Magnets
AlNiCo 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-Temperature Stability, Corrosion Resistance & Complex Shape Casting
High-performance Aluminum-Nickel-Cobalt magnets offering excellent temperature stability, corrosion resistance, and precision-cast versatility for demanding aerospace, industrial, and medical applications.
AlNiCo Magnets by PML – 65 Years of Proven Performance
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.
Ingot Manufacturing Process
Melting of virgin elements to make ingots of IN625 alloy by Vacuum Induction melting (VIM)
Raw Material Weighing
High-purity raw materials are accurately weighed and prepared to achieve the desired AlNiCo alloy composition, ensuring consistency and performance.
Melting & Pouring
The charge is melted using advanced induction melting techniques and carefully poured into sand or shell molds to form the required shapes.
Cleaning
Post-casting, components undergo cleaning to remove surface impurities and residual materials, preparing them for further processing.
Heat Treatment
Cast magnets are subjected to controlled heat treatment, including heating above the Curie temperature, to develop optimal magnetic properties.
Magnetic Orientation (For Anisotropic Grades)
Directional magnetic properties are achieved by aligning the material during processing, enhancing performance in specific applications.
Temper Aging
Aging at controlled temperatures (around 600°C) improves coercivity and energy product, stabilizing the magnetic characteristics.
Grinding & Finishing
Precision grinding ensures tight dimensional tolerances and surface finish as per application requirements.
Magnetization (If Required)
Magnets are magnetized to specified levels depending on the end-use, ensuring readiness for application.
Testing & Packaging
Finished products are thoroughly inspected, securely packed, and dispatched as per customer specifications.
Key Properties & Advantages
High Thermal Stability
Operates effectively up to 540°C (1,004°F)
Corrosion Resistance
Naturally resistant to rust, suitable for harsh environments
Mechanical Integrity
Superior mechanical strength compared to other magnets
Strong Magnetic Output
High remanence and energy products in select grades
Material Specifications
Physical & Mechanical Properties
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
Magnetic Properties
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 |
Applications
1
Aerospace
Sensors, actuators, navigation systems
2
Automotive
Ignition systems, fuel gauges, speedometers
3
Electronics
Loudspeakers, microphones, magnetic pickups
4
Medical Devices
MRI components, surgical tools
5
Industrial Use
Magnetic chucks, separators, relay magnets
Typical Dimensions – AlNiCo Chuck 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 |
Magnet Types Offered
Custom Shapes Available
1
Round Bar Magnets
2
Button Magnets
3
U-Shaped Magnets
4
Relay Magnets
5
Ring Magnets
6
Curved Field Magnets
7
Rotor Magnets
8
Channel Bar Magnets
9
Speedometer Magnets
Trust Reliability & Quality
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)
Frequently Asked Questions
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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