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Neodymium Cylinder Magnet - 4mm x 20mm

Product code: 21051

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Neodymium Cylinder Magnet - 4mm x 20mm

Product Code 21051
Pull Force* .630 kg
Weight 2 gm
Style Rare Earth Cylinder magnet
Gauss 6269
Grade N38
Coating Nickel (NiCuNi)
Direction of Magnetisation Axially magnetised
Dimensions Height:20mm, Diameter:4mm
*Measured against up to 10mm mild steel.
Neodymium Cylinder Magnet - 4mm x 20mm

Magnetic Product Description:

This rare earth cylinder has a diameter of 4mm and a height of 20mm. It has a magnetic flux reading of 6269 Gauss and a pull force of 0.630kg. Its part number is 21051.

Uses for our rare earth cylinder magnets:

This Neodymium Cylinder magnet has a small diameter creating a narrow magnetic field, concentrated by the length of the magnet to create a penetrating field through the polarised flat faces. This type of magnetic field means cylinders are not usually chosen for weight bearing or holding applications. Metal detection and removal applications are well suited to magnets such as these, utilising the concentrated depth of magnetic field to locate ferrous materials such as steel studs beneath a substrate. These are also a great magnet to have on hand for keeping your workspace free of metal filings and stray screws. Popular with those working in metal working industries such as Toolmakers, Tradespeople and Steel-fixers who use cylinder magnets to keep their work areas uncontaminated and to product quality at the highest standard possible.

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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.