Grades of Alnico

The Alnico magnets have a potentially oversimplified nomenclature. With a small bit of additional information, it is easy to clarify every single grade.

There are many grades of Alnico magnet. We offer 17 grades of Cast Alnico, 10 grades of Sintered Alnico and 2 grades of bonded Alnico.

The range of grades cover what is known to many as Alnico 2, Alnico 3, Alnico 5, Alnico 6, Alnico 8 and Alnico9, Alnico5-7 and Alnico5DG. Other names exist for Alnico but they tend to be trade names.

Nomenclature of Alnico grades

Anisotropic Cast Alnico (ACA)

Minimum Values

Material

Br

Hcb (Hc)

Hcj (Hci)

(BH)max

T

kG

kA/m

kOe

kA/m

kOe

kJ/m^3

MGOe

Alnico 5 (Alnico5_ACA34)

1.10

11.0

50.00

0.63

52.00

0.65

34

4.25

Alnico 5 (Alnico5_ACA37)

1.18

11.8

50.00

0.61

51

0.64

37

4.63

Alnico 5 (Alnico5_ACA40)

1.20

12.0

50.00

0.63

52.00

0.65

40.00

5.00

Alnico 5 (Alnico5_ACA44)

1.25

12.5

50.00

0.65

54

0.68

44

5.50

Alnico 6 (Alnico6_ACA28)

1.15

11.50

58.00

0.73

60.00

0.75

28.00

3.50

Alnico 5DG (Alnico5DG_ACA52)

1.30

13.0

56.00

0.70

58.00

0.73

52.00

6.50

Alnico 5-7 (Alnico5-7_ACA60)

1.35

13.50

58.00

0.73

60.00

0.75

60.00

7.50

Alnico 8 (Alnico8_ACA38)

0.80

8.0

110

1.38

112

1.4

38

4.75

Alnico 8 (Alnico8_ACA40)

0.85

8.50

115.00

1.44

117.00

1.46

40.00

5.00

Alnico 8 (Alnico8_ACA44)

0.90

9.0

115.00

1.44

117.00

1.46

44

5.50

Alnico 8HC (Alnico8HC_ACA36)

0.72

7.20

150.00

1.18

152.00

1.90

36.00

4.50

Alnico 9 (Alnico9_ACAT60)

1.00

10.0

110

1.38

112

1.4

60

7.50

Alnico 9 (Alnico9_ACAT72)

1.05

10.50

115.00

1.44

117.00

1.46

72.00

9.00

Alnico 9 (Alnico9_ACAT80)

1.08

10.8

120

1.50

122

1.53

80

10.00

Anisotropic Sintered Alnico (ASA)

Minimum Values

Material

Br

Hcb (Hc)

Hcj (Hci)

(BH)max

T

kG

kA/m

kOe

kA/m

kOe

kJ/m^3

MGOe

Alnico 5 (Alnico5_ASA34)

1.15

11.5

48

0.6

50

0.63

34

4.25

Alnico 6 (Alnico6_ASA28)

1.1

11

58

0.73

60

0.75

28

3.5

Alnico 8HC (Alnico8HC_ASA36)

0.72

7.2

150

1.88

152

1.9

36

4.5

Alnico 8 (Alnico8_ASA38)

0.8

8

110

1.38

112

1.4

38

4.75

Alnico 8 (Alnico8_ASA44)

0.85

8.5

120

1.5

122

1.53

44

5.5

Alnico 8 (Alnico8_ASA48)

0.92

9.2

125

1.56

127

1.59

48

5.5

Isotropic Cast Alnico (ICA)

Minimum Values

Material

Br

Hcb (Hc)

Hcj (Hci)

(BH)max

T

kG

kA/m

kOe

kA/m

kOe

kJ/m^3

MGOe

Alnico 3 (Alnico3_ICA10)

0.65

6.5

38

0.48

40

0.50

10

1.25

Alnico 2 (Alnico2_ICA12)

0.75

7.5

45

0.56

46

0.58

12

1.50

Alnico 8 (Alnico8_ICA18)

0.55

5.5

90

1.21

97

1.21

18

2.25

Isotropic Cast Alnico (ICA)

Minimum Values

Material

Br

Hcb (Hc)

Hcj (Hci)

(BH)max

T

kG

kA/m

kOe

kA/m

kOe

kJ/m^3

MGOe

Alnico 3 (Alnico3_ICA10)

0.65

6.5

38

0.48

40

0.50

10

1.25

Alnico 2 (Alnico2_ICA12)

0.75

7.5

45

0.56

46

0.58

12

1.50

Alnico 8 (Alnico8_ICA18)

0.55

5.5

90

1.21

97

1.21

18

2.25

Isotropic Sintered Alnico (ISA)

Minimum Values

Material

Br

Hcb (Hc)

Hcj (Hci)

(BH)max

T

kG

kA/m

kOe

kA/m

kOe

kJ/m^3

MGOe

Alnico 3 (Alnico3_ISA10)

0.65

6.5

40

0.50

42

0.53

10

1.25

Alnico 2 (Alnico2_ISA12)

0.75

7.5

45

0.56

46

0.58

12

1.50

Alnico 8 (Alnico8_ISA18)

0.60

6.0

95

1.19

98

1.23

18

2.25

Alnico 8 (Alnico8_ISA20)

0.62

6.2

100

1.25

105

1.31

20

2.50

Bonded Alnico (BA)

Minimum Values

Material

Br

Hcb (Hc)

Hcj (Hci)

(BH)max

T

kG

kA/m

kOe

kA/m

kOe

kJ/m^3

MGOe

Alnico_BA7

0.31

3.1

79

1

103

0.85

6.77

0.86

Alnico_BA8

0.34

3.4

83

1.05

107

1

7.96

1

Bonded Alnico (BA)

Minimum Values

Material

Br

Hcb (Hc)

Hcj (Hci)

(BH)max

T

kG

kA/m

kOe

kA/m

kOe

kJ/m^3

MGOe

Alnico_BA7

0.31

3.1

79

1.00

103

0.85

6.77

0.86

Alnico_BA8

0.34

3.4

83

1.05

107

1.00

7.96

1.00

Many magnet suppliers provide only a single BH curve for Alnico

Many magnet suppliers provide only a single BH curve for Alnico, which is almost always the Normal curve. Whilst the Normal curve and the Intrinsic curve are nearly identical in Alnico, when designing for temperature and external magnetic field effects, the Intrinsic BH curve has to be used for accurate results. Although this may not be seen as logical when looking at Alnico BH curves, when designing with BH curves for NdFeB, SmCo or Ferrite, the difference between the Normal and BH curves is much clearer to see and designing with the Normal curve would give highly inaccurate results. ).

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