Neodymium Disc Magnet 25mm x 2.5mm N38 | North Marked
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Neodymium Disc Magnet – 25mm x 2.5mm | N38 | North Marked
Designed for precision applications where pole orientation matters, this Neodymium Disc Magnet measures 25mm in diameter x 2.5mm thick and is manufactured from premium N38-grade NdFeB (Neodymium Iron Boron) rare earth magnetic material. Featuring a clearly North-marked face, this high-performance permanent magnet is ideal for engineering, electronics, sensors, scientific experiments, product development, and magnetic assemblies requiring consistent magnetic polarity.
Neodymium magnets are the strongest commercially available permanent magnets, offering significantly greater magnetic strength than ferrite, Alnico, or samarium cobalt magnets of similar dimensions. Despite its slim 2.5mm profile, this magnet delivers impressive holding power while maintaining a low-profile design that is ideal for applications where installation space is limited.
This magnet is axially magnetised, meaning the magnetic poles are located on the two flat 25mm diameter faces. One face is clearly marked to indicate the North pole, making installation quicker and ensuring correct polarity when pairing magnets or assembling magnetic systems.
Finished with a durable nickel-copper-nickel (Ni-Cu-Ni) coating, the magnet provides excellent resistance to corrosion and everyday wear while maintaining a smooth, polished finish.
Features & Benefits
- Premium N38-grade rare earth neodymium disc magnet
- Dimensions: 25mm diameter x 2.5mm thickness
- North pole clearly marked for easy identification
- Axially magnetised for maximum face-to-face holding performance
- Slim profile with exceptional magnetic strength
- Durable nickel-copper-nickel (Ni-Cu-Ni) coating
- Precision-manufactured for consistent quality
- Long-lasting permanent magnet
- Suitable for industrial, commercial, laboratory, and DIY applications
Common Applications
- Magnetic assemblies requiring correct polarity
- Sensors and electronic devices
- Product development
- Scientific research and laboratory work
- Magnetic fixtures and jigs
- Automation equipment
- Educational demonstrations
- DIY engineering projects
Ideal For
- Engineers
- Electronics technicians
- Manufacturers
- Product designers
- Research laboratories
- Educational institutions
- Automation specialists
- Makers and hobbyists
Why Choose a North Marked Neodymium Magnet?
A North-marked neodymium magnet simplifies installation by clearly identifying magnetic polarity, eliminating the need to test pole orientation during assembly. This is particularly valuable for applications involving multiple magnets, magnetic couplings, reed switches, Hall effect sensors, motors, actuators, and precision magnetic systems where consistent pole alignment is essential.
The N38-grade neodymium material provides an excellent balance of magnetic strength, durability, and reliability, while the slim 2.5mm thickness makes this magnet suitable for compact designs without compromising performance.
Please Note
This is a high-strength rare earth magnet and should be handled carefully to prevent pinch injuries or damage caused by magnets snapping together. Holding performance is achieved under ideal conditions using a clean, flat, thick ferrous steel surface with full face-to-face contact. Actual magnetic strength will vary depending on the steel thickness, surface finish, air gap, and application.
The North mark is provided solely to identify magnetic polarity and does not affect the magnet's performance. Keep away from children, pacemakers, implanted medical devices, sensitive electronic equipment, and magnetic storage media. Avoid drilling, machining, excessive heat exposure, or heavy impacts, as these may permanently damage the magnet or reduce its magnetic performance.
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.
