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High Temperature and Heat Resistant Magnets
Every magnet loses some strength as it heats up, and above its maximum operating temperature part of that loss is permanent. The magnets in this range are made for hotter jobs, such as motors, sensors and machinery that runs warm: high temperature neodymium grades, samarium cobalt and ferrite. Each product page lists its maximum temperature. Choose from the stock sizes below. If you can’t see the grade or size you require, get in touch for a custom manufacturing quote.
High Temperature and Heat Resistant Magnets
High Temperature and Heat Resistant Magnets
Every magnet loses some strength as it heats up, and above its maximum operating temperature part of that loss is permanent. The magnets in this range are made for hotter jobs, such as motors, sensors and machinery that runs warm: high temperature neodymium grades, samarium cobalt and ferrite. Each product page lists its maximum temperature. Choose from the stock sizes below. If you can’t see the grade or size you require, get in touch for a custom manufacturing quote.
Showing 49–52 of 52 resultsSorted by price: low to high
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16mm x 10mm PTFE Coated Neodymium Disc Magnet N54SH – Max Temp 150°C (11.69KG Pull)
From £34.00 (£28.33 ex VAT) -
27mm x 4mm PTFE Coated Neodymium Disc Magnet N54H – Max Temp 120° (10.89KG Pull)
From £36.47 (£30.39 ex VAT) -
20mm x 10mm x (5.2mm Countersunk Hole) Samarium Cobalt Disc Magnet Sm2Co17 – Max Temp 350°C (2.0KG Pull)
From £42.72 (£35.60 ex VAT) -
OD49mm x ID43mm x Thickness 2.15mm Neodymium Arc Full Assembly Magnet N45H – Max Temp 120°C
£136.72 (£113.93 ex VAT)
High Temperature Magnet Grades
| Material | Grades in this range | Maximum operating temperature |
|---|---|---|
| Neodymium, M | N50M | 100°C |
| Neodymium, H | N35H, N45H, N54H | 120°C |
| Neodymium, SH | N45SH, N52SH, N54SH | 150°C |
| Neodymium, UH | N45UH, N50UH | 180°C |
| Neodymium, EH | N40EH, N48EH | 200°C |
| Ferrite | Y25, Y30, Y35 | 250°C |
| Samarium cobalt | Sm2Co17 | 350°C |
Full figures for every grade are in our neodymium magnet grades guide, samarium cobalt magnet grades guide and ferrite magnet grades guide.
High Temperature Magnets FAQs
Do magnets lose strength when they get hot?
Yes.
Up to its maximum operating temperature, a magnet loses a little strength while it is hot and gets it back as it cools. Above that temperature some of the loss is permanent, and much hotter still the magnet is demagnetised for good. That is why the grade matters when a magnet runs hot.
To see how heat affects a particular magnet, use our free MagNet calculator: with a free account you can adjust for temperature and check the demagnetisation risk.
How do I choose a magnet grade for high temperatures?
Start with the highest temperature the magnet will reach in use, then choose a grade rated above it from the table above.
Neodymium grades carry letters after the number that show their temperature rating: M, H, SH, UH and EH, in rising order. Our neodymium magnet grades guide gives the maximum operating temperature of every grade.
What do the number and letters in a neodymium grade mean?
The number is the grade’s strength, its maximum energy product in MGOe, so N52 is stronger than N42.
The letters show how well the magnet resists demagnetisation, including from heat. A grade with no letters has the standard rating. Our neodymium magnet grades guide explains both.
When should I use samarium cobalt instead of neodymium?
When your application runs hotter than the neodymium grades allow.
Samarium cobalt is the second strongest permanent magnet material after neodymium, so expect less strength than from a neodymium magnet of the same size. Our samarium cobalt magnet grades guide compares its two types.
Is the maximum temperature a fixed limit?
No. The figure on each product page is the rating for its grade.
How well a particular magnet copes with heat also depends on its shape: a thin magnet magnetised through its thickness is easier to demagnetise than a long one magnetised along its length. The demagnetisation risk in MagNet shows the effect for your magnet. If your application runs close to the limit, tell us the operating conditions and we will advise.
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