Neodymium Ring Magnet – 20mm (OD) x 12mm (ID) x 5mm (H) | N38
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This Neodymium Ring Magnet (20mm outer diameter x 12mm inner diameter x 5mm thick) is manufactured from high-performance Grade N38 rare earth material, delivering exceptional magnetic strength in a compact form. Its ring design makes it ideal for applications requiring secure fastening, alignment, or rotational movement around a shaft or bolt.
This magnet is identified by product code R-OD20H5ID12-N38.
Engineers, manufacturers, and hobbyists value these magnets for their high pull strength, durability, and resistance to demagnetisation, ensuring reliable performance across industrial, commercial, and DIY projects. With a nickel-copper-nickel coating, the surface is smooth, corrosion-resistant, and designed for long-term use.
Key Features:
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Dimensions: 20mm (OD) x 12mm (ID) x 5mm (thickness)
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Pull Force: 5.43 kg
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Material: Neodymium Iron Boron (NdFeB), Grade N38
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Shape: Ring magnet – perfect for positioning on shafts, screws, or rods
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Coating: Nickel-Copper-Nickel triple layer for durability and corrosion resistance
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Applications: Motors, sensors, scientific experiments, fastening systems, craft projects, and general engineering
As one of the strongest magnets available, neodymium ring magnets are trusted for demanding tasks where reliability and power are critical. This particular size balances strong holding power with versatility, making it suitable for both industrial use and creative applications.
Typical Physical Properties
NB: Ranges are indicative for product category, please check individual products for specic values within that range.
Production Flow Diagram
Demagnetization Curves
Surface Treatment
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.
Range and Tolerance
Magnets are readily available in Blocks, Discs, Cylinders & Rings. We 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.
Magnetic Properties
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.
Returns Policy
If you are not entirely satisfied with your purchase, we're here to help.
We have a 30 Day Returns policy at Frenergy Magnets. You may return your item within 30 days of receiving it to receive a refund.
The product/s must be unused and in the same condition you received them in. Please contact us at info@frenergy.com.au to initiate the returns process.
The buyer is responsible for the cost of returning the order.
