NdFeB Strong Magnets
Professional Supplier

The number after "N" is the maximum energy product (BHmax) in MGOe. The higher the number, the stronger the magnet. N52 is about 50% stronger than N35 but also more expensive—choose based on your application needs and cost balance.

Exceeding the maximum operating temperature causes irreversible demagnetization. The N series tops out at 80°C, M at 100°C, H at 120°C, and SH/UH/EH reach 150–200°C. Choose according to the highest temperature in your operating environment.

Standard samples take 30–40 working days; rush orders can be shortened to 20–30 days (subject to certain conditions—please call to enquire). Providing complete specifications speeds up quoting and production.

Nickel (Ni) is the most common—good corrosion resistance and low cost. Zinc (Zn) suits grounding applications. Epoxy suits humid environments. Gold (Au) offers good conductivity but higher cost, for specialized electronics.

No minimum order quantity at the sampling stage—small trial batches are welcome. Production orders depend on specifications; please call or email for a quote.

NdFeB material oxidizes and rusts easily, so a protective coating is almost always required. Choose based on environment and budget:

※ Not sure which to choose? Share your environment (humidity, temperature, indoor/outdoor, conductivity/soldering needs) and AHL will advise.

A magnet's field strength is often given as the "surface field," measured in gauss (G) or tesla (T). Conversion: 1 tesla = 10,000 gauss.

A few key concepts:

• Remanence Br sets the material's inherent field ceiling; higher grades (e.g., N52) have higher Br.
• The field decays rapidly with distance—strength drops noticeably just a short way from the surface.
• Factors affecting the surface field: grade, shape ratio (taller height/diameter = stronger), measurement distance, and whether a magnetic circuit is used (a steel yoke concentrates the field and boosts pull force).
• Surface field ≠ pull force: pull force also depends on contact area, the attracted material, and any air gap.

Want to estimate? Use our magnetic calculator (gauss, pull force, demagnetization).

• Strong magnets snap together with great force—wear gloves to avoid pinched fingers.
• NdFeB is brittle and can shatter on impact—wear safety goggles.
• Keep a safe distance if you have a pacemaker or medical electronic device.
• Keep away from credit cards, transit cards, hard drives, phones and other magnetically sensitive items.
• Avoid temperatures above the rated limit to prevent irreversible demagnetization.
• Keep away from children—swallowing multiple magnets can cause serious intestinal injury and requires immediate medical care.
• Air shipments must comply with magnetic cargo (IATA) rules using magnetic-shielded packaging.

• RoHS: restricts hazardous substances such as lead, cadmium, mercury, hexavalent chromium, PBB and PBDE.
• REACh: complies with Substance of Very High Concern (SVHC) reporting.
• RMI Conflict Minerals: free of 3TG (tin, tungsten, tantalum, gold); CMRT declaration available.

Documents available: RoHS declaration, REACh declaration, conflict-minerals declaration, SDS/MSDS. Contact us to request.

• Axial: poles on the top and bottom faces—the most common. Suits discs, cylinders, blocks.
• Diametric: poles on opposite sides of the circumference. Suits cylinders and rings.
• Multi-pole: alternating N/S pole pairs on the same face. Suits motors, encoders, sensors.
• Rings: can be axially, diametrically, or multi-pole magnetized.
• Arc / segment: usually radially magnetized, common in motor rotors.

※ Please specify the magnetization direction when ordering; if unsure, share your application and AHL will help determine it.