Neodymium Block Magnet – 25mm x 12.5mm x 6.5mm | N38

The Neodymium Block Magnet – 25mm x 12.5mm x 6.5mm | N38 is a compact rectangular rare earth permanent magnet measuring 25mm long x 12.5mm wide x 6.5mm thick. Manufactured from N38 grade Neodymium Iron Boron (NdFeB), this versatile block magnet provides strong magnetic performance relative to its size and is suitable for engineering, manufacturing, product assembly, positioning, fixtures, machinery, research and custom magnetic applications.

Its 25mm x 12.5mm rectangular footprint has a 2:1 length-to-width ratio, while the 6.5mm thickness provides a substantial magnetic profile without requiring the installation space of a much larger magnet. This practical geometry makes it suitable for integration into rectangular recesses, housings, mechanical components and custom assemblies.

Also known as an N38 neodymium block magnet, rare earth rectangular magnet, NdFeB block magnet, neodymium bar magnet or rectangular rare earth magnet, this product provides permanent magnetic attraction without electricity, batteries or charging.

Key Features

• Length: 25mm
• Width: 12.5mm
• Thickness: 6.5mm
• Dimensions: 25mm x 12.5mm x 6.5mm
• Shape: Rectangular block
• Material: Neodymium Iron Boron (NdFeB)
• Magnetic grade: N38
• Magnet type: Rare earth permanent magnet
• Compact rectangular geometry
• 2:1 length-to-width ratio
• Strong magnetic performance relative to size
• Suitable for engineering and manufacturing
• Useful for product assemblies
• Suitable for fixtures and jigs
• Useful for positioning and alignment
• Suitable for machinery and equipment
• Ideal for prototypes and OEM magnetic assemblies
• Permanent magnetic operation
• No electricity, batteries or charging required

Common Applications

• Engineering
• Manufacturing
• Industrial equipment
• Machinery
• Product assemblies
• Magnetic positioning
• Component alignment
• Fixtures and jigs
• Equipment housings
• Magnetic closures
• Removable components
• Mechanical assemblies
• Displays
• Furniture and cabinetry
• Research and development
• Laboratory equipment
• Prototype devices
• OEM products

25mm x 12.5mm x 6.5mm Rectangular Magnet

This N38 neodymium magnet measures 25mm long x 12.5mm wide x 6.5mm thick.

Its rectangular proportions make it suitable for installations where a block-shaped magnetic component fits more effectively than a round disc or cylinder magnet.

Potential integration locations include:

• Rectangular recesses
• Product housings
• Machinery
• Equipment
• Fixtures
• Custom brackets
• Mechanical assemblies
• Prototype components

The stated dimensions describe the magnet's physical geometry and do not represent its pull force, holding capacity or safe working load.

N38 Grade Neodymium Magnet

This block magnet is manufactured from N38 grade Neodymium Iron Boron, a high-performance permanent magnetic material from the rare earth magnet family.

N38 provides high magnetic energy density compared with conventional ferrite materials, allowing useful magnetic performance to be achieved from relatively compact dimensions.

This makes N38 suitable for applications where:

• Installation space is limited
• Compact magnet dimensions are preferred
• Strong permanent magnetic attraction is required
• A rectangular magnetic component is needed
• Magnetic performance relative to size is important

What Does N38 Mean?

N38 identifies the magnetic grade of the Neodymium Iron Boron material.

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

The N38 designation does not mean this magnet has a 38kg pull force.

N38 also does not directly specify:

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

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

Engineering and Manufacturing Applications

The compact rectangular geometry makes this N38 magnet suitable for a broad range of engineering and manufacturing applications.

Potential uses include:

• Component positioning
• Product assembly
• Magnetic retention
• Alignment systems
• Removable components
• Machinery
• Equipment housings
• Production fixtures
• Prototype mechanisms
• Custom magnetic systems

For performance-critical applications, the magnet should be tested under the actual mechanical and magnetic conditions in which it will operate.

Fixtures and Jigs

Neodymium block magnets can be incorporated into appropriately designed fixtures and jigs to assist with:

• Component locating
• Repeatable positioning
• Assembly alignment
• Temporary retention
• Inspection fixtures
• Prototype tooling

Magnetic attraction should not replace suitable mechanical clamping or engineered retention where unexpected component movement could create a hazard.

Magnetic Closures and Retention

This rectangular magnet may also be useful in magnetic closure and retention systems.

Potential applications include:

• Panels
• Covers
• Cases
• Cabinets
• Furniture
• Equipment housings
• Removable components

Closure performance depends on the magnetic circuit, target material, air gap, alignment and mechanical leverage.

Where accidental opening could create a safety risk, a suitable mechanical restraint should also be used.

Magnetisation Direction

Rectangular neodymium magnets can be manufactured with different magnetisation configurations.

A 25mm x 12.5mm x 6.5mm block magnet could potentially be magnetised:

• Through its 6.5mm thickness
• Across its 12.5mm width
• Along its 25mm length
• In another specialised configuration

The actual magnetisation direction and pole orientation have not been supplied and should not be assumed from the magnet's shape.

Confirm this specification where pole position or magnetic field orientation is important.

Magnetic Performance

Practical magnetic performance depends on more than the N38 material grade.

Important factors include:

• N38 material properties
• Magnet dimensions
• Magnetisation direction
• Pole configuration
• Magnetic circuit design
• Target steel composition
• Target steel thickness
• Contact area
• Surface condition
• Air gaps
• Load direction
• Mechanical leverage
• Installation geometry

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

These values should not be inferred from the N38 grade or dimensions alone.

Direct Pull vs Shear Force

Magnetic holding performance changes depending on the direction in which the load acts.

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

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

Shear performance is influenced by factors including:

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

A magnet that performs strongly in direct pull may provide considerably different practical holding performance when subjected to sliding or leverage.

Air Gaps and Magnetic Attraction

Even small gaps between a neodymium magnet and its target can reduce magnetic attraction.

Potential sources of separation include:

• Paint
• Powder coating
• Adhesive
• Plastic
• Protective films
• Product housings
• Dirt
• Rust
• Mechanical clearance

Where maximum magnetic attraction is required, unnecessary separation between the magnet and target should generally be minimised.

Target Steel Thickness

The target steel forms part of the magnetic circuit.

Performance can vary depending on:

• Steel composition
• Steel thickness
• Target dimensions
• Available contact area
• Surface condition

Thin steel may become magnetically saturated and may not provide the same performance as a suitably thick ferromagnetic target.

Testing against the actual target material is recommended where holding performance is important.

Bonding the Magnet

Adhesive bonding is one method of installing a neodymium block magnet into a product or housing.

Before bonding:

• Confirm the required magnetic orientation
• Check polarity where multiple magnets are used
• Clean both bonding surfaces
• Remove grease, dust and contamination
• Select an adhesive compatible with the actual magnet finish
• Provide suitable dimensional clearance
• Avoid force-fitting
• Allow the adhesive to cure according to its instructions

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

Confirm Polarity Before Installation

When magnets are installed in pairs or multiple-component assemblies, polarity should be checked before permanent bonding.

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

This is particularly important for:

• Magnetic closures
• Paired assemblies
• Alignment systems
• Production fixtures
• OEM products
• Repetitive manufacturing

A consistent polarity-checking process can help prevent assembly errors.

Avoid Force-Fitting

Neodymium Iron Boron is hard but brittle.

Do not force the magnet into an undersized recess or housing.

Excessive pressure can cause:

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

Provide suitable mechanical clearance and use an appropriate retention method.

Do Not Machine Neodymium Magnets

Finished neodymium magnets should not be modified using conventional workshop methods.

Avoid:

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

These processes can fracture the brittle magnetic material and damage any protective coating.

If a different size or geometry is required, select a magnet manufactured to the required dimensions.

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 can also be weakly magnetic or non-magnetic.

Test the intended target where magnetic compatibility is important.

N38 Neodymium vs Ferrite Magnets

N38 neodymium and ferrite magnets provide different characteristics.

N38 neodymium magnets generally offer:

• Higher magnetic performance relative to size
• High magnetic energy density
• Compact dimensions
• Advantages in space-constrained designs

Ferrite magnets generally offer:

• Lower cost
• Good natural corrosion resistance
• Good resistance to demagnetisation
• Suitability where larger magnet dimensions are acceptable

N38 neodymium is particularly useful where compact dimensions and high magnetic performance relative to size are important.

Permanent Magnetic Operation

This N38 block magnet is a permanent magnet.

It requires:

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

Its magnetic field remains continuously active during normal use.

Technical Specifications

• Product Name: Neodymium Block Magnet – 25mm x 12.5mm x 6.5mm | N38
• Product Type: Neodymium Block / Rectangular Magnet
• Alternative Names: N38 Neodymium Block Magnet, Rare Earth Block Magnet, NdFeB Rectangular Magnet, Neodymium Bar Magnet, Rare Earth Rectangular Magnet
• Length: 25mm
• Width: 12.5mm
• Thickness: 6.5mm
• Dimensions: 25mm x 12.5mm x 6.5mm
• Shape: Rectangular Block
• Magnetic Material: Neodymium Iron Boron (NdFeB)
• Magnetic Grade: N38
• Magnet Type: Rare Earth Permanent Magnet
• Magnetic Operation: Permanent
• Power Required: None
• Compatible Targets: Suitable ferromagnetic iron and steel
• Primary Functions: Magnetic attraction, holding, positioning, alignment and product integration
• Typical Applications: Engineering, manufacturing, machinery, fixtures, product assemblies, equipment, research, prototypes and OEM products

Safety and Handling

This N38 neodymium block magnet should be handled carefully around other magnets and ferromagnetic objects.

Neodymium magnets can attract rapidly to steel objects or other magnets, creating potential:

• Pinch injuries
• Magnet collisions
• Chipping
• Cracking
• Fragmentation

Neodymium is a hard but brittle material. Do not allow the magnet to snap uncontrollably against another magnet or steel surface.

Keep permanent magnets an appropriate distance from:

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

Keep magnets securely away from babies and children.

Please Note

This product is an N38 Neodymium Block Magnet measuring 25mm long x 12.5mm wide x 6.5mm thick, manufactured from Neodymium Iron Boron (NdFeB) rare earth magnetic material.

The N38 designation identifies the magnetic material grade and does not mean the magnet has a 38kg 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 N38 material properties, magnetisation configuration, magnetic circuit, target material, target steel thickness, available contact area, surface condition, air gaps, load direction, mechanical leverage and installation geometry.

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

The stated 25mm x 12.5mm x 6.5mm dimensions describe the physical geometry of the magnet and do not represent its pull force, holding capacity or safe working load.

This magnet is not certified lifting equipment and should not be used for overhead or safety-critical lifting.