Neodymium Magnet Grades Explained (N35–N52)

Neodymium magnets (NdFeB) are classified by grade, such as N35, N42 or N52. These grades indicate the magnetic energy product of the material and help determine overall magnetic strength.

Understanding magnet grades allows you to select the most appropriate and cost-effective solution for your application.

What Does the “N” Rating Mean?

The “N” number represents the maximum energy product (BHmax) of the magnet material, measured in Mega Gauss Oersteds (MGOe). In simple terms, a higher number generally means stronger magnetic performance.

• N35 – Standard strength, cost-effective
• N42 – Higher performance, common industrial grade
• N52 – Very high strength, maximum energy density

Is N52 Always Better?

Not necessarily. While N52 offers greater magnetic strength, it may not be required for every application. Higher grades can be more expensive and may not provide additional benefit if the magnetic circuit or steel surface limits overall holding force.

Choosing the correct grade depends on application requirements, air gap, surface contact and mechanical design.

Temperature Ratings Matter

Standard neodymium magnets typically operate safely up to 80°C. For higher temperature environments, specialized grades such as “H”, “SH” or “UH” are available.

Exceeding maximum operating temperature can permanently reduce magnetic strength.

Pull Force vs. Magnet Grade

Magnet grade influences potential strength, but real-world pull force depends on:

• Magnet size and thickness
• Surface contact area
• Air gap
• Steel thickness and composition
• Mounting orientation

Published pull force values are measured under ideal laboratory conditions. Actual performance may vary.

Which Grade Should You Choose?

For most industrial holding applications, grades between N35 and N42 provide excellent performance. Higher grades such as N52 are typically used when space constraints require maximum strength in the smallest possible magnet.

If you are unsure which grade is appropriate, our team can assist you in selecting the right neodymium magnet for your application.

Explore Our Neodymium Magnet Range

View our complete selection of Industrial Neodymium Magnets in Canada, including disc, countersunk, pot and rectangular formats.