Neodymium Cylinder Magnet – 5mm x 5mm | N50M | High Temperature

The Neodymium Cylinder Magnet – 5mm x 5mm | N50M | High Temperature is a compact, high-performance rare earth permanent magnet measuring 5mm in diameter x 5mm long. Manufactured from N50M grade Neodymium Iron Boron (NdFeB), this cylindrical magnet combines high magnetic energy density with an elevated-temperature grade designed to provide improved resistance to irreversible demagnetisation at higher operating temperatures compared with equivalent standard-temperature neodymium grades.

With an equal 5mm diameter and 5mm length, this magnet has a balanced cylindrical profile suitable for compact engineering, electronic and mechanical assemblies. Its small dimensions make it useful where installation space is limited, while the N50M material grade makes it particularly relevant to applications where both high magnetic performance and elevated-temperature capability are important design considerations.

Potential applications include industrial equipment, electronics, sensors, instrumentation, machinery, positioning systems, magnetic switching, compact mechanical assemblies, research, prototypes and OEM products.

Also known as a 5mm neodymium cylinder magnet, N50M rare earth magnet, high-temperature neodymium magnet, 5mm NdFeB cylinder, miniature high-temperature magnet or N50M cylinder magnet, this permanent magnet operates continuously without electricity, batteries or charging.

Key Features

• Diameter: 5mm
• Length: 5mm
• Dimensions: 5mm diameter x 5mm long
• Shape: Cylinder
• Material: Neodymium Iron Boron (NdFeB)
• Magnetic grade: N50M
• Temperature classification: Elevated-temperature neodymium grade
• Magnet type: Rare earth permanent magnet
• Equal diameter and length
• Compact cylindrical geometry
• High magnetic performance relative to size
• Improved resistance to irreversible demagnetisation at elevated temperatures compared with equivalent standard-temperature grades
• Suitable for compact engineering assemblies
• Useful for electronics and sensor applications
• Suitable for industrial and OEM product integration
• Permanent magnetic operation
• No electricity, batteries or charging required

Common Applications

• High-temperature magnetic assemblies
• Industrial equipment
• Machinery
• Electronics
• Sensors
• Instrumentation
• Position detection
• Proximity sensing
• Magnetic switching
• Compact mechanical assemblies
• Positioning and alignment
• Fixtures and jigs
• Product development
• Laboratory equipment
• Research and development
• Prototypes
• OEM products
• Custom magnetic assemblies

N50M High-Temperature Neodymium Magnet

The N50M grade combines a high neodymium energy grade with an M temperature classification.

The N50 portion identifies the magnetic material grade, while the M suffix indicates a neodymium material formulated for improved resistance to irreversible magnetic losses at elevated temperatures compared with a corresponding standard-temperature grade.

This makes N50M useful where designers need to balance:

• Compact magnet dimensions
• High magnetic energy density
• Elevated operating temperatures
• Resistance to irreversible demagnetisation
• Space-constrained product design

A specific maximum operating temperature for this finished magnet has not been supplied and should therefore not be assumed solely from the N50M designation.

What Does N50M Mean?

N50M is a grade designation for Neodymium Iron Boron permanent magnet material.

The N50 designation relates to the material's maximum energy product and indicates its magnetic performance classification.

The M suffix identifies an elevated-temperature neodymium grade with enhanced resistance to irreversible demagnetisation compared with standard grades.

N50M does not mean:

• 50kg pull force
• A 50kg safe working load
• 50 Gauss
• A guaranteed holding capacity
• A specific finished-magnet operating temperature

Pull force, surface field and temperature performance depend on the complete magnet and application.

High-Temperature Applications

Temperature is an important consideration when selecting neodymium magnets.

As temperature increases, the magnetic output of NdFeB magnets generally decreases. Within appropriate operating conditions, much of this reduction can be reversible as the magnet cools.

Excessive temperature, however, can cause irreversible loss of magnetisation.

Elevated-temperature grades such as N50M are designed to provide improved resistance to this irreversible magnetic loss compared with corresponding standard-temperature neodymium grades.

Potential high-temperature applications may include:

• Industrial equipment
• Electronic assemblies
• Sensors
• Instrumentation
• Machinery
• Enclosed product assemblies
• Automotive or mechanical components
• Equipment operating near heat-generating components

The suitability of this magnet for any particular temperature should be confirmed against the actual application requirements.

Temperature Performance Depends on the Complete Application

A magnet's practical temperature capability is influenced by more than its grade designation.

Relevant factors can include:

• Magnet geometry
• Magnetic circuit
• Magnetisation direction
• Opposing magnetic fields
• Operating load line
• Duration of temperature exposure
• Peak temperature
• Repeated thermal cycling
• Surrounding materials
• Mechanical design

For applications operating close to a temperature limit, appropriate engineering margin and application-specific testing are recommended.

Any adhesive, housing, plastic component or other material used with the magnet must also be suitable for the intended temperature range.

Compact 5mm x 5mm Cylinder Design

This magnet measures 5mm in diameter x 5mm long, giving it a 1:1 diameter-to-length ratio.

Its compact cylindrical geometry can be useful where:

• Installation space is limited
• A small permanent magnet is required
• The magnet needs to fit inside a cylindrical recess
• Compact sensor systems are being developed
• Miniature magnetic components are required
• Product size and weight need to be minimised

The stated dimensions describe the physical geometry of the magnet and do not represent its pull force or holding capacity.

Electronics and Sensor Applications

Small neodymium cylinder magnets are frequently incorporated into magnetic sensing systems.

Potential applications include:

• Hall-effect sensors
• Reed switches
• Position sensors
• Proximity detection
• Magnetic switching
• Movement detection
• Instrumentation
• Control systems

Performance in a sensor application depends on factors such as:

• Magnetisation direction
• Pole orientation
• Magnet-to-sensor distance
• Sensor sensitivity
• Installation geometry
• Surrounding ferromagnetic materials
• Operating temperature

Testing the complete magnet-and-sensor assembly is recommended where reliable switching or sensing distances are critical.

Magnetisation Direction

Cylinder magnets can be manufactured with different magnetic orientations.

A 5mm diameter x 5mm long cylinder magnet could potentially be:

• Axially magnetised through its 5mm length
• Diametrically magnetised across its 5mm diameter
• Manufactured with another specialised magnetic configuration

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

Confirm the magnetisation configuration where field direction or pole position is important.

Magnetic Performance

Practical magnetic performance depends on factors including:

• N50M material properties
• Magnet dimensions
• Magnetisation direction
• Pole configuration
• Magnetic circuit
• Target material
• Target steel thickness
• Contact area
• Surface condition
• Air gaps
• Load direction
• Operating temperature
• Installation geometry

No specific pull force or magnetic flux density in Gauss has been supplied.

These values should not be inferred from the N50M grade alone.

Direct Pull vs Shear

Magnetic holding performance varies according to load direction.

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

Shear loading occurs when the magnet is encouraged to slide parallel to the target.

Shear performance can be affected by:

• Surface friction
• Surface coatings
• Air gaps
• Vibration
• Mechanical leverage
• Installation orientation

A pull-force figure measured under ideal laboratory conditions should not automatically be treated as a safe working load in a finished assembly.

Air Gaps Reduce Magnetic Attraction

Even a small separation between the magnet and its target can significantly reduce magnetic attraction.

Potential air gaps may be introduced by:

• Adhesive
• Paint
• Powder coating
• Plastic housings
• Protective films
• Surface irregularities
• Mechanical clearance

Because this magnet is only 5mm in diameter x 5mm long, small gaps can be particularly significant relative to its overall size.

Bonding N50M Neodymium Magnets

Adhesive bonding may be suitable for incorporating the magnet into a product or assembly.

Before bonding:

• Confirm polarity
• Confirm magnetisation orientation
• Clean the bonding surfaces
• Remove grease, dust and contamination
• Select an adhesive suitable for the magnet's actual surface finish
• Confirm the adhesive is suitable for the intended operating temperature
• Provide appropriate dimensional clearance
• Avoid force-fitting
• Allow the adhesive to cure correctly

The exact coating or plating has not been supplied, so adhesive compatibility with the magnet surface should be confirmed.

For high-temperature applications, the temperature capability of the adhesive may be as important as the temperature capability of the magnet itself.

Avoid Force-Fitting

Neodymium Iron Boron is hard but brittle.

Do not force the magnet into an undersized recess or housing.

Excessive pressure may cause:

• Chipping
• Cracking
• Fracturing
• Damage to the protective surface finish

Use suitable dimensional clearance and an appropriate retention method.

Do Not Machine Neodymium Magnets

Finished neodymium magnets should not normally be mechanically modified.

Avoid:

• Drilling
• Cutting
• Grinding
• Filing
• Crushing
• Machining

These processes can damage the brittle magnetic material and its protective surface.

Where a different magnet size is required, use a component manufactured to the required dimensions.

Compatible Target Materials

Neodymium magnets attract suitable ferromagnetic materials, including:

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

They do 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.

Test the intended target where magnetic compatibility is important.

N50M Neodymium vs Ferrite Magnets

N50M neodymium offers high magnetic energy density relative to conventional ferrite magnetic material.

N50M neodymium can be particularly useful for:

• Compact magnetic components
• Space-constrained designs
• Sensors
• Electronics
• Precision mechanisms
• High magnetic performance relative to size
• Applications requiring an elevated-temperature neodymium grade

Ferrite magnets may be preferred for:

• More economical applications
• Larger magnetic components
• Applications benefiting from good natural corrosion resistance
• Situations where lower magnetic performance relative to size is acceptable

The most appropriate material depends on the magnetic, dimensional, environmental and temperature requirements of the application.

Permanent Magnetic Operation

This N50M cylinder 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 Name: Neodymium Cylinder Magnet – 5mm x 5mm | N50M | High Temperature
• Product Type: High-Temperature Neodymium Cylinder Magnet
• Alternative Names: 5mm Neodymium Cylinder Magnet, N50M Magnet, High-Temperature Neodymium Magnet, 5mm NdFeB Cylinder, Miniature High-Temperature Magnet
• Diameter: 5mm
• Length: 5mm
• Dimensions: 5mm diameter x 5mm long
• Shape: Cylinder
• Magnetic Material: Neodymium Iron Boron (NdFeB)
• Magnetic Grade: N50M
• Temperature Classification: Elevated-temperature neodymium grade
• Magnet Type: Rare Earth Permanent Magnet
• Magnetic Operation: Permanent
• Power Required: None
• Compatible Targets: Suitable ferromagnetic iron and steel
• Typical Applications: High-temperature magnetic assemblies, electronics, sensors, instrumentation, engineering, machinery, positioning, switching, research, prototypes and OEM products

Safety and Handling

Despite its compact size, this 5mm x 5mm neodymium magnet can attract rapidly to other magnets or ferromagnetic objects.

Avoid uncontrolled collisions, which may cause the brittle NdFeB material to chip or fracture.

Because this magnet is small enough to present a serious ingestion hazard, it must be kept securely away from babies and children.

If multiple magnets are swallowed, they can attract to each other through body tissue and cause severe internal injuries. Suspected magnet ingestion requires urgent medical attention.

Permanent magnets should also be kept an appropriate distance from:

• Pacemakers and implanted medical devices
• Magnetic cards
• Magnetic storage media
• Magnetically sensitive instruments
• Sensitive electronic equipment

Please Note

The Neodymium Cylinder Magnet – 5mm x 5mm | N50M | High Temperature measures 5mm in diameter x 5mm long and is manufactured from N50M grade Neodymium Iron Boron.

The M suffix identifies an elevated-temperature neodymium grade with improved resistance to irreversible demagnetisation at higher temperatures compared with equivalent standard-temperature grades.

A specific maximum operating temperature for this finished magnet has not been supplied and should not be assumed from the N50M designation alone.

The N50M grade does not mean the magnet has a 50kg pull force.

No specific pull force, Gauss rating, coating or plating, magnetisation direction, pole configuration or dimensional tolerance has been supplied and these specifications should not be assumed.

Actual magnetic and temperature performance depends on factors including the magnet geometry, magnetic circuit, magnetisation configuration, operating temperature, duration of temperature exposure, external magnetic fields, target material, target steel thickness, air gaps and installation geometry.

Where the magnet is bonded into an assembly, ensure the adhesive and surrounding materials are also suitable for the intended operating temperature.

Neodymium is a hard and brittle magnetic material. Avoid impact, force-fitting, drilling, cutting, grinding or machining.

Because this magnet measures only 5mm x 5mm, it presents a serious swallowing hazard and must be kept securely away from babies and children.

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