Super Strong NdFeB Neodymium Magnet Ring 40x20x10

The NdFeB neodymium magnet ring in 40 × 20 × 10 mm dimensions is a super strong rare-earth magnetic component engineered for industrial use. Instead of having poles on the flat faces like typical axially magnetized rings, this version has its north and south poles located on opposite curved surfaces, which delivers a tailored field profile suitable for rotational and sensing applications.

Made from high-performance N42 NdFeB material, this ring magnet offers reliable flux density and resistance to demagnetization. Its geometry and pole orientation support controlled magnetic interaction in assemblies where motion or angular detection is needed.

• Material: Sintered Nd-Fe-B (Neodymium Iron Boron)
• Grade: N42, selected for field strength and stability
• Size: Outer Diameter 40 mm × Inner Diameter 20 mm × Thickness 10 mm
• Magnetization Direction: Curved/diametrical magnetization with opposite poles on curved sides (not standard axial)
• Weight: Approx. 75 g
• Coating: Ni–Cu–Ni triple layer for corrosion resistance and surface durability
• Resistance to Demagnetization: Optimized through controlled manufacturing and grade selection
• Certifications: ISO9001, TS16949, RoHS, SGS (quality traceability and compliance)

This configuration is useful where field direction and symmetry matter, such as in rotors or position feedback mechanisms.

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Unlike simple radial or axial rings, the unique pole placement in this magnet ring enables:

• More predictable magnetic interaction in rotating assemblies
• Controlled torque generation in compact mechanisms
• Field patterns suitable for incremental sensors or Hall effect arrangements

The triple-layer nickel, copper and nickel plating protects the NdFeB core from oxidation and mechanical wear during handling and assembly, which is essential for components intended for repeated motion or close mechanical fits.

While its size is compact, this ring magnet serves several practical engineering needs:

• Rotary motion modules where ring magnets couple with stators or encoder elements
• Sensors & encoders that require consistent, repeatable flux around a shaft or bore
• Magnetic couplings in compact electromechanical assemblies
• Automation mechanisms where torque and field orientation must be predictable

Its geometry simplifies integration into housings that require a central shaft or alignment pin, reducing assembly effort and enabling more consistent performance across production lots.

We support bulk orders and OEM integrations with options that include:

• Custom magnetization patterns or pole arrangements
• Alternate grades for higher temperature tolerance or greater flux density
• Tailored coating options for challenging environments
• Packaging and labeling per project needs

Providing intended operating conditions (temperature, humidity, duty cycle) and any mechanical constraints helps ensure accurate specification from the start, reducing design revisions and expediting delivery.

• Magnets should be press-fit or bonded with appropriate fixtures to avoid chipping during assembly.
• Keep tools and fingers clear during handling - strong NdFeB rings can snap together with force.
• Verify surface conditions and tolerances to ensure proper magnetic gap and field performance.

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