Neodymium Disc Magnet - 4mm x 3.5mm | N48
Product code: D-D4H3.5-N48
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Neodymium Disc Magnet - 4mm x 3.5mm | N48
Magnetic Product Description:
This N48 Grade Neodymium disc is 4mm in diameter and 3.5mm high. It has a pull force of 0.562 kg and surface gauss reads 6161G. It is axially magnetised through the flat, round pole surfaces. The Neodymium core is has a nickel-based protective coating.
Uses for our strong Rare Earth disc magnets:
Magnets with dimensions in this range are commonly used in modern audio, sound recording and communications equipment. Neodymium magnets are highly suited to these technologies because of their reduced size and intense magnetic power that is permanent and inexhaustible. Product designers and engineers are particularly drawn to high-grade magnets such as the N48 Neodymium disc as it provides a greater amount of magnetic pull force for the same physical dimensions as that of a lesser grade. The disc has a nickel plating as is standard with most Neodymium magnets however other coatings are available for specialised applications such as Teflon, Gold and Epoxy to name a few. Alternative coatings such as these provide greater resistance to corrosion in humid environments where the magnets or the equipment they are housed within are likely to be affected by moisture.
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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.
