Magnets
Permanent Magnets Limited is a global leader in the manufacturing of AlNiCo magnets, backed by over 65 years of experience in metallurgy and magnetics.
High-performance Aluminum-Nickel-Cobalt magnets offering excellent temperature stability, corrosion resistance, and precision-cast versatility for demanding aerospace, industrial, and medical applications.
AlNiCo (Aluminum-Nickel-Cobalt) magnets are known for their excellent high-temperature stability and consistent magnetic performance. Manufactured using advanced induction melting and precision casting processes, followed by controlled heat treatment, these cast AlNiCo magnets deliver enhanced coercivity, strong energy product, and precise dimensional accuracy. With decades of proven performance, they continue to serve aerospace, instrumentation, and industrial applications reliably.
Melting of virgin elements to make ingots of IN625 alloy by Vacuum Induction melting (VIM)
High-purity raw materials are accurately weighed and prepared to achieve the desired AlNiCo alloy composition, ensuring consistency and performance.
The charge is melted using advanced induction melting techniques and carefully poured into sand or shell molds to form the required shapes.
Post-casting, components undergo cleaning to remove surface impurities and residual materials, preparing them for further processing.
Cast magnets are subjected to controlled heat treatment, including heating above the Curie temperature, to develop optimal magnetic properties.
Directional magnetic properties are achieved by aligning the material during processing, enhancing performance in specific applications.
Aging at controlled temperatures (around 600°C) improves coercivity and energy product, stabilizing the magnetic characteristics.
Precision grinding ensures tight dimensional tolerances and surface finish as per application requirements.
Magnets are magnetized to specified levels depending on the end-use, ensuring readiness for application.
Finished products are thoroughly inspected, securely packed, and dispatched as per customer specifications.
Operates effectively up to 540°C (1,004°F)
Naturally resistant to rust, suitable for harsh environments
Superior mechanical strength compared to other magnets
High remanence and energy products in select grades
Material Specifications
Table contains nominal values
Material | Density (g/cm3) | Hardness (HRC) | Curie Point (°C) | Thermal expansion coefficient 10-6/ °C | Electrical resistivity @ 25°C Ohm-cm x 10-6 | Specific Heat (Cal/gm/°C) |
|---|---|---|---|---|---|---|
AlNi | 7 | 51 | 760 | 12 | 65 | 0.11 |
CoAlNi | 7.2 | 52 | 700 | 12 | 62 | 0.11 |
Coercimax | 7.35 | 50 | 870 | 11.3 | 50 | 0.11 |
Coercimax Spl | 7.35 | 50 | 870 | 11.3 | 50 | 0.11 |
CoAlNimax (Equivalent LNG 44) | 7.35 | 50 | 870 | 11.3 | 50 | 0.11 |
AlNiCo 2 | 7.1 | 45 | 810 | 12.4 | 65 | 0.11 |
AlNiCo 3 | 6.9 | 45 | 810 | 13 | 60 | 0.11 |
AlNiCo 5 | 7.3 | 50 | 860 | 11.4 | 47 | 0.11 |
AlNiCo 5-7 | 7.3 | 50 | 860 | 11.4 | 47 | 0.11 |
AlNiCo 5 DG | 7.3 | 50 | 860 | 11.4 | 47 | 0.11 |
AlNiCo 6 | 7.3 | 50 | 860 | 11.4 | 50 | 0.11 |
Material Specifications
Table contains nominal values
Material | Remanence (Br) - Gauss | Coercivity (Hc) - Oe | Maximum energy product (BHmax) - MGOe |
|---|---|---|---|
AlNi | 5600-6700 | 510-560 | 1.1 - 1.5 |
CoAlNi | 6000-6500 | 580-630 | 1.3 - 1.5 |
Coercimax | 11100-11900 | 690-730 | 4.3 - 5.1 |
Coercimax Spl | 11700-12300 | 630-690 | 5.0 - 5.8 |
CoAlNimax (Equivalent LNG 44) | 12500-13000 | 650-700 | 5.5 - 6.0 |
AlNiCo 2 | 7500 | 560 | 1.7 |
AlNiCo 3 | 7000 | 480 | 1.35 |
AlNiCo 5 | 12800 | 640 | 5.5 |
AlNiCo 5-7 | 13500 | 740 | 7.5 |
AlNiCo 5 DG | 13300 | 670 | 6.5 |
AlNiCo 6 | 10500 | 780 | 3.9 |
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Sensors, actuators, navigation systems
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Ignition systems, fuel gauges, speedometers
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Loudspeakers, microphones, magnetic pickups
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MRI components, surgical tools
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Magnetic chucks, separators, relay magnets
A comprehensive list of standard magnet dimensions is available. Custom dimensions can be manufactured on demand. Please refer to the full table or contact us for specifications.
PML Drg No. | A (mm) | B (mm) | ØC (mm) | D (mm) |
6743 | 46.00 | 46.00 | 10.00 | 25.00 |
6742 | 59.00 | 59.00 | 10.00 | 25.00 |
6724 | 64.00 | 64.00 | 14.00 | 13.00 |
6719 | 59.00 | 59.00 | 10.00 | 20.00 |
6714 | 75.00 | 75.00 | 14.00 | 15.00 |
6710 | 15.00 | 20.00 | -- | 10.00 |
6700 | 24.00 | 31.80 | -- | 6.80 |
6677 | 46.00 | 46.00 | 12.00 | 13.00 |
6676 | 30.00 | 30.00 | -- | 20.00 |
6674 | 30.00 | 20.00 | -- | 15.00 |
6673 | 30.00 | 20.00 | -- | 10.00 |
6648 | 11.60 | 14.00 | -- | 9.80 |
11118 | 22.22 | 22.22 | -- | 12.20 |
11117 | 20.00 | 11.00 | -- | 8.00 |
11116 | 27.00 | 17.50 | -- | 11.40 |
11092 | 13.00 | 10.00 | -- | 9.00 |
11087 | 15.85 | 11.40 | -- | 8.10 |
11077 | 40.00 | 40.00 | 6.50 | 50.00 |
11072 | 8.00 | 5.90 | -- | 2.85 |
11064 | 13.50 | 20.10 | -- | 15.50 |
11063 | 14.80 | 11.60 | -- | 10.00 |
11052 | 33.35 | 33.35 | -- | 17.50 |
11049 | 23.98 | 31.60 | -- | 8.00 |
11044 | 21.00 | 12.00 | -- | 15.00 |
11043 | 13.00 | 8.00 | -- | 4.00 |
11035 | 40.00 | 50.00 | -- | 45.00 |
11034 | 42.00 | 42.00 | 15.00 | 15.00 |
11028 | 30.00 | 22.00 | -- | 15.00 |
11027 | 50.70 | 50.70 | 9.00 x 2 | 40.60 |
11026 | 45.00 | 24.00 | -- | 15.00 |
11024 | 55.00 | 25.00 | -- | 17.00 |
11021 | 40.00 | 25.00 | -- | 19.00 |
11018 | 19.85 | 20.73 | -- | 11.30 |
11016 | 19.00 | 17.00 | -- | 8.35 |
6596 | 17.40 | 19.00 | -- | 6.35 |
6594 | 11.00 | 15.00 | -- | 10.30 |
6582 | 14.40 | 9.20 | 5.00 | 9.40 |
6538 | 14.30 | 11.50 | -- | 10.00 |
6537 | 21.00 | 16.00 | -- | 7.50 |
6535 | 20.00 | 12.00 | -- | 7.50 |
6528 | 20.00 | 15.00 | -- | 15.00 |
6507 | 19.00 | 17.40 | -- | 6.35 |
6502 | 19.00 | 17.40 | -- | 6.35 |
6495 | 8.00 | 6.00 | -- | 3.25 |
6488 | 20.00 | 15.00 | -- | 7.50 |
6481 | 26.00 | 25.00 | -- | 7.20 |
6466 | 38.10 | 17.50 | -- | 9.50 |
6443 | 22.00 | 18.00 | -- | 6.00 |
6417 | 25.00 | 23.70 | -- | 13.00 |
6416 | 20.00 | 10.00 | -- | 9.40 |
6414 | 76.20 | 36.00 | 11.10 x 2 Plcs | 40.64 |
6390 | 100.00 | 35.00 | 14.00 x 2 Plcs | 72.00 |
6382 | 20.10 | 16.10 | -- | 9.70 |
6375 | 22.22 | 15.00 | -- | 12.20 |
6373 | 14.80 | 10.00 | -- | 11.60 |
6335 | 20.00 | 9.50 | -- | 8.90 |
6329 | 20.00 | 16.00 | -- | 10.40 |
6325 | 20.10 | 13.50 | -- | 15.50 |
6310 | 20.00 | 12.50 | -- | 10.00 |
6308 | 20.00 | 10.00 | -- | 10.00 |
6299 | 14.80 | 10.00 | -- | 11.60 |
6227 | 17.00 | 9.00 | -- | 13.00 |
6229 | 15.00 | 8.00 | -- | 16.00 |
6101 | 28.00 | 15.40 | -- | 12.30 |
5003 | 20.00 | 15.00 | -- | 11.00 |
5001 | 20.00 | 13.70 | -- | 5.70 |
3024 | 20.00 | 6.30 | -- | 15.00 |
2169 | 20.00 | 15.00 | -- | 7.50 |
2034 | 24.00 | 16.00 | -- | 12.00 |
D604 | 25.00 | 15.00 | -- | 5.00 |
D540 | 15.00 | 12.00 | -- | 7.20 |
D535 | 14.40 | 9.30 | 3.00 | 9.40 |
D357 | 15.40 | 12.00 | -- | 7.40 |
D323 | 22.22 | 22.22 | -- | 12.20 |
D246 | 10.00 | 14.30 | -- | 11.60 |
D234 | 91.90 | 47.60 | -- | 28.40 |
D225 | 18.00 | 20.00 | -- | 12.00 |
D142 | 25.00 | 22.50 | -- | 7.00 |
D112 | 14.40 | 14.40 | -- | 6.90 |
D088 | 10.00 | 15.00 | -- | 19.50 |
D062 | 19.00 | 11.40 | -- | 6.50 |
D058 | 12.00 | 15.10 | -- | 11.00 |
D052 | 15.60 | 15.60 | -- | 5.80 |
D039 | 36.00 | 28.00 | -- | 6.00 |
D025 | 16.50 | 7.60 | -- | 10.00 |
D024 | 16.50 | 5.40 | -- | 10.00 |
Custom Shapes Available
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With over six decades of expertise, PML delivers high-performance component technologies and precision solutions trusted across critical industries.
ISO 45001
Occupational Health and Safety (OH&S) management systems
ISO 4001
Environmental Management Systems (EMS)
ISO 9001
Quality Management Systems (QMS)
IATF 16949
International Standard for Automotive Management Systems
AS 9100
Aerospace Quality Management System (QMS)
An AlNiCo magnet is a permanent magnet made from aluminum, nickel, cobalt, and iron, known for its excellent temperature stability, strong magnetic performance, and durability in demanding industrial applications.
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Rely on PML Hastelloy C-22 superalloy for exceptional heat and corrosion resistance across demanding environments.
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Pioneering cutting-edge technology to develop reliable, high-performance magnetic components and engineering solutions.
