Product code: 20016
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This neodymium rare earth disc magnet has a diameter of 20mm and a height of 4mm. This magnets power comes from It has a magnetic flux reading of 2340 Gauss and a strong magnetic pull force of 5.5kg. It is identified by the AMF magnet part number 20016.
This 20mm x 4 mm rare earth magnetic disc is one of our most popular products. The size and strength of this permanent magnet make it an incredibly versatile product.
Smaller sized discs such as this make great closure devices when stitched or seamed into fabric, shade cloth, insulation, curtains. These discs can be inserted inside a seam and coupled with another magnet or steel to create a secure closure. Neodymium rare earth magnets have also been adopted by fashion designers to hold complex and voluminous fabric arrangements in place on the catwalk. If you have ever wondered how those bizarre high fashion outfits are held in check, magnets are the solution.
They are also used for many industrial and manufacturing applications such as metal separation, pharmaceutical stirrers, metal detectors, tool holders, clamps, and metal and stud finders.
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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
