Heat-resistant magnets
Do you need magnets that can withstand extreme conditions? In this category, you will find temperature-resistant magnets that work flawlessly even at high temperatures. We offer magnets with resistance up to 300°C, ideal for industrial use, furnaces, engines, or other applications requiring high thermal stability.
Product sorting
Brands
According to the shape
Material
Tearing force range (kg)
Temperature resistance range
List of products
1Measure the temperature at the magnet
What decides the choice is the temperature at the magnet under continuous operation, not the temperature of the room. Inside a machine housing, next to a motor, in an engine bay or above a heat source, it is routinely far higher than people expect.
If you cannot measure it, estimate on the high side. Choosing one class too low causes a permanent loss; choosing one class too high costs only a little more.
2Match the material to the figure
| Temperature | Suitable material | What it costs you |
|---|---|---|
| up to 80 °C | standard neodymium, grade N | nothing, this is the cheapest strong magnet |
| 80 to 200 °C | neodymium grades M, H, SH, UH, EH | higher price, slightly lower force per size |
| 150 to 350 °C | ferrite | much lower force, but the cheapest option by far |
| 200 to 350 °C | samarium, SmCo | the highest price of all three materials |
Where the bands overlap, the decision is commercial rather than technical: ferrite if a larger magnet is acceptable, samarium if the force has to stay high in a small body.
3Read the grade letters on neodymium
With neodymium, the letter after the grade number is the temperature class: N up to about 80 °C, M to 100 °C, H to 120 °C, SH to 150 °C, UH to 180 °C and EH to 200 °C. A product named VMM7UH therefore works to roughly 180 °C, and the exact maximum working temperature is listed in the parameters of every item.
4Understand what overheating actually does
Below the stated maximum, a magnet gives up a little force while it is hot and recovers it on cooling. Above the maximum, the loss is permanent and the magnet never returns to its original strength, even back at room temperature.
This is why a machine that has been running for a few weeks sometimes seems to have quietly weakened: the magnet was one class too low and lost force on the very first hot cycle.
5Do not overheat the magnet while fitting it
Welding, grinding, soldering and drilling near a mounted magnet can push it past its limit within seconds, and the damage is the same as if the machine had overheated in service. Carry out all hot work first and fit the magnet afterwards.
Match the adhesive to the magnet as well. Bonding a 200 °C magnet with an epoxy that softens at 120 °C is a common failure, and it looks like a magnet problem when the part comes loose.
6Check the environment as well as the heat
Heat and damp together attack the plating on a neodymium magnet, and once the coating is compromised corrosion follows. Ferrite and samarium are naturally corrosion resistant and are supplied bare, with nothing on the surface that can fail.
Tip: Tell us the working temperature, the required holding force and the space available, and we will name the material. We stock all three, so the recommendation is not driven by what we happen to have on the shelf, and a cheap ferrite magnet is often the right answer to a hot problem.
Related categories to the Heat-resistant magnets category
- Samarium magnets
- Ferrite magnets
- Neodymium magnets
- Neodymium by temperature
- Ferrite by temperature
- Neodymium 81 to 120 °C
- Neodymium 121 to 150 °C
- Neodymium 151 to 200 °C
- Neodymium 201 to 350 °C
- Ferrite 151 to 200 °C
- Ferrite 201 to 350 °C
- SmCo cylinders
- SmCo blocks
- SmCo rings
- Neodymium blocks by temperature
- Neodymium cylinders by temperature
- Segments by temperature
- Atypical magnets by temperature
- Selection by pull force
- All magnets
Frequently asked questions about heat-resistant magnets
Samarium and ferrite both reach the 201 to 350 °C band. Samarium keeps a high force there, which is why it is used in motors, sensors and instruments; ferrite holds far less but costs a fraction as much, so it wins wherever a larger magnet is acceptable. Neodymium stops at about 200 °C even in its highest grades.
They are the temperature classes of neodymium. N works up to roughly 80 °C, M to 100 °C, H to 120 °C, SH to 150 °C, UH to 180 °C and EH to 200 °C. The letter appears after the grade in the product name, so a magnet described as VMM7UH is rated to about 180 °C. The exact figure is in the parameters of every product.
Below its rated maximum a magnet loses a little force while hot and recovers on cooling. Above it, the loss is permanent and does not return at room temperature. A magnet one class too low therefore weakens on the very first hot cycle, which is why an assembly can seem to have quietly deteriorated after a few weeks in service.
Generally yes. Within neodymium, the higher temperature classes give a somewhat lower pull force for the same size, because the material is formulated for thermal stability rather than maximum energy. Between materials the difference is much larger: a ferrite magnet needs to be considerably bigger than a neodymium one for the same hold.
Easily. Welding, grinding, soldering or drilling near a mounted magnet can exceed its limit within seconds, with the same permanent loss as overheating in service. Do all hot work before the magnet goes in, and choose an adhesive rated for the same temperature as the magnet, since a softening epoxy is a common cause of failures blamed on the magnet.
Heat is the parameter that most often decides whether a magnet survives its application, so we state the maximum working temperature for every product and stock all three materials that can handle it: neodymium in grades up to 200 °C, ferrite from 151 °C into the 201 to 350 °C band, and samarium around 300 °C. Because we sell all of them, we can tell you when a cheap ferrite magnet solves a hot problem that looked like a job for an expensive one.
