Neodymium Ring Magnet OD5mm x H4mm | Hole 2.5mm | N42UH | High Temperature ≤180ºC | Diametrically magnetized
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This Neodymium Ring Magnet has an outer diameter of 5mm, inner diameter of 2.5mm, and height of 4mm, delivering high magnetic strength in a compact form. Manufactured from premium N42UH grade neodymium, this ring magnet is engineered for high temperature resistance up to 180°C, making it ideal for demanding applications where consistent performance is essential.
This magnet is identified by product code 23023A.
Unlike standard axially magnetised rings, this magnet is diametrically magnetised, meaning the north and south poles are located on opposite curved sides. This unique magnetisation pattern makes it highly suitable for rotor assemblies, sensing devices, couplings, and specialised engineering projects that require rotational magnetic fields.
Key Features:
Dimensions: 5mm (OD) x 2.5mm (ID) x 4mm (H)
Grade: N42UH Neodymium – high strength with elevated temperature stability
Diametrically magnetised for specialised applications
Temperature Resistance: Up to 180°C
Compact size with powerful magnetic field
Applications:
Electric Motors & Generators – effective in rotor and stator configurations.
Sensors & Encoders – precise diametrical polarity for advanced detection systems.
Magnetic Couplings – efficient torque transfer in confined spaces.
Engineering Prototyping – custom builds requiring high strength at elevated temperatures.
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.
