Neodymium Cylinder Magnet 4mm x 4.75mm N42
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Neodymium Cylinder Magnet – 4mm x 4.75mm | N42
The Neodymium Cylinder Magnet 4mm x 4.75mm | N42 is a compact, high-strength rare earth permanent magnet designed for precision applications where reliable magnetic performance and a small footprint are essential. Manufactured from premium N42-grade Neodymium Iron Boron (NdFeB), this cylinder magnet measures 4mm in diameter and 4.75mm in length, making it ideal for electronics, sensors, automation, medical devices, engineering prototypes, and OEM manufacturing.
Despite its compact size, the N42 magnetic grade delivers impressive holding power and a concentrated magnetic field, making it significantly stronger than ferrite magnets of comparable dimensions. The magnet is axially magnetised, with the north and south poles located on the flat ends of the cylinder, providing maximum magnetic strength for insertion into drilled holes, precision assemblies, and magnetic positioning systems.
The magnet is protected by a durable nickel-copper-nickel (Ni-Cu-Ni) coating, offering excellent resistance to corrosion, oxidation, and general wear while maintaining a smooth, polished finish suitable for long-term use.
Whether you're designing electronic products, manufacturing magnetic assemblies, building automation systems, or creating precision engineering solutions, the 4mm x 4.75mm N42 Neodymium Cylinder Magnet provides dependable, long-lasting magnetic performance.
Key Features
- Premium N42-grade neodymium rare earth magnet
- Dimensions: 4mm diameter x 4.75mm length
- Compact cylinder design with excellent magnetic strength
- Axially magnetised for maximum end-face magnetic performance
- Durable nickel-copper-nickel (Ni-Cu-Ni) protective coating
- Excellent resistance to corrosion and oxidation
- Precision manufactured for consistent magnetic performance
- High-strength permanent magnet
- Suitable for industrial, commercial, and precision engineering applications
Common Applications
- Reed switches and magnetic sensors
- Electronics manufacturing
- Robotics and automation systems
- Medical and laboratory equipment
- Magnetic couplings
- Precision engineering assemblies
- OEM product manufacturing
- Scientific instruments
- Prototype development
- Custom magnetic mechanisms
Ideal For
- Electronics engineers
- Mechanical engineers
- Automation specialists
- Product designers
- OEM manufacturers
- Medical device manufacturers
- Research laboratories
- Makers and precision fabricators
Why Choose a 4mm x 4.75mm N42 Neodymium Cylinder Magnet?
The 4mm x 4.75mm N42 Neodymium Cylinder Magnet is an excellent choice for applications requiring a compact yet powerful permanent magnet. Its near-equal diameter and length create a balanced magnetic field that is ideal for magnetic sensing, positioning, retaining, and alignment tasks.
Manufactured from premium N42-grade neodymium, this magnet provides outstanding magnetic strength relative to its size, allowing designers and engineers to reduce component size without sacrificing performance. Its precision cylindrical shape also makes it easy to install into drilled holes, moulded plastic components, and custom machined assemblies.
Technical Specifications
- Material: Neodymium Iron Boron (NdFeB)
- Magnet Grade: N42
- Shape: Cylinder
- Diameter: 4mm
- Length: 4.75mm
- Magnetisation: Axial (through the length)
- Coating: Nickel-Copper-Nickel (Ni-Cu-Ni)
- Magnet Type: Permanent Rare Earth Magnet
Please Note
This is a high-strength rare earth magnet and should be handled carefully. Although compact, it produces a strong magnetic field and can snap together unexpectedly with other magnets or steel objects, potentially causing pinch injuries or damage to the magnet.
Maximum holding force is measured under ideal conditions using a clean, flat, thick mild steel surface with full end-face contact. Actual magnetic performance will vary depending on the steel thickness, air gap, surface finish, mounting arrangement, and operating environment.
Keep away from children, as small magnets can present a serious swallowing hazard. 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 chip or fracture under excessive mechanical stress. For optimum performance and service life, avoid prolonged exposure to corrosive environments or temperatures exceeding the recommended operating range for standard N42 neodymium magnets.
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.
