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About Neodymium Magnets

What does pull force mean?

Every neodymium magnet has a pull force, which tells you exactly how strong that magnet is. Measured in pounds or kilograms, the pull force is the force required to pull that magnet straight free from a 1/8 inch (3.175 mm) thick steel plate. This means that the pull force also tells you the limit on the holding power of the magnet.Generally, any magnet with a pull force above seven pounds (3.175 kg) can pinch your fingers. Stronger magnets can be even more dangerous and should only be handled by experienced individuals.Magnet placement can dramatically affect pull force.While the pull force...

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Are neodymium magnets waterproof?

No. While magnets are typically coated with nickel, zinc or epoxy to protect them against rust and corrosion from moisture – they are not waterproof. Neodymium magnets will work submerged, soaked or underwater for a short period. Any water penetration into the magnet, however, will cause a slow deterioration of the magnet’s magnetic field and cause rust to leak from even the most microscopic scratch or aberration in the magnet’s outer coating. If you are looking for waterproof neodymium magnets, check out our Sewing Magnets. These magnets are encased in a waterproof PVC pouch that protects them from moisture.

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Will neodymium magnets lose their strength over time?

Very little. If they are properly handled, which includes not overheated or physically damaged, our neodymium magnets will lose less than 1% of their strength over 10 years. This is not enough to notice without very sensitive measuring equipment. In addition, the neodymium magnets we offer will not lose their strength even if they are held in repelling or attracting positions with other magnets over long periods of time.

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Can I drill or machine or machine neodymium magnets?

Generally speaking, no. All neodymium magnets, while solid and hard, are also very brittle. The hardness of the neodymium nickel coating material is rated at RC46 on the Rockwell "C" scale, and this is harder than commercially available drills and tooling. As a result, these tools will heat up and become damaged if used on NdFeB material. Machining of neodymium magnets can be done, but should only be performed by experienced machinists familiar with the risk and safety issues involved. Normally, diamond tooling, EDM (Electrostatic Discharge Machines), and abrasives are the preferred methods for shaping neodymium magnet material. It is...

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Can moisture and temperature affect neodymium magnets?

Yes. Although they have the highest magnetic field strength and have a higher coercivity (which makes them magnetically stable), neodymium magnets have a lower Curie temperature and are more sensitive to heat and vulnerable to oxidation than samarium-cobalt magnets. While neodymium magnets have been proven to retain their effectiveness up to 80°C or 175°F, this temperature may vary depending on the grade, shape and application of the particular magnet. If a magnet heated above its maximum operating temperature (176°F (80°C) for standard N grades) the magnet will permanently lose a fraction of its magnetic strength.  If they are heated above...

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