Neodymium Cylinder Magnet 5mm x 8mm N42UH | High Temperature ≤180ºC
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Neodymium Cylinder Magnet – 5mm x 8mm | N42UH High Temperature
The Neodymium Cylinder Magnet – 5mm x 8mm | N42UH High Temperature is a compact, high-performance rare earth magnet designed for precision applications that require dependable magnetic strength in elevated-temperature environments. Manufactured from premium N42UH grade neodymium iron boron (NdFeB), this permanent magnet combines powerful magnetic performance with greater thermal stability than standard neodymium grades.
Measuring 5mm in diameter and 8mm long, this small cylinder magnet offers a useful elongated profile for installation inside drilled holes, housings, shafts, sensors, couplings, actuators, and other space-restricted assemblies. Its cylindrical geometry produces a balanced, symmetrical magnetic field that is particularly useful for locating, switching, sensing, alignment, and precision positioning applications.
The magnet is axially magnetised through its 8mm length, placing the north and south poles on the two circular end faces. This configuration concentrates the magnetic field at each end of the cylinder and supports reliable face-to-face attraction, magnetic coupling, component detection, and end-on holding against suitable ferrous surfaces.
A protective nickel-copper-nickel coating provides a smooth silver-coloured finish and helps protect the neodymium material from corrosion and normal handling wear. This high-temperature cylinder magnet is well suited to engineering, automation, automotive, electronics, scientific, and OEM applications where a compact magnetic component must continue performing reliably under heat.
Key Features
- Premium N42UH high-temperature neodymium magnet
- Compact 5mm diameter x 8mm length
- Strong rare earth magnetic performance
- Greater temperature resistance than standard N-grade magnets
- Elongated cylindrical profile for compact assemblies
- Axially magnetised through the 8mm length
- North and south poles located on the circular end faces
- Symmetrical magnetic field around the cylinder
- Durable nickel-copper-nickel plated finish
- Precision manufactured for consistent dimensions and performance
Common Applications
- High-temperature sensor assemblies
- Reed switch activation
- Robotics and automation systems
- Small electric motors
- Magnetic couplings
- Precision actuators
- Automotive components
- Electronic equipment
- Scientific instruments
- OEM product assemblies
Ideal For
- Engineers
- Product designers
- Automation specialists
- Electronics manufacturers
- Robotics developers
- Automotive engineers
- Research laboratories
- Medical equipment manufacturers
- Maintenance technicians
- Prototype and product development teams
Why Choose an N42UH High-Temperature Cylinder Magnet?
The N42UH grade is engineered to provide a strong balance between magnetic output and high-temperature resistance. Standard neodymium magnets can suffer permanent magnetic loss when exposed to excessive heat, while UH-grade magnets are designed for more thermally demanding operating conditions.
Its 5mm x 8mm cylindrical shape is particularly useful in mechanical and electronic assemblies. The longer profile can assist with insertion into housings, alignment inside tubular components, and the creation of a focused end-to-end magnetic field for sensors, switches, couplings, and locating systems.
Cylinder magnets are commonly used around shafts and within precision components because their circular geometry simplifies alignment. The symmetrical shape also makes this magnet practical for rotational assemblies, position detection, and compact designs where a rectangular magnet would be difficult to install.
Technical Specifications
- Product Type: High-Temperature Neodymium Cylinder Magnet
- Material: Neodymium Iron Boron (NdFeB)
- Magnet Grade: N42UH
- Shape: Cylinder
- Diameter: 5mm
- Length: 8mm
- Magnetisation: Axially magnetised through the 8mm length
- Pole Orientation: North and south poles on the circular end faces
- Coating: Nickel-Copper-Nickel
- Finish: Silver-coloured metallic finish
- Temperature Classification: Ultra-high-temperature neodymium grade
- Application: Sensing, positioning, coupling, locating, automation, motors, electronics, and precision engineering
Please Note
Although N42UH neodymium magnets provide greater temperature resistance than standard neodymium grades, they must still remain within their specified operating limits. Maximum suitable temperature can vary according to the magnet's dimensions, magnetic circuit, environment, coating, and application design.
Actual pull force will vary depending on the thickness, grade, finish, and condition of the mating steel. Air gaps, paint, coatings, uneven contact, misalignment, elevated temperatures, and sideways or peeling forces can significantly reduce magnetic holding performance.
Neodymium magnets are hard but brittle. Do not drill, cut, machine, weld, or allow the magnet to strike another magnet or steel surface, as it may chip, crack, or shatter.
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.
