Neodymium Disc Magnet – 70mm x 40mm | N48 Heavy-Duty Rare Earth Magnet

Description

The Frenergy Magnets Neodymium Disc Magnet – 70mm x 40mm | N48 is an exceptionally large, high-strength Rare Earth permanent magnet designed for demanding industrial, engineering, manufacturing and specialised magnetic applications.

Manufactured from N48-grade Neodymium Iron Boron (NdFeB), this powerful cylindrical magnet measures 70mm in diameter and 40mm in height, providing a substantial volume of high-energy magnetic material.

With its large circular profile and considerable thickness, this Neodymium magnet is suitable for applications requiring a substantial permanent magnetic field, including industrial magnetic assemblies, magnetic testing, research, equipment manufacturing and custom engineering projects.

The 70mm diameter provides a large circular contact surface, while the 40mm height creates a substantial cylindrical body capable of supporting demanding magnetic circuit designs.

The N48 magnetic grade identifies a high-energy Neodymium material classification, offering greater maximum magnetic energy density than lower grades such as N35, N38 and N42.

Neodymium magnets are among the strongest commercially available permanent magnetic materials, and large-format N48 magnets can generate extremely powerful magnetic attraction.

Due to its substantial dimensions and high magnetic grade, this magnet requires specialised handling procedures, appropriate protective equipment and careful installation planning.

The magnet should not be handled casually or allowed to approach large steel objects or other powerful magnets without adequate separation and control.

The large cylindrical geometry makes this product suitable for custom magnetic assemblies, industrial equipment, magnetic research and specialised engineering applications where permanent magnetic performance is required.

It may also be incorporated into appropriately engineered magnetic circuits, fixtures and machinery components.

Actual magnetic holding strength depends on the magnetisation direction, receiving steel thickness, contact area, air gaps, surface coatings and installation conditions.

Although N48 is a high-energy magnetic grade, the grade alone does not determine the finished magnet's pull-force rating.

The specific pull force, surface Gauss, magnetisation direction, protective coating and maximum operating temperature have not been supplied.

These characteristics should be verified before use in applications requiring precise magnetic field orientation or defined holding performance.

Neodymium magnets are brittle by nature and may chip, crack or shatter if subjected to impact or sudden collision.

For a magnet of this size, uncontrolled attraction can create serious crushing, pinch and projectile hazards.

Professional handling and appropriate engineering controls are strongly recommended.

Also known as a 70mm Neodymium disc magnet, 70x40mm Rare Earth magnet, N48 cylindrical magnet, large Neodymium round magnet, heavy-duty permanent magnet or industrial Neodymium magnet, this product is intended for applications where substantial magnetic material volume and high magnetic energy density are required.

Whether you're developing an industrial magnetic assembly, conducting magnetic research, designing specialised machinery or manufacturing custom magnetic equipment, the Frenergy Magnets Neodymium Disc Magnet – 70mm x 40mm | N48 provides high-energy permanent magnetic material in a substantial cylindrical format.

Key Features

• N48 Neodymium Grade: High-energy Rare Earth magnetic material.

• 70mm Diameter: Large circular magnetic profile.

• 40mm Height: Substantial cylindrical construction.

• Neodymium Iron Boron (NdFeB): High-strength permanent magnetic material.

• High Magnetic Energy Density: Strong magnetic properties relative to size.

• Large Material Volume: Suitable for demanding magnetic circuit designs.

• Permanent Magnetism: No electrical power required.

• Industrial Applications: Suitable for specialised engineering and manufacturing projects.

• Magnetic Research: Relevant to controlled laboratory and development environments.

• Custom Magnetic Assemblies: Suitable for engineered magnetic systems.

• Substantial Cylindrical Geometry: Useful for large-format magnetic components.

• Precision Engineering Potential: Relevant to appropriately designed equipment.

• Specialised Handling Required: Powerful magnetic attraction creates significant hazards.

• Professional Installation Recommended: Suitable engineering controls are essential.

Common Applications

Industrial Magnetic Assemblies

Incorporate into appropriately engineered magnetic systems requiring substantial permanent magnetic material.

Magnetic Research and Development

Use in controlled research environments for magnetic field investigations and prototype development.

Equipment Manufacturing

Integrate into specialised industrial machinery and custom equipment.

Magnetic Circuit Design

Develop magnetic circuits requiring large cylindrical Neodymium components.

Engineering Prototyping

Test magnetic assembly configurations and high-energy permanent magnet designs.

Industrial Fixtures

Use in appropriately designed magnetic fixtures and holding systems after verifying load requirements.

Magnetic Testing Equipment

Incorporate into suitable test systems requiring a permanent magnetic field.

Specialised Automation

Use in engineered automation assemblies where high magnetic energy density is required.

Custom Manufacturing

Integrate into specialised products and industrial components.

Laboratory Applications

Use in professionally controlled magnetic experiments and technical investigations.

Why Choose a 70mm x 40mm N48 Neodymium Magnet?

High Magnetic Energy Density

N48 Neodymium offers strong magnetic material properties suitable for demanding applications.

Large 70mm Diameter

Provides a substantial circular magnetic surface.

40mm Cylindrical Height

Creates a large magnetic material volume for engineered assemblies.

Permanent Magnetic Field

No electrical power required.

Industrial Engineering Potential

Suitable for specialised equipment and custom magnetic systems.

Versatile Magnetic Circuit Applications

Useful where substantial permanent magnetic material is required.

Technical Specifications

Estimated weight is calculated using a representative NdFeB density of 7.5g/cm³ and is not a measured product specification.

Understanding the Magnet Dimensions

Diameter – 70mm

The magnet has a nominal diameter of 70mm.

This represents the width across the circular magnetic body.

Height – 40mm

The magnet measures 40mm high.

This substantial height provides a large cylindrical magnetic body.

Diameter-to-Height Ratio

The nominal diameter-to-height ratio is:

70mm ÷ 40mm = 1.75:1

Circular Face Area

The nominal circular face area is:

π × (35mm)² = approximately 3,848.45mm²

Equivalent to approximately 38.48cm².

Material Volume

The nominal material volume is:

π × (35mm)² × 40mm = approximately 153,938mm³

Equivalent to approximately 153.94cm³.

Estimated Weight

Using a representative Neodymium magnet density of 7.5g/cm³, the estimated weight is approximately:

1,155 grams (1.15kg)

Actual weight may vary due to manufacturing tolerances, material composition and coating.

What Is an N48 Neodymium Magnet?

An N48 Neodymium magnet is a permanent Rare Earth magnet manufactured from Neodymium Iron Boron material with an N48 magnetic grade classification.

The N48 grade generally corresponds to a maximum energy product of approximately 46–49 MGOe, depending on the applicable material specification.

This classification describes the magnetic material's energy capability rather than the finished magnet's direct pull force.

N48 magnets are commonly used in applications requiring high magnetic energy density and substantial magnetic performance.

What Is a Large Neodymium Disc Magnet?

A large Neodymium disc magnet is a cylindrical permanent magnet manufactured from Neodymium Iron Boron material.

Large-format disc magnets are used in specialised engineering applications where substantial magnetic material volume is required.

They may be incorporated into magnetic circuits, industrial equipment, research systems and custom assemblies.

Their performance depends on the magnetic grade, magnetisation direction, geometry and surrounding magnetic circuit.

How Does an N48 Disc Magnet Work?

The Neodymium material generates a permanent magnetic field.

Depending on the magnetisation direction, the north and south poles may be positioned on opposite flat faces or across the diameter.

For an axially magnetised cylindrical magnet, the poles are located on opposite circular faces.

For a diametrically magnetised cylindrical magnet, the poles are positioned across the diameter.

The magnetisation direction of this particular product has not been specified and must be confirmed before use in directional magnetic assemblies.

Understanding Magnetisation Direction

Axial Magnetisation

Magnetised through the 40mm height, with poles on opposite circular faces.

Diametric Magnetisation

Magnetised across the 70mm diameter, with poles positioned on opposite sides of the cylindrical body.

Why Magnetisation Matters

Magnetisation direction determines the magnetic field distribution and influences suitability for magnetic circuits, fixtures, research systems and industrial assemblies.

Do not assume a particular magnetisation direction without confirmation.

Benefits of N48 Neodymium Disc Magnets

High Magnetic Energy Density

Strong magnetic material properties suitable for demanding applications.

Large Cylindrical Construction

Substantial magnetic material volume for engineered systems.

Permanent Magnetic Field

No electrical power required.

Industrial Versatility

Useful for specialised technical applications.

Magnetic Circuit Compatibility

Suitable for custom magnetic circuit designs.

Engineering Development

Relevant to research, prototyping and equipment manufacturing.

N48 vs Other Neodymium Grades

Higher grades generally provide greater maximum magnetic energy density, but the finished magnet's pull force also depends on geometry, magnetisation and installation conditions.

Large Disc Magnets vs Smaller Disc Magnets

Large Neodymium magnets can generate substantial attraction and require significantly greater handling precautions than small magnetic components.

How to Handle and Install the N48 Disc Magnet

Important: This large, high-energy magnet should only be handled by appropriately trained personnel using a documented safe handling procedure.

1. Review the Application: Confirm that the magnet's dimensions and grade are appropriate.

2. Verify Magnetisation: Identify the magnetic pole orientation before installation.

3. Assess the Hazards: Evaluate crushing, pinch, projectile and equipment risks.

4. Prepare the Work Area: Remove unnecessary ferromagnetic objects and magnetic materials.

5. Use Appropriate Equipment: Select non-magnetic handling aids and suitable mechanical controls.

6. Maintain Separation: Keep other magnets and steel components at controlled distances.

7. Inspect the Magnet: Check for chips, cracks or coating damage without placing fingers near potential pinch points.

8. Prepare the Assembly: Ensure the receiving structure is suitable for the expected magnetic forces.

9. Control Movement: Use engineered restraints to prevent sudden magnetic attraction.

10. Install Carefully: Follow an approved installation procedure.

11. Verify Retention: Confirm mechanical security and magnetic performance.

12. Inspect Regularly: Check the assembly for damage, movement or deterioration.

Factors Affecting Magnetic Holding Strength

Magnetic Grade

N48 identifies the magnetic material's energy classification.

Magnetisation Direction

Pole orientation influences magnetic field distribution and attraction.

Receiving Steel

Steel composition, thickness and geometry affect holding performance.

Air Gaps

Even small gaps can significantly reduce magnetic attraction.

Contact Area

The effective magnetic contact area influences holding performance.

Surface Coatings

Paint, plating and other layers can create additional separation.

Load Direction

Direct pull and sideways sliding loads behave differently.

Temperature

Excessive heat can reduce Neodymium magnetic performance.

Mechanical Damage

Cracks, chips or coating damage may affect performance.

Care and Maintenance

• Handle only using appropriate safety procedures.

• Prevent uncontrolled contact with steel or other magnets.

• Avoid dropping or striking the magnet.

• Do not drill or machine the magnet.

• Avoid excessive mechanical pressure.

• Keep away from excessive heat.

• Protect from moisture where coating suitability is unknown.

• Store in a secure location with suitable separation from ferromagnetic objects.

• Keep away from magnetically sensitive equipment.

• Inspect for damage before installation.

• Use appropriate mechanical restraints.

• Keep away from children and unauthorised personnel.

Compliance & Safety

Extreme Magnetic Attraction: This large N48 Neodymium magnet may generate very powerful attraction to ferromagnetic materials.

Crushing and Pinch Hazard: Uncontrolled movement can cause serious injuries.

Projectile Hazard: Ferromagnetic objects may accelerate towards the magnet unexpectedly.

Brittle Material: Neodymium magnets may chip, crack or shatter under impact.

Eye Protection: Suitable eye protection should be used where impact or fragmentation risks exist.

Medical Devices: Keep magnets away from pacemakers and magnetically sensitive implanted medical devices. Appropriate exclusion distances must be determined.

Electronic Equipment: Strong magnetic fields may interfere with sensitive electronic devices and equipment.

Mechanical Stress: Avoid impact, excessive pressure and uncontrolled magnetic attraction.

Temperature Limitations: The maximum operating temperature has not been specified.

Corrosion Protection: The protective coating has not been confirmed.

Handling Equipment: Use appropriate non-magnetic handling aids and engineered restraints.

Safety-Critical Applications: Independent engineering assessment and testing are required before use where failure could cause injury or damage.

Frequently Asked Questions

What are the dimensions of this Neodymium disc magnet?

It measures 70mm in diameter and 40mm in height.

What is the magnetic grade?

The magnet is N48 grade.

What material is it made from?

It is manufactured from Neodymium Iron Boron (NdFeB).

Is this a Rare Earth magnet?

Yes. Neodymium is a Rare Earth magnetic material.

What is the diameter?

The diameter is 70mm.

What is the height?

The height is 40mm.

What is the estimated weight?

Approximately 1.15kg, calculated using representative NdFeB density.

Is the magnet axially magnetised?

The magnetisation direction has not been specified.

Is it diametrically magnetised?

The magnetisation direction has not been specified.

What is the pull force?

A pull-force rating has not been provided.

What is the surface Gauss?

The surface Gauss rating has not been supplied.

What coating does it have?

The protective coating has not been specified.

Is N48 a strong magnetic grade?

Yes. N48 is a high-energy Neodymium grade suitable for demanding permanent magnet applications.

Is N48 stronger than N35?

N48 generally has a higher maximum energy product than N35, although actual holding performance depends on magnet design.

Is N52 stronger than N48?

N52 generally has a higher maximum energy product, but the finished magnet's performance depends on geometry and application conditions.

Is this magnet suitable for industrial applications?

Yes, in appropriately engineered applications with suitable handling and safety controls.

Can I use it for magnetic research?

Yes, in controlled research environments with appropriate safety procedures.

Can I use it for custom magnetic assemblies?

Yes. It may be suitable for engineered magnetic circuits and specialised assemblies.

Is this magnet safe to handle by hand?

Due to its size and magnetic energy, specialised handling equipment and procedures are strongly recommended.

Will it attract steel?

Yes. It attracts suitable ferromagnetic steel.

Will it attract aluminium?

No. Aluminium is not ferromagnetic.

Will it attract stainless steel?

Only if the stainless steel grade is sufficiently magnetic.

Can I glue the magnet into a recess?

Adhesive mounting should only be considered after engineering assessment of the magnetic forces and mechanical requirements.

Can I drill the magnet?

No. Neodymium magnets are brittle and should not be drilled or machined.

Is the magnet waterproof?

Waterproof performance has not been confirmed.

Can I use it outdoors?

Outdoor suitability has not been confirmed.

What is the maximum operating temperature?

The maximum operating temperature has not been specified.

Is the magnet suitable for children?

No. This large, powerful magnet is not suitable for children.

Can I use it for lifting?

Do not use it for lifting without verified holding capacity, engineered lifting equipment and appropriate safety certification.

Can I use it for safety-critical applications?

Only after appropriate engineering verification, testing and compliance assessment.

Related Products

• Neodymium Disc Magnets

• N48 Rare Earth Magnets

• Large Neodymium Magnets

• Heavy-Duty Neodymium Magnets

• Neodymium Block Magnets

• Neodymium Ring Magnets

• Neodymium Cylinder Magnets

• Industrial Magnetic Assemblies

• Magnetic Research Components

• High-Strength Permanent Magnets

Please Note

The Frenergy Magnets Neodymium Disc Magnet – 70mm x 40mm | N48 is a large-format Rare Earth permanent magnet designed for industrial engineering, magnetic research and specialised magnetic assemblies.

The magnet measures 70mm in diameter and 40mm in height.

It is manufactured from N48-grade Neodymium Iron Boron.

The estimated magnet weight is approximately 1.15kg, based on representative NdFeB density. This is not a verified product weight.

The specific magnetisation direction, pull force, surface Gauss, protective coating, maximum operating temperature and manufacturing tolerance have not been supplied.

Actual magnetic performance depends on magnetisation, receiving steel, air gaps, contact area and installation conditions.

Important: This is a large, high-energy Neodymium magnet capable of creating serious crushing, pinch and projectile hazards. It must be handled using appropriate engineering controls, protective equipment and documented safety procedures. Neodymium magnets are brittle and may shatter under impact. Independent engineering assessment and testing are essential before use in demanding or safety-critical applications.