When sourcing magnets B2B, you will invariably see codes like "N35", "N42", or "N52" in every neodymium product description. These codes are the most critical factors determining the quality, power, and price of the product you are purchasing.
The Letter "N" and the MGOe Value
The letter "N" in the code indicates that the material is Neodymium (NdFeB) and is designed to operate at standard temperatures (max 80°C). The number next to the N represents the magnet's Maximum Energy Product (BHmax). This value is expressed in units of MGOe (Mega Gauss Oersted).
What are the Differences?
- N35 Grade: The most common grade on the market, offering the best cost-performance balance. Used in a wide range of applications from box closures to standard industrial sensors. It generates an energy of 35 MGOe.
- N42 Grade: Approximately 20% stronger than N35. Ideal for audio systems, industrial brushless motors, and high-efficiency Magnetic Equipment (separators).
- N52 Grade: The highest grade magnet available as a standard production. It offers nearly 50% more pull force compared to N35. It is used in the aerospace industry or in specialized medical devices where the size must be extremely small, but the required power is immense. Its cost is significantly higher.
So, Which One Should I Choose?
If space is not a constraint in your application, you can achieve the same pull force as a tiny N52 by simply choosing a slightly larger physical size of the cheaper N35 grade, often at the same or lower cost. Engineering is entirely the art of optimization.