Neodymium Ring Magnet OD8mm x H3mm | Hole 6.1mm | N50H | High Temperature ≤120ºC | Epoxy Coated
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Neodymium Ring Magnet – OD8mm x H3mm | ID6.1mm | N50H | High Temperature 120°C | Epoxy Coated
Designed for demanding environments where both high magnetic strength and elevated temperature resistance are required, this Neodymium Ring Magnet features an 8mm outside diameter (OD), 6.1mm inside diameter (ID), and 3mm height (H). Manufactured from premium N50H-grade NdFeB (Neodymium Iron Boron) rare earth magnetic material, this compact ring magnet combines exceptional magnetic performance with a maximum operating temperature of up to 120°C, making it ideal for industrial, automotive, electronic, and engineering applications.
The large 6.1mm centre hole allows the magnet to be mounted over screws, bolts, shafts, or tubes, making it suitable for precision assemblies, sensors, actuators, magnetic couplings, and compact mounting systems where space is limited.
Unlike standard neodymium magnets, the N50H high-temperature grade is specifically designed to retain its magnetic performance in elevated operating temperatures of up to 120°C, making it an excellent choice for environments where conventional neodymium magnets may lose strength.
The magnet is finished with a durable black epoxy coating, providing enhanced protection against corrosion, moisture, chemicals, and abrasion. This coating offers greater environmental resistance than traditional nickel-plated magnets, making it well suited to harsh industrial conditions and outdoor applications.
This ring magnet is axially magnetised, meaning the magnetic poles are located on the two flat circular faces, providing maximum holding force when used against a ferrous steel surface or paired with another magnet.
Features & Benefits
- Premium N50H-grade rare earth neodymium ring magnet
- Dimensions: 8mm (OD) x 6.1mm (ID) x 3mm (H)
- High-temperature grade with operating temperatures up to 120°C
- Durable black epoxy coating for superior corrosion resistance
- Axially magnetised for maximum face-to-face magnetic performance
- Large centre hole for mounting over bolts, shafts, or tubes
- Exceptional magnetic strength for its compact size
- Precision-manufactured for consistent quality
- Long-lasting permanent magnet
Common Applications
- High-temperature electronic assemblies
- Automotive sensors and components
- Electric motors and actuators
- Precision engineering
- Magnetic couplings
- Industrial automation
- Scientific instruments
- Compact magnetic mounting systems
Ideal For
- Mechanical engineers
- Electronics manufacturers
- Automotive engineers
- Industrial designers
- OEM equipment manufacturers
- Research laboratories
- Automation specialists
- Prototype development
Why Choose an N50H Epoxy Coated Neodymium Ring Magnet?
The N50H grade delivers outstanding magnetic strength while maintaining performance at operating temperatures of up to 120°C, making it ideal for demanding environments where standard neodymium magnets may begin to lose magnetic force. The black epoxy coating provides superior protection against corrosion, humidity, chemicals, and abrasion, making it particularly suitable for outdoor, marine, automotive, and industrial applications.
Its compact dimensions and large centre hole make this magnet an excellent solution for precision mechanical assemblies, rotating components, magnetic fixtures, and space-constrained designs requiring reliable long-term performance.
Please Note
This is a high-strength rare earth magnet and should be handled carefully to avoid pinch injuries or damage caused by magnets snapping together. Although rated for continuous operation up to 120°C, exceeding this temperature may permanently reduce magnetic performance.
Holding strength is achieved under ideal conditions using a clean, flat, thick ferrous steel surface with direct face-to-face contact. Actual magnetic performance will vary depending on the application, air gap, surface finish, and mounting arrangement.
Keep away from children, pacemakers, implanted medical devices, sensitive electronic equipment, and magnetic storage media. Avoid drilling, machining, or subjecting the magnet to heavy impacts, as this may damage the epoxy coating or cause the magnet to chip or crack.
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.
