Magnet Grades Guide Pull Force Gauss Strength and N Numbers

What Are Magnet Grades

Magnet grades are a way to classify the strength and material properties of permanent magnets. For example, common neodymium magnet grades include N35, N42, and N52, where the “N” stands for neodüümi, and the number represents the magnet’s maximum energy product (BHmax) — a measure of how much magnetic energy the material can store. In general, higher numbers mean stronger magnets, assuming the same size and shape.

The grade not only reflects magnetiline tugevus but also materjali koostis and performance characteristics, including temperature tolerance and resistance to demagnetization.

Here’s a quick overview of popular magnet types and their typical grades:

• Neodüma (NdFeB) – The strongest commercially available permanent magnets; grades typically range from N35 to N52.
• Ferriit (Savinik) – Cost-effective and corrosion-resistant; grades such as C5 or C8.
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• Sammarium-kobalt (SmCo) cURL Too many subrequests by single Worker invocation. To configure this limit, refer to https://developers.cloudflare.com/workers/wrangler/configuration/#limits cURL Too many subrequests by single Worker invocation. To configure this limit, refer to https://developers.cloudflare.com/workers/wrangler/configuration/#limits.

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Understanding Pull Force What It Means and Why It Matters

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Gauss Magnet Strength The Magnetic Field Measurement

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• Residual Flux Density (Br) – the maximum magnetic energy the material can hold, measured in kilogauss (kG) or tesla (T) in a lab setting.

Surface gauss is what you’ll see in real-world readings, while Br is a material property used for comparing grades during manufacturing.

Why Gauss Matters

Gauss readings help you:

• Compare magnet strength before purchase
• Match the right magnet to your application
• Estimate holding force along with size and grade

This is especially important for industrial uses, electronics, motors, and magnetic sensors where field strength directly impacts performance.

Typical Surface Gauss by Magnet Type

*Surface gauss varies by size, shape, and pole arrangement.

Decoding N Numbers What They Signify

When you shop for neodymium magnets, you’ll often see grades like N35, N42, N52. These N numbers tell you how strong the magnet material is. The “N” stands for neodymium, and the number refers to the maksimaalne energiavahe (BHmax) — basically, how much magnetic energy the material can store. Higher numbers mean stronger potential pull, assuming the same size and shape.

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• N35 is a more cost-effective grade for general use.
• N42 offers balanced strength and price.
• N52 is one of the strongest grades in standard production — ideal for when you need max strength in a small space.

The N number also influences performance:

• Pull Power – Higher N grades deliver stronger pull forces for the same magnet size.
• Temperatuuri vastupidavus – Standard N magnets start losing strength above 80°C (176°F). For higher heat, you need special high-temp grades like N42SH or N35EH.
• Kestvus – The coating (nickel, epoxy, etc.) protects against corrosion, not the N grade itself — but higher-grade magnets should still be handled carefully because they are brittle.

Here’s a quick look at common N grades and what they mean:

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How Magnet Grade Impacts Performance Real World Applications

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• Magnetväljad eraldajad cURL Too many subrequests by single Worker invocation. To configure this limit, refer to https://developers.cloudflare.com/workers/wrangler/configuration/#limits cURL Too many subrequests by single Worker invocation. To configure this limit, refer to https://developers.cloudflare.com/workers/wrangler/configuration/#limits cURL Too many subrequests by single Worker invocation. To configure this limit, refer to https://developers.cloudflare.com/workers/wrangler/configuration/#limits
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Matching the magnet grade to the application is key. A higher N number isn’t always better—too strong can cause handling issues, pull in unwanted items, or even damage equipment. The right grade balances pull force, gauss strength, temperature resistance, and cost for the job at hand.

Other Factors Affecting Magnet Strength and Performance

Magnet grade and type matter, but they’re only part of the story. A few other factors play a big role in how strong a magnet will actually be in real-world use.

1. Size and Shape

• Bigger magnets generally have more pull force because they have more material producing the field.
• Shape affects how the field is distributed. For example, a thin disc won’t pull the same way as a thick block, even if they’re the same grade.

2. Coating

• Coatings (like nickel, epoxy, or rubber) protect magnets from rust and physical wear, especially neodymium which can corrode easily.
• While the coating doesn’t increase magnetic strength, it can help maintain performance over time by preventing damage.

3. Temperature Ratings

• Every magnet has a maximum operating temperature. When it gets too hot, it can lose strength—sometimes permanently.
• Higher grades don’t always mean higher heat resistance. For example, standard N neodymium grades start losing power at around 80°C (176°F), but high-temp grades like N35SH can handle up to 150°C (302°F).

4. Environmental Conditions and Demagnetization Risks

• Strong opposing magnetic fields, heat, or heavy mechanical stress can cause a magnet to lose some or all of its magnetism.
• For outdoor use or exposure to moisture, weatherproof coatings or corrosion-resistant materials like samarium cobalt are better choices.

Keeping these factors in mind when selecting a magnet can save you from buying the wrong type for your project—whether it’s for industrial machinery, hobby builds, or custom fixtures.

Why Choose NBAEM Quality Magnetic Materials and Expert Guidance

When you’re dealing with magnets, the right grade, pull force, and gauss rating make all the difference. NBAEM offers a full range of magnetic materials – from neodymium (N35–N52) to ferrite, alnico, and samarium cobalt, in various shapes, sizes, and coatings to suit different applications.

Wide Product Range by Grade and Type

We stock magnets for light-duty consumer products all the way to heavy-duty industrial and engineering use. Options include:

• Neodümiummagnetid – high pull force, compact size
• Ferriitmagnetid – cost-effective, corrosion-resistant
• Alnico magnetid – excellent temperature stability
• Samarium cobalt – high strength, extreme temperature resistance

Quality Control and Customization

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Expert Guidance for Choosing the Right Magnet

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Frequently Asked Questions FAQs

What does an N number indicate about strength

The N number cURL Too many subrequests by single Worker invocation. To configure this limit, refer to https://developers.cloudflare.com/workers/wrangler/configuration/#limitsBHmaxcURL Too many subrequests by single Worker invocation. To configure this limit, refer to https://developers.cloudflare.com/workers/wrangler/configuration/#limits N35 cURL Too many subrequests by single Worker invocation. To configure this limit, refer to https://developers.cloudflare.com/workers/wrangler/configuration/#limits N52 cURL Too many subrequests by single Worker invocation. To configure this limit, refer to https://developers.cloudflare.com/workers/wrangler/configuration/#limits

Relationship between pull force magnet size and grade

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Using gauss measurement to compare magnets

Gauss measures magnetic field strength at the surface. A gauss meter gives a direct reading you can use for comparisons. Just note:

• Higher grades usually show higher surface gauss on the same size magnet.
• Shape, coating, and measurement distance affect readings.
  If you’re comparing magnets for a project, measure them the same way for accurate results.

Impact of temperature and coating on magnet performance

Heat and environment can change a magnet’s performance:

• Many high grades like N52 lose strength faster under high temperatures.
• For higher heat resistance, look for special grades (e.g., N42SH or N35EH).
• Katvused like nickel-copper-nickel or epoxy protect against rust and chipping, especially in outdoor or humid settings.
  Choosing the right temperature rating and coating extends magnet life and keeps performance stable.