Product code: R-OD10H3ID4
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This rare earth ring magnet has an outside diameter of 10mm, an inside diameter of 4mm and a thickness of 3mm. It is identified by the AMF magnet part number R-OD10H3ID4.
Permanent magnets come in several different types of magnetic material and Neodymium, or Rare Earth Magnets as they are otherwise known, are the strongest magnets. Neodymium ring magnets are an often overlooked shape of magnet however there are some industries that rely heavily on the circular magnetic pole of a rare earth ring. Speakers, solar power devices and even scientific instruments all rely on the unique properties of ring magnets. The volume overall of magnet material is reduced due to the hole through the centre of a ring magnet and therefore the strength of a ring shaped magnet is less than that of a disc of the same outer dimension. However the hole provides opportunities to have the magnet seated within a mechanical apparatus or housed inside a casing that other magnet shapes do not support as readily.
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NB: Ranges are indicative for product category, please check individual products for specic values within that range.
The most common coating for Neodymium magnets is Nickel + Copper + Nickel (Ni + Cu + Ni). This coating offers the magnet relatively good protection from corrosion and passive applications. If the magnet will be exposed to moisture or liquid then consider the use of an organic coating such as Epoxy. A hard wearing coating, Epoxy is suited to applications where the magnet will come under some friction or knocking.
Magnets are readily available in Blocks, Discs, Cylinders & Rings. AMF Magnetics specializes in the supply of short-run prototype magnets including Arc Segments, various magnetic orientations etc. If you need a magnet size that we don't carry in stock, submit a Design-a-Magnet enquiry for a quote on your custom magnet design.
Neodymium magnets are offered in several different grades. The first section N30-54 has an operating temperature of up to 80 degrees. Most of our stock only goes up to N38. The second section, denoted with the "M" prefix after the grade has an operating temperature 100 degrees. After this the grades are "H", "SH", "UH" & "EH". In order for the magnet to withstand a higher operating temperature, during production more of the raw material PrNd is incorporated as these elements have a naturally occurring resistance to high temperatures.
The Pull Force listed for each magnet is based on lifting 10mm thick steel from a horizontal surface. Magnets on a vertical surface (of 10mm thick steel) are generally able to hold around only 30% of the pull force listed in the product description. This is due to the effects of gravity and the lack of friction between the surface and the shiny magnet. Read More
