Neodymium Cylinder Magnet – 2.5mm x 2.5mm | N48 | Pack of 100pcs

The Neodymium Cylinder Magnet – 2.5mm x 2.5mm | N48 | Pack of 100pcs is a bulk pack of 100 miniature rare earth permanent magnets, each measuring 2.5mm in diameter x 2.5mm long. Manufactured from high-performance N48 grade Neodymium Iron Boron (NdFeB), these tiny cylindrical magnets provide high magnetic energy density in an extremely compact format.

With an equal 2.5mm diameter and 2.5mm length, each magnet has a balanced 1:1 cylindrical profile that can be incorporated into very small housings, components and product assemblies. The 100-piece pack is particularly useful for electronics, sensors, miniature mechanisms, precision equipment, models, prototypes, research, manufacturing and OEM production where multiple identical magnets are required.

Their compact dimensions make these N48 cylinder magnets useful where installation space is limited and a larger magnetic component would be impractical. As permanent magnets, they provide continuous magnetic operation without electricity, batteries or charging.

Also known as 2.5mm neodymium cylinder magnets, N48 micro magnets, miniature rare earth magnets, tiny NdFeB cylinders, mini rod magnets or precision neodymium magnets, these components are suitable for a wide range of compact magnetic applications.

Key Features

• Pack quantity: 100 pieces
• Diameter: 2.5mm each
• Length: 2.5mm each
• Dimensions: 2.5mm diameter x 2.5mm long
• Shape: Cylinder
• Material: Neodymium Iron Boron (NdFeB)
• Magnetic grade: N48
• Magnet type: Rare earth permanent magnet
• Equal diameter and length
• Compact 1:1 cylindrical geometry
• High magnetic performance relative to size
• Suitable for miniature assemblies
• Useful for electronics and sensor applications
• Suitable for precision mechanisms
• Convenient 100-piece bulk pack
• Useful for prototypes and product development
• Suitable for repetitive manufacturing and OEM assembly
• Permanent magnetic operation
• No electricity, batteries or charging required

Common Applications

• Miniature product assemblies
• Electronics
• Sensors
• Instrumentation
• Hall-effect sensors
• Reed switches
• Position detection
• Proximity sensing
• Magnetic switching
• Precision mechanisms
• Small magnetic closures
• Models and miniatures
• Scientific equipment
• Laboratory projects
• Research and development
• Prototype devices
• Manufacturing
• OEM products
• Custom magnetic assemblies

Pack of 100 Miniature N48 Magnets

This product contains 100 individual N48 neodymium cylinder magnets, each measuring 2.5mm diameter x 2.5mm long.

The bulk pack is particularly convenient for applications requiring multiple identical magnetic components, including:

• Batch assembly
• Electronics production
• Prototype development
• Sensor assemblies
• Model making
• Laboratory testing
• Small production runs
• Product development
• OEM manufacturing

When multiple magnets are being installed into identical products, establishing a consistent polarity and orientation procedure can help reduce assembly errors.

Compact 2.5mm x 2.5mm Cylinder Design

Each magnet has an equal 2.5mm diameter and 2.5mm length, creating a compact cylindrical shape with a 1:1 dimensional ratio.

This miniature geometry can be useful where:

• Installation space is extremely limited
• A discreet magnetic component is required
• The magnet needs to fit inside a small cylindrical recess
• Product miniaturisation is important
• Multiple magnets need to be incorporated into a compact assembly
• A small permanent magnetic source is required

The stated dimensions describe the physical size of each magnet and do not represent pull force or holding capacity.

N48 Grade Neodymium

These miniature cylinders are manufactured from N48 grade Neodymium Iron Boron, a high-performance rare earth permanent magnet material.

N48 provides high magnetic energy density, making it particularly useful where magnetic performance needs to be achieved from compact magnet dimensions.

Potential advantages include:

• High magnetic performance relative to volume
• Small physical dimensions
• Suitability for precision components
• Integration into space-constrained products
• Permanent magnetic operation

What Does N48 Mean?

N48 identifies the magnetic grade of the Neodymium Iron Boron material.

The numerical designation relates to the material's maximum energy product and is used to classify the magnetic performance potential of different NdFeB grades.

The N48 designation does not mean each magnet has a 48kg pull force.

N48 also does not directly specify:

• Pull force
• Surface Gauss
• Holding capacity
• Safe working load
• Magnetisation direction
• Pole configuration
• Maximum operating temperature

These characteristics depend on the finished magnet and the complete magnetic circuit.

Electronics and Sensor Applications

Miniature neodymium cylinder magnets can be useful in compact electronic and sensing systems.

Potential applications include:

• Hall-effect sensors
• Reed switches
• Position sensors
• Proximity detection
• Magnetic switching
• Movement detection
• Miniature instrumentation

Sensor performance can depend on:

• Magnetisation direction
• Pole orientation
• Magnet-to-sensor distance
• Sensor sensitivity
• Installation geometry
• Surrounding magnetic materials

The magnetisation direction of these magnets has not been supplied and should be confirmed where magnetic field orientation is important.

Miniature Product Assemblies

The extremely compact dimensions make these magnets useful for integration into small components and custom products.

Potential applications include:

• Miniature mechanisms
• Small magnetic closures
• Models
• Precision assemblies
• Electronic products
• Removable components
• Prototype devices
• Custom manufactured products

Because each magnet measures only 2.5mm x 2.5mm, secure retention is particularly important where the finished product may be accessible to children.

Magnetisation Direction

Cylinder magnets can be manufactured with different magnetic orientations.

A 2.5mm diameter x 2.5mm long cylinder magnet could potentially be:

• Axially magnetised through its 2.5mm length
• Diametrically magnetised across its 2.5mm diameter
• Manufactured with another specialised magnetic configuration

The actual magnetisation direction and pole configuration have not been supplied and should not be assumed from the cylinder shape.

Confirm this specification where field direction or pole position is important.

Magnetic Performance

Practical magnetic performance depends on factors including:

• N48 material properties
• Magnet dimensions
• Magnetisation direction
• Pole configuration
• Magnetic circuit
• Target material
• Target steel thickness
• Contact area
• Surface condition
• Air gaps
• Load direction
• Installation geometry

No specific pull force or magnetic flux density in Gauss has been supplied.

These values should not be inferred from the N48 grade alone.

Air Gaps and Miniature Magnets

Even a small physical separation between a magnet and its target can significantly reduce magnetic attraction.

This is particularly relevant with a magnet measuring only 2.5mm x 2.5mm, because a small air gap can represent a significant proportion of the magnet's overall dimensions.

Potential sources of separation include:

• Adhesive
• Paint
• Plastic housings
• Protective films
• Product casings
• Fabric
• Paper
• Mechanical clearance

Where maximum magnetic interaction is required, unnecessary separation should be minimised.

Direct Pull vs Shear

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

Direct pull occurs when the magnet is separated perpendicular to the target surface.

Shear loading occurs when the magnet is encouraged to slide parallel to the target.

Shear performance can be influenced by:

• Surface friction
• Surface coatings
• Air gaps
• Installation orientation
• Vibration
• Mechanical leverage

For performance-critical products, test the complete assembly under realistic operating conditions.

Bonding 2.5mm Neodymium Magnets

Adhesive bonding may be suitable for incorporating these miniature magnets into products and assemblies.

Before bonding:

• Confirm polarity
• Confirm magnetic orientation
• Clean the bonding surfaces
• Remove grease, dust and contamination
• Select an adhesive suitable for the actual magnet finish
• Provide appropriate dimensional clearance
• Avoid force-fitting
• Allow the adhesive to cure correctly

The exact coating or plating has not been supplied, so adhesive compatibility with the actual magnet surface should be confirmed.

Polarity in 100-Piece Production Packs

When installing magnets in quantity, polarity should be checked before permanent assembly.

Incorrect orientation can cause components intended to attract to repel instead.

A consistent polarity-checking process is particularly useful for:

• Batch manufacturing
• Sensor assemblies
• Magnetic closures
• Paired magnetic components
• Repetitive product assembly
• OEM production

Avoid Force-Fitting

Neodymium Iron Boron is hard but brittle.

Do not force these miniature magnets into undersized recesses, holes or housings.

Excessive pressure can cause:

• Chipping
• Cracking
• Fracturing
• Damage to the protective surface finish

Provide suitable dimensional clearance and use an appropriate retention method.

Do Not Machine Neodymium Magnets

These miniature magnets should not be mechanically modified.

Avoid:

• Drilling
• Cutting
• Grinding
• Filing
• Crushing
• Machining

Their extremely small dimensions and brittle NdFeB construction make mechanical modification impractical and likely to damage the magnets.

Compatible Target Materials

Neodymium magnets attract suitable ferromagnetic materials, including:

• Mild steel
• Iron
• Magnetic steel
• Compatible ferromagnetic components

They do not effectively attract inherently non-magnetic materials such as:

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

Many stainless steel grades may also be weakly magnetic or non-magnetic.

Test the intended target where magnetic compatibility is important.

N48 Neodymium vs Ferrite Magnets

N48 neodymium provides considerably higher magnetic energy density than conventional ferrite magnetic material.

N48 neodymium is particularly useful for:

• Miniature components
• Space-constrained assemblies
• Electronics
• Sensors
• Precision mechanisms
• High magnetic performance relative to size

Ferrite magnets may be preferred for:

• More economical applications
• Larger magnetic components
• Applications benefiting from good natural corrosion resistance
• Situations where lower magnetic performance relative to size is acceptable

For miniature components such as these 2.5mm x 2.5mm cylinders, high-energy neodymium material provides significant advantages where compact dimensions are required.

Permanent Magnetic Operation

These N48 cylinder magnets are permanent magnets.

They require:

• No electricity
• No batteries
• No charging
• No external power supply

Their magnetic fields remain continuously active during normal use.

Technical Specifications

• Product Name: Neodymium Cylinder Magnet – 2.5mm x 2.5mm | N48 | Pack of 100pcs
• Product Type: Miniature Neodymium Cylinder Magnet
• Alternative Names: 2.5mm Neodymium Cylinder Magnet, N48 Micro Magnet, Miniature Rare Earth Magnet, Tiny NdFeB Cylinder Magnet, Mini Neodymium Rod Magnet
• Pack Quantity: 100 pieces
• Diameter: 2.5mm each
• Length: 2.5mm each
• Dimensions: 2.5mm diameter x 2.5mm long
• Shape: Cylinder
• Magnetic Material: Neodymium Iron Boron (NdFeB)
• Magnetic Grade: N48
• Magnet Type: Rare Earth Permanent Magnet
• Magnetic Operation: Permanent
• Power Required: None
• Compatible Targets: Suitable ferromagnetic iron and steel
• Primary Functions: Magnetic attraction, positioning, alignment, sensing, switching, retention and product integration
• Typical Applications: Electronics, sensors, miniature assemblies, precision mechanisms, models, manufacturing, research, prototypes and OEM products

Safety and Handling

These 2.5mm x 2.5mm neodymium magnets present a serious ingestion hazard due to their extremely small size.

Keep all magnets securely away from babies and children.

If multiple magnets are swallowed, they can attract to each other through body tissue and cause severe internal injuries. Suspected magnet ingestion requires urgent medical attention.

If these magnets are incorporated into another product, they should be securely retained so they cannot become detached during normal or foreseeable use.

Neodymium magnets are brittle and can chip or fracture if allowed to collide uncontrollably with other magnets or ferromagnetic objects.

Permanent magnets should also be kept an appropriate distance from:

• Pacemakers and implanted medical devices
• Magnetic cards
• Magnetic storage media
• Magnetically sensitive instruments
• Sensitive electronic equipment

Please Note

This product contains 100 individual N48 Neodymium Cylinder Magnets, each measuring 2.5mm in diameter x 2.5mm long.

The N48 designation identifies the Neodymium Iron Boron magnetic material grade and does not mean each magnet has a 48kg pull force.

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

Actual magnetic performance depends on the N48 material properties, magnetisation configuration, magnetic circuit, target material, target steel thickness, contact area, surface condition, air gaps, load direction and installation geometry.

Because each magnet measures only 2.5mm x 2.5mm, these magnets are a serious swallowing hazard and must be kept securely away from babies and children. Where incorporated into another product, suitable measures should be taken to prevent the magnets from becoming detached.

Neodymium is a hard and brittle magnetic material. Avoid impact, force-fitting, drilling, cutting, grinding or machining.

The stated 2.5mm diameter x 2.5mm length describes the physical dimensions of each magnet and does not represent pull force, holding capacity or safe working load.

These magnets are not certified lifting equipment and should not be used for overhead or safety-critical lifting.