Neodymium Block Magnet – 12.5mm x 6mm x 3.5mm

The Neodymium Block Magnet – 12.5mm x 6mm x 3.5mm is a compact rectangular rare earth permanent magnet measuring 12.5mm long x 6mm wide x 3.5mm thick. Manufactured from Neodymium Iron Boron (NdFeB), this small block magnet provides high magnetic performance relative to its size and is suitable for precision engineering, product assemblies, magnetic closures, sensors, electronics, fixtures, models, prototyping and OEM applications.

Also known as a rare earth block magnet, NdFeB rectangular magnet, neodymium bar magnet or rectangular neodymium magnet, its compact dimensions make it particularly useful where a strong permanent magnetic component needs to be incorporated into a relatively small rectangular housing, slot or recess.

As a permanent magnet, this 12.5mm x 6mm x 3.5mm neodymium block requires no electricity, batteries or charging to maintain its magnetic field.

Key Features

• 12.5mm length x 6mm width x 3.5mm thickness
• Neodymium Iron Boron (NdFeB)
• High-performance rare earth permanent magnet
• Compact rectangular / block geometry
• High magnetic performance relative to size
• Suitable for space-restricted applications
• Useful for magnetic holding and positioning
• Suitable for small magnetic closures
• Can be integrated into compatible housings and recesses
• Useful for sensors, models and prototypes
• Permanent magnetic operation
• No electricity or batteries required
• Suitable for custom and OEM magnetic assemblies

Common Applications

• Precision engineering
• Product assemblies
• Magnetic closures
• Sensors and switches
• Electronics
• Fixtures and jigs
• Furniture and cabinetry
• Displays and signage
• Models and miniatures
• Craft and hobby projects
• Magnetic positioning
• Research and development
• Prototyping
• Custom magnetic systems
• OEM products

Compact 12.5mm x 6mm x 3.5mm Neodymium Block Magnet

This neodymium magnet measures 12.5mm long x 6mm wide x 3.5mm thick, creating a compact rectangular magnetic component suitable for integration into small assemblies.

Its block geometry can be particularly useful for:

• Rectangular recesses
• Product housings
• Magnetic closures
• Fixtures
• Sensor assemblies
• Display components
• Furniture
• Prototype mechanisms
• Custom manufactured products

The 12.5mm x 6mm x 3.5mm 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 makes neodymium particularly useful where a magnetic function needs to be incorporated into a compact product or mechanism.

Small neodymium block magnets are commonly used in:

• Engineering assemblies
• Electronics
• Sensors
• Magnetic closures
• Product manufacturing
• Furniture
• Fixtures
• Prototypes
• OEM components

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

Rectangular Magnet for Product Assemblies

The rectangular shape can simplify integration into products containing straight-sided slots, recesses or housings.

Potential applications include:

• Magnetic catches
• Removable covers
• Boxes and cases
• Display components
• Furniture fittings
• Product enclosures
• Locating mechanisms
• Sensor systems
• Prototype assemblies

For engineered products, magnetic performance should be assessed as part of the complete magnetic and mechanical assembly.

Magnetisation Direction

The magnetisation direction of this 12.5mm x 6mm x 3.5mm block magnet has not been supplied.

Block magnets can be magnetised through different dimensional axes, meaning the north and south poles may be positioned on different pairs of opposing faces.

Magnetisation direction can significantly affect performance in:

• Holding applications
• Magnet-to-magnet connections
• Sensors
• Magnetic switches
• Couplings
• Positioning systems
• Custom magnetic circuits

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
• 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 dimensions.

Direct Pull vs Shear Force

Magnetic holding performance varies according to the direction in which a load is applied.

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.

Magnetic Attraction and Air Gaps

Neodymium magnets generally perform best when positioned close to clean, flat and sufficiently thick ferromagnetic steel.

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

Air gaps can be introduced by:

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

This is particularly important for compact magnets because even a relatively thin non-magnetic layer can represent a significant gap compared with the magnet's dimensions.

Bonding Neodymium Block Magnets

This compact block magnet can be suitable for bonding into compatible rectangular housings, slots or recesses.

Before bonding:

• Clean the magnet and substrate
• Remove grease, dust and contamination
• Select an adhesive compatible with both surfaces
• Follow the adhesive manufacturer's preparation instructions
• Avoid excessive adhesive that unnecessarily increases the magnetic air gap
• 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 because Neodymium Iron Boron is mechanically brittle.

Compatible Target Materials

Neodymium magnets attract ferromagnetic iron and compatible steels.

Suitable targets may include:

• Mild steel
• Iron
• Magnetic steel
• Ferromagnetic fasteners
• Compatible machinery 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 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
• Suitability for precision and miniature assemblies
• Strong performance where installation space is restricted

Ferrite magnets are generally:

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

A neodymium block magnet can therefore be particularly useful where compact dimensions and high magnetic performance relative to size are important.

Permanent Magnetic Operation

This NdFeB block is a permanent magnet, requiring no external power source 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 Block Magnet
• Alternative Names: Rare Earth Block Magnet, NdFeB Rectangular Magnet, Neodymium Bar Magnet, Rectangular Neodymium Magnet
• Length: 12.5mm
• Width: 6mm
• Thickness: 3.5mm
• Shape: Block / Rectangular
• 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, sensing and integration into compact magnetic assemblies
• Typical Applications: Engineering, closures, sensors, electronics, furniture, fixtures, prototypes and OEM products

Precision, Manufacturing and OEM Applications

The compact 12.5mm x 6mm x 3.5mm dimensions make this neodymium block magnet suitable for incorporation into small manufactured products and precision assemblies.

Potential users include:

• Engineers
• Product designers
• Electronics manufacturers
• Sensor manufacturers
• Furniture manufacturers
• Fixture and jig manufacturers
• Model makers
• Research laboratories
• Prototype developers
• OEM manufacturers

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

Handling Small Neodymium Block Magnets

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

Neodymium Iron Boron is also hard and brittle, meaning magnets may chip, crack or fracture if allowed to collide forcefully.

Avoid:

• Allowing magnets to snap together uncontrollably
• Forceful impact with steel surfaces
• Crushing
• Excessive mechanical stress
• Drilling
• Cutting
• Conventional machining

Use controlled handling when separating or bringing neodymium magnets together.

Please Note

This product is a Neodymium Block Magnet measuring 12.5mm long x 6mm wide x 3.5mm 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 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.