 40 × 10 4.0 400 38.0
46 × 30 × 10 4.0 400 35.0
50 × 10 × 2 2.0 200 4.5
50.8 × 50.8 × 12.7 4.0 400 65.0
4) 50.8 × 50.8 × 12.7 4.0 400 65.0
50.8 × 50.8 × 25.4 4.8 480 80.0
51 × 4.15 × 2.15 2.2 220 3.5
58 × 14 × 3 2.4 240 5.5
60 × 30 × 10 3.8 380 45.0
68 × 4 × 8 3.2 320 7.5
79.5 × 4.5 × 1.5 1.8 180 4.5
2)150 × 102 × 10 3.5 350 over 100
2)150 × 102 × 25 4.0 400
2)150 × 150 × 5-50 4.0 400

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Diametrically Magnetized Type

Diametrically Magnetized Type NdFeB Magnet
OD × H (ID) Surface magnetic 
flux density
kg mT
3.4Φ × 7.6 (1.1Φ) 3.5 350
4Φ × 10 4.1 410
13Φ × 20 5.0 500
  1. Surface magnetic flux density is a value for reference.

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Flat Round Type

flat round type NdFeB Magnet
Size Surface magnetic 
flux density
kg kg
0.5 × 0.5 × 0.5 1.0 100
1Φ × 0.5 1.5 150
1.46Φ × 0.98 2.4 240
2 Φ × 0.5 1.5 150
  1. Surface magnetic flux density is a value for reference.
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