Neodymium Disc Magnets

Neodymium disc magnets are powerful permanent magnets made from an alloy of neodymium, iron, and boron, part of the rare-earth magnet family. They are characterized by their flat, circular shape, which provides a broad surface area for magnetic contact. These magnets are renowned for their exceptional strength-to-size ratio, making them a popular choice in various applications requiring compact, high-performance magnets.

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Neodymium Disc Magnet Description

Neodymium disc magnets are round, coin-shaped neodymium magnets of varying diameter and thickness. Neodymium (Neo or NdFeB) magnets are permanent magnets, small round magnets, and part of the rare-earth magnet family. Neo magnets have the highest magnetic properties and are the most powerful commercially available magnets today. Because of their magnetic strength, many consumer, commercial, and technical applications prefer neodymium disc magnets.

Stanford Magnets specializes in manufacturing and supplying neodymium disc magnets for various industrial applications. We have advanced technology, rich experience, and professional engineering technicians in this field.

Looking for a certain size? If you require a specific size that is not available on our website, please contact us for a custom magnet quote.

Neodymium Disc Magnet Specification

Item	Parameters
Material	Sintered Neodymium-Iron-Boron (NdFeB)
Size	Custom
Shape	Disc
Diameter Range	Φ1mm – Φ200mm
Thickness Range	0.5mm – 50mm
Grade	Customized (N33, N35, N38, N40, N42, N45, N48, N50, N52……)
Coating	Nickel / Customized (Zn, Ni-Cu-Ni, Ni, Gold, Silver, Copper, Epoxy, Chrome, etc.)
Size Tolerance	Diameter / Thickness: ±0.05mm; Width / Length: ±0.1mm
Magnetization	Thickness Magnetized, Axially Magnetized, Diametrally Magnetized, Multi-poles Magnetized, Radial Magnetized (Customized specific requirements)
Max. Working Temperature	N35–N52: 80°C (176°F) 33M–48M: 100°C (212°F) 33H–48H: 120°C (248°F) 30SH–45SH: 150°C (302°F)

Our range of neodymium disc magnets meets a wide variety of application needs, making us your one-stop source for powerful magnets. Whether axially or diametrically magnetized, these discs offer exceptional magnetic strength. Use our homepage magnet finder to filter by shape, size, grade, coating, and pull force for high-performance neodymium magnets.

Neodymium Discs Magnet Grade

Grade	Max Energy Product (BH)max	Surface Pull (Φ20×5mm)	Max Operating Temp	Typical Applications
N35	33–36 MGOe	~2.8 kg	80°C	Door catches, magnetic clasps, teaching aids, packaging
N38	36–39 MGOe	~3.2 kg	80°C	Sensors, general holding
N40	38–41 MGOe	~3.6 kg	80°C	Speakers, magnetic tools
N42	40–43 MGOe	~4.0 kg	80°C	Magnetic chucks, fixtures, precision holding
N45	43–46 MGOe	~4.5 kg	80°C	Drone motors, medical devices
N48	46–49 MGOe	~5.0 kg	80°C	High-performance motors, industrial automation
N50	48–51 MGOe	~5.5 kg	80°C	Advanced electronics, high-end audio
N52	50–53 MGOe	~6.0 kg	80°C	Maximum holding, strongest commercially available
42M	40–43 MGOe	~3.8 kg	100°C	Industrial equipment with mild temperature rise
48M	46–49 MGOe	~4.8 kg	100°C	Strong holding at moderate temperatures
50M	48–51 MGOe	~5.2 kg	100°C	Heat-generating equipment requiring high magnetic force
35H	33–36 MGOe	~2.5 kg	120°C	Power tools, fan motors
45H	43–46 MGOe	~4.1 kg	120°C	Automotive motors, high-performance industrial equipment
48H	46–49 MGOe	~4.6 kg	120°C	High-temperature, high-force applications
42SH	40–43 MGOe	~3.3 kg	150°C	High-performance, high-temperature motors
45SH	43–46 MGOe	~3.8 kg	150°C	High-performance, high-temperature motors

The pull values above are reference figures for a Φ20×5mm round magnet on a thick steel plate, measured perpendicular to the surface. Actual pull depends on plate thickness, contact area, magnetization direction, and other factors.

Neodymium Disc Magnet Applications

Common applications for neodymium disc magnets include craft & model-making projects, high-performance motors, jewelry clasps, audio equipment, POP displays, science projects, home improvement projects, hanging artwork & much more.

A video about our neodymium disc magnets:

FAQ

What are neodymium disc magnets?

Neodymium disc magnets are strong permanent magnets made from an alloy of neodymium, iron, and boron. They have a flat, circular shape and are part of the rare-earth magnet family, known for their exceptional magnetic strength relative to their size.

How strong are neodymium disc magnets?

The strength of neodymium disc magnets depends on their size, shape, and grade. They are among the strongest types of permanent magnets available, capable of holding materials many times their own weight. Magnet strength is typically indicated by a grade number, with higher numbers representing stronger magnets.

What are the common uses of neodymium disc magnets?

Neodymium disc magnets are used in a wide variety of applications, including in electronics (like headphones, speakers, and hard drives), in medical devices (such as MRI machines), in industrial settings (for motors, generators, and magnetic separation), and in personal or home uses (like jewelry clasps and door catches).

Can neodymium disc magnets be used outdoors?

Yes, but their suitability for outdoor use depends on the type of coating they have. Coatings like nickel, zinc, or epoxy help protect the magnets from corrosion. Epoxy coatings offer the best protection against moisture and are recommended for outdoor use.

How do you handle neodymium disc magnets safely?

To handle neodymium disc magnets safely, use caution to prevent them from snapping together and potentially causing injuries. Always keep them away from children and pets to avoid swallowing hazards, and maintain a safe distance from electronic devices and magnetic storage media to prevent damage.

Do neodymium disc magnets lose their magnetism over time?

Under normal conditions, neodymium disc magnets maintain their magnetism for decades. However, they can lose their magnetism if exposed to high temperatures, strong external magnetic fields, or if they are physically damaged.

Can neodymium disc magnets affect electronic devices?

Yes, the strong magnetic fields generated by neodymium disc magnets can damage electronic devices and magnetic storage media. It's important to keep magnets at a safe distance from such items.

Are neodymium disc magnets coated?

Neodymium disc magnets are typically coated to prevent corrosion. Common coatings include nickel, zinc, and epoxy. The coating protects the magnet from moisture and other environmental factors that could lead to corrosion.

How do I choose the right neodymium disc magnet for my project?

Consider the weight of the object you need to hold, the environment in which the magnet will be used (especially if it's outdoors or in humid conditions), and the space available for placing the magnet. The magnet's grade (which indicates its strength) and its coating (for corrosion resistance) should be appropriate for your application.

How are neodymium disc magnets manufactured?

The manufacturing process includes melting the raw materials (neodymium, iron, and boron), casting the alloy, pulverizing it into a fine powder, pressing the powder in a magnetic field to align the particles, sintering the compacted alloy, and then machining it into the disc shape. Finally, the magnets are coated to prevent corrosion.