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AlNiCo magnets combine excellent temperature stability, low reversible temperature coefficient and reliable long-term magnetic output. They are widely selected for precision sensors, meters, instruments, holding devices and magnetic assemblies operating in elevated-temperature environments.
Ningbo Vanguard Technologies supplies custom cast AlNiCo magnets in rods, cylinders, rings, blocks, horseshoe profiles and complex as-cast geometries. Grade, L/D ratio, magnetic circuit, machining allowance and magnetization are reviewed together to reduce demagnetization risk.
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Because AlNiCo has relatively low coercivity, short open-circuit magnets are more vulnerable to partial demagnetization. Longer geometries, steel keepers and closed return paths improve operating stability.
AlNiCo offers excellent high-temperature capability and low magnetic drift. Actual operating limits still depend on grade, geometry, load line and the surrounding assembly.
External reverse fields, incorrect assembly sequence and open-circuit storage can reduce output. Magnetization state and handling fixtures should be reviewed before production.
Casting supports larger and complex profiles, while grinding controls critical faces, diameters and assembly interfaces. Thin walls, small holes and sharp transitions need early review.
These are common cast AlNiCo grades and the values used on the original website page. Values are typical at 20 °C and may vary with manufacturer, process, heat treatment, orientation and final geometry.
| Material | Grade | Br (T) | Br (kGs) | Hcb (kA/m) | Hcb (kOe) | (BH)max (kJ/m³) | (BH)max (MGOe) | Max. Operating Temp. (°C) | Temp. Coeff. Br (%/°C) | Typical Use |
|---|---|---|---|---|---|---|---|---|---|---|
| Cast AlNiCo | AlNiCo 2 | 0.70-0.76 | 7.0-7.6 | 40-48 | 0.50-0.60 | 10-13 | 1.25-1.65 | 450 | -0.02 | General sensors, instruments |
| Cast AlNiCo | AlNiCo 3 | 0.55-0.65 | 5.5-6.5 | 38-44 | 0.48-0.55 | 4-6 | 0.5-0.8 | 450 | -0.02 | Low-cost stable-field devices |
| Cast AlNiCo | AlNiCo 5 | 1.20-1.30 | 12.0-13.0 | 46-54 | 0.58-0.68 | 40-44 | 5.0-5.5 | 525 | -0.02 | Meters, sensors, holding magnets |
| Cast AlNiCo | AlNiCo 6 | 1.05-1.15 | 10.5-11.5 | 58-66 | 0.73-0.83 | 28-34 | 3.5-4.3 | 525 | -0.02 | Higher coercivity than AlNiCo 5 |
| Cast AlNiCo | AlNiCo 8 | 0.75-0.85 | 7.5-8.5 | 120-140 | 1.50-1.76 | 32-44 | 4.0-5.5 | 550 | -0.02 | Higher demagnetization resistance |
| Cast AlNiCo | AlNiCo 9 | 1.05-1.15 | 10.5-11.5 | 110-130 | 1.38-1.63 | 72-80 | 9.0-10.0 | 550 | -0.02 | High-energy AlNiCo applications |
| Item | Available Options | Engineering Notes |
|---|---|---|
| Shape | Rod, bar, block, ring, disc, cylinder, horseshoe, U-shape, stepped and custom cast profile | Complex forms may be more practical by casting than machining from brittle stock. |
| Magnetization | Axial, diametrical, supported radial, multi-pole and custom fixture magnetization | Magnetization after final machining and assembly is preferred when the design allows. |
| Tolerance | As-cast tolerance, ground tolerance, precision grinding and critical-dimension inspection | Grinding controls tighter dimensions, flatness and functional interfaces. |
| Surface Finish | Ground, sand-blasted, polished, painted, plated, passivated or uncoated | Coating is commonly selected for appearance, identification, bonding or handling. |
| Assembly Support | Steel keeper, yoke, housing, adhesive bonding and magnetic circuit review | A suitable steel return path can improve field output and operating stability. |
| Inspection | Dimension, surface flux, magnetic moment, polarity and material documentation | The inspection plan is matched to the drawing and final application. |
Stable reference fields for position, speed and measurement devices where long-term consistency and low thermal drift matter.
Analog meters, scientific equipment and calibration assemblies requiring repeatable magnetic performance.
Magnetic components for hot industrial equipment, ovens and thermal-cycle environments after load-line verification.
Horseshoe magnets, keeper-style fixtures and selected speaker structures with an engineered steel return path.
Alloy composition, mold design, casting condition, heat treatment and magnetic orientation are controlled according to grade requirements.
Surface flux, magnetic moment, polarity, demagnetization response and batch consistency can be checked to the agreed plan.
Critical dimensions, flatness, roundness, hole position, grinding finish and visual defects are verified before shipment.
Material certificates, dimensional and magnetic reports, plus RoHS and REACH documentation, are available on request.
Choose AlNiCo when low magnetic drift, high-temperature stability and good corrosion resistance are more important than compact size or very high coercivity. The magnetic circuit must protect the magnet from reverse fields.
AlNiCo has relatively low coercivity. A short magnet has a steeper self-demagnetizing field and may operate below a stable point. A longer geometry or closed steel circuit generally improves the load line.
Yes. Grinding and selected cutting operations are used for critical dimensions, but AlNiCo is hard and brittle. Holes, thin walls and sharp details should be reviewed before tooling.
They are often supplied uncoated because the alloy has good corrosion resistance. Paint, plating or passivation may be added for appearance, identification, bonding or a specific environment.
Please provide a 2D drawing or 3D model, grade or operating temperature, dimensions and tolerances, magnetization direction, magnetic circuit, finish, sample quantity and annual demand.
Send your drawing, operating temperature, magnetic target and assembly information. Our engineering team will review grade, geometry, machining, magnetization and inspection requirements before quotation.
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