Neodymium Ring Magnet OD19mm x H4mm | Hole 8mm N38
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Neodymium Ring Magnet OD19mm x H4mm | Hole 8mm N38
Compact, lightweight, and exceptionally powerful, this Neodymium Ring Magnet features a 19mm outside diameter (OD), 8mm inside diameter (ID), and 4mm height (H). Manufactured from premium N38-grade NdFeB (Neodymium Iron Boron) rare earth magnetic material, this permanent magnet delivers impressive magnetic strength in a low-profile ring design, making it ideal for engineering, electronics, product development, automation, and precision DIY projects.
Neodymium magnets are the strongest commercially available permanent magnets, providing significantly greater holding force than ferrite, Alnico, or samarium cobalt magnets of similar size. The 8mm centre hole allows the magnet to be mounted over bolts, shafts, threaded rods, or tubing, making it ideal for magnetic fixtures, sensors, mounting systems, rotating components, and custom mechanical assemblies.
This ring magnet is axially magnetised, meaning the magnetic poles are located on the two flat circular faces. This orientation maximises face-to-face holding performance when used against a ferrous steel surface or paired with another magnet.
The magnet is finished with a durable nickel-copper-nickel (Ni-Cu-Ni) coating, providing excellent resistance to corrosion and everyday wear while maintaining a smooth, polished appearance.
Features & Benefits
- Premium N38-grade rare earth neodymium ring magnet
- Dimensions: 19mm (OD) x 8mm (ID) x 4mm (H)
- Axially magnetised for maximum face-to-face magnetic performance
- Precision 8mm centre hole for mounting over bolts, shafts, or threaded rods
- Low-profile design with exceptional holding power
- Durable nickel-copper-nickel (Ni-Cu-Ni) coating
- Precision-manufactured for consistent quality
- Long-lasting permanent magnet
- Suitable for industrial, commercial, and DIY applications
Common Applications
- Magnetic mounting systems
- Engineering and manufacturing
- Electric motors and generators
- Sensors and instrumentation
- Automation equipment
- Workshop jigs and fixtures
- Scientific equipment
- DIY fabrication and prototyping
Ideal For
- Engineers
- Manufacturers
- Product designers
- Industrial maintenance
- Electronics technicians
- Prototype development
- Research laboratories
- Hobbyists and makers
Why Choose an N38 Neodymium Ring Magnet?
N38-grade neodymium ring magnets offer an excellent balance of magnetic strength, durability, and value. Their low-profile design makes them ideal for compact assemblies where installation space is limited, while the centre hole allows easy mounting onto shafts, bolts, or threaded fasteners. They are widely used in automation, magnetic couplings, mounting systems, sensors, and custom-engineered products.
Please Note
Neodymium magnets are extremely powerful for their size and should be handled carefully to avoid pinch injuries or damage caused by magnets snapping together. Holding performance is achieved under ideal conditions using a clean, flat, thick steel surface with direct contact. Actual magnetic strength will vary depending on the application, air gap, mounting arrangement, and the material being attracted. Keep away from children, pacemakers, sensitive electronic devices, and magnetic storage media. Avoid drilling, machining, excessive heat, or heavy impacts, as these may permanently damage the magnet or reduce its magnetic performance.
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.
