What Does the “N” or Grade Mean on Neodymium Magnets?
Neodymium magnets are known as the most powerful permanent magnets available on the market. Their use has become widespread across many sectors, including electronics, automotive, medical, and aerospace industries. However, when purchasing or comparing these magnets, people often come across a letter followed by a number, like N35, N42, or N52SH. But what exactly do these symbols mean? Here’s a clear and concise explanation.
What Does the “N” Represent?
The letter “N” stands for “Neodymium.” It identifies the magnet as part of the rare-earth family, made primarily from neodymium, iron, and boron (NdFeB). All magnets in this category start with an “N” followed by a number that indicates their magnetic grade.
What Does the Number After the “N” Mean?
The number (such as 35, 42, or 52) represents the magnetic strength, or more precisely, the maximum energy product (BHmax) that the magnet can deliver. This is measured in Mega Gauss Oersteds (MGOe). The higher the number, the stronger the magnetic field the magnet can produce under optimal conditions.
For example:
- N35: standard strength magnet
- N42: stronger than N35
- N52: one of the highest grades commercially available
Is There a Visible Difference?
Yes. At the same size and shape, an N52 magnet is significantly stronger than an N35. This makes it possible to reduce magnet size while maintaining strength—an essential benefit in applications where space or weight is limited.
What About Letters Like “M”, “H”, “SH”, “UH”, or “EH”?
These letters indicate the thermal resistance of the magnet. Neodymium magnets can lose strength when exposed to high temperatures. That’s why special grades exist to withstand more heat.
- M: up to 100 °C
- H: up to 120 °C
- SH: up to 150 °C
- UH: up to 180 °C
- EH: up to 200 °C
- TH: up to 230 °C
For example, an N42SH has the same magnetic strength as a standard N42 but can handle higher temperatures without demagnetizing.
Conclusion
Understanding the “N” followed by a number and optional letters is crucial when selecting a neodymium magnet. It allows you to determine both the magnetic strength and temperature resistance needed for your specific application. Whether you’re working on a technical, industrial, or DIY project, decoding these labels helps you make informed, safe, and effective choices.
Need help choosing the right magnet? Reach out to a specialized supplier to ensure optimal performance tailored to your needs.
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