Neodymium Block Magnet – 25mm x 25mm x 12.5mm

The Neodymium Block Magnet – 25mm x 25mm x 12.5mm is a compact, powerful rare earth permanent magnet measuring 25mm long x 25mm wide x 12.5mm thick. Manufactured from Neodymium Iron Boron (NdFeB), this square block magnet provides high magnetic performance relative to its physical size and is suitable for engineering, manufacturing, fixtures and jigs, machinery, product assemblies, magnetic closures, positioning systems, research, prototypes and custom OEM applications.

With a 25mm x 25mm square face and a thickness equal to half its length and width, this magnet has a substantial block-style profile suitable for integration into appropriately designed housings, recesses and mechanical assemblies.

Also known as a neodymium square magnet, rare earth block magnet, NdFeB block magnet, rectangular neodymium magnet or rare earth square magnet, it provides permanent magnetic operation without electricity, batteries or charging.

Key Features

• Length: 25mm
• Width: 25mm
• Thickness: 12.5mm
• Shape: Square / Block
• Magnetic material: Neodymium Iron Boron (NdFeB)
• Rare earth permanent magnet
• 25mm x 25mm square face
• Substantial 12.5mm thickness
• High magnetic performance relative to size
• Compact geometry for product integration
• Suitable for engineering and manufacturing
• Useful for fixtures, jigs and positioning
• Suitable for machinery and product assemblies
• Useful for magnetic closures
• Suitable for research, prototypes and OEM products
• Permanent magnetic operation
• No electricity, batteries or charging required

Common Applications

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

25mm x 25mm x 12.5mm Square Magnet

This neodymium block magnet measures 25mm long x 25mm wide x 12.5mm thick, giving it a compact square footprint and substantial thickness.

Its geometry can make it suitable for appropriately designed:

• Square recesses
• Product housings
• Fixtures
• Positioning systems
• Magnetic closures
• Machinery
• Mechanical assemblies
• Custom manufactured products

Where the magnet is installed into a housing, provide appropriate dimensional clearance. Neodymium magnetic material is hard and brittle and should not be force-fitted into an undersized recess.

Neodymium Iron Boron Rare Earth Magnet

This block magnet is manufactured from Neodymium Iron Boron (NdFeB), a high-performance rare earth permanent magnetic material.

Neodymium magnets are widely used where substantial magnetic performance is required from relatively compact dimensions.

Common functions include:

• Magnetic attraction
• Holding
• Positioning
• Product integration
• Magnetic closures
• Fixtures
• Mechanical assemblies
• Engineered magnetic systems

The specific neodymium magnetic grade has not been supplied for this product and should not be assumed.

Compact Square Magnetic Profile

The equal 25mm length and 25mm width create a square magnetic face, while the 12.5mm thickness gives the magnet a relatively substantial block profile.

This can be useful for applications requiring:

• A compact square magnetic component
• Integration into a flat-sided housing
• A substantial permanent magnet within limited space
• Repeatable positioning
• Magnetic attraction across a broad square face
• Custom magnetic product assemblies

Physical dimensions alone do not determine magnetic holding force. Magnetic grade, magnetisation direction and the surrounding magnetic circuit are also important.

Engineering and Manufacturing Applications

Neodymium block magnets are widely used as components within custom engineering and manufactured products.

Potential applications include:

• Assembly equipment
• Machinery
• Inspection fixtures
• Positioning systems
• Removable components
• Custom magnetic devices
• Product assemblies
• Prototype equipment

Where unexpected magnetic release could create a hazard, suitable mechanical or secondary retention should be incorporated into the design.

Fixtures, Jigs and Positioning

The compact block geometry can make this magnet useful for appropriately designed fixtures and jigs.

Potential functions include:

• Component positioning
• Temporary holding
• Alignment
• Removable fixture components
• Assembly aids
• Inspection setups
• Prototype tooling

The magnet should not be treated as a structural component. Mechanical loads should be carried by appropriately designed structural parts where required.

Magnetic Closures

This 25mm x 25mm x 12.5mm neodymium block magnet may also be incorporated into magnetic closure systems.

Potential applications include:

• Cabinets
• Furniture
• Access panels
• Boxes
• Displays
• Equipment covers
• Custom enclosures

The magnet may attract compatible ferromagnetic steel or interact with another appropriately oriented permanent magnet.

Where two magnets are used together, confirm polarity and magnetisation orientation before permanent installation.

Magnetisation Direction

Block magnets can be manufactured with different magnetisation configurations.

Depending on manufacture, this magnet could be magnetised:

• Through its 12.5mm thickness
• Across one of its 25mm dimensions
• In another application-specific configuration

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

Confirm the required magnetic configuration for applications involving:

• Magnet-to-magnet attraction
• Sensors
• Magnetic switching
• Magnetic circuits
• Positioning systems
• Engineered assemblies

Magnetic Performance

Practical magnetic performance depends on factors including:

• Neodymium grade
• Magnetisation direction
• Magnet geometry
• Magnetic circuit design
• Target steel composition
• Target steel thickness
• Available contact area
• Surface flatness
• Air gaps
• Paint and coatings
• Load direction
• Mechanical leverage

No specific pull force or magnetic flux density in Gauss has been supplied and these values should not be inferred from the 25mm x 25mm x 12.5mm dimensions alone.

Pull Force vs Safe Working Load

A magnet's specified pull force, where available, is normally measured under defined test conditions. It should not automatically be interpreted as the amount of weight the magnet can safely lift or suspend in a practical installation.

Real-world magnetic holding can be reduced by:

• Thin steel
• Paint
• Powder coating
• Rust
• Dirt
• Uneven surfaces
• Air gaps
• Side loading
• Vibration
• Mechanical leverage

No pull-force specification has been supplied for this magnet.

Its physical dimensions and neodymium construction do not establish a safe working load.

Direct Pull vs Shear Force

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

Direct pull occurs when the magnet is separated perpendicular to a compatible steel surface.

Shear loading occurs when the load encourages the magnet to slide parallel to the surface.

Shear holding can be substantially lower than direct-pull performance and is influenced by:

• Surface friction
• Installation orientation
• Contact area
• Surface coatings
• Mechanical leverage
• Vibration

Test the complete assembly under realistic operating conditions where holding performance is important.

Air Gaps and Surface Contact

Neodymium magnets generally provide their strongest practical attraction when positioned close to clean, flat ferromagnetic steel.

Magnetic performance can be reduced by gaps created by:

• Paint
• Powder coating
• Adhesive
• Plastic
• Protective films
• Dirt
• Rust
• Uneven surfaces
• Mechanical clearance

Minimise unnecessary separation between the magnet and target steel wherever the application permits.

Target Steel Thickness

The properties of the target steel can significantly affect magnetic holding performance.

Important factors include:

• Steel thickness
• Steel composition
• Target dimensions
• Surface flatness
• Magnetic saturation
• Surface coatings

A powerful magnet attached to very thin steel may not achieve the same practical holding performance as it would against a suitable thicker steel target.

For critical applications, test the magnet using the actual target material.

Bonding a Neodymium Block Magnet

This neodymium block magnet may be bonded into an appropriately designed product, housing or recess.

Before bonding:

• Confirm polarity and magnetisation orientation
• Clean all bonding surfaces
• Remove oil, grease and contamination
• Select an adhesive compatible with the actual magnet surface
• Provide appropriate 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.

Avoid Force-Fitting and Machining

Neodymium magnetic material is hard and brittle.

It can chip, crack or fracture when subjected to inappropriate mechanical stress.

Avoid:

• Force-fitting
• Bending
• Prying
• Drilling
• Cutting
• Grinding
• Machining
• Crushing
• Uncontrolled collisions

Design the surrounding housing so that mechanical loads are carried by suitable structural components rather than by the magnet itself.

Compatible Target Materials

Neodymium magnets attract suitable ferromagnetic materials, including:

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

They will 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 and should be tested before relying on magnetic attraction.

Neodymium vs Ferrite Block Magnets

Neodymium and ferrite block magnets offer different characteristics.

Neodymium block magnets generally provide:

• Higher magnetic performance relative to size
• Strong magnetic properties from compact dimensions
• Advantages where installation space is restricted
• Suitability for demanding engineering applications

Ferrite block magnets are generally:

• More economical
• Naturally corrosion resistant
• Resistant to demagnetisation
• Suitable for many general-purpose applications
• Often physically larger where comparable magnetic performance is required

Neodymium can therefore be particularly useful where high magnetic performance within a compact product or assembly is a key requirement.

Permanent Magnetic Operation

This neodymium 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 Type: Neodymium Block Magnet
• Alternative Names: Rare Earth Block Magnet, NdFeB Block Magnet, Neodymium Square Magnet, Rare Earth Square Magnet, Rectangular Neodymium Magnet
• Length: 25mm
• Width: 25mm
• Thickness: 12.5mm
• Shape: Square / Block
• 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 attraction, holding, positioning, closure and product integration
• Typical Applications: Engineering, manufacturing, machinery, fixtures, jigs, product assemblies, closures, research, prototypes and OEM products

Safety and Handling

A neodymium block magnet of this size can attract steel objects and other magnets suddenly and with considerable force.

Keep fingers and skin clear of the space between attracting surfaces to reduce the risk of pinching or crushing injuries.

Neodymium magnets are brittle and may chip, crack or fragment during uncontrolled collisions.

Always:

• Maintain control of the magnet during installation
• Separate magnets carefully
• Keep fingers away from magnetic contact points
• Store magnets with suitable separation
• Use appropriate eye protection where fragmentation is possible

Do not drill, cut, grind, machine or crush neodymium magnets.

Keep powerful magnets an appropriate distance from:

• Pacemakers
• Implanted medical devices
• Magnetic storage media
• Magnetic cards
• Sensitive electronic equipment

Keep neodymium magnets securely away from babies and children.

Please Note

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

No specific neodymium grade, pull force, Gauss rating, coating or plating, magnetisation direction, pole orientation, 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, magnetic circuit, target steel composition and thickness, available contact area, air gaps, surface condition, load direction and installation geometry.

The stated 25mm x 25mm x 12.5mm dimensions describe the physical size 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.