Ferrite Disc Magnet – 15mm x 4mm | Capped

The Ferrite Disc Magnet – 15mm x 4mm | Capped is a compact ceramic permanent magnet measuring 15mm in diameter x 4mm thick and featuring a capped construction. Manufactured from ferrite magnetic material, this round magnet provides an economical permanent magnetic solution for holding, positioning, closures, displays, craft, manufacturing, educational and general-purpose applications.

Also known as a ceramic disc magnet, capped ferrite magnet or round ferrite magnet, ferrite magnets are valued for their good resistance to demagnetisation, natural corrosion resistance and cost-effective performance. The compact 15mm x 4mm disc profile makes this magnet suitable for incorporation into products, fixtures and assemblies where a small permanent magnet is required.

The capped design distinguishes this product from a standard exposed ferrite disc magnet. The exact cap material and construction have not been supplied and should therefore be confirmed where these characteristics are important to the application.

Key Features

• 15mm diameter x 4mm thickness
• Ferrite / ceramic permanent magnet
• Capped construction
• Compact round disc shape
• Cost-effective permanent magnetic material
• Good resistance to demagnetisation
• Good natural corrosion resistance
• Suitable for holding and positioning applications
• Useful for product and custom magnetic assemblies
• Permanent magnetic operation
• No electricity or batteries required
• Suitable for manufacturing, craft, displays and educational applications

Common Applications

• Product assemblies
• Magnetic closures
• Holding and positioning
• Displays and signage
• Furniture and cabinetry
• Craft and hobby projects
• Educational applications
• School science projects
• Manufacturing
• Fixtures
• Prototyping
• General-purpose magnetic applications

Compact 15mm x 4mm Disc Magnet

This capped ferrite magnet measures 15mm in diameter x 4mm thick, providing a compact magnetic component for applications where installation space is limited.

Its round shape can be useful for incorporation into:

• Product housings
• Circular recesses
• Furniture components
• Display assemblies
• Closures
• Fixtures
• Craft products
• Custom manufactured components

The 15mm x 4mm dimensions describe the physical size of the product and should not be interpreted as a magnetic pull-force rating.

Capped Ferrite Magnet Design

Unlike a standard exposed ferrite disc, this product features a capped construction.

Depending on the design of a capped magnetic assembly, a cap may provide mechanical protection, assist with installation or form part of the magnetic circuit. However, the exact cap material and configuration for this product have not been supplied.

For this reason, no assumptions should be made regarding:

• Cap material
• Cap thickness
• Surface finish
• Protective properties
• Magnetic field enhancement
• Specific mounting method

Where these characteristics are important, they should be confirmed before installation.

What Is a Ferrite Magnet?

Ferrite magnets, also known as ceramic magnets, are permanent magnets manufactured primarily using iron oxide combined with ceramic materials.

Ferrite is widely used because it provides a practical combination of:

• Economical magnetic performance
• Good resistance to demagnetisation
• Natural resistance to corrosion
• Long-term permanent magnetic operation
• Broad general-purpose usability

These characteristics make ferrite magnets suitable for industrial, commercial, educational and consumer applications.

Ferrite vs Neodymium Magnets

Ferrite and Neodymium Iron Boron (NdFeB) are both permanent magnetic materials but offer different performance characteristics.

Ferrite magnets are generally:

• More economical
• Naturally resistant to corrosion
• Suitable for many general-purpose applications
• Less powerful relative to their size than neodymium magnets

Neodymium magnets generally provide substantially greater magnetic strength relative to their physical dimensions.

Ferrite can therefore be a practical choice where extreme magnetic strength or minimum magnet size is not the primary requirement.

Magnetic Holding Performance

Actual magnetic performance depends on the complete application.

Factors that can affect holding strength include:

• Ferrite grade
• Magnet dimensions
• Capped construction
• Magnetisation direction
• Target steel thickness
• Steel composition
• Available contact area
• Surface flatness
• Air gaps
• Paint and coatings
• Adhesive layers
• Load direction

No specific pull force or Gauss rating has been supplied for this product, so magnetic performance should not be inferred solely from its 15mm x 4mm dimensions.

Magnetic Attraction Decreases with Distance

Magnetic attraction generally becomes weaker as the distance between the magnet and ferromagnetic target increases.

Physical layers that may reduce attraction include:

• Paint
• Plastic
• Adhesive
• Paper
• Fabric
• Protective coatings
• Dirt
• Surface irregularities

Where the capped magnetic face is intended to contact steel, close and flat contact will generally provide better magnetic performance than an installation with a substantial air gap.

Direct Pull vs Shear Force

Magnetic holding performance also varies according to the direction of the applied load.

Direct pull occurs when force attempts to separate the magnet perpendicular to the target steel.

Shear force occurs when a load acts parallel to the surface and encourages the magnetic assembly to slide.

Practical vertical or sideways holding capacity may therefore be lower than direct-pull performance.

Compatible Target Materials

Ferrite magnets attract ferromagnetic iron and compatible steels.

Suitable target materials may include:

• Mild steel
• Iron
• Magnetic steel sheet
• Ferromagnetic components

They will not effectively attract:

• Aluminium
• Copper
• Brass
• Plastic
• Timber
• Glass

Many stainless steel grades may also provide weak or negligible magnetic attraction and should be tested before use.

Permanent Magnetic Operation

This capped ferrite disc uses a permanent magnetic system, requiring no external power source.

It requires:

• No electricity
• No batteries
• No charging
• No electrical wiring

This makes it suitable for passive magnetic holding, positioning and product applications.

Technical Specifications

• Product Type: Capped Ferrite Disc Magnet
• Alternative Names: Capped Ceramic Disc Magnet, Ferrite Disc Magnet, Round Ferrite Magnet, Ceramic Permanent Magnet
• Diameter: 15mm
• Thickness: 4mm
• Shape: Disc / Round
• Construction: Capped
• Magnetic Material: Ferrite / Ceramic
• Magnet Type: Permanent Magnet
• Magnetic Operation: Permanent
• Power Required: None
• Target Material: Compatible ferromagnetic iron and steel
• Primary Functions: Magnetic holding, positioning and integration into magnetic assemblies
• Typical Applications: Manufacturing, closures, displays, furniture, craft, education and general-purpose magnetic applications

Manufacturing and Product Applications

The compact dimensions and capped design make this ferrite magnet suitable for incorporation into a variety of products and assemblies.

Potential users include:

• Product manufacturers
• Furniture manufacturers
• Display manufacturers
• Fabricators
• Designers
• Prototype developers
• Educational suppliers
• Craft and hobby users
• OEM manufacturers

For engineered applications, the complete magnetic assembly should be tested under realistic operating conditions.

Handling Ferrite Magnets

Ferrite is a hard and brittle ceramic magnetic material.

Ferrite magnets can chip, crack or fracture if they:

• Are dropped onto hard surfaces
• Strike another magnet
• Snap forcefully onto steel
• Experience excessive mechanical stress

Avoid drilling, cutting or machining ferrite magnetic material using conventional methods.

Although the capped construction may cover part of the magnet, it should not be assumed to make the underlying ferrite resistant to excessive impact.

Please Note

This product is a Capped Ferrite Disc Magnet measuring 15mm in diameter x 4mm thick.

No specific ferrite grade, cap material, cap dimensions, surface finish, pull force, Gauss rating, magnetisation direction, dimensional tolerance or maximum operating temperature has been supplied and these specifications should not be assumed.

The purpose and magnetic effect of the cap depend on its material and construction. No claim is made that the cap increases magnetic strength unless this has been specifically verified for the product.

Actual magnetic performance depends on the magnet grade and geometry, capped construction, target material, steel thickness, available contact area, air gaps, surface condition and load direction.

Ferrite is a hard and brittle ceramic magnetic material and may chip or fracture if subjected to impact.

Keep magnets away from small children and sensitive magnetic or electronic equipment.