Which NdFeB magnet is stronger, N52 or N35?

In modern industry and everyday applications, NdFeB magnets are known as the "King of Magnets" for their exceptional magnetic properties. They are the strongest known permanent magnet material and are widely used in motors, sensors, medical devices, electronic products, and even new energy vehicles.

When discussing the performance of NdFeB magnets, grade designations such as N35 and N52 are often mentioned. What do these designations represent, and what are the differences between them? When choosing a product, many customers are confused: which has higher strength (or magnetic energy product), N52 or N35?

The Secret of Magnet Grades: N52's Performance Far Exceeds N35

NdFeB magnets grades, such as N35 and N52, are designated based on their maximum magnetic energy product (BH)_max, a key indicator of a magnet's ability to store magnetic energy and the most important parameter determining its magnetic field strength and attractive force.

"N": stands for the standard temperature rating, typically indicating a maximum operating temperature of 80°C.

The number (35, 52, etc.): This number approximates the maximum magnetic energy product, measured in mega-gauss-oersteds (MGOe).

Thus, the answer is clear: N52-grade NdFeB magnets are much stronger than N35-grade ones.

• N35: This means their maximum magnetic energy product is approximately 35 MGOe.
• N52: This means their maximum magnetic energy product is approximately 52 MGOe.
  
  

Theoretically, given the exact same size and shape, an N52 magnet provides approximately 48.6% higher magnetic field strength than an N35 magnet (52/35 ≈ 1.486). This means that in the same application, you can use a smaller, more powerful N52 magnet to achieve the same effect as a larger N35 magnet, thereby miniaturizing and lightweighting your product.

How do I choose the right NdFeB magnet?

Choosing the right grade of NdFeB magnets shouldn't solely focus on strength. In practical applications, the following key factors should also be considered:

• Operating Temperature: If your application requires operation at higher temperatures (such as 100°C, 120°C, or even higher), you should choose magnets with a higher-temperature grade suffix, such as N35M (M stands for up to 100°C) or N38H (H stands for up to 120°C), rather than just N35 or N52.
  
  
• Cost Budget: High-grade magnets like N52 require more complex production processes and are therefore generally more expensive than N35. Choosing the right grade is key to achieving a balance between performance and cost.
  
  
• Application Requirements: For precision equipment with extremely high magnetic flux requirements and limited space (such as high-performance motors and precision sensors), N52 is undoubtedly the preferred choice. For less demanding or cost-sensitive applications, N35 is fully sufficient and offers a very cost-effective permanent magnet material.
  
  

N52-grade NdFeB magnets offer higher strength and magnetic energy product, representing the highest performance of commercially available high-performance magnets. However, when purchasing, it's crucial to choose the most appropriate NdFeB grade based on your product's temperature, size, and cost requirements.