Neodymium Cylinder Magnet 4mm x 5mm N38 | Copper Coated
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Neodymium Cylinder Magnet – 4mm x 5mm | N38 | Copper Coated
The Neodymium Cylinder Magnet 4mm x 5mm | N38 | Copper Coated is a compact, high-performance rare earth permanent magnet designed for applications requiring reliable magnetic strength in a miniature cylindrical form. Measuring 4mm in diameter and 5mm in length, this magnet is manufactured from premium N38-grade Neodymium Iron Boron (NdFeB) and features an attractive copper-coated finish, making it ideal for engineering, electronics, product assembly, crafts, and decorative applications.
Despite its small size, this neodymium cylinder magnet delivers significantly greater magnetic strength than ferrite or Alnico magnets of similar dimensions. Its compact profile makes it an excellent choice for precision assemblies, magnetic closures, sensors, model making, prototypes, and products where space is limited but dependable magnetic performance is essential.
The copper coating provides a distinctive warm metallic appearance while protecting the magnet against corrosion and oxidation. This finish is particularly popular for premium products, visible magnetic components, luxury packaging, decorative displays, and custom-made items where aesthetics matter alongside functionality.
This magnet is axially magnetised, meaning the north and south poles are located on the two flat circular ends, providing maximum holding force when used end-to-end or against a ferrous steel surface.
Key Features
- Premium N38-grade neodymium rare earth magnet
- Dimensions: 4mm diameter x 5mm length
- Attractive copper-coated finish
- Strong magnetic performance for its compact size
- Axially magnetised for maximum end-face holding strength
- Durable corrosion-resistant coating
- Precision manufactured for consistent quality
- Long-lasting permanent magnet
- Suitable for industrial, commercial, and decorative applications
Common Applications
- Electronics and sensors
- Product manufacturing and assembly
- Magnetic closures
- Precision engineering
- Model making
- Scientific instruments
- Retail displays
- Arts and crafts
- DIY projects and prototyping
Ideal For
- Engineers
- Product designers
- Electronics manufacturers
- Cabinet makers
- Hobbyists and makers
- Schools and STEM education
- Research laboratories
- OEM manufacturers
Why Choose a Copper Coated Neodymium Cylinder Magnet?
The 4mm x 5mm N38 Copper Coated Neodymium Cylinder Magnet combines compact dimensions, reliable magnetic strength, and an eye-catching finish. The N38 grade provides excellent performance for a wide range of industrial and commercial applications, while the copper coating gives the magnet a premium appearance that is ideal for visible installations and decorative products.
Its cylindrical design is particularly well suited to drilled holes, press-fit installations, magnetic alignment systems, small mechanical assemblies, and compact devices where both precision and holding power are important.
Technical Specifications
- Material: Neodymium Iron Boron (NdFeB)
- Magnet Grade: N38
- Shape: Cylinder
- Diameter: 4mm
- Length: 5mm
- Magnetisation: Axial (through the length)
- Coating: Copper
- Magnet Type: Permanent Rare Earth Magnet
Please Note
This is a powerful rare earth magnet and should be handled with care. Although small, it can attract other magnets or steel objects with considerable force, creating pinch hazards or causing the magnet to chip if allowed to snap together.
Maximum holding force is achieved under ideal conditions using a clean, flat, thick ferrous steel surface with direct contact. Actual performance will vary depending on the steel thickness, air gap, surface finish, mounting method, and operating environment.
Keep away from children, as small magnets present a serious swallowing hazard. Also keep away from pacemakers, implanted medical devices, sensitive electronic equipment, and magnetic storage media. Do not drill, machine, or strike the magnet, as neodymium is hard but brittle and may crack or fracture if subjected to impact. While the copper coating offers excellent corrosion resistance and a distinctive appearance, avoiding excessive abrasion and harsh chemicals will help preserve its finish over time.
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.
