Neodymium Disc Magnet 39mm x 18mm N45H | High Temperature ≤120ºC
Same Day Dispatch
Order before 1pm to qualify for same day dispatch.
Neodymium Disc Magnet – 39mm x 18mm | N45H High Temperature
The Neodymium Disc Magnet – 39mm x 18mm | N45H High Temperature is a large, exceptionally powerful rare earth permanent magnet engineered for demanding applications that require strong magnetic performance and improved resistance to elevated operating temperatures.
Manufactured from premium N45H grade neodymium iron boron (NdFeB), this high-temperature magnet provides greater thermal stability than standard N-grade neodymium magnets. It is well suited to industrial machinery, automation systems, motors, manufacturing equipment, magnetic clamping systems, separation equipment, and specialised engineering assemblies where heat exposure may affect conventional magnets.
Measuring 39mm in diameter and 18mm thick, this substantial disc magnet has a broad contact surface and a robust profile capable of generating significant magnetic attraction. Its compact circular shape allows it to be incorporated into custom housings, fixtures, equipment, tools, and OEM products where powerful and reliable magnetic performance is required.
This magnet is axially magnetised through its 18mm thickness, meaning the north and south poles are positioned on the two large flat circular faces. It is protected by a durable nickel-copper-nickel coating, which provides a clean metallic finish and helps protect the underlying neodymium material from corrosion and everyday wear.
Key Features
- Premium N45H high-temperature neodymium magnet
- Strong rare earth magnetic performance
- Measures 39mm in diameter x 18mm thick
- Improved temperature resistance compared with standard N-grade magnets
- Large magnetic contact surface
- Axially magnetised through the thickness
- North and south poles located on the flat circular faces
- Durable nickel-copper-nickel plated finish
- Permanent magnet requiring no external power
- Suitable for demanding industrial and engineering applications
Common Applications
- Industrial automation systems
- Electric motors and generators
- Magnetic clamping equipment
- Engineering fixtures and jigs
- Manufacturing machinery
- Robotics and actuator assemblies
- Magnetic separation systems
- Scientific and laboratory equipment
- Custom magnetic tools
- OEM product development
Ideal For
- Industrial engineers
- Equipment manufacturers
- Automation specialists
- Motor and generator manufacturers
- Robotics developers
- Research laboratories
- Maintenance departments
- Product designers
- Machinery builders
- Custom fabrication projects
Why Choose an N45H High-Temperature Neodymium Magnet?
Standard neodymium magnets can experience a reduction in magnetic performance when exposed to excessive heat. The N45H grade is specifically formulated to provide enhanced temperature stability while retaining the powerful magnetic characteristics associated with rare earth magnets.
This makes the magnet particularly useful in machinery, motors, automation equipment, production environments, and other systems where operating temperatures may exceed the limits of standard neodymium grades. Its large 39mm x 18mm profile also provides substantial magnetic volume, creating a powerful and concentrated magnetic field.
The nickel-copper-nickel coating helps protect the magnet during handling and use in dry indoor environments. When correctly installed and operated within its specified temperature and environmental limits, this magnet can provide dependable, long-term magnetic performance.
Technical Specifications
- Product Type: High-Temperature Neodymium Disc Magnet
- Material: Neodymium Iron Boron (NdFeB)
- Grade: N45H
- Shape: Disc
- Diameter: 39mm
- Thickness: 18mm
- Magnetisation: Axially magnetised through the 18mm thickness
- Pole Orientation: North and south poles on the flat circular faces
- Coating: Nickel-Copper-Nickel
- Temperature Classification: High-temperature neodymium grade
- Application: Holding, clamping, separation, automation, machinery, motors, and engineered magnetic assemblies
Please Note
This is a large and extremely powerful neodymium magnet. It may attract nearby steel objects or other magnets without warning, creating serious pinch, crush, impact, and breakage hazards. Appropriate handling procedures and personal protective equipment should be used.
The maximum suitable operating temperature can vary according to the magnet’s geometry, magnetic circuit, coating, environment, and application. Confirm the required temperature rating before incorporating this magnet into heat-sensitive or safety-critical equipment.
Actual pull force will vary according to the thickness, grade, size, finish, and condition of the mating steel surface. Air gaps, coatings, uneven contact, elevated temperatures, and sideways or peeling forces can significantly reduce holding performance.
Neodymium magnets are hard but brittle. Do not drill, cut, machine, weld, or allow the magnet to collide with another magnet or steel surface. Damaging the protective coating may expose the magnet to corrosion.
Keep away from children, pacemakers, medical implants, magnetic storage media, electronic equipment, and other devices that may be affected by strong magnetic fields.
Typical Physical Properties
NB: Ranges are indicative for product category, please check individual products for specic values within that range.
Production Flow Diagram
Demagnetization Curves
Surface Treatment
The most common coating for Neodymium magnets is Nickel + Copper + Nickel (Ni + Cu + Ni). This coating offers the magnet relatively good protection from corrosion and passive applications. If the magnet will be exposed to moisture or liquid then consider the use of an organic coating such as Epoxy. A hard wearing coating, Epoxy is suited to applications where the magnet will come under some friction or knocking.
Range and Tolerance
Magnets are readily available in Blocks, Discs, Cylinders & Rings. We specializes in the supply of short-run prototype magnets including Arc Segments, various magnetic orientations etc. If you need a magnet size that we don't carry in stock, submit a Design-a-Magnet enquiry for a quote on your custom magnet design.
Magnetic Properties
Neodymium magnets are offered in several different grades. The first section N30-54 has an operating temperature of up to 80 degrees. Most of our stock only goes up to N38. The second section, denoted with the "M" prefix after the grade has an operating temperature 100 degrees. After this the grades are "H", "SH", "UH" & "EH". In order for the magnet to withstand a higher operating temperature, during production more of the raw material PrNd is incorporated as these elements have a naturally occurring resistance to high temperatures.
Returns Policy
If you are not entirely satisfied with your purchase, we're here to help.
We have a 30 Day Returns policy at Frenergy Magnets. You may return your item within 30 days of receiving it to receive a refund.
The product/s must be unused and in the same condition you received them in. Please contact us at info@frenergy.com.au to initiate the returns process.
The buyer is responsible for the cost of returning the order.
