What are Neodymium Magnets
Neodymium magnets, also known as neodymium-iron-boron (NdFeB) magnets, are a type of rare-earth magnet. They are the strongest permanent magnets available commercially and are known for their exceptional magnetic properties. These magnets are composed primarily of neodymium, iron, and boron, with small traces of other elements. The combination of these materials creates a powerful magnetic field that makes neodymium magnets extremely strong for their size. They come in various shapes and sizes, such as discs, cylinders, spheres, and more.
What are Magnet Grades?
A magnet grade is a measure of the strength of a magnet and in most cases a higher number indicates a stronger magnet. The grade number starts with the letter N for neodymium magnets. The number that follows is the maximum energy product of the magnet in Mega-Gauss Oersteds. This is the primary indicator of a magnets strength. The greater the number, the greater the magnetic field the magnet will generate in an application and represents the strongest point on the BH Curve (Magnet’s Demagnetization Curve).
What are the grades of neodymium magnets?
| Material | Br | Hcb (Hc) | Hcj (Hci) | (BH)max | ||||
| mT | G | kA/m | Oe | kA/m | mT | G | kA/m | |
| N27 | 1,030 | 10,300 | 796 | 10,000 | 955 | 12,000 | 119 | 25 |
| N30 | 1,080 | 10,800 | 796 | 10,000 | 955 | 12,000 | 223 | 28 |
| N33 | 1,130 | 11,300 | 836 | 10,500 | 955 | 12,000 | 247 | 31 |
| N35 | 1,170 | 11,700 | 868 | 10,900 | 955 | 12,000 | 263 | 33 |
| N38 | 1,220 | 12,200 | 899 | 11,300 | 955 | 12,000 | 287 | 36 |
| N40 | 1,250 | 12,500 | 907 | 11,400 | 955 | 12,000 | 302 | 38 |
| N42 | 1,280 | 12,800 | 915 | 11,500 | 955 | 12,000 | 318 | 40 |
| N45 | 1,320 | 13,200 | 923 | 11,600 | 955 | 12,000 | 342 | 43 |
| N48 | 1,380 | 13,800 | 923 | 11,600 | 955 | 12,000 | 366 | 46 |
| N50 | 1,400 | 14,000 | 796 | 10,000 | 876 | 11,000 | 382 | 48 |
| N52 | 1,430 | 14,300 | 796 | 10,000 | 876 | 11,000 | 398 | 50 |
What are neodymium magnets used for?
Neodymium magnets are used for a wide variety of industrial applications including: locks, bearings and couplings, motors, generators and much more.
Why are neodymium magnets coated?
Neodymium reacts to oxygen and oxidizes if untreated. That's why a protective coating is needed. The coating is so thin that it doesn't significantly impact the force of the magnet.
What are common coatings?
Nickel (Ni-Cu-Ni) - Most common and is a shiny metallic color. It has a great price/performance coating.
Gold-coating (Ni-Cu-Ni-Au) - Thin coating and is a shiny metallic color. It rubs off so good for decorative purposes only.
Chrome (Ni-Cu-Ni-Cr) - Good resistance to rubbing and is a dull gray color. Great for round or spherical magnets.
Copper (Ni-Cu) - A dull brown-red-metallic color and frequently used for decorative purposes.
Epoxy resin (Ni-Cu-Ni-Epoxy) - Black color and is non-corrosive. Coating is brittle.
Below you will find common questions that need to be answered before ordering:
- What info do we need to know to help you with your application?
- Any specific size the magnet need to be?
- What is the maximum operating temperature that the magnet will be exposed to?
- What other materials will the magnet be exposed to?
- Are there specific coating requirements?
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