Neodymium Ring Magnet OD12.5mm x H3mm | Hole 6mm N38
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Neodymium Ring Magnet – OD12.5mm x ID6mm x H3mm | N38
The Neodymium Ring Magnet – OD12.5mm x ID6mm x 3mm | N38 is a compact rare earth magnet designed for precision applications where a central mounting hole and dependable magnetic strength are required. Manufactured from high-quality N38 grade neodymium iron boron (NdFeB), this small ring magnet delivers strong permanent magnetic performance relative to its size.
Measuring 12.5mm in outer diameter, 6mm in inner diameter, and 3mm in height, this magnet has a slim, lightweight profile that can be incorporated into small mechanical assemblies, electronic devices, sensors, magnetic couplings, prototypes, and custom products. The central hole allows the magnet to be positioned around a shaft, pin, tube, rod, bolt, or other cylindrical component.
This neodymium ring magnet is axially magnetised through its 3mm thickness, meaning its north and south poles are located on the two flat annular faces. This pole orientation provides effective face-to-face attraction and makes the magnet suitable for holding, locating, switching, sensing, and coupling applications.
A durable nickel-copper-nickel coating provides a smooth metallic finish and helps protect the neodymium material from corrosion and everyday wear. Its precise circular geometry makes this N38 ring magnet a practical choice for engineering, manufacturing, electronics, research, and DIY projects requiring a small magnet with an open centre.
Key Features
- Premium N38 grade neodymium rare earth magnet
- 12.5mm outer diameter
- 6mm inner diameter
- 3mm height
- Compact ring-shaped design
- Central hole for positioning around shafts, pins, rods, or tubes
- Axially magnetised through the thickness
- North and south poles located on the flat annular faces
- Nickel-copper-nickel protective coating
- Strong permanent magnetic performance for its size
Common Applications
- Magnetic couplings
- Small sensor assemblies
- Electronic devices
- Robotics and automation
- Precision positioning systems
- Magnetic switches
- Shaft-mounted assemblies
- Product prototypes
- Model making
- Custom magnetic components
Ideal For
- Engineers
- Product designers
- Electronics technicians
- OEM manufacturers
- Robotics developers
- Research laboratories
- Educational projects
- Makers and hobbyists
- Maintenance technicians
- Custom fabrication projects
Why Choose This N38 Neodymium Ring Magnet?
The ring-shaped geometry provides practical mounting and positioning advantages over a solid disc magnet. Its 6mm centre hole allows it to fit around suitable shafts, pins, rods, tubes, and fasteners, making it easier to integrate into rotating components, sensors, couplings, and compact mechanical assemblies.
Its 12.5mm outer diameter and 3mm thickness create a slim magnetic component that can fit into applications with restricted installation space. The broad annular faces provide useful magnetic contact while the open centre can accommodate another component or reduce the overall weight of the assembly.
The N38 neodymium grade provides strong magnetic performance without requiring the additional cost of higher grades where they are not necessary. This makes the magnet a commercially practical choice for prototypes, production assemblies, repairs, educational equipment, and general engineering applications.
Technical Specifications
- Product Type: Neodymium Ring Magnet
- Material: Neodymium Iron Boron (NdFeB)
- Grade: N38
- Shape: Ring
- Outer Diameter: 12.5mm
- Inner Diameter: 6mm
- Hole Diameter: 6mm
- Height: 3mm
- Magnetisation: Axially magnetised through the 3mm thickness
- Pole Orientation: North and south poles on the flat annular faces
- Coating: Nickel-Copper-Nickel
- Finish: Silver-coloured metallic finish
- Application: Holding, positioning, sensing, coupling, mounting, and precision magnetic assemblies
Please Note
Neodymium magnets are extremely powerful for their size and should always be handled carefully. They may attract steel objects or other magnets suddenly, creating pinch hazards or causing the magnet to chip if an impact occurs.
The 6mm centre hole is not countersunk unless otherwise specified. Avoid overtightening fasteners or applying direct mechanical pressure to the magnet, as neodymium material is hard but brittle.
Actual pull force will vary according to the thickness, grade, finish, and condition of the mating steel surface. Air gaps, coatings, uneven contact, elevated temperatures, and sideways or peeling forces can reduce magnetic holding performance.
Do not drill, cut, machine, weld, or modify this magnet. Machining may fracture the magnet, damage its protective coating, and create hazardous dust.
Keep away from children, pacemakers, medical implants, magnetic storage media, electronic devices, and other equipment 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.
