Neodymium magnet (strong magnet)

Neodymium magnet standard product

There are two types of rare earth magnets: neodymium magnets (neodymium Nd-Fe-B) and samarium-cobalt magnets (Sm-Co).
Neodymium magnets create a strong magnetic field that is said to be the strongest in the world on the current market.Depending on the application, the shape can be processed into a round shape, a square shape, a ring shape, etc.Although it has excellent mechanical strength, it is surface-treated because it is easily rusted, and it is generally required to be used at 80 ° C or lower.
Neodymium magnet
Why are neodymium magnets so powerful?
Neodymium magnets are magnets whose main component is neodymium (Nd) and are the strongest magnets currently available.
With excellent coercive force and high magnetic flux density, it exerts the strongest class of magnetic force. This is due to the properties of rare earth elements such as neodymium.
Neodymium magnets are about 10 times stronger than ferrite magnets, and are small and lightweight, making them suitable for a wide range of applications. For example, even a 1cm diameter neodymium magnet can reach an adhesive force of about 3kgf, and a 2cm diameter magnet can reach an adhesive force of about 15kgf.

By utilizing this strength, we can replace magnets without changing the shape, resulting in a significant increase in power, or a smaller, lighter, and more energy-efficient product with the same output.Specific examples include motors, speakers, earphones, and the list goes on.

Round type (cylindrical type) Ring type (cylindrical type) Ring type (disk type) Bar type (square type) Bar type (cylindrical type) Square type Radial magnetization type (cylindrical type) Ultra-thin type Ball type

Round (cylindrical type)

neodymium magnet round
Unit: mm
OD x H Surface magnetic flux density Adsorption power Remarks
mT kG N kgf
1φ x 1 130 1.3 0.31 0.03  
1φ x 2 140 1.4 0.37 0.04  
1φ x 3 150 1.5 0.38 0.04  
1φ x 4 150 1.5 0.38 0.04  
1.2φ x 2 130 1.3 0.54 0.06 1)
1.5φ x 1 240 2.4 0.6 0.06  
1.5φ x 1.5 280 2.8 0.75 0.08  
1.5φ x 2 280 2.8 0.83 0.09  
1.5φ x 3 300 3.0 0.89 0.09  
1.5φ x 4 300 3.0 0.91 0.09  
1.5φ x 5 300 3.0 0.93 0.10  
2φ x 1 260 2.6 0.88 0.09  
2φ x 2 270 2.7 1.39 0.14  
2φ x 3 320 3.2 1.57 0.16  
2φ x 4 360 3.6 1.65 0.17  
3φ x 1 270 2.7 1.35 0.14  
3φ x 1.5 310 3.1 2.05 0.21  
3φ x 1.8 320 3.2 2.41 0.25  
3φ x 2 350 3.5 2.61 0.27  
3φ x 2.5 330 3.3 2.99 0.31  
3φ x 3 340 3.4 3.25 0.33  
3φ x 4 350 3.5 3.57 0.36  
4φ x 1 240 2.4 1.91 0.20  
4φ x 1.5 270 2.7 2.69 0.27  
4φ x 2 300 3.0 3.69 0.38  
4φ x 3 350 3.5 5.10 0.52  
4φ x 4 390 3.9 5.88 0.60  
4φ x 5 420 4.2 6.34 0.65  
5φ x 1 150 1.5 2.53 0.26  
5φ x 1.5 200 2.0 3.50 0.36 2)
5φ x 2 320 3.2 4.57 0.47  
5φ x 3 350 3.5 6.87 0.70  
5φ x 4 380 3.8 8.35 0.85  
5φ x 5 400 4.0 9.29 0.95  
5φ x 6 470 4.7 9.90 1.01  
5.5φ x 1.7 210 2.1 4.36 0.45  
6φ× 1 200 2.0 3.20 0.33  
6φ x 2 220 2.2 5.54 0.57  
6φ x 3 290 2.9 8.45 0.86  
6φ x 4 430 4.3 10.78 1.10  
6φ x 5 350 3.5 12.39 1.26  
7φ x 1 160 1.6 3.91 0.40  
7φ x 1.5 230 2.3 5.19 0.53  
7φ x 2 300 3.0 6.64 0.68  
7φ x 3 350 3.5 9.80 1.00  
7φ x 4 420 4.2 13.07 1.33  
7φ x 5 440 4.4 15.48 1.58  
8φ x 1 180 1.8 4.80 0.49  
8φ x 2 220 2.2 7.79 0.80  
8φ x 3 350 3.5 10.96 1.12  
8φ x 4 360 3.6 15.13 1.54  
8φ x 5 400 4.0 18.43 1.88  
8φ x 6 420 4.2 20.93 2.13  
OD x H Surface magnetic flux density Adsorption power Remarks
mT kG N kgf
8φ x 8 450 4.5 24.16 2.47  
9φ x 1 130 1.3 5.19 0.53  
9φ x 2 240 2.4 8.99 0.92  
9φ x 3 320 3.2 12.58 1.28  
9φ x 4 390 3.9 16.98 1.73  
9φ x 5 410 4.1 21.22 2.16  
9.4φ x 0.8 150 1.5 3.84 0.39  
10φ x 1 180 1.8 5.51 0.56  
10φ x 2 260 2.6 10.23 1.04  
10φ x 3 350 3.5 14.22 1.45  
10φ x 4 380 3.8 18.57 1.90  
10φ x 5 420 4.2 23.76 2.42  
10φ x 6 430 4.3 28.04 2.86  
10φ x 8 470 4.7 34.13 3.48  
10φ x 10 480 4.8 37.94 3.87  
12φ x 1.3 200 2.0 8.91 0.91  
12φ x 2 280 2.8 12.89 1.31  
12φ x 3 350 3.5 17.64 1.80  
12φ x 5 400 4.0 28.18 2.87  
12φ x 8 450 4.5 43.90 4.48  
12.5φ x 1.5 200 2.0 11.13 1.14  
12.5φ x 2 200 2.0 13.56 1.38  
13φ x 10 480 4.8 56.61 5.78  
14φ x 10 450 4.5 62.77 6.41  
15φ x 1 180 1.8 6.73 0.69  
15φ x 1.5 180 1.8 12.43 1.27  
15φ x 1.7 200 2.0 14.84 1.51  
15φ x 2 260 2.6 17.22 1.76  
15φ x 3 320 3.2 23.10 2.36  
15φ x 4 330 3.3 29.12 2.97  
15φ x 5 330 3.3 35.17 3.59  
15φ x 6 450 4.5 42.05 4.29  
15φ x 8 460 4.6 57.27 5.84  
15φ x 10 420 4.2 68.79 7.02  
16φ x 10 420 4.2 74.64 7.62  
17.9φ x 2.5 270 2.7 25.33 2.59  
19φ x 10 400 4.0 90.93 9.28  
20φ x 3 280 2.8 33.28 3.39  
20φ x 5 330 3.3 49.18 5.02  
21φ x 4.6 320 3.2 48.73 4.97  
22φ x 10 450 4.5 105.13 10.73  
23.5φ x 3.4 200 2.0 44.80 4.57  
23.5φ x 4.5 220 2.2 54.98 5.61  
23.5φ x 5 240 2.4 59.66 6.09  
24φ x 20 500 5.0 203.26 20.74  
25φ x 3.4 180 1.8 48.57 4.96  
25φ x 5 250 2.5 64.36 6.57  
25φ x 6 300 3.0 74.40 7.59  
25φ x 9.8 350 3.5 114.38 11.67  
30φ x 15 500 5.0 216.46 22.09  
32φ x 10.5 400 4.0 167.67 17.11  
40φ x 10 380 3.8 197.33 20.14  
50φ x 20 510 5.1 470.58 48.02  

1) Gold plating 2) Compatible with both gold plating and Ni plating
* Surface magnetic flux density and suction force are reference values.

Bar type (cylindrical type)

neodymium magnet bar type
Unit: mm
OD x L Surface magnetic flux density Adsorption power
mT kG N kgf
1φ x 5 150 1.5 0.39 0.04
1.4φ x 5 150 1.5 0.80 0.08
1.5φ x 8 200 2.0 0.94 0.10
2φ x 5.5 350 3.5 1.69 0.17
2φ x 7 380 3.8 1.72 0.18
2.3φ x 4.5 330 3.3 2.20 0.22
2.5φ x 6 360 3.6 2.67 0.27
3φ x 5 340 3.4 3.73 0.38
3φ x 6 360 3.6 3.82 0.39
3φ x 10 400 4.0 3.98 0.41
4φ x 8 400 4.0 6.92 0.71
5φ x 8 370 3.7 10.57 1.08
OD x L Surface magnetic flux density Adsorption power
mT kG N kgf
5φ x 10 400 4.0 10.93 1.12
5.5φ x 8 390 3.9 12.61 1.29
6φ x 8 500 5.0 14.77 1.51
6φ x 10 510 5.1 15.44 1.58
6φ x 23 520 5.2 16.56 1.69
8φ x 10 500 5.0 25.99 2.65  
9φ x 10 420 4.2 31.86 3.25
13φ x 20 550 5.5 64.47 6.58
16φ x 30 500 5.0 114.21 11.65
17.5φ x 20 470 4.7 122.96 12.55
22.5φ x 25 500 5.0 228.14 23.28
23.5φ x 25 500 5.0 229.12 23.38

* Surface magnetic flux density and suction force are reference values.

Radial magnetization type (cylindrical type)

Neodymium magnet radial magnetization type
Unit: mm
OD x H [ID] Surface magnetic flux density
mT kG
8φ x 1 270 2.7
2.2φ x 5.8 350 3.5
3.4φ x 7.6 (1.1φ) 350 3.5
4φ x 10 410 4.1
13φ x 20 500 5.0

* The surface magnetic flux density is a reference value.

Ring type (cylindrical type)

neodymium magnet ring type
Unit: mm
OD x ID x H Surface magnetic flux density Adsorption power
mT kG N kgf
5φ x 2.4φ x 3 220 2.2 6.33 0.65
6φ x 3φ x 4 330 3.3 9.39 0.96
6.6φ x 2φ x 1.5 200 2.0 6.25 0.64
8φ x 2φ x 2.5 300 3.0 12.33 1.26
8φ x 4φ x 5 370 3.7 16.78 1.71
8.5φ x 5.5φ x 0.8 100 1.0 4.96 0.51
10φ x 5φ x 5 360 3.6 24.67 2.52
10φ x 6φ x 1 170 1.7 7.16 0.73
10φ x 6φ x 10 330 3.3 25.63 2.62
10.5φ x 7.6φ x 1 160 1.6 8.61 0.88
11φ x 4φ x 10 320 3.2 40.19 4.10
12φ x 6φ x 0.8 160 1.6 7.56 0.77
12φ x 6φ x 2 300 3.0 17.33 1.77
12φ x 7φ x 6 360 3.6 32.90 3.36
13.5φ x 5φ x 2 220 2.2 17.18 1.75
14φ x 9φ x 4 300 3.0 33.93 3.46
OD x ID x H Surface magnetic flux density Adsorption power
mT kG N kgf
14.2φ x 10φ x 2 300 3.0 21.66 2.21
17φ x 8.8φ x 1.25 180 1.8 17.88 1.82
18φ x 7φ x 6 360 3.6 69.42 7.08
19φ x 6.5φ x 10 450 4.5 101.35 10.34
23φ x 8φ x 3.5 300 3.0 51.03 5.21
23φ x 8φ x 14 420 4.2 158.64 16.19
23φ x 13φ x 1 130 1.3 16.73 1.71
25φ x 7φ x 6 360 3.6 97.96 10.00
26φ x 20φ x 6 350 3.5 89.38 9.12
31.2φ x 18.2φ x 1 120 1.2 19.76 2.02
39φ x 19φ x 7 350 3.5 179.04 18.27
59φ x 19φ x 10 450 4.5 401.21 40.94
70φ x 32φ x 15 450 4.5 765.14 78.08
76φ x 42φ x 6 350 3.5 415.31 42.38
98φ x 58φ x 10 400 4.0 741.61 75.67

* Surface magnetic flux density and suction force are reference values.

Ring type (disc type)

Neodymium magnet ring type (disc type) Neodymium magnet ring type (disc type)Magnetization pattern seen by the viewer
Unit: mm
OD x ID x H Number of poles
26φ x 20φ x 4.7 4-pole magnetization
48φ x 25φ x 3.5 4-pole magnetization
60φ x 30φ x 8 8-pole magnetization

Super Usu type

Neodymium magnet super thin type
Unit: mm
Size Surface magnetic flux density Remarks
mT kG
0.5 × × 0.5 0.5 100 1.0  
1φ x 0.5 150 1.5  
1.46φ x 0.98 240 2.4  
2φ x 0.5 150 1.5  

* The surface magnetic flux density is a reference value.

Square

square neodymium magnet
Unit: mm
L × W × H Surface magnetic flux density Adsorption power Remarks
mT kG N kgf
2.4 × × 2.4 1.8 200 2.0 2.07 0.21  
4 × × 4 2 200 2.0 4.13 0.42  
6 × × 6 4.5 320 3.2 13.53 1.38  
6.8 × × 4 2 280 2.8 5.58 0.57  
8 × × 5 1.8 250 2.5 6.09 0.62  
9 × × 5 1.5 230 2.3 4.98 0.51  
9 × × 7 3 310 3.1 12.34 1.26  
10 × × 3 3 330 3.3 9.71 0.99  
10 × × 5 1 140 1.4 4.35 0.44  
10 × × 10 2 200 2.0 10.05 1.03  
10 × × 10 4 310 3.1 20.56 2.10  
10 × × 10 6 420 4.2 31.75 3.24  
10 × × 10 8 460 4.6 39.77 4.06  
10 × × 10 10 490 4.9 45.08 4.60  
12 × × 7 4 350 3.5 19.82 2.02  
12 × × 10 4 330 3.3 22.68 2.31  
15 × × 5 3 320 3.2 16.69 1.70  
15 × × 6 2.8 300 3.0 16.51 1.69  
15 × × 10 5 350 3.5 32.53 3.32  
16 × × 3.25 4.1 430 4.3 22.32 2.28  
18 × × 3 3 340 3.4 16.37 1.67  
18 × × 3 4 350 3.5 19.53 1.99  
18 × × 3.25 4.1 350 3.5 24.79 2.53  
20 × × 10 4 280 2.8 32.76 3.34  
20 × × 10 5 320 3.2 40.28 4.11  
20 × × 10 10 460 4.6 75.29 7.68  
20 × × 12 5 300 3.0 42.36 4.32  
L × W × H Surface magnetic flux density Adsorption power Remarks
mT kG N kgf
20 × × 15 5 300 3.0 45.25 4.62  
20 × × 18 7.5 440 4.4 73.80 7.53  
22 × × 21 5 290 2.9 54.41 5.55  
23 × × 23 10 330 3.3 119.81 12.23  
24 × × 24 12.5 420 4.2 160.53 16.38  
25.4 × × 9.6 9.6 400 4.0 85.55 8.73  
25.4 × × 25.4 12.7 400 4.0 224.36 22.89  
26 × × 20 6 330 3.3 71.09 7.25  
28 × × 13 4 330 3.3 41.41 4.23  
29.5 × × 4.15 2.15 250 2.5 28.80 2.94  
30 × × 10 8 420 4.2 85.15 8.69  
30 × × 30 5 300 3.0 76.18 7.77  
30 × × 30 10 400 4.0 154.77 15.79  
30 × × 30 10 400 4.0 154.77 15.79 1)
40 × × 11 6 350 3.5 93.25 9.52  
40 × × 15 5 300 3.0 83.96 8.57  
40 × × 40 10 400 4.0 203.37 20.75  
46 × × 30 10 400 4.0 200.21 20.43  
50 × × 10 2 200 2.0 60.56 6.18  
50.8 × × 50.8 12.7 400 4.0 328.21 33.49  
50.8 × × 50.8 12.7 400 4.0 328.21 33.49 2)
50.8 × × 50.8 25.4 480 4.8 690.66 70.48  
58 × × 14 3 240 2.4 92.94 9.48  
60 × × 30 10 380 3.8 250.42 25.55  
68 × × 4 8 320 3.2 101.01 10.31  
79.5 × × 4.5 1.5 180 1.8 102.99 10.51 3)

1) With holes for M3 countersunk screws 2) With holes for M5 countersunk screws 3) Limited to stock
* Surface magnetic flux density and suction force are reference values.

Bar type (square type)

Neodymium magnet bar type (square type)
Unit: mm
W × H × L Surface magnetic flux density Adsorption power
mT kG N kgf
0.6 × × 2 7 300 3.0 0.57 0.06
4 × × 4 12 450 4.5 8.92 0.91
4 × × 7.5 12 440 4.4 16.39 1.67
5 × × 5 10 400 4.0 13.48 1.38

* Surface magnetic flux density and suction force are reference values.

Ball type

neodymium magnet ball type
Unit: mm
OD surface treatment Surface magnetic flux density Remarks
mT kG
3f Gold plate 320 3.2  
5f Gold plate 450 4.5  
8f Gold plate 550 5.5  
10f Gold plate 580 5.8  
15f Gold plate 650 6.5  
3f Ni plating 320 3.2 1)
5f Ni plating 450 4.5  
8f Ni plating 550 5.5  
10f Ni plating 580 5.8  
15f Ni plating 650 6.5  

1) With 1.2φ hole Stock is limited.
The surface magnetic flux density is a reference value.