Neodymium Block Magnet – 25mm x 25mm x 5mm

The Neodymium Block Magnet – 25mm x 25mm x 5mm is a square, low-profile rare earth permanent magnet measuring 25mm long x 25mm wide x 5mm thick. Manufactured from Neodymium Iron Boron (NdFeB), this compact block magnet provides high magnetic performance relative to its size and is suitable for engineering, manufacturing, magnetic holding, positioning, fixtures, jigs, furniture, displays, product assemblies, prototyping and custom OEM applications.

Also known as a rare earth block magnet, square neodymium magnet, NdFeB block magnet or flat neodymium magnet, its broad 25mm x 25mm square footprint and slim 5mm profile make it useful where a relatively large magnetic face is required within a shallow installation space.

As a permanent magnet, this 25mm x 25mm x 5mm neodymium block requires no electricity, batteries or charging to maintain its magnetic field.

Key Features

• 25mm length x 25mm width x 5mm thickness
• Square, low-profile geometry
• Neodymium Iron Boron (NdFeB)
• High-performance rare earth permanent magnet
• Broad 25mm x 25mm square footprint
• Slim 5mm profile
• High magnetic performance relative to size
• Suitable for magnetic holding and positioning
• Useful for fixtures and jigs
• Suitable for product assemblies and magnetic closures
• Can be integrated into shallow recesses and housings
• Permanent magnetic operation
• No electricity or batteries required
• Suitable for engineering and OEM applications

Common Applications

• Industrial equipment
• Engineering assemblies
• Manufacturing
• Magnetic holding and positioning
• Fixtures and jigs
• Product assemblies
• Magnetic closures
• Furniture and cabinetry
• Displays and signage
• Machinery
• Removable panels
• Research and development
• Prototyping
• Custom magnetic systems
• OEM products

25mm x 25mm x 5mm Square Neodymium Magnet

This neodymium block magnet measures:

• Length: 25mm
• Width: 25mm
• Thickness: 5mm

The equal length and width create a square 25mm x 25mm footprint, while the 5mm thickness provides a comparatively slim profile.

This geometry can be useful for integration into:

• Shallow recesses
• Flat product housings
• Fixtures
• Jigs
• Display systems
• Furniture
• Cabinetry
• Removable panels
• Prototype assemblies

The dimensions describe the physical size of the magnet and should not be interpreted as a pull-force, holding-capacity or safe working load 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 for engineered products where substantial permanent magnetic attraction is required from a compact component.

NdFeB block magnets are commonly incorporated into:

• Industrial equipment
• Manufacturing systems
• Fixtures and jigs
• Magnetic closures
• Furniture
• Displays
• Sensors
• Product assemblies
• Custom OEM products

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

Low-Profile Magnetic Applications

At only 5mm thick, this block magnet is well suited to applications where available installation depth is limited.

Potential uses include:

• Recessed magnetic closures
• Slim fixtures
• Display panels
• Cabinetry
• Furniture
• Signage
• Equipment panels
• Product housings
• Custom manufactured components

The broad square footprint can also provide useful geometry for magnetic systems requiring a flat rectangular component.

Magnetic Holding and Positioning

This neodymium block magnet can be incorporated into appropriately designed magnetic holding and positioning systems.

Potential uses include:

• Holding components against steel
• Positioning parts during assembly
• Locating components
• Removable connections
• Magnetic catches
• Fixtures
• Jigs
• Prototype mechanisms

Actual holding performance depends on the complete magnetic and mechanical assembly.

Magnetic Closures and Removable Panels

Square neodymium block magnets can be integrated into magnetic closure systems for compatible applications.

Potential uses include:

• Cabinets
• Furniture
• Boxes
• Cases
• Access panels
• Removable covers
• Display systems
• Product enclosures

Where magnets are used in opposing pairs, pole orientation should be checked before permanent installation to ensure the magnets attract rather than repel.

Where failure of the magnetic connection could allow a panel or component to fall, suitable secondary mechanical retention should be incorporated.

Magnetisation Direction

The magnetisation direction of this 25mm x 25mm x 5mm block magnet has not been supplied.

Block magnets may be magnetised through different dimensional axes. The north and south poles may therefore be positioned on different pairs of opposing faces depending on the magnet's design.

Magnetisation direction affects:

• Pole location
• Working face selection
• Holding performance
• Magnet-to-magnet connections
• Sensor response
• Magnetic circuit design

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

Magnetic Holding Performance

Actual magnetic performance depends on factors including:

• NdFeB magnetic grade
• Magnetisation direction
• Target steel thickness
• Target steel composition
• Available contact area
• Surface flatness
• Air gaps
• 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 25mm x 25mm x 5mm 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 surface and encourages the magnet to slide.

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

Vibration, shock and mechanical leverage can further affect holding reliability.

Magnetic Attraction and Air Gaps

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

Magnetic performance can be reduced by gaps created by:

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

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

Bonding Neodymium Block Magnets

The flat geometry of this block magnet can make it suitable for bonding into compatible housings and recesses.

For reliable installation:

• Clean the magnet and substrate
• Remove grease, dust and contamination
• Select an adhesive compatible with both materials
• Follow the adhesive manufacturer's surface preparation instructions
• Avoid unnecessarily thick adhesive layers
• Allow the adhesive to cure fully before loading
• Keep curing temperatures within the magnet's permitted operating conditions
• Avoid force-fitting the magnet into an undersized recess

Neodymium Iron Boron is mechanically brittle and should not be subjected to excessive pressure during installation.

Compatible Target Materials

Neodymium magnets attract ferromagnetic iron and compatible steels.

Suitable target materials may include:

• Mild steel
• Iron
• Magnetic steel
• Ferromagnetic fasteners
• Compatible machinery components
• Steel plates

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 Block Magnets

Neodymium and ferrite are both permanent magnetic materials but provide different characteristics.

Neodymium magnets generally offer:

• Much higher magnetic strength relative to size
• Compact dimensions
• Strong performance in space-restricted applications
• Suitability for engineered magnetic assemblies

Ferrite magnets are generally:

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

Neodymium is often selected where high magnetic performance within compact dimensions is an important design consideration.

Permanent Magnetic Operation

This NdFeB block is a permanent magnet and requires no external electrical supply.

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 Block Magnet
• Alternative Names: Square Neodymium Magnet, Rare Earth Block Magnet, NdFeB Block Magnet, Flat Neodymium Magnet
• Length: 25mm
• Width: 25mm
• Thickness: 5mm
• Shape: Square / Block
• Profile: Low Profile
• 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, closure and integration into magnetic assemblies
• Typical Applications: Engineering, manufacturing, fixtures, jigs, furniture, displays, product assemblies, prototypes and OEM products

Engineering, Manufacturing and OEM Applications

The combination of a 25mm x 25mm square footprint and 5mm thickness makes this neodymium block magnet suitable for integration into a variety of engineered and manufactured products.

Potential users include:

• Engineers
• Product designers
• Equipment manufacturers
• Furniture manufacturers
• Display manufacturers
• Fixture and jig manufacturers
• Research laboratories
• Prototype developers
• OEM manufacturers

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

Handling Neodymium Block Magnets

Neodymium magnets can generate strong attraction relative to their size and should be handled carefully.

Neodymium Iron Boron is also a hard and brittle material. Magnets can chip, crack or fracture if allowed to collide forcefully.

Avoid:

• Allowing magnets to snap together uncontrollably
• Forceful impact with steel
• Placing fingers between attracting magnets or steel
• Flexing or bending the magnet
• Crushing or excessive mechanical pressure
• Drilling
• Cutting
• Conventional machining

The relatively slim 5mm profile means particular care should be taken to avoid bending or levering forces during installation and removal.

Please Note

This product is a Neodymium Block Magnet measuring 25mm long x 25mm wide x 5mm 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 hard and brittle. Avoid drilling, cutting, machining, bending, force-fitting, impact and uncontrolled collisions.

This magnet should not be treated as certified lifting equipment or used as the sole means of supporting a hazardous load without an appropriately engineered and rated system.

Keep neodymium magnets securely away from babies and children. Swallowed magnets can cause severe internal injuries requiring urgent medical attention.

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