Complete NdFeB Grade Selection Guide | N-Series Performance, Temperature Rating & Common Selection Mistakes

NdFeB grade is the core reference for magnet selection. Numbers indicate magnetic energy while suffix letters define temperature resistance. Proper grade selection cuts cost and avoids permanent demagnetization caused by overheating.

1. Naming Principle

Prefix N stands for NdFeB base material; the numeric part equals max energy product in MGOe (higher number = stronger magnetism under same size); suffix letters (M/H/SH/UH/EH/AH) determine heat resistance, irrelevant to magnetic force. Typical surface gauss: N35(12200Gs), N38(12600Gs), N42(13300Gs), N45(13700Gs), N48(14100Gs), N52(14800Gs).

2. Temperature Rating Table

表格

Note: Thin-size magnets deliver lower actual heat resistance than rated specification, requiring higher suffix upgrade.

3. Grade Classification & Application

• N35-N38: Cost-effective for fridge magnets, craft accessories, regular holding fixtures.
• N42: Best cost-performance for standard motors, magnetic separators, loudspeakers (80% common applications).
• N45-N48: High energy for precision instruments, high-efficiency generators, compact automation components.
• N50-N52: Ultra-high magnetism for space-limited aerospace, premium drive motors with high budget.
• N55+: Theoretical lab grade with unstable mass production, rarely commercialized.

4. Four Core Selection Factors

Magnetic requirement, working ambient temperature, total budget and finished magnet dimension. Choose higher grade for limited mounting space or larger size with lower grade for cost saving.

5. Four Common Selection Mistakes

Over-spec to highest grade blindly; ignore working temperature leading to irreversible demagnetization; judge grade only by pull force; neglect factory performance tolerance difference between suppliers.

6. Standard Selection Process

Confirm temp/size/force → prototype with N42 first → upgrade grade/suffix for high temp or limited space → cost evaluation → lab test before bulk order.

Summary

Grade selection needs comprehensive consideration of temperature, structure and budget instead of focusing only on magnetic strength. We offer customized magnet solutions including grade optimization, dimension design and surface coating based on your application parameters, supporting prototype test and mass production.