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SmCo Magnet

SmCo magnets are made of samarium and cobalt and other rare-earth elements. As part of the rare earth group of permanent magnets, SmCo magnets typically fall into two families of materials. They include rare earth Sm1Co5 and Sm2Co17 and are referred to as 1:5 and 2:17 materials.

SmCo magnets have special advantages. Besides its better corrosion & oxidation resistance, SmCo magnets have better temperature stability. SmCo magnets can be operated at higher temperature up to 300℃.

Samarium Cobalt magnets are highly resistant to corrosion and require no special surface treatment. This makes Samarium Cobalt an excellent choice for compact designs where high temperature environments may be present.

Smco magnets come in six types: round type, ring type, bar type, square type, diametrically magnetized type, and segment c type. Both types have the special advantages.

Round Type

round type SmCo Magnet
OD × H Surface magnetic
flux density
magnetic
absorption
kG mT kg
2 Φ × 2 2.8 280 0.08
3 Φ × 1 1.8 180 0.08
3 Φ × 1.5 2.0 200 0.1
3 Φ × 2 2.6 260 0.12
3 Φ × 3 2.8 280 0.15
3 Φ × 4 3.0 300 0.18
3.5 Φ × 2 2.6 260 0.16
3.9 Φ × 2.5 2.9 290 0.22
4 Φ × 0.8 1.5 150 0.1
4 Φ × 0.9 1.8 180 0.12
4 Φ × 1.5 2.0 200 0.13
4 Φ × 2 2.6 260 0.2
4 Φ × 3 3.0 300 0.24
4 Φ × 3.5 3.1 310 0.28
4 Φ × 4 3.3 330 0.32
4 Φ × 5 3.5 350 0.35
5 Φ × 1 1.8 180 0.14
5 Φ × 1.5 2.0 200 0.15
5 Φ × 2 2.5 250 0.26
5 Φ × 3 3.0 300 0.35
5 Φ × 4 3.2 320 0.43
5 Φ × 5 3.5 350 0.5
5.9 Φ × 3.5 3.0 300 0.37
6 Φ × 2 2.2 220 0.32
6 Φ × 3 2.6 260 0.36
6 Φ × 4 3.1 310 0.4
6 Φ × 5 3.5 350 0.5
6 Φ × 6 3.6 360 0.55

1) Ni plated

  1. The surface magnetic flux density and the magnetic absorption are values for reference
OD × H Surface magnetic
flux density
magnetic
absorption
kG mT kg
7 Φ × 3 2.8 280 0.61
8 Φ × 2 2.4 240 0.6
8 Φ × 2.8 2.7 270 0.75
8 Φ × 5 3.0 300 1.2
1) 8 Φ × 5 3.0 300 1.2
8 Φ × 8 3.6 360 1.45
9 Φ × 2 1.8 180 0.5
9 Φ × 3 2.2 220 0.66
9.5 Φ × 1. 5 1.5 150 0.4
9.5 Φ × 2 1.8 180 0.45
10 Φ × 2 1.8 180 0.65
10 Φ × 3 2.5 250 1.1
10 Φ × 3.5 2.7 270 1.2
10 Φ × 5 3.0 300 1.4
10 Φ × 6 3.5 350 1.6
10 Φ × 8 3.8 380 1.9
11 Φ × 1.5 1.6 160 0.8
12 Φ × 3 2.2 220 1.3
12 Φ × 8 3.8 380 3.2
12.5 Φ × 1.5 1.5 150 0.83
13.5 Φ × 10 4.2 420 4.2
15 Φ × 3 2.0 200 1.76
15 Φ × 5 3.0 300 3.25
15 Φ × 10 4.0 400 4.2
15.5 Φ × 3.9 2.4 240 2.5
17 Φ × 3 2.6 260 3.0
17.5 Φ × 3.5 2.7 270 3.1
17.5 Φ × 5 3.0 300 3.4
20 Φ × 5 2.5 250 4.0
25 Φ × 9 3.7 370 7.0

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Ring Type

ring type SmCo Magnet
OD × ID × H Surface magnetic
flu× density
magnetic
absorption
kG mT kg
3 Φ × 1.8 Φ × 4 2.9 290 0.15
5 Φ × 3.2 Φ × 3 2.5 250 0.2
6.5 Φ × 2 Φ × 1.5 2.0 200 0.2
6.5 Φ × 2 Φ × 2 2.2 220 0.25
8 Φ × 0.6 Φ × 1.5 1.8 180 0.35
9.5 Φ × 2.2 Φ × 1.4 1.5 150 0.26
10.5 Φ × 7.6 Φ × 1 1.1 110 0.3
13.2 Φ × 3 Φ × 1.5 1.5 150 1.0
14 Φ × 4 Φ × 3 2.5 250 1.4
14 Φ × 9 Φ × 8 3.3 330 2.6
16 Φ × 5 Φ × 3 2.0 200 1.46
  1. The surface magnetic flux density and the magnetic absorption are values for reference
 
OD × ID × H Surface magnetic
flu× density
magnetic
absorption
kG mT kg
17 Φ × 5 Φ × 2 1.8 180 1.48
17 Φ × 5 Φ × 5 2.5 250 2.4
19 Φ × 5.5 Φ × 2 1.8 180 1.9
20 Φ × 7 Φ × 4 2.5 250 2.9
30 Φ × 5 Φ × 5 2.5 250 7.0
30 Φ × 15.5 Φ × 5 2.5 250 5.7
36 Φ × 28 Φ × 5 2.4 240 6.3
40 Φ × 17.5 Φ × 3 2.0 200 7.1
46 Φ × 33 Φ × 2 2.0 200 6.2
60 Φ × 32 Φ × 7 3.0 300 29.0
64 Φ × 47 Φ × 15 3.5 350 35.0

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Bar Type

bar type SmCo Magnet
OD × L Surface magnetic
flu× density
magnetic
absorption
kG mT kg
2.5 Φ × 5 3.7 370 0.2
3 Φ × 5 3.7 370 0.26
3 Φ × 9 3.2 320 0.35
3.5 Φ × 6 4.0 400 0.32
4 Φ × 8.5 3.5 350 0.44
5 Φ × 10 4.0 400 0.6
5 Φ × 13 4.2 420 0.7
OD × L Surface magnetic
flu× density
magnetic
absorption
kG mT kg
5 Φ × 25 3.3 330 1.7
6 Φ × 8 3.7 370 0.7
6 Φ × 9.5 4.0 400 0.8
7 Φ × 8 3.8 380 1.3
8 Φ × 10 3.8 380 1.8
22.5 Φ × 25 4.2 420 12
  1. The surface magnetic flux density and the magnetic absorption are values for reference


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Square Type

square type SmCo Magnet
L × W × H Surface magnetic
flu× density
magnetic
absorption
kG mT kg
1) 1.2 × 1.2 × 2 1.8 180 0.05
1) 3 × 2 × 0.7 1.2 120 0.08
4 × 4 × 2 2.5 250 0.25
6 × 6 × 1.5 2.3 230 0.4
6 × 6 × 2 2.5 250 0.44
9 × 2.5 × 3.9 3.0 300 0.47
10 × 6.5 × 4 3.2 320 0.83
11 × 7 × 8 3.5 350 1.86
12 × 7 × 3 2.6 260 1.1
14 × 2 × 1 1.4 140 0.21
14.5 × 10 × 4.5 2.8 280 2.5
15 × 5 × 3 2.6 260 1.1
15 × 10 × 4 2.8 280 2.4
15 × 10 × 5 3.0 300 2.5
20 × 5 × 12 3.6 360 2.2
20 × 10 × 5 3.0 300 4
L × W× H Surface magnetic
flu× density
magnetic
absorption
kG mT kg
20 × 12 × 5 3.0 300 4.4
20 × 15 × 5 2.6 260 4.3
20 × 20 × 10 3.0 300 7.2
25 × 15 × 1.5 1.2 120 1.3
25 × 15 × 3 1.7 170 2.4
26 × 8 × 4 2.8 280 2.6
30 × 16 × 5 2.5 250 6.8
38 × 38 × 18 3.2 320 32
38 × 38 × 24.5 3.8 380 43
50 × 30 × 12 3.5 350 40
58 × 14 × 6 2.7 270 12
60 × 60 × 12 3.3 330 50
77 × 32 × 24 3.7 370 56

1) Ni plated

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

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Diametrically Magnetized Type

Diametrically Magnetized Type SmCo Magnet
OD × H [ ID ] Surface magnetic
flu× density
kg mT
1.5Φ × 0.37 ( 0.4Φ ) 1.5 150
2Φ × 9 2.4 240
4.4Φ × 8.3 ( 2.4Φ ) 2.0 200
     
  1. The surface magnetic flux density and the magnetic absorption are values for reference

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Segment C Type

Segment C Type SmCo Magnet
R × r × W × L
56 × 50 × 30 × 29
  1. The surface magnetic flux density and the magnetic absorption are values for reference
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