Magnetic field analysis supporting fuel-conditioning systems
GUK helped Magnatech review its magnetic system, model field penetration through fuel-feed pipes and strengthen its manufacturing and supply arrangements.
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Samarium Cobalt Magnets (SmCo)
SAMARIUM COBALT MAGNETS (SMCO) UK Supplier
GUK Magnetics supplies SmCo magnets made to specification, supporting industrial, technical and specialist applications where high temperature stability, corrosion resistance and long-term magnetic performance are critical.
What we support:
● Grade selection including SmCo5 and Sm2Co17
● High-temperature magnet requirements
● Magnetisation direction: axial, diametric, radial and custom
● Coatings and finishes for application-specific environments
● Geometry: disc, block, ring, rod, arc, segment, countersunk and custom
● Technical guidance on suitability, manufacturability and supply
Built for demanding environments:
Our experts help ensure Samarium Cobalt magnets are practical to produce, reliable in use, and aligned with your operating temperature, performance and environmental requirements.
From concept to production:
Whether you have a full drawing, an existing part, or a rough idea of magnet grade, dimensions and application conditions, we help define and deliver a production-ready SmCo solution.
SAMARIUM COBALT MAGNETS MANUFACTURED TO YOUR EXACT SPECIFICATIONS
Extensive range of grades & sizes
We provide a diverse selection of SmCo magnets available in various grades, shapes, and sizes - made to specification to meet your requirements.
ISO 9001 CERTIFIED
All SmCo magnets are supplied to controlled specifications and manufactured using approved processes, ensuring consistent quality and repeatable performance across production and repeat orders.
USED IN DEMANDING APPLICATIONS
SmCo magnets supplied by GUK are used in motors, sensors, aerospace systems, medical equipment, and high-temperature industrial applications where reliability and stability outweigh maximum magnetic strength.
PRACTICAL TECHNICAL SUPPORT
Our team provides technical advice on grade selection, temperature limits, magnetisation direction, and mechanical considerations - helping ensure SmCo is the right choice over alternative materials.
RELIABLE DELIVERY & SUPPLY
We focus on realistic lead times, clear delivery expectations, and dependable repeat supply - helping customers plan with confidence and avoid unexpected disruption.
CUSTOM MAGNET CONFIGURATIONS
Where standard formats are unsuitable, we support custom shapes, magnetisation patterns, and assemblies - supplying SmCo magnets tailored to specific application and installation requirements.
Samarium Cobalt Magnetic Grades
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Item | Grade | GBT 4180-2012 | Remanence | Coercivity | Max Energy Product | Max Working Temperature | Density | Temperature Coefficient of Br | Temperature Coefficient of Hcj | ||||||
| Br | Hcb | HcJ | (BH)max | Tw Max | P | a (Br) | a (Hcj) | ||||||||
| T | kGs | kA/m | kOe | kA/m | kOe | KJ/m³ | MGOe | °C | °C | % / °C | % / °C | ||||
| Sm1Co5 | Sm1Co5-16 | XG1S 135/96 | 0.79-0.84 | 7.9-8.4 | 620-660 | 7.8-8.3 | ≥1830 | ≥23 | 118-135 | 15-17 | ≤250 | 8.3 | -0.035 | -0.28 | |
| Sm1Co5-18 | XG1S 143/160 | 0.84-0.89 | 8.4-8.9 | 660-700 | 8.3-8.8 | ≥1830 | ≥23 | 135-151 | 17-19 | ≤250 | 8.3 | -0.04 | -0.28 | ||
| Sm1Co5-20 | XG1S 159/140 | 0.89-0.93 | 8.9-9.3 | 684-732 | 8.6-9.2 | ≥1830 | ≥23 | 150-167 | 19-21 | ≤250 | 8.3 | -0.045 | -0.28 | ||
| Sm1Co5-22 | XG1S 175/140 | 0.92-0.96 | 9.2-9.6 | 710-756 | 8.9-9.5 | ≥1830 | ≥23 | 167-183 | 21-23 | ≤250 | 8.3 | -0.045 | -0.28 | ||
| Sm1Co5-24 | / | 0.96-1.00 | 9.6-10.0 | 740-788 | 9.3-9.9 | ≥1830 | ≥23 | 183-199 | 23-25 | ≤250 | 8.3 | -0.045 | -0.28 | ||
| Sm2Co17 | Sm2Co17-24L | / | 0.95-1.02 | 9.5-10.2 | 541-716 | 6.8-9.0 | 636-955 | 8-12 | 175-191 | 22-24 | ≤250 | 8.4 | -0.025 | -0.28 | |
| Sm2Co17-26L | XGS 207/50 | 1.02-1.05 | 10.2-10.5 | 541-784 | 6.8-9.4 | 636-955 | 8-12 | 191-207 | 24-26 | ≤250 | 8.4 | -0.035 | -0.2 | ||
| Sm2Co17-28L | XGS 223/50 | 1.03-1.08 | 10.3-10.8 | 541-764 | 6.8.-9.6 | 636-955 | 8-12 | 207-220 | 26-28 | ≤250 | 8.4 | -0.035 | -0.2 | ||
| Sm2Co17-30L | / | 1.08-1.10 | 10.8-11.0 | 541-796 | 6.8-10.0 | 636-955 | 8-12 | 223-239 | 28-30 | ≤250 | 8.4 | -0.035 | -0.2 | ||
| Sm2Co17-32L | / | 1.10-1.15 | 11.0-11.5 | 541--812 | 6.8-10.2 | 636-955 | 8-12 | 231-255 | 29-32 | ≤250 | 8.4 | -0.035 | -0.2 | ||
| Sm2Co17-26M | XGS 207/80 | 1.02-1.05 | 10.2-10.5 | 676-780 | 8.5-9.8 | 955-1433 | 12-18 | 191-207 | 24-26 | ≤300 | 8.4 | -0.035 | -0.2 | ||
| Sm2Co17-28M | XGS 223/80 | 1.03-1.08 | 10.3-10.8 | 676-796 | 8.5-10.0 | 955-1433 | 12-18 | 207-220 | 26-28 | ≤300 | 8.4 | -0.035 | -0.2 | ||
| Sm2Co17-30M | XGS 239/80 | 1.08-1.10 | 10.8-11.0 | 676-835 | 8.5-10.5 | 955-1433 | 12-18 | 223-239 | 28-30 | ≤300 | 8.4 | -0.035 | -0.2 | ||
| Sm2Co17-32M | / | 1.10-1.15 | 11.0-11.5 | 676-852 | 8.5-10.7 | 955-1433 | 12-18 | 231-255 | 29-32 | ≤300 | 8.4 | -0.035 | -0.2 | ||
| Sm2Co17-33M | / | 1.13-1.15 | 11.3-11.5 | 820-870 | 10.3-10.9 | 955-1433 | 12-18 | 246-262 | 31-32 | ≤300 | 8.4 | -0.039 | -0.22 | ||
| Sm2Co17-22 | / | 0.93-0.97 | 9.3-9.7 | 676-740 | 8.5-9.3 | ≥1433 | ≥18 | 160-183 | 20-23 | ≤300 | 8.4 | -0.02 | -0.2 | ||
| Sm2Co17-24 | / | 0.95-1.02 | 9.5-10.2 | 692-764 | 8.7-9.6 | ≥1433 | ≥18 | 175-191 | 22-24 | ≤300 | 8.4 | -0.025 | -0.2 | ||
| Sm2Co17-26 | XGS 207/160 | 1.02-1.05 | 10.2-10.5 | 748-796 | 9.4-10.0 | ≥1433 | ≥18 | 191-207 | 24-26 | ≤300 | 8.4 | -0.03 | -0.2 | ||
| Sm2Co17-28 | XGS 223/160 | 1.03-1.08 | 10.3-10.8 | 756-812 | 9.5-10.2 | ≥1433 | ≥18 | 207-220 | 26-28 | ≤300 | 8.4 | -0.035 | -0.2 | ||
| Sm2Co17-30 | XGS 223/247 | 1.08-1.10 | 10.8-11.0 | 788-835 | 9.9-10.5 | ≥1433 | ≥18 | 220-240 | 28-30 | ≤300 | 8.4 | -0.035 | -0.2 | ||
| Sm2Co17-32 | / | 1.10-1.13 | 11.0-11.3 | 812-860 | 10.2-10.8 | ≥1433 | ≥18 | 230-255 | 29-32 | ≤300 | 8.4 | -0.035 | -0.2 | ||
| Sm2Co17-33 | / | 1.13-1.15 | 11.3-11.5 | 820-870 | 10.3-10.9 | ≥1433 | ≥18 | 246-262 | 31-32 | ≤300 | 8.4 | -0.039 | -0.22 | ||
| Sm2Co17-24H | XGS 191/200 | 0.95-1.02 | 9.5-10.2 | 692-764 | 8.7-9.6 | ≥1990 | ≥25 | 175-191 | 22-24 | ≤350 | 8.4 | -0.025 | -0.2 | ||
| Sm2Co17-26H | XGS 207/200 | 1.02-1.05 | 10.2-10.5 | 748-796 | 9.4-10.0 | ≥1990 | ≥25 | 191-207 | 24-26 | ≤350 | 8.4 | -0.03 | -0.2 | ||
| Sm2Co17-28H | XGS 223/200 | 1.03-1.08 | 10.3-10.8 | 756-812 | 9.5-10.2 | ≥1990 | ≥25 | 207-220 | 26-28 | ≤350 | 8.4 | -0.035 | -0.2 | ||
| Sm2Co17-30H | XGS 239/160 | 1.08-1.10 | 10.8-11.0 | 788-835 | 9.9-10.5 | ≥1990 | ≥25 | 223-239 | 28-30 | ≤350 | 8.4 | -0.035 | -0.2 | ||
| Sm2Co17-32H | / | 1.10-1.13 | 11.0-11.3 | 812--860 | 10.2-10.8 | ≥1990 | ≥25 | 230-255 | 29-32 | ≤350 | 8.4 | -0.035 | -0.2 | ||
| Sm2Co17-33H | / | 1.13-1.15 | 11.3-11.5 | 830-880 | 10.4-11 | ≥1990 | ≥25 | 246-262 | 31-32 | ≤350 | 8.4 | -0.039 | -0.22 | ||
| Sm2Co17-35H | / | 1.16-1.21 | 11.6-12.1 | ≥855 | ≥10.7 | ≥2000 | ≥25 | 255-279 | 32-35 | ≤200 | 8.4 | -0.039 | -0.25 | ||
| Sm2Co17-TR | Sm2Co17-20TR | / | 0.9-0.94 | 9.0-9.4 | 661-732 | 8.3-9.2 | ≥1592 | ≥20 | 143-159 | 18-20 | ≤500 | 8.4 | -0.035 | -0.15 | |
| Sm2Co17-TR | Sm2Co17-16LT | / | 0.81-0.85 | 8.1-8.5 | 605-669 | 7.6-8.4 | ≥1592 | ≥20 | 111-127 | 14-16 | ≤300 | 8.4 | Temperature range -50 oC -20 oC 20 oC -200 oC 200 oC -300 oC | Temperature Coefficient of Br +0.005%/ oC -0.008%/ oC -0.011%/ oC | |
| Sm2Co17-18LT | / | 0.85-0.9 | 8.5-9.0 | 629-708 | 7.9-8.9 | ≥1592 | ≥20 | 127-143 | 16-18 | ≤300 | 8.4 | ||||
| Sm2Co17-20LT | / | 0.9-0.94 | 9.0-9.4 | 661-732 | 8.3-9.2 | ≥1592 | ≥20 | 143-159 | 18-20 | ≤300 | 8.4 | ||||
| Sm2Co17-22LT | / | 0.94-0.97 | 9.4-9.7 | 685-740 | 8.6-9.3 | ≥1592 | ≥20 | 159-175 | 20-22 | ≤300 | 8.4 | ||||
Magnetic engineering in application
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Read case studyKey Considerations for SmCO Magnets
SmCo magnets are typically selected when applications involve either sustained operating temperatures above ~180–200 °C, chemically aggressive or corrosive environments, or tight magnetic stability requirements over temperature. If maximum magnetic strength is the priority, neodymium may be more suitable.
It is also important to note that SmCo magnets are hard and brittle. We provide guidance on handling, tolerances, edge conditions, and assembly integration to reduce risk during manufacture and installation, but care should be taken to avoid contact either in the application or in the assembly of the product it is used in.
FAQs
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