Neodymium Disc Magnet – 3mm x 3mm

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

Also known as a mini neodymium magnet, rare earth disc magnet, NdFeB disc magnet, small round magnet or neodymium button magnet, its tiny 3mm x 3mm dimensions make it particularly useful where installation space is extremely limited. It can be incorporated into small product housings, mechanisms, closures, models and custom magnetic assemblies.

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

Key Features

• 3mm diameter x 3mm thickness
• Neodymium Iron Boron (NdFeB)
• High-performance rare earth permanent magnet
• Miniature round / disc shape
• Compact 3mm x 3mm dimensions
• High magnetic performance relative to size
• Suitable for space-restricted applications
• Useful for miniature holding and positioning
• Suitable for sensing and product integration
• Can be bonded into compatible small recesses
• Permanent magnetic operation
• No electricity or batteries required
• Suitable for precision, custom and OEM assemblies

Common Applications

• Miniature magnetic assemblies
• Sensors and switches
• Electronics assemblies
• Precision engineering
• Small magnetic closures
• Models and miniatures
• Craft and hobby projects
• Product manufacturing
• Prototypes
• Research and development
• Educational projects
• Custom magnetic systems
• OEM products

Miniature 3mm x 3mm Neodymium Magnet

This neodymium magnet measures just 3mm in diameter x 3mm thick, providing a very small permanent magnetic component for applications where available space is restricted.

Potential installation locations include:

• Small circular recesses
• Miniature product housings
• Sensor assemblies
• Models
• Compact mechanisms
• Small closures
• Prototype equipment
• Custom manufactured components

The 3mm 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 allows useful magnetic functionality to be incorporated into components only a few millimetres in size.

This makes miniature neodymium magnets particularly useful for:

• Precision equipment
• Sensors
• Electronics
• Models
• Compact closures
• Product manufacturing
• Prototypes
• Custom magnetic mechanisms

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

Small Magnet for Precision Applications

The compact size of this 3mm x 3mm disc makes it suitable for applications where a conventional larger magnet cannot be accommodated.

Small neodymium magnets can be integrated into:

• Precision mechanisms
• Miniature fixtures
• Magnetic catches
• Positioning systems
• Models
• Sensors
• Small product assemblies
• Custom prototypes

For engineered applications, the magnet should be assessed as part of the complete magnetic and mechanical system.

Magnetisation Direction

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

Disc magnets can be manufactured with different magnetic pole orientations. Magnetisation direction determines the location of the north and south poles 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
• 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 the magnet's 3mm x 3mm dimensions.

Magnetic Attraction Decreases with Distance

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

This is particularly important with miniature magnets, as even a relatively thin non-magnetic layer can represent a significant air gap compared with the magnet's dimensions.

Air gaps may be introduced by:

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

Where attraction to steel is required, close contact with a clean, flat and suitably thick ferromagnetic target generally provides the strongest practical performance.

Bonding Small Neodymium Disc Magnets

Miniature neodymium magnets are often bonded into small product housings and recesses.

Before bonding:

• Clean the magnet and substrate
• Choose an adhesive compatible with both surfaces
• Apply adhesive carefully to avoid excessive buildup
• Follow the adhesive manufacturer's instructions
• Avoid curing temperatures beyond the magnet's permitted operating conditions
• Allow the adhesive to cure fully before loading the assembly

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 Magnets

Both neodymium and ferrite are permanent magnetic materials, but neodymium generally offers significantly higher magnetic performance relative to its physical size.

Neodymium magnets typically provide:

• High magnetic strength relative to size
• Very compact dimensions
• Suitability for miniature and precision 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

For a component measuring only 3mm x 3mm, neodymium can be particularly useful where compact size is an important design requirement.

Permanent Magnetic Operation

This NdFeB disc is a permanent magnet, requiring no external power 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: Mini Neodymium Magnet, Rare Earth Disc Magnet, NdFeB Disc Magnet, Small Round Magnet, Neodymium Button Magnet
• Diameter: 3mm
• Thickness: 3mm
• Shape: Disc / Round
• Magnetic Material: Neodymium Iron Boron (NdFeB)
• Magnet Type: Rare Earth Permanent Magnet
• Magnetic Operation: Permanent
• Power Required: None
• Target Material: Compatible ferromagnetic iron and steel
• Primary Functions: Magnetic holding, positioning, sensing and integration into miniature magnetic assemblies
• Typical Applications: Precision engineering, sensors, electronics, models, craft, prototypes and OEM products

Precision, Miniature and OEM Applications

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

Potential users include:

• Engineers
• Product designers
• Electronics manufacturers
• Sensor manufacturers
• Model makers
• Hobbyists
• Prototype developers
• Research laboratories
• OEM manufacturers

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

Handling Miniature Neodymium Magnets

Despite their small size, neodymium magnets should be handled carefully.

NdFeB magnetic material is hard and brittle and may chip, crack or fracture if magnets:

• Snap forcefully together
• Strike steel surfaces
• Are crushed
• Experience excessive mechanical stress

Do not drill, cut or machine neodymium magnets using conventional methods.

Because this magnet is extremely small, particular care should also be taken to prevent it from becoming lost or accidentally ingested.

Please Note

This product is a Neodymium Disc Magnet measuring 3mm 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 the magnetic grade, magnetisation direction, target steel thickness and composition, 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.