NdFeB grades N35 to N52 and temperature classes

Why grades matter for procurement

NdFeB grades communicate magnetic energy and temperature capability. Buyers often focus on the N-value alone, but the temperature class (for example M, H, SH) can matter just as much as the strength number.

How grade naming works

• The N-number indicates maximum energy product. Higher numbers typically mean stronger magnets.
• Letter suffixes indicate temperature capability. Common suffixes include M, H, SH, UH, EH, AH.
• The same N-number can have different temperature limits depending on the suffix.

Typical sourcing questions

• What is the operating temperature and duty cycle?
• Are you trading strength for thermal stability?
• Do you need special coatings for the environment?

Practical selection workflow

1. Start with the required pull force or flux density.
2. Confirm operating temperature and peak exposure.
3. Select a grade and suffix that meets both requirements.
4. Confirm coating and tolerance needs with the supplier.

Common pitfalls

• Over-specifying N52 when temperature is high or stability is critical.
• Omitting suffixes in the RFQ and getting a grade that is too low for the application.
• Ignoring coating needs when the environment is humid or corrosive.

RFQ checklist

• Magnet shape and dimensions
• Required grade and temperature class
• Coating requirement
• Magnetization direction
• Quantity and target lead time