China Neodymium And Ferrite Magnets Manufacturer & Supplier 
I just saw a netizen searching about a magnet question, asking what grade the 3700GS represents—N35 or N38? It seems the customer wants to know its specific grade. Below, Xiao Fu will answer this question based on years of professional experience.
Regarding such questions, Xiao Fu has also provided considerable explanation. GS (Gauss) represents magnetic flux density, typically measured at a specific point on the magnet's surface using a Gaussmeter, indicating the magnetic field strength at that location. Meanwhile, what we commonly refer to as “magnetic force” or “attraction” (measured in N or kgf) depends on multiple factors including the magnet's volume, shape, working air gap, the material being attracted, and the testing method employed.
Many people hope to infer the grade of a magnet—such as whether it's N35, N38, N42, etc.—by using a Gauss value (like 3700 Gauss here). However, in practical applications, this approach is unreliable. Why?
Defective neodymium ring magnets
Therefore, 3700 GS does not directly correspond to any specific grade of neodymium magnet; it is merely a test result.
In actual testing, our team conducted a surface magnetic flux density test on a Φ5×8mm axially magnetized cylindrical neodymium magnet rated as N35. Measured using a Japanese Gauss meter, the surface magnetic flux density was approximately 3700 GS. However, it's important to note that this does not mean all 5×8mm magnets will necessarily be 3700GS. Changing the thickness, diameter, material grade, or magnetization direction will significantly alter the surface Gauss value.
So, what does 3700 GS represent in terms of magnetic strength? The answer is that it represents nothing specific. This Gauss value is more suitable for comparing magnetic strength between magnets of the same size, ensuring material consistency or batch stability, and determining whether significant demagnetization has occurred.
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