Neodymium Cylinder Magnet 5mm x 20mm N45
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Neodymium Cylinder Magnet – 5mm x 20mm | N45
The Neodymium Cylinder Magnet – 5mm x 20mm | N45 is a premium rare earth permanent magnet designed to deliver exceptional magnetic performance in a slim, elongated cylindrical profile. Manufactured from high-quality N45 grade neodymium iron boron (NdFeB), this magnet provides a powerful magnetic field while remaining compact enough for precision engineering, industrial, and commercial applications.
Measuring 5mm in diameter and 20mm in length, this cylinder magnet is ideal for installations where space is limited but extended reach or a longer magnetic profile is required. Its narrow diameter makes it well suited to drilled holes, tubular housings, shafts, sensors, actuators, and custom magnetic assemblies, while the increased length provides excellent stability and alignment within precision components.
This magnet is axially magnetised through its 20mm length, placing the north and south poles on the two circular end faces. This pole orientation concentrates the magnetic field at each end of the cylinder, making it highly effective for magnetic holding, reed switch activation, locating systems, couplings, and end-to-end attraction.
Finished with a durable nickel-copper-nickel (Ni-Cu-Ni) coating, the magnet features a polished silver finish that helps protect the neodymium core against corrosion and everyday wear. Whether you're developing automation equipment, electronic devices, scientific instruments, or custom OEM products, this 5mm x 20mm N45 Neodymium Cylinder Magnet offers reliable long-term performance and outstanding magnetic strength.
Key Features
- Premium N45 grade neodymium rare earth magnet
- Dimensions: 5mm diameter x 20mm length
- Slim, elongated cylindrical profile
- Strong permanent magnetic performance
- Axially magnetised through the 20mm length
- North and south poles located on the circular end faces
- High strength-to-size ratio
- Durable nickel-copper-nickel plated finish
- Precision manufactured for consistent dimensions
- Suitable for industrial, commercial, and engineering applications
Common Applications
- Reed switch activation
- Magnetic sensors
- Robotics and automation
- Precision locating systems
- Electric motors
- Magnetic couplings
- Electronic devices
- Laboratory equipment
- Product prototypes
- Custom OEM assemblies
Ideal For
- Engineers
- Automation specialists
- Electronics manufacturers
- Product designers
- Robotics developers
- OEM manufacturers
- Scientific laboratories
- Maintenance technicians
- Fabricators
- DIY engineering projects
Why Choose a 5mm x 20mm N45 Cylinder Magnet?
The N45 grade offers an excellent balance between magnetic strength, durability, and value, making it a popular choice for industrial and precision engineering applications. Its high magnetic energy density enables strong performance while maintaining a compact overall size.
The 5mm diameter x 20mm length provides a long, slender profile that is ideal for applications requiring deeper insertion into housings or greater stability within cylindrical components. This geometry is commonly used in locating systems, actuators, magnetic couplings, sensor assemblies, and narrow mechanical designs where a larger diameter magnet cannot be accommodated.
Because the magnet is magnetised through its length, the magnetic field is focused on the circular end faces, providing excellent end-to-end attraction and reliable performance in holding, positioning, switching, and magnetic sensing applications.
Technical Specifications
- Product Type: Neodymium Cylinder Magnet
- Material: Neodymium Iron Boron (NdFeB)
- Magnet Grade: N45
- Shape: Cylinder
- Diameter: 5mm
- Length: 20mm
- Magnetisation: Axially magnetised through the 20mm length
- Pole Orientation: North and south poles on the circular end faces
- Coating: Nickel-Copper-Nickel (Ni-Cu-Ni)
- Finish: Polished silver nickel finish
- Magnet Type: Permanent Rare Earth Magnet
- Application: Holding, sensing, positioning, coupling, automation, electronics, and precision engineering
Please Note
Neodymium magnets are extremely powerful for their size and should always be handled with care. This 5mm x 20mm N45 cylinder magnet can attract nearby steel objects or other magnets suddenly, creating pinch hazards or causing the magnet to chip if allowed to collide with hard surfaces.
Actual holding force depends on the thickness, grade, finish, and condition of the mating steel surface. Air gaps, paint, coatings, uneven contact, elevated temperatures, and sideways or peeling forces can significantly reduce magnetic performance.
Neodymium magnets are hard but brittle. Do not drill, cut, machine, weld, or subject the magnet to impact, as this may crack the magnet or damage its protective nickel coating.
Keep away from children, pacemakers, medical implants, magnetic storage media, and sensitive electronic devices that could be affected by strong magnetic fields.
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.
