Product code: C-D4H4-N48
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This popular rare earth cylinder has a diameter of 4mm and a height of 4mm. It is an N48 grade rare earth magnet. It has a magnetic flux reading of 6318 Gauss and a pull force of 0.576kg. It is identified by the AMF magnet part number C-D4H4-N48.
Small magnets that are cylindrical in shape are suited to placement inside circular drill holes or round recesses in plastic. They can then act as an attachment point for metal or make a closure mechanism with a magnet with the opposite pole exposed. The magnet can be glued in position or held in place with a thin covering which the magnetic field is able to penetrate.
Tiny magnetic closures and magnetic joins of this type are increasing in popularity with hobbyists, model makers and fashion accessory designers. The magnetic field is virtually invisible and far less conspicuous than traditional fastening methods that use clips, buttons or pins. Also referred to as rod magnets, these small magnets have a strong pull force relative to other types of permanent magnets of the same size.
Rare earth magnets were first developed in the 1980s and have since become the magnet of choice for most commercial operations where heat is not a factor. For high temperature applications it is more appropriate to use Ferrite, Alnico or Samarium Cobalt.
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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
