Neodymium Segment Magnet R7.5xr2.5x22.5°x2mm N50 GOLD (16pc/set)
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Neodymium Segment Magnet – R7.5 × r2.5 × 22.5° × 2mm | N50 Gold Coated | 16 Piece Set
The Neodymium Segment Magnet – R7.5 × r2.5 × 22.5° × 2mm | N50 Gold Coated (16 Piece Set) is a precision-engineered rare earth permanent magnet designed for high-performance rotary magnetic assemblies, electric motors, generators, magnetic couplings, and scientific applications. Manufactured from premium N50-grade Neodymium Iron Boron (NdFeB), these arc-shaped segment magnets deliver exceptional magnetic strength while maintaining precise dimensional accuracy for demanding engineering projects.
Each magnet features an outer radius of 7.5mm, inner radius of 2.5mm, 22.5° arc, and 2mm thickness. Supplied as a complete set of 16 matching segments, the magnets form a full 360° magnetic ring when assembled, making them ideal for brushless DC motors (BLDC), servo motors, alternators, magnetic rotors, research equipment, and custom magnetic systems.
These magnets are finished with an attractive and durable gold coating, which provides enhanced corrosion resistance while offering a distinctive premium appearance. Gold-coated neodymium magnets are commonly selected for specialised engineering applications, laboratory equipment, decorative products, and environments where additional protection against oxidation is beneficial.
The magnets are axially magnetised, meaning the north and south poles are located on the two flat faces, producing a powerful and consistent magnetic field across the assembled ring.
Key Features
- Premium N50-grade neodymium rare earth magnets
- Precision segment (arc) magnet design
- Dimensions: R7.5 × r2.5 × 22.5° × 2mm
- Supplied as a 16-piece matched set to form a complete circular ring
- Premium gold-plated finish for improved corrosion resistance and appearance
- Axially magnetised for strong face-to-face magnetic performance
- Extremely high magnetic energy product
- Precision manufactured for consistent magnetic characteristics
- Suitable for industrial, commercial, laboratory, and OEM applications
Common Applications
- Brushless DC (BLDC) motors
- Permanent magnet synchronous motors (PMSM)
- Electric motors and generators
- Magnetic rotor assemblies
- Magnetic couplings
- Scientific research equipment
- Laboratory instruments
- Robotics and automation systems
- Custom engineering projects
- Prototype motor development
Ideal For
- Electrical engineers
- Mechanical engineers
- Motor manufacturers
- Robotics designers
- OEM manufacturers
- Research laboratories
- Universities
- Product development teams
- Scientific equipment manufacturers
- Advanced hobbyists and innovators
Why Choose N50 Gold-Coated Segment Magnets?
The Neodymium Segment Magnet R7.5 × r2.5 × 22.5° × 2mm N50 Gold Coated Set is specifically designed for applications requiring maximum magnetic performance in a compact curved geometry. The high-performance N50 material provides one of the strongest commercially available magnetic grades, enabling engineers to design smaller, lighter, and more efficient magnetic assemblies.
The 22.5° arc geometry allows the 16 magnets to create a complete magnetic ring with excellent dimensional accuracy, making them ideal for precision motor rotors, generators, magnetic bearings, and custom rotating magnetic systems. The premium gold coating provides additional protection against corrosion while delivering a distinctive finish suitable for specialised industrial and scientific applications.
Technical Specifications
- Material: Neodymium Iron Boron (NdFeB)
- Magnet Grade: N50
- Shape: Segment (Arc)
- Outer Radius (R): 7.5mm
- Inner Radius (r): 2.5mm
- Arc Angle: 22.5°
- Thickness: 2mm
- Quantity: 16 magnets per set
- Magnetisation: Axial (through the thickness)
- Coating: Gold
- Magnet Type: Permanent Rare Earth Magnet
Please Note
These are extremely powerful rare earth magnets and should be handled carefully. Individual segments can attract each other with significant force, and improper handling may result in pinch injuries or cause the magnets to chip or crack if allowed to collide.
This product is supplied as a 16-piece set, with each segment designed to form part of a complete circular magnetic assembly. Care should be taken to maintain the correct orientation during installation to achieve the intended magnetic circuit.
Maximum holding force is measured under ideal laboratory conditions using a clean, flat, thick mild steel surface with full magnetic contact. Actual magnetic performance will vary depending on air gaps, steel thickness, operating temperature, magnetic circuit design, and mounting arrangement.
Keep away from children, as small magnets present a serious swallowing hazard. Keep away from pacemakers, implanted medical devices, sensitive electronic equipment, and magnetic storage media. Do not drill, machine, or strike the magnets, as neodymium is hard but brittle and may fracture under mechanical stress. For optimum performance and longevity, avoid exposure to excessive heat, corrosive chemicals, or strong mechanical impacts.
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.
