{"id":1698,"date":"2026-01-14T01:31:20","date_gmt":"2026-01-13T17:31:20","guid":{"rendered":"https:\/\/neosumk.com\/?p=1698"},"modified":"2026-02-13T18:55:43","modified_gmt":"2026-02-13T10:55:43","slug":"grades-of-magnets","status":"publish","type":"post","link":"https:\/\/ct.semitanker.com\/korea\/grades-of-magnets\/","title":{"rendered":"\uc790\uc11d \ub4f1\uae09"},"content":{"rendered":"

Magnets come in various grades, especially for neodymium magnets (NdFeB). The term \u201cmagnet grades\u201d typically refers to the material’s (BH)max or maximum energy product, which is a key value for comparing the strength of neodymium magnet grades. While magnet grades are a reliable indicator of material strength, they do not directly equate to pull force, as other factors such as geometry and surface conditions play a significant role.<\/p>\n\n\n\n

In practical applications, I use the grade as an initial filter, then refine the choice based on the magnet’s volume, air gap, coating thickness, and the steel surface\u2019s condition. A “high-grade” magnet may still underperform if the contact conditions differ from the test standards.<\/p>\n\n\n\n\n\n

Quick Answer: Magnet Grades Explained<\/h2>\n\n\n\n

Neodymium magnets (NdFeB) are graded by their (BH)max (maximum energy product, MGOe). Higher grades, such as N42 or N52<\/mark><\/a>, indicate stronger material, but actual pull force depends on factors like geometry, air gap, coating thickness, and the steel surface condition (e.g., flat, clean steel vs. thin or painted steel).<\/p>\n\n\n\n

If you see suffix letters like M \/ H \/ SH \/ UH \/ EH \/ AH<\/strong>, those are magnet temperature grades<\/strong>. They primarily increase resistance to irreversible demagnetization<\/strong> in hot environments. In my experience, temperature is the #1 reason a magnet that \u201cpassed bench tests\u201d later disappoints in real equipment\u2014especially near motors, enclosed housings, or anything that heat-soaks over time.<\/p>\n\n\n\n

What Are Magnet Grades?<\/h2>\n\n\n\n

Magnet grades are a standard way to describe the material performance level<\/strong> of a magnet. For neodymium magnets (NdFeB), grades are usually written as N<\/strong> + a two-digit number, sometimes with extra letters (for example: N42SH<\/strong>).<\/p>\n\n\n\n

A common misunderstanding: \u201cN\u201d is a naming convention used for NdFeB grades<\/strong> in the market (it\u2019s not a physics unit), and the number is tied to the magnet\u2019s (BH)max<\/strong> range, usually shown in MGOe<\/strong>. As a general rule, a higher number often means a stronger magnetic material for the same magnet volume<\/strong>, but each grade has an allowed range<\/strong>, not a single fixed value.<\/p>\n\n\n\n

From a sourcing\/testing angle, treat \u201cgrade\u201d like a material spec band\u2014then use real pull force tests (or FEA) for the final design decision.<\/p>\n\n\n\n

Neodymium Magnet Grades Chart<\/h2>\n\n\n\n
\ub4f1\uae09<\/th>Typical (BH)max Range (MGOe)<\/th>Typical Max Operating Temp (Standard)<\/th>Practical Selection Tip<\/th><\/tr><\/thead>
N35<\/strong><\/td>33\u201335<\/td>\u2264 80\u00b0C<\/td>Good baseline for general use<\/td><\/tr>
N42<\/strong><\/td>40\u201342<\/td>\u2264 80\u00b0C<\/td>Best balance for most designs<\/td><\/tr>
N45<\/strong><\/td>43\u201346<\/td>\u2264 80\u00b0C<\/td>More strength without jumping to N52<\/td><\/tr>
N52<\/strong><\/td>49\u201352<\/td>\u2264 80\u00b0C<\/td>Use when space is tight and max strength matters<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Real-world note:<\/strong> This chart compares neodymium magnet grades<\/strong> by their material strength. If your product operates above ~60\u201370\u00b0C, don\u2019t just upgrade to N52\u2014choose the appropriate magnet temperature grade<\/strong> (e.g., H\/SH\/UH\/EH\/AH) to prevent irreversible loss.<\/p>\n\n\n\n

\"N42<\/figure>\n\n\n\n

How to Choose the Right Neodymium Magnet Grade for Your Application<\/h2>\n\n\n\n

When selecting the right magnet grade, it\u2019s essential to match the grade to your application. For example, if space is tight, N52<\/strong> is the best choice as it provides maximum strength in a compact form. However, for general use, N35<\/strong> \ub610\ub294 N42<\/strong> may be more suitable. If high temperatures are involved, ensure to select a magnet temperature grade<\/strong> like N42H<\/strong> \ub610\ub294 N52H<\/strong>, which provides greater resistance to irreversible demagnetization.<\/p>\n\n\n\n

Your Application<\/strong><\/th>Recommended Magnet Grade<\/strong><\/th>\uc774\uc720<\/strong><\/th><\/tr><\/thead>
Standard use, no heat<\/td>N35, N42<\/td>Cost-effective, good strength-to-size ratio<\/td><\/tr>
Small space, high strength<\/td>N52<\/td>Maximizes strength in tight spaces<\/td><\/tr>
High heat environment<\/td>N42H, N52H<\/td>Temperature stability is critical<\/td><\/tr>
Moderate heat and space<\/td>N45, N50<\/td>Balanced strength and size for most applications<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\ub9cc\uc57d<\/strong> space is tight \u2192 choose N48\u2013N56<\/strong><\/p>\n\n\n\n

\ub9cc\uc57d<\/strong> air gap exists \u2192 reduce gap first \/ increase contact area<\/strong><\/p>\n\n\n\n

\ub9cc\uc57d<\/strong> temperature is uncertain \u2192 move up suffix grade first (M\/H\/SH\/UH\/EH\/AH)<\/strong> and test sample.<\/p>\n\n\n\n

How to Read a Neodymium Magnet Grades Chart<\/h2>\n\n\n\n

When you compare neodymium magnet grades (or any magnet grades chart<\/strong>), these three values matter most:<\/p>\n\n\n\n

1) (BH)max (Maximum Energy Product, MGOe)<\/strong><\/p>\n\n\n\n

This is the key value behind Nxx<\/strong> grades. Higher (BH)max generally means the NdFeB material can deliver more magnetic energy per unit volume<\/strong>.<\/p>\n\n\n\n

2) Br (Remanence, typically in Tesla or Gauss)<\/strong><\/p>\n\n\n\n

Br reflects how much magnetic flux density the material can produce at full magnetization. In practice, higher Br often correlates with stronger surface field trends (all else equal).<\/p>\n\n\n\n

3) Hcj (Intrinsic Coercivity, kOe or kA\/m)<\/strong><\/p>\n\n\n\n

Hcj shows resistance to demagnetization\u2014especially important with heat, vibration, and opposing magnetic fields<\/strong>. In real assemblies (motors, speakers, compact mechanisms), coercivity is often the hidden limiter, not the headline grade number.<\/p>\n\n\n\n

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Real-world tip: even a 0.2\u20131.0 mm air gap<\/strong> (paint, plating, tape, rubber pads<\/a>, coating build) can reduce pull force more than a few grade steps. This is why I usually solve \u201cnot strong enough\u201d by reducing gap or increasing contact area<\/strong> before paying for a higher grade.<\/p>\n<\/blockquote>\n\n\n\n

N45 vs N52: What\u2019s the Difference?<\/h2>\n\n\n\n

When comparing N45 and N52 magnets, the main difference is their (BH)max range. N45 typically ranges from 43\u201346 MGOe, while N52 ranges from 49\u201352 MGOe. N52 magnets tend to be stronger in the same size and shape, but a larger N45 magnet might outperform a smaller N52 if the volume is increased. Always consider magnet grades and the contact condition when making your final selection.<\/p>\n\n\n\n

In my experience, I only push to N52<\/a> when space is truly tight<\/strong> or when I can\u2019t change the geometry. If you can increase size slightly, an N45 magnet with more volume<\/strong> can outperform a small N52 (and it may be easier to source consistently in volume production).<\/p>\n\n\n\n

Practical buying tip: when comparing N45 vs N52, always look at your actual contact condition<\/strong>\u2014if you have paint, plating, rubber, or a small stand-off, your \u201cgain\u201d from N52 can be smaller than expected. (Related: n35 vs n52 magnet<\/a>, n45 vs n52 magnets<\/a>)<\/p>\n\n\n\n

\"\ucd5c\ub300<\/figure>\n\n\n\n

N50 vs N52 Magnets<\/h2>\n\n\n\n

\ub4f1\uae09 N50<\/strong> magnets are slightly lower in rated strength than N52<\/strong>, typically falling in the 47\u201351 MGOe<\/strong> range. In real production, the top end of N50 can overlap with the lower end of N52 because grades are ranges<\/strong>, not single numbers.<\/p>\n\n\n\n

If you need the most consistent \u201ctop performance\u201d within a compact design, N52 is usually the safer call. But in procurement, I\u2019ve also seen projects pick N50 when availability and cost are better\u2014then confirm performance with sample testing<\/strong> under the real air gap and steel condition.<\/p>\n\n\n\n

\"power<\/figure>\n\n\n\n

How Do Magnet Grades Affect Magnet Strength?<\/h2>\n\n\n\n

Magnet performance depends on several factors\u2014size, shape, air gap, coating thickness, and the steel surface<\/strong> the magnet contacts\u2014not just grade. Grade matters because it reflects the strength of the NdFeB material, but it does not automatically equal real holding force<\/strong> in your application.<\/p>\n\n\n\n

For two magnets with the same size and shape, different grades might show an improvement of roughly 10\u201320%<\/strong> under ideal pull-test conditions<\/strong> (clean, thick steel plate, near-zero air gap). In real assemblies, the performance gap often shrinks once you introduce paint, plating, rubber pads, rough surfaces, thin steel, or even a small stand-off<\/strong>.<\/p>\n\n\n\n

A practical engineering approach I use: if the design allows it, first try to reduce the air gap or increase contact area; only then upgrade the grade. This is also why a larger N45 can easily pull harder than a smaller N52.<\/p>\n\n\n\n

\uad00\ub828 \uae00: How strong are neodymium magnets<\/a><\/p>\n\n\n\n

\"different<\/figure>\n\n\n\n

Pull Force vs Shear Force (Why Your Magnet Slides)<\/strong><\/h2>\n\n\n\n
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  1. Pull Force vs Shear Force: Key Differences<\/strong>\n