Neodymium Magnets are the Strongest commercially available Magnets. They are made by an alloy of neodymium, iron and boron (NdFeB). Neodymium is a rare-earth element (REE), also called rare-earth metal or (in context) rare-earth oxide. Even at their smallest size Neodymium Magnets have a Really High Magnetic Strength. But….
How strong are Neodymium Magnets?
Neodymium Magnets have a very high Magnetic Strength even in the smallest size. Their adhesive force (the property to stick to and attract ferromagnetic metals) is way stronger than other Magnets like Ferrite ones. But even among Neodymium Magnets there are different levels of strength, represented by their Grade.
This Grade is specified by a number (usually from 35 to 56) that represents the Magnetic Strength of the Neodymium Magnet, which is linked to the magnetic flux output per unit of volume. It increases with the quantity of Neodymium present in the magnet. Higher values mean stronger magnets. For reference, a small N45 3 x 2mm Neodymium Disc has a strength of attraction of 0,18 Kg, whereas a N48 Magnet of the same size has 0,25 Kg (39% more !!!).
Have a look at this simple chart with the adhesive force of magnets with different sizes, grades and materials:
Magnets Adhesive Force Reference Tables
| MAGNET | FERRITE | N35 | N38 | N40 | N42 |
| Disc D.12X3 mm | 0,20 kg | 1,80 kg | 2,26 kg | 2,38 kg | 2,52 kg |
| Disc D.20X2 mm | 0,30 kg | 2,30 kg | 2,54 kg | 2,68 kg | 2,81 kg |
| Disc D.25X3 mm | 0,45 kg | 4,28 kg | 4,84 kg | 5,09 kg | 5,35 kg |
| Disc D.30X10 mm | 2,20 kg | 16,00 kg | 19,38 kg | 20,40 kg | 21,41 kg |
| MAGNET | N45 | N48 | N50 | N52 | N56 |
| Disc D.12X3 mm | 2,68 kg | 2,86 kg | 2,98 kg | 3,10 kg | 3,34 kg |
| Disc D.20X2 mm | 3,01 kg | 3,21 kg | 3,25 kg | 3,48 kg | 3,75 kg |
| Disc D.25X3 mm | 5,73 kg | 6,11 kg | 6,37 kg | 6,63 kg | 7,15 kg |
| Disc D.30X10 mm | 22,95 kg | 24,48 kg | 25,50 kg | 26,52 kg | 28,55 kg |
These tables refer to Magnetic Discs of different sizes: diameter X thickness in mm. In our tests, a dynamometer is used to measure the required force (in kg) to detach the magnet from a 10mm steel plate. We use one magnet at a time, at room temperature, with perfect adherence to a smooth steel surface.
Neodymium and Ferrite Magnets Adhesive Force Chart
This chart refers to a Magnetic Discs with a diameter of 12mm and a thickness of 3 mm. In our tests, a dynamometer is used to measure the required force (in kg) to detach the magnet from a 10mm steel plate. We use one magnet at a time, at room temperature, with perfect adherence to a smooth steel surface.
How strong is a Neodymium Magnet compared to a Ferrite Magnet?
A Neodymium Magnet is on average 7 to 12 times stronger than a Ferrite Magnet of the same size. This depends on the grade of the neodymium magnet (from the standard N35 to the strongest N56).
What does the “magnet strength” / “force of attraction” value mean?
This value indicates the pull force of the magnet expressed in Kg. It defines the maximum possible weight that the magnet can hold before detaching. The values you can find for Magnets on SuperMagneticShop assume a single magnet, at room temperature, adhering perfectly to a smooth steel surface. All calculations are approximations. This value is not absolute and can vary depending on various factors such as the distance from the metal object, the materials involved, an uneven contact surface, the temperature and the interaction with other magnets. Contact our team for further clarification and to choose the right magnet for your application.
How is the “magnet strength” / “force of attraction” calculated?
In our tests, a dynamometer is used to measure the required force (in kg) to detach the magnet from a 10mm steel plate. We use one magnet at a time, at room temperature, with perfect adherence to a smooth steel surface.
Do you want to know more about Neodymium Magnets?
Do you need a detailed comparison between Neodymium and Ferrite Magnets?
On our Website you can find and purchase all kinds of Neodymium Magnets at the Best Price! Have a look at our products range!
