Neodymium Block Magnet – 20mm x 20mm x 5mm

The Neodymium Block Magnet – 20mm x 20mm x 5mm is a compact, square rare earth permanent magnet measuring 20mm long x 20mm wide x 5mm thick. Manufactured from Neodymium Iron Boron (NdFeB), this low-profile block magnet provides high magnetic performance relative to its physical size and is suitable for industrial, engineering, manufacturing, commercial and custom product applications.

Its 20mm x 20mm square footprint and slim 5mm profile make this neodymium magnet useful for magnetic holding, positioning, closures, displays, furniture, fixtures, jigs, sensors, prototypes and OEM assemblies. The flat block shape is particularly convenient where a broad square magnetic component needs to fit within a shallow recess or compact housing.

Also known as a 20mm square neodymium magnet, rare earth block magnet, NdFeB block magnet, rectangular rare earth magnet, square magnet or 20mm x 20mm x 5mm magnet, this permanent magnetic component operates continuously without electricity, batteries or charging.

Key Features

• Length: 20mm
• Width: 20mm
• Thickness: 5mm
• Square, low-profile block design
• Neodymium Iron Boron (NdFeB)
• Rare earth permanent magnetic material
• High magnetic performance relative to size
• Broad 20mm x 20mm square footprint
• Slim 5mm profile
• Suitable for shallow recesses and housings
• Suitable for magnetic holding and positioning
• Useful for closures, displays and product assemblies
• Permanent magnetic operation
• No electricity or batteries required
• Suitable for industrial, commercial and OEM applications

Common Applications

• Magnetic closures
• Product assemblies
• Holding and positioning
• Fixtures and jigs
• Furniture and cabinetry
• Removable panels
• Displays and signage
• Sensors and switches
• Instrumentation
• Manufacturing equipment
• Engineering projects
• Models and prototypes
• Craft and DIY projects
• Packaging
• Research and development
• Custom magnetic assemblies
• OEM products

20mm x 20mm Square Neodymium Magnet

This neodymium magnet measures 20mm long x 20mm wide x 5mm thick, creating a square, low-profile block.

The broad 20mm x 20mm face can be useful for applications requiring a compact square magnetic footprint, while the 5mm thickness allows the magnet to fit into relatively shallow assemblies.

Potential installation locations include:

• Square or rectangular recesses
• Furniture components
• Plastic housings
• Timber assemblies
• Display structures
• Equipment enclosures
• Fixtures and jigs
• Custom fabricated parts

The magnet should not be force-fitted into an undersized recess, as neodymium magnetic material is hard and brittle.

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 strong magnetic performance is required within a relatively compact physical size.

Typical benefits include:

• High magnetic performance relative to size
• Compact permanent magnetic design
• Suitability for space-restricted assemblies
• Permanent magnetic operation
• No external power requirement
• Broad industrial and commercial applications

The specific neodymium grade has not been supplied, so grades such as N35, N42, N45, N50 or N52 should not be assumed.

Low-Profile Magnetic Applications

At only 5mm thick, this block magnet is suitable for applications where available installation depth may be limited.

Potential uses include:

• Shallow product housings
• Concealed magnetic closures
• Thin furniture components
• Removable panels
• Display systems
• Equipment assemblies
• Prototype designs
• Custom magnetic fixtures

Its square shape can also simplify alignment within rectangular components compared with circular magnets.

Magnetic Closures

Compact neodymium block magnets are commonly incorporated into magnetic closure systems.

Potential applications include:

• Cabinet doors
• Boxes
• Cases
• Packaging
• Furniture
• Display products
• Removable covers
• Access panels

Depending on the design, the magnet may attract another appropriately oriented magnet or a compatible ferromagnetic steel target.

For magnet-to-magnet closures, polarity and magnetisation direction must be considered before permanent installation.

Furniture and Cabinetry

The square, low-profile shape makes this magnet suitable for integration into furniture and cabinetry.

Potential uses include:

• Concealed magnetic catches
• Cabinet closures
• Removable panels
• Furniture accessories
• Display cabinets
• Decorative components
• Access covers

Where the magnet is recessed into timber or another material, allow suitable clearance rather than hammering or force-fitting the magnet into place.

Fixtures and Jigs

This 20mm x 20mm x 5mm block magnet can also be incorporated into manufacturing fixtures and jigs.

Potential applications include:

• Positioning guides
• Assembly fixtures
• Inspection fixtures
• Temporary stops
• Removable components
• Prototype tooling
• Custom workholding accessories

For dynamic, safety-critical or high-load applications, magnetic retention should be assessed under actual operating conditions and supplemented with mechanical retention where necessary.

Sensors, Switches and Instrumentation

Neodymium block magnets may be used as magnetic targets or actuators in suitable sensing systems.

Potential applications include:

• Reed switches
• Magnetic sensors
• Proximity detection
• Position detection
• Instrumentation
• Automation
• Electronic prototypes

The magnetisation direction has not been supplied for this magnet. For sensing applications, confirm the required magnetic pole orientation and field geometry before installation.

Magnetic Performance

The practical magnetic holding performance of a neodymium block magnet depends on factors including:

• Neodymium grade
• Magnetisation direction
• Target steel composition
• Target steel thickness
• Available contact area
• Surface flatness
• Air gaps
• Paint and coatings
• Rust and contamination
• Load direction
• Mechanical leverage
• Vibration and shock

No specific pull force or magnetic flux density in Gauss has been supplied for this magnet and these values should not be inferred from its dimensions alone.

Direct Pull vs Shear Force

Magnetic holding performance varies depending on the direction in which the load is applied.

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

Shear force occurs when the load acts parallel to the surface and encourages the magnet to slide.

A magnet used vertically can therefore provide substantially less practical holding performance than under ideal direct-pull conditions.

Surface friction, vibration, leverage and other dynamic forces can further reduce practical holding.

Air Gaps and Surface Contact

Neodymium magnets generally perform best when positioned close to suitable ferromagnetic steel.

Magnetic attraction can be reduced by gaps created by:

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

Even a relatively small air gap can significantly reduce magnetic performance.

For improved holding, maximise close contact between the magnet and compatible target material wherever practical.

Bonding Neodymium Block Magnets

Where mechanical mounting is not available, this block magnet may be bonded into a suitable recess or onto a compatible substrate.

Before bonding:

• Ensure both surfaces are clean and dry
• Remove grease, dust and contamination
• Select an adhesive compatible with both materials
• Provide sufficient clearance around the magnet
• Avoid force-fitting the magnet
• Allow the adhesive to cure according to its instructions

The specific coating or plating on this magnet has not been supplied, so adhesive compatibility should be confirmed before permanent installation.

Compatible Target Materials

Neodymium magnets attract suitable ferromagnetic materials, including:

• Mild steel
• Iron
• Magnetic steel
• Suitable ferromagnetic components

They will not effectively attract non-magnetic materials such as:

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

Many stainless steel grades are also weakly magnetic or non-magnetic and should be tested before relying on magnetic attachment.

Neodymium vs Ferrite Block Magnets

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

Neodymium magnets are generally selected where:

• High magnetic performance relative to size is required
• Available space is limited
• Compact magnetic assemblies are needed

Ferrite magnets are generally:

• More economical
• Naturally resistant to corrosion
• Less magnetically powerful relative to size
• Suitable for many general-purpose applications

Where a compact 20mm x 20mm x 5mm format is required, neodymium can provide high magnetic performance within a relatively small physical volume.

Permanent Magnetic Operation

This 20mm x 20mm x 5mm block magnet is a permanent magnet.

It requires:

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

The magnetic field remains continuously active during normal use.

Technical Specifications

• Product Type: Neodymium Block Magnet
• Alternative Names: Rare Earth Block Magnet, NdFeB Block Magnet, Square Neodymium Magnet, Rectangular Rare Earth Magnet
• Length: 20mm
• Width: 20mm
• Thickness: 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 holding, positioning, sensing and closure
• Typical Applications: Closures, product assemblies, furniture, displays, fixtures, jigs, sensors, prototypes and OEM products

Handling Neodymium Block Magnets

Neodymium magnetic material is hard and brittle.

Avoid:

• Allowing magnets to collide uncontrolled
• Dropping the magnet onto hard surfaces
• Drilling the magnet
• Cutting or machining the magnet
• Force-fitting into undersized recesses
• Applying bending or levering forces
• Allowing the magnet to snap violently onto steel

The relatively thin 5mm profile means particular care should be taken to avoid bending or levering the magnet during installation or removal.

Neodymium magnets can chip, crack or break when subjected to impact, and broken fragments may have sharp edges.

Safety Information

This neodymium magnet must be kept securely away from babies and children.

Swallowed magnets can cause severe or life-threatening internal injuries, particularly if multiple magnets are swallowed or a magnet is swallowed with another metal object. Seek urgent medical attention if magnet ingestion is known or suspected.

Strong magnets should also be kept an appropriate distance from:

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

Handle carefully to prevent uncontrolled attraction to other magnets or nearby ferromagnetic objects.

Please Note

This product is a Neodymium Block Magnet measuring 20mm long x 20mm wide x 5mm thick, manufactured from Neodymium Iron Boron (NdFeB) rare earth magnetic material.

No specific neodymium 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 the magnetic grade and magnetisation direction, target steel composition and thickness, available contact area, air gaps, surface condition, load direction and complete magnetic circuit.

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