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PLASTIC COATED N48 Rare Earth Neodymium Magnets 3/4" diameter x 1/8" Disc
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Model: MP1-N48
Price $20


Rare earth magnets are a special type of magnet. They are the worlds strongest type of magnet and are composed of Neodymium, Iron and Boron (NdFeB) elements. Size of magnet: 3/4 inch diameter x 1/8 inch thick disc. Size including plastic coating: 7/8 inch diameter x 1/4 inch thick. (19.1 mm x 3.2 mm) Size including plastic coating (22.2 mm x 6.4 mm). Magnet encased inside impact resistant hard plastic shell. Grade: N48 - Extremely powerful magnetic material NEODYMIUM MAGNETS ARE NOT SAFE FOR CHILDREN These discs are axially magnetized, so the strong North/South poles are in the center of the flat sides. That makes them easier to stack into a cylinder than to connect side by side. What are the advantages and disadvantages of plastic encased magnets? The biggest drawback to Neodymium magnets is while magnetically very strong, they are very physically fragile. Tough coatings, such as nickel, go a long way toward protecting the magnets from cracks and breakage. However, after repeated impacts with each other or other surfaces, even the best metal coatings will fail. Plastic coatings offer an impact and corrosion protection for the fragile magnets inside. These magnets can sustain far more punishment than the standard metal coated magnets, making these a good play or experimention magnet. However, on the negative side, this relatively thick coating reduces the effective power of the magnet due to the logarithmic drop in magnet strength as the distance increases from the surface of magnet. How much of a difference? 2 standard nickel coated 3/4 x 1/8" N48 disc magnets will pull at each other with about 9 pounds of force. Two 3/4 x 1/8" N48 plastic coated will only pull with about 5 pounds of force. That is 45% less strength. So it is a trade-off. If you require maximum power, go with metal coated: if you plan on playing with neodymium magnets A LOT these are the magnets for you! These Neodymium Iron Boron magnets are also known as "Rare Earth" or NdFeB magnets. Neodymium magnets are simply incredible! They are far more powerful than those old horseshoe magnets most of us grew up with. What can these magnets be used for? They are fun to play with, but these magnets have many practical uses as well. Use them on the fridge. Put them to work in the tool shed. Use them as fasteners on cabinetry. They are great for science experiments. You are limited only by your imagination.