Which grade of Neodymium magnets has the strongest magnetism?

Currently, most magnet manufacturers can produce N52 magnets. The theoretical BH maximum of NdFeB magnets is 512KJ/m3 (64mgoe) and the maximum BH of N52 has reached 90% of the theoretical limit. However, the question in many users' minds is, is there a stronger level than N52 magnet? Of course there is!

Neodymium Magnet

What does N stand for in Neodymium magnet?

In neodymium magnet, "N" stands for the grade of the magnet's energy product, also known as the magnetic performance grade or magnetic grade. The magnetic performance grade of a neodymium magnet is usually represented by "N" followed by a series of numbers, such as N35, N42, N52, etc.

N52 Arc Neodymium Magnet

The higher the number, the higher the energy product of the magnet and the stronger the magnetism. For example, the magnetic performance of a N52 grade neodymium magnet is stronger than that of an N35 grade.

Specifically, the maximum energy product is a parameter that measures the magnetic performance of a magnet, and the unit is Mega Gauss Oersteds (MGOe). The larger the value, the stronger the magnetism.

Introduction to N55 grade magnets

N55 magnets are the strongest grade commercially available. The magnetism of N55 Neodymium magnets are about 2-3% stronger than N52. However, domestic magnet manufacturers can generally only reach N52 grade. Normally, the N35 NdFeB strong magnet material blank is F64*54*35.

Under normal circumstances, the magnetization direction of the NdFeB strong magnet material will not exceed the length and width of the material blank, because once the magnetization direction of the material is higher than the length and width of the material blank, the magnetization orientation of the magnetic molecules cannot be consistent, that is to say, the magnet will not be magnetized. 

What is the temperature resistance of N55 NdFeB magnets?

In order to ensure that N55 magnets have ideal saturation magnetization, manufacturers will no longer use metal elements such as heavy rare earths to increase the coercive force of the magnets. The maximum operating temperature of N55 magnets is only about 60 degrees Celsius.

Factors affecting magnet strength:

The magnetic force of a magnet is affected by its size and shape, and another important factor is temperature. Neodymium magnets begin to lose their magnetism at high temperatures. The maximum operating temperature of neodymium magnets is typically around 80°C (176°F) for standard grades and 150°C (302°F) for high-temperature grades.

In summary, the strength of neodymium magnets depends on their grade, size, shape, and operating temperature. The higher the grade of the magnet, the stronger it is. However, it is critical to select the appropriate magnet grade for your specific application, as using a magnet that is too strong may cause damage or safety hazards.

Therefore, high-performance N55 NdFeB strong magnet materials are in production. The technical difficulties in the process and sintering process are much more difficult than producing N35 materials. If you need  samples of high-strength magnets (round, disc, block, countersunk, arc, or special-shaped), please contact Ningbo Bestway Magnet Co., Ltd.