Neodymium Disc Magnet – 7mm x 3mm

The Neodymium Disc Magnet – 7mm x 3mm is a compact rare earth permanent magnet measuring 7mm in diameter x 3mm thick. Manufactured from Neodymium Iron Boron (NdFeB), this small round magnet provides high magnetic performance relative to its size and is suitable for precision engineering, product assemblies, magnetic closures, sensors, electronics, models, craft, prototyping and OEM applications.

Also known as a rare earth disc magnet, NdFeB disc magnet, small round neodymium magnet or neodymium button magnet, its compact 7mm diameter and 3mm thickness make it particularly useful where a small permanent magnetic component needs to be integrated into a limited space.

As a permanent magnet, this 7mm x 3mm neodymium disc requires no electricity, batteries or charging to maintain its magnetic field.

Key Features

• 7mm diameter x 3mm thickness
• Neodymium Iron Boron (NdFeB)
• High-performance rare earth permanent magnet
• Compact round / disc shape
• High magnetic performance relative to size
• Suitable for space-restricted applications
• Useful for magnetic holding and positioning
• Suitable for small magnetic closures
• Can be integrated into product housings and recesses
• Useful for sensors, models and prototypes
• Permanent magnetic operation
• No electricity or batteries required
• Suitable for custom and OEM magnetic assemblies

Common Applications

• Magnetic closures
• Product assemblies
• Sensors and switches
• Precision engineering
• Electronics
• Models and miniatures
• Craft and hobby projects
• Displays and signage
• Furniture and cabinetry
• Magnetic positioning
• Prototypes
• Research and development
• Custom magnetic systems
• OEM products

Compact 7mm x 3mm Neodymium Disc Magnet

This neodymium magnet measures 7mm in diameter x 3mm thick, providing a compact circular magnetic component for applications where installation space is restricted.

Its small disc shape can be incorporated into:

• Circular recesses
• Product housings
• Small closures
• Sensor assemblies
• Models
• Displays
• Furniture components
• Prototype mechanisms
• Custom manufactured products

The 7mm x 3mm dimensions describe the physical size of the magnet and should not be interpreted as a pull-force or load-capacity rating.

Neodymium Iron Boron Rare Earth Magnet

Neodymium Iron Boron (NdFeB) is one of the strongest commercially available permanent magnetic materials.

Its high magnetic performance relative to volume makes neodymium particularly useful where magnetic functionality needs to fit within a small component or restricted installation space.

Small neodymium disc magnets are commonly used in:

• Product manufacturing
• Sensors
• Electronics
• Magnetic closures
• Fixtures
• Models
• Displays
• Prototypes
• OEM assemblies

The specific NdFeB magnetic grade of this magnet has not been supplied and should not be assumed.

Small Magnet for Closures and Product Assemblies

The compact dimensions of this 7mm x 3mm magnet make it useful for integration into products where a discrete magnetic connection or positioning point is required.

Potential applications include:

• Cabinet and furniture closures
• Boxes and cases
• Display components
• Removable panels
• Models
• Product enclosures
• Locating components
• Custom magnetic connections

For engineered applications, the required magnetic performance should be assessed as part of the complete assembly.

Magnetisation Direction

The magnetisation direction of this 7mm x 3mm disc magnet has not been supplied.

Disc magnets can be manufactured with different magnetic pole orientations. Magnetisation direction determines where the north and south poles are positioned and can significantly affect interaction with other magnets, sensors and ferromagnetic targets.

Where pole orientation is important, the magnetisation direction should be confirmed before installation.

Magnetic Holding Performance

Actual magnetic performance depends on multiple factors, including:

• NdFeB magnetic grade
• Magnetisation direction
• Target steel thickness
• Target steel composition
• Available contact area
• Surface flatness
• Air gaps
• Adhesive layers
• Paint and coatings
• Magnet orientation
• Load direction
• Magnetic circuit design

No specific pull force or Gauss rating has been supplied for this product and these values should not be inferred solely from its 7mm x 3mm dimensions.

Direct Pull vs Shear Force

Magnetic holding performance varies according to load direction.

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

Shear force occurs when the load acts parallel to the target and encourages the magnet to slide.

Practical vertical or sideways holding capacity can therefore be considerably lower than ideal direct-pull performance.

Magnetic Attraction Decreases with Distance

Magnetic attraction decreases rapidly as the distance between a neodymium magnet and its target increases.

Air gaps can be introduced by:

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

This is particularly important for small magnets, where even a thin layer between the magnet and target can represent a significant separation relative to the magnet's dimensions.

Bonding Small Neodymium Disc Magnets

The compact disc shape can make this magnet suitable for bonding into compatible housings and circular recesses.

Before bonding:

• Clean the magnet and substrate
• Select an adhesive compatible with both surfaces
• Follow the adhesive manufacturer's preparation instructions
• Avoid excessive adhesive that may increase the magnetic air gap
• Allow the adhesive to cure fully before loading
• Avoid curing temperatures beyond the magnet's permitted operating conditions

Do not force-fit the magnet into an undersized recess, as NdFeB magnetic material is brittle.

Compatible Target Materials

Neodymium magnets attract ferromagnetic iron and compatible steels.

Suitable targets may include:

• Mild steel
• Iron
• Magnetic steel
• Ferromagnetic fasteners
• Compatible steel 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.

Neodymium vs Ferrite Disc Magnets

Both neodymium and ferrite are permanent magnetic materials, but they offer different characteristics.

Neodymium magnets generally provide:

• Much higher magnetic strength relative to size
• Compact dimensions
• Suitability for precision and miniature assemblies
• Strong performance where installation space is limited

Ferrite magnets are generally:

• More economical
• Naturally corrosion resistant
• Lower in magnetic strength relative to size
• Suitable for many general-purpose applications

A neodymium disc magnet can therefore be particularly useful where compact dimensions and high magnetic performance relative to size are important.

Permanent Magnetic Operation

This NdFeB disc is a permanent magnet, requiring no external power source to maintain its magnetic field.

It requires:

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

Its magnetic field remains continuously active during normal use.

Technical Specifications

• Product Type: Neodymium Disc Magnet
• Alternative Names: Rare Earth Disc Magnet, NdFeB Disc Magnet, Small Round Neodymium Magnet, Neodymium Button Magnet
• Diameter: 7mm
• Thickness: 3mm
• Shape: Disc / Round
• Magnetic Material: Neodymium Iron Boron (NdFeB)
• Magnet Type: Rare Earth Permanent Magnet
• Magnetic Operation: Permanent
• Power Required: None
• Target Materials: Compatible ferromagnetic iron and steel
• Primary Functions: Magnetic holding, positioning, sensing and integration into compact magnetic assemblies
• Typical Applications: Closures, sensors, electronics, engineering, models, craft, prototypes and OEM products

Precision, Manufacturing and OEM Applications

The compact 7mm diameter x 3mm thickness makes this neodymium disc magnet suitable for incorporation into small manufactured products and precision assemblies.

Potential users include:

• Engineers
• Product designers
• Electronics manufacturers
• Sensor manufacturers
• Furniture manufacturers
• Model makers
• Craft businesses
• Research laboratories
• Prototype developers
• OEM manufacturers

For technical applications, magnetic performance should be assessed as part of the complete magnetic circuit and mechanical assembly.

Handling Small Neodymium Magnets

Neodymium magnetic material is hard and brittle and should be handled carefully.

Avoid:

• Allowing magnets to snap together forcefully
• Impact with steel surfaces
• Crushing
• Excessive mechanical stress
• Drilling
• Cutting
• Conventional machining

Small neodymium magnets can still attract one another rapidly and may chip or fracture during uncontrolled collisions.

Please Note

This product is a Neodymium Disc Magnet measuring 7mm in diameter x 3mm thick.

No specific NdFeB magnetic grade, coating or plating, pull force, Gauss rating, magnetisation direction, dimensional tolerance or maximum operating temperature has been supplied and these specifications should not be assumed.

Actual magnetic performance depends on magnetic grade, magnetisation direction, target steel thickness and composition, available contact area, air gaps, surface condition, magnet orientation and load direction.

Neodymium Iron Boron is a hard and brittle magnetic material. Avoid drilling, cutting, machining, impact and uncontrolled collisions.

Small neodymium magnets present a serious ingestion hazard. Keep this product securely away from babies and children. If multiple magnets, or a magnet and another metal object, are swallowed, they can attract through internal tissue and cause severe injury requiring urgent medical attention.

Keep magnets away from pacemakers and other medical implants, magnetic storage media and sensitive electronic equipment.