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Ultra-strong N52 sintered NdFeB ring magnets for compact assemblies and precision devices
Axially magnetized (through thickness): N/S poles on flat faces for predictable holding/flux paths
Custom ID/OD/thickness, coating, tolerance, and packing for EU/US industrial supply chains
N52 tiny ring neodymium magnets are compact, high-energy sintered NdFeB magnets designed for precision assemblies where space is limited but magnetic performance must remain strong and consistent. Ring (donut) geometry is ideal for alignment, shaft/fastener integration, and compact sensor or fixture designs.
Values are typical ranges for N52 grade. Actual performance depends on size, working gap, coating, and assembly design.
| Property | Typical Value | Unit |
|---|---|---|
| Remanence (Br) | 14.2 – 14.8 | kGs |
| Coercivity (Hcb) | ≥ 10.8 | kOe |
| Intrinsic Coercivity (Hcj) | ≥ 12.0 | kOe |
| Max Energy Product (BHmax) | 50 – 52 | MGOe |
| Max Working Temperature | 80°C (Standard N grade) | °C |
| Parameter | Option | Notes |
|---|---|---|
| Outer Diameter (OD) | Custom | Common micro sizes supported |
| Inner Diameter (ID) | Custom | Hole concentricity controllable |
| Thickness (T) | Custom | Axial magnetization (through thickness) |
| Dimensional Tolerance | ±0.05 mm to ±0.10 mm | Depends on size and processing route |
| Magnetization | Axial (standard) | Other directions available by design |
Tip for engineering buyers: For tiny rings, holding force is highly sensitive to air gap and mating material. Share your assembly drawing if you need performance validation.
| Plating Type | Overall Thickness | Salt Spray Test | Pressure Cooker Test | Typical Use |
|---|---|---|---|---|
| Ni-Cu-Ni | 15–21 μm | 24 hrs | 48 hrs | General industrial applications |
| Ni-Cu-Ni + Epoxy | 20–28 μm | 48 hrs | 72 hrs | Humidity / mild outdoor environments |
| Zn (Zinc) | 7–15 μm | 12 hrs | 24 hrs | Cost-sensitive applications |
| Black Nickel / Gold / Custom | Custom | By requirement | By requirement | Special appearance or application |
Axial magnetization means the ring is magnetized through its thickness, with North and South poles on the two flat faces. This is the most common configuration for ring magnets used in fixtures and sensor assemblies.
N52 offers maximum strength at room temperature, but if your operating temperature is higher than 80°C, consider high-temperature grades (H/SH/UH/EH/AH) based on your design requirements.
Yes. We support custom sizes, concentricity control, tolerance requirements, coating selection, and packaging for production supply. Provide a drawing or target dimensions and tolerance for evaluation.
Ni-Cu-Ni is common for general indoor industrial use. Epoxy is preferred for humid environments. Zinc is a cost-focused option with lower corrosion resistance. Tell us your environment to recommend the best coating.
Please share OD, ID, thickness, grade (N52 or high-temp grade), coating, magnetization direction, quantity, application environment (temperature/humidity), and any drawing or performance target.
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