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Neodymium Ring Magnet - 19mm (OD) x 8mm (ID) x 4mm (H)

Product code: 23008

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Neodymium Ring Magnet - 19mm (OD) x 8mm (ID) x 4mm (H)

Rated 5.0 out of 5
Based on 1 review
Product Code 23008
Pull Force* 4.7 kg
Weight 7 gm
Style Rare Earth Ring magnet
Gauss 4013
Grade N38
Tolerance +/- 0.05mm
Coating Nickel (NiCuNi)
Direction of Magnetisation Axially magnetised thru the 4mm
Dimensions Outside Diameter:19mm, Inside Diameter:8mm, Thickness:4mm
*Measured against up to 10mm mild steel.
Neodymium Ring Magnet - 19mm (OD) x 8mm (ID) x 4mm (H)

Magnetic Product Description:

This rare earth ring magnet has an outside diameter of 19mm, an inside diameter of 8mm and a thickness of 4mm. It is identified by the AMF magnet part number 23008.

Uses for our rare earth ring magnets:

Engineering and chemical engineering tertiary degrees proliferate in the light and heavy rail industry. So do magnets of all kinds in many different applications, including these neodymium ring magnets. Found throughout the rolling stock within wheel assemblies, braking systems and traction components, magnets are also used extensively in the lifting and depot equipment in the rail workshops.

Ring magnets engaged on an axle or rod with stationary and moving parts are used to help regulate movement necessary to ensure smooth operation of rail travel. Livestock and cargo benefit from a gentle ride as well as people.

Smooth operation of rolling stock also reduces wear and tear on the wheels and brakes and rail tracks as well as reduces noise. The known pull force of magnets allows engineers to determine release points within the system to control the transfer of force, or reduce the amount of force being directly transferred through the various assemblies.

Magnets, some very large and very small have played a vital role since the beginning of rail travel. For the coupling of the carriages, magnetic engagement has been very useful in mitigating the wild forces that swaying carriages moving at speed are able to generate. Magnetic engagement between the individual carriages also allow the engineers or builders of trains to determine at which point a carriage, often for the good of the entire train should release.

This method, or fail safe system acts a circuit breaker with the trains’ assembly, allowing one or two carriages to suffer the consequences of unexpected force while mitigating damage to the locomotive and other carriages. Magnetic engagement allows for the subtraction and addition of other carriages simply and quickly. Magnets have always, are still are, helping our trains run smoother, safer and faster for longer.

average rating 5.0 out of 5
Based on 1 review
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100% of reviewers would recommend this product to a friend
1 Review
Reviewed by James
I recommend this product
Rated 5 out of 5
Review posted


Very good quality, reasonable prices.

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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.