Custom SmCo Magnets
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Custom SmCo magnets are high-performance samarium cobalt permanent magnets manufactured according to specific drawings, magnetic requirements and operating environments. They are selected when a project requires excellent high-temperature stability, strong corrosion resistance, low magnetic drift and reliable performance under vibration, vacuum, chemical exposure or long service life conditions.
Compared with NdFeB magnets, SmCo magnets usually offer lower maximum energy product at room temperature, but they provide much better thermal stability and resistance to demagnetization. This makes custom SmCo magnets ideal for aerospace, automotive sensors, downhole tools, medical devices, high-temperature motors, precision instruments and magnetic coupling systems.
Ningbo Vanguard Technologies supplies custom SmCo magnets in SmCo 1:5 and SmCo 2:17 grade families. Shapes, dimensions, tolerances, magnetization direction, coating, magnetic sorting and inspection documents can be customized according to your application. Prototype samples can usually be prepared within 10-15 days after grade, drawing and magnetization are confirmed.
Standard grades for custom SmCo magnets. All values at 20 °C. Values are typical; exact grade selection is confirmed per application temperature, magnetic circuit, demagnetizing field, and assembly requirements.
| Material | Grade | Remanence | Coercivity | Intrinsic Coercivity | Max. Energy Product | Curie Temp. | Max. Ope. Tem. | Temp. Coeff. of Br | Temp. Coeff. of Hcj | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Br | Hcb | Hcj | (BH)max | Tc | Tw | ||||||||
| T | kGs | kA/m | kOe | kA/m | kOe | kJ/m³ | MGOe | (°C) | (°C) | (%/°C) | (%/°C) | ||
| SmCo5 | SmCo5-16S | 0.79–0.84 | 7.9–8.4 | 620–660 | 7.8–8.3 | ≥1830 | ≥23.0 | 118–135 | 15–17 | 750 | 250 | −0.035 | −0.28 |
| SmCo5-18S | 0.84–0.89 | 8.4–8.9 | 660–700 | 8.3–8.8 | ≥1830 | ≥23.0 | 135–151 | 17–19 | 750 | 250 | −0.040 | −0.28 | |
| SmCo5-20S | 0.89–0.93 | 8.9–9.3 | 684–732 | 8.6–9.2 | ≥1830 | ≥23.0 | 150–167 | 19–21 | 750 | 250 | −0.045 | −0.28 | |
| SmCo5-22S | 0.92–0.96 | 9.2–9.6 | 710–756 | 8.9–9.5 | ≥1830 | ≥23.0 | 167–183 | 21–23 | 750 | 250 | −0.045 | −0.28 | |
| SmCo5-24S | 0.96–1.00 | 9.6–10.0 | 740–788 | 9.3–9.9 | ≥1830 | ≥23.0 | 183–199 | 23–25 | 750 | 250 | −0.045 | −0.28 | |
| LTC(SmCo5-10) | 0.62–0.66 | 6.2–6.6 | 485–517 | 6.1–6.5 | ≥1830 | ≥23.0 | 75–88 | 9.5–11.0 | 750 | 300 | 20–100 °C | +0.0156%/°C | |
| 100–200 °C | +0.0087%/°C | ||||||||||||
| 200–300 °C | +0.0007%/°C | ||||||||||||
| Sm2Co17 | Sm2Co17-24H | 0.95–1.02 | 9.5–10.2 | 692–764 | 8.7–9.6 | ≥1990 | ≥25.0 | 175–191 | 22–24 | 800 | 350 | −0.025 | −0.20 |
| Sm2Co17-26H | 1.02–1.05 | 10.2–10.5 | 740–788 | 9.4–10.0 | ≥1990 | ≥25.0 | 191–207 | 24–26 | 800 | 350 | −0.030 | −0.20 | |
| Sm2Co17-28H | 1.03–1.08 | 10.3–10.8 | 756–812 | 9.5–10.2 | ≥1990 | ≥25.0 | 207–220 | 26–28 | 800 | 350 | −0.035 | −0.20 | |
| Sm2Co17-30H | 1.08–1.10 | 10.8–11.0 | 788–835 | 9.9–10.5 | ≥1990 | ≥25.0 | 220–240 | 28–30 | 800 | 350 | −0.035 | −0.20 | |
| Sm2Co17-32H | 1.10–1.13 | 11.0–11.3 | 812–860 | 10.2–10.8 | ≥1990 | ≥25.0 | 230–255 | 29–32 | 800 | 350 | −0.035 | −0.20 | |
| Sm2Co17-22 | 0.93–0.97 | 9.3–9.7 | 676–740 | 8.5–9.3 | ≥1433 | ≥18.0 | 160–183 | 20–23 | 800 | 300 | −0.020 | −0.20 | |
| Sm2Co17-24 | 0.95–1.02 | 9.5–10.2 | 692–764 | 8.7–9.6 | ≥1433 | ≥18.0 | 175–191 | 22–24 | 800 | 300 | −0.025 | −0.20 | |
| Sm2Co17-26 | 1.02–1.05 | 10.2–10.5 | 748–796 | 9.4–10.0 | ≥1433 | ≥18.0 | 191–207 | 24–26 | 800 | 300 | −0.030 | −0.20 | |
| Sm2Co17-28 | 1.03–1.08 | 10.3–10.8 | 756–812 | 9.5–10.2 | ≥1433 | ≥18.0 | 207–220 | 26–28 | 800 | 300 | −0.035 | −0.20 | |
| Sm2Co17-30 | 1.08–1.10 | 10.8–11.0 | 788–835 | 9.9–10.5 | ≥1433 | ≥18.0 | 220–240 | 28–30 | 800 | 300 | −0.035 | −0.20 | |
| Sm2Co17-32 | 1.10–1.13 | 11.0–11.3 | 812–860 | 10.2–10.8 | ≥1433 | ≥18.0 | 230–255 | 29–32 | 800 | 300 | −0.035 | −0.20 | |
| Sm2Co17-26M | 1.02–1.05 | 10.2–10.5 | 676–780 | 8.5–9.8 | 955–1433 | 12–18 | 191–207 | 24–26 | 800 | 300 | −0.035 | −0.20 | |
| Sm2Co17-28M | 1.03–1.08 | 10.3–10.8 | 676–796 | 8.5–10.0 | 955–1433 | 12–18 | 207–220 | 26–28 | 800 | 300 | −0.035 | −0.20 | |
| Sm2Co17-30M | 1.08–1.10 | 10.8–11.0 | 676–835 | 8.5–10.5 | 955–1433 | 12–18 | 220–240 | 28–30 | 800 | 300 | −0.035 | −0.20 | |
| Sm2Co17-32M | 1.10–1.13 | 11.0–11.3 | 676–852 | 8.5–10.7 | 955–1433 | 12–18 | 230–255 | 29–32 | 800 | 300 | −0.035 | −0.20 | |
| Sm2Co17-24L | 0.95–1.02 | 9.5–10.2 | 541–716 | 6.8–9.0 | 636–955 | 8–12 | 175–191 | 22–24 | 800 | 250 | −0.025 | −0.20 | |
| Sm2Co17-26L | 1.02–1.05 | 10.2–10.5 | 541–748 | 6.8–9.4 | 636–955 | 8–12 | 191–207 | 24–26 | 800 | 250 | −0.035 | −0.20 | |
| Sm2Co17-28L | 1.03–1.08 | 10.3–10.8 | 541–764 | 6.8–9.6 | 636–955 | 8–12 | 207–220 | 26–28 | 800 | 250 | −0.035 | −0.20 | |
| Sm2Co17-30L | 1.08–1.15 | 10.8–11.5 | 541–796 | 6.8–10.0 | 636–955 | 8–12 | 220–240 | 28–30 | 800 | 250 | −0.035 | −0.20 | |
| Sm2Co17-32L | 1.10–1.15 | 11.0–11.5 | 541–812 | 6.9–10.2 | 636–955 | 8–12 | 230–255 | 29–32 | 800 | 250 | −0.035 | −0.20 | |
| LTC(Sm2Co17-18) | 0.85–0.90 | 8.5–9.0 | 629–708 | 7.9–8.9 | ≥1433 | ≥18 | 135–151 | 17–19 | 840 | 300 | −0.001 | −0.25 | |
| LTC(Sm2Co17-20) | 0.90–0.94 | 9.0–9.4 | 661–732 | 8.3–9.2 | ≥1433 | ≥18 | 151–167 | 19–21 | 840 | 300 | −0.007 | −0.25 | |
| LTC(Sm2Co17-22) | 0.94–0.97 | 9.4–9.7 | 685–740 | 8.6–9.3 | ≥1433 | ≥18 | 167–183 | 21–23 | 840 | 300 | −0.010 | −0.25 | |
| LTC(Sm2Co17-24) | 0.98–1.02 | 9.8–10.2 | 724–772 | 9.1–9.7 | ≥1433 | ≥18 | 183–199 | 23–25 | 840 | 300 | −0.012 | −0.25 | |
| Parameters | Unit | SmCo5 | Sm2Co17 |
|---|---|---|---|
| Density / ρ | g/cm³ | 8.2–8.4 | 8.3–8.5 |
| Vickers Hardness / HV | – | 450–500 | 550–600 |
| Compressive Strength | MPa | 1000 | 800 |
| Bending Strength / σ | MPa | 150–180 | 130–150 |
| Tensile Strength / σ | MPa | 400 | 350 |
| Electrical Resistivity / ρ | Ω·cm | (5–6) × 10−5 | (8–9) × 10−5 |
| Coefficient of Thermal Expansion / α C⊥ | 10−6/K | C⊥: 12 | C⊥: 11 |
| C∥: 6 | C∥: 8 |
Custom SmCo magnets can be supplied with axial, diametrical, radial, paired-pole, multi-pole or special fixture magnetization depending on the geometry and magnetic circuit. Magnetization direction, pole marking and test method should be confirmed before sampling.
SmCo magnets inherently offer excellent corrosion resistance because of their low iron content. Many applications use uncoated SmCo, while nickel, epoxy, parylene or other surface treatments can be selected for clean handling, bonding, humidity, salt spray or special assembly requirements.
Custom SmCo magnets can be manufactured as blocks, discs, cylinders, rings, arcs, segments, stepped parts and precision-ground profiles. Standard tolerance is typically ± 0.05 mm; tighter tolerance, matched height, flux grouping and special inspection can be discussed according to drawing and application risk.
| Geometry | Common Controls | Typical Applications |
|---|---|---|
| Block / Disc / Cylinder | Length, width, diameter, thickness, chamfer, flatness | Sensors, actuators, fixtures, instruments |
| Ring / Arc / Segment | OD, ID, radius, angle, wall thickness, concentricity | Motors, couplings, bearings, rotor assemblies |
| Special Profile | Step, slot, hole, paired set, magnetic sorting | Aerospace, downhole tools, medical and custom systems |
Custom SmCo magnets are produced through alloy preparation, powder milling, magnetic-field pressing, vacuum sintering, aging heat treatment, precision grinding or EDM, optional coating, magnetization and final inspection. Process control focuses on magnetic stability, dimensional accuracy and reliable assembly fit.
For faster engineering review, please provide drawing or 3D file, grade or working temperature, dimensions and tolerance, magnetization direction, coating requirement, operating environment, sample quantity and annual volume. If the grade is not fixed, our team can recommend a SmCo5 or Sm2Co17 option based on temperature and required magnetic output.
