Ferrite Disc Magnet – 20mm x 3mm

The Ferrite Disc Magnet – 20mm x 3mm is a versatile and economical ceramic permanent magnet designed for general-purpose magnetic holding, manufacturing, craft, educational and DIY applications. Measuring 20mm in diameter and 3mm thick, this low-profile ferrite magnet provides reliable magnetic performance while remaining lightweight, durable and cost-effective.

Ferrite magnets, also known as ceramic magnets, are widely used as an economical alternative to rare earth magnets when extremely high magnetic strength is not required. Their excellent natural resistance to corrosion means they generally do not require protective plating, making them suitable for a broad range of indoor and appropriate outdoor applications.

The 20mm x 3mm disc shape provides a broad, flat magnetic surface while maintaining a slim profile. This makes the magnet particularly useful for craft projects, displays, product manufacturing, educational experiments, magnetic closures and other applications where a thin circular magnet is preferred.

Key Features

• Ferrite disc magnet / ceramic magnet
• Dimensions: 20mm diameter x 3mm thickness
• Slim, low-profile circular design
• Economical permanent magnet
• Naturally resistant to corrosion
• No protective metallic coating typically required
• Good resistance to demagnetisation
• Durable magnetic performance
• Cost-effective for larger-volume applications
• Suitable for commercial, industrial, educational and DIY use

Common Applications

• Craft and hobby projects
• Fridge magnets and promotional products
• Educational science experiments
• Displays and signage
• Product manufacturing
• Magnetic closures
• Models and prototypes
• General magnetic holding
• Workshop projects
• Custom magnetic assemblies

Why Choose a 20mm x 3mm Ferrite Disc Magnet?

The 20mm diameter provides a useful magnetic contact area, while the 3mm thickness keeps the magnet relatively flat and lightweight. This combination makes it easy to incorporate into products, displays and craft projects where a thicker or more powerful rare earth magnet may be unnecessary.

Ferrite magnets are particularly popular for high-volume and cost-sensitive applications because the raw magnetic material is generally more economical than neodymium.

They also retain their magnetic properties permanently under normal operating conditions and offer excellent resistance to corrosion, making them a dependable choice for long-term magnetic applications.

Ferrite vs Neodymium Magnets

Ferrite magnets provide less magnetic strength for their size than neodymium rare earth magnets, but they offer several advantages depending on the application.

Ferrite magnets are generally:

• More economical
• Naturally corrosion resistant
• Resistant to demagnetisation
• Suitable for many general-purpose applications
• Available in practical shapes and sizes for bulk manufacturing

For applications where maximum magnetic force is required from the smallest possible magnet, neodymium may be more suitable. Where affordability, corrosion resistance and dependable general-purpose magnetic performance are more important, ferrite is often an excellent choice.

Technical Specifications

• Product Type: Ferrite Disc Magnet
• Alternative Name: Ceramic Disc Magnet
• Material: Ferrite / Ceramic Magnetic Material
• Shape: Disc
• Diameter: 20mm
• Thickness: 3mm
• Magnet Type: Permanent Magnet
• Corrosion Resistance: Naturally corrosion resistant
• Typical Applications: Holding, manufacturing, crafts, displays, education and product development

Ideal for Crafts, Manufacturing and General-Purpose Use

This 20mm x 3mm ferrite magnet is suitable for businesses, manufacturers, schools, makers and DIY users looking for an affordable circular magnet for repeat-use or production applications.

For permanent installations, the flat face can be bonded to suitable materials using an adhesive selected for both the ferrite surface and the substrate. Surfaces should be clean, dry and appropriately prepared before bonding.

When incorporating ferrite magnets into manufactured products, allow adequate space around the magnet to avoid excessive mechanical pressure, as ceramic magnetic material is hard but brittle.

Please Note

Ferrite magnets are hard and brittle ceramic components. They can chip, crack or break if dropped, struck or allowed to snap forcefully against another magnet or hard surface.

Actual magnetic holding performance depends on the mating material, steel thickness, contact area, surface condition, air gap and direction of applied force. Paint, coatings, adhesive layers and other gaps between the magnet and steel surface will reduce magnetic attraction.

Do not drill, cut or machine ferrite magnets unless appropriate specialist processes and equipment are used.

Small magnets should be kept away from young children. Keep magnetic products away from pacemakers, medical implants, magnetic storage media and sensitive electronic equipment where magnetic interference may be a concern.