A magnet grade identifies the magnetic performance characteristics of a permanent magnet material. For NdFeB magnets, grades such as N35, N42, N48, and N52 indicate different levels of magnetic energy product and related performance parameters.

The number generally indicates the approximate maximum energy product, BHmax, expressed in MGOe. For example, N52 represents a higher maximum energy product than N35. However, a higher grade does not automatically mean a magnet is better for every application.

No. N52 provides higher magnetic performance in many applications, but N42 may be more suitable when cost, temperature resistance, mechanical requirements, or overall system design are considered. The appropriate grade depends on the complete magnetic circuit and application requirements.

BHmax, or maximum energy product, represents the maximum amount of magnetic energy that can be stored in a magnet per unit volume. It is commonly expressed in MGOe or kJ/m³ and is an important parameter when comparing permanent magnet grades.

Br, or remanent flux density, indicates the magnetic flux density a magnet can maintain after magnetization. A higher Br generally means stronger magnetic performance under appropriate magnetic circuit conditions.

Hcj is the intrinsic coercive force of a permanent magnet. It indicates the magnet’s resistance to demagnetization, particularly under opposing magnetic fields and elevated temperatures. High-Hcj grades are often considered for demanding industrial applications.