Product code: R-OD5H4ID2.5-N52
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This neodymium magnetic ring has an outer diameter of 5mm, an inner diameter of 2.5mm and the height of 4mm. It is identified by the AMF magnet part number R-OD5H4ID2.5-N52.
Although petite in size, this Neodymium ring magnet is made of powerful N52 grade rare earth material. N52 is the highest grade of Neodymium commercially available, it provides a stronger magnetic power than a magnet of the same dimensions in a lower grade such as N35 at the other end of the scale.
Small ring magnets are popular with makers of all kinds as the center hole provides an easy method of securing the magnet in place. Woodworkers utilise the hole to achieve greater purchase with glue to hold the magnet in place as a magnetic latch or closure. Knitters, felt makers and stitchers of all varieties enjoy the ability to sew through the centre of the magnet to create a magnetic means of displaying their work or as an alternative fastening system. Ring magnets really are highly adaptable as they can be attached with wire, string, cord or even slotted onto a rigid element like a bolt.
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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
