Neodymium Cylinder Magnet 12.7mm x 31.75mm N40
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Neodymium Cylinder Magnet – 12.7mm x 31.75mm | N40
The Neodymium Cylinder Magnet – 12.7mm x 31.75mm | N40 is a powerful rare earth permanent magnet engineered for industrial, commercial, and precision engineering applications requiring exceptional magnetic performance. Manufactured from premium N40 grade neodymium iron boron (NdFeB), this cylinder magnet combines impressive holding power with a slim, elongated profile, making it ideal for a wide variety of magnetic assemblies and equipment.
Measuring 12.7mm (½ inch) in diameter and 31.75mm (1¼ inch) in length, this precision-manufactured magnet is well suited to automation systems, magnetic fixtures, electric motors, sensors, robotics, laboratory equipment, product manufacturing, and custom OEM designs. Its extended cylindrical shape produces a concentrated magnetic field while allowing easy installation into drilled holes, tubular housings, and precision-machined components.
This magnet is axially magnetised through its 31.75mm length, placing the north and south poles on the two circular end faces. This pole orientation creates a focused magnetic field that delivers excellent end-to-end attraction, making the magnet ideal for magnetic holding, positioning, reed switch activation, coupling, and linear sensing applications.
Finished with a durable nickel-copper-nickel (Ni-Cu-Ni) triple-layer coating, the magnet offers excellent resistance to corrosion and everyday wear while maintaining a polished silver finish suitable for demanding industrial environments.
Whether you're designing machinery, developing new products, manufacturing specialist equipment, or building custom magnetic assemblies, the 12.7mm x 31.75mm N40 Neodymium Cylinder Magnet provides dependable performance and long service life.
Key Features
- Premium N40 grade neodymium rare earth magnet
- Dimensions: 12.7mm diameter x 31.75mm length
- Strong permanent magnetic performance
- Precision cylindrical design
- Axially magnetised through the 31.75mm length
- North and south poles located on the circular end faces
- Excellent strength-to-size ratio
- Durable nickel-copper-nickel (Ni-Cu-Ni) plated finish
- Precision manufactured for consistent performance
- Suitable for industrial, commercial, and engineering applications
Common Applications
- Industrial automation
- Engineering fixtures and jigs
- Electric motors and generators
- Robotics
- Magnetic holding systems
- Reed switch activation
- Sensor assemblies
- Scientific instruments
- Product manufacturing
- Custom OEM magnetic assemblies
Ideal For
- Engineers
- OEM manufacturers
- Automation specialists
- Machinery builders
- Product designers
- Electronics manufacturers
- Robotics developers
- Research laboratories
- Maintenance engineers
- Precision fabrication workshops
Why Choose an N40 Neodymium Cylinder Magnet?
The N40 grade offers an excellent balance of magnetic strength, durability, and value, making it suitable for a broad range of industrial and engineering applications. It delivers powerful magnetic performance while remaining a cost-effective choice for OEM production and custom projects.
The 12.7mm x 31.75mm dimensions create a long, narrow cylinder that is ideal for applications requiring a concentrated magnetic field over an extended length. This geometry is particularly effective for magnetic couplings, positioning systems, automation equipment, linear sensors, and precision mechanical assemblies.
Because the magnet is magnetised through its length, the magnetic field is concentrated on the circular end faces, providing reliable end-to-end attraction and excellent performance in holding, locating, switching, and positioning applications.
Technical Specifications
- Product Type: Neodymium Cylinder Magnet
- Material: Neodymium Iron Boron (NdFeB)
- Magnet Grade: N40
- Shape: Cylinder
- Diameter: 12.7mm
- Length: 31.75mm
- Magnetisation: Axially magnetised through the 31.75mm 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, positioning, sensing, coupling, automation, manufacturing, and precision engineering
Please Note
Neodymium magnets are extremely powerful and should always be handled carefully. This 12.7mm x 31.75mm N40 cylinder magnet can attract steel objects or other magnets with considerable force, creating pinch hazards and potentially causing the magnet to chip or crack if allowed to collide.
Actual holding force depends on the thickness, finish, and condition of the mating steel surface. Air gaps, paint, coatings, rust, 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 heavy impacts, as this may damage both the magnet and its protective coating.
Keep away from children, pacemakers, medical implants, magnetic storage media, and sensitive electronic equipment that may 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.
