Product Descriptions
When ordinary magnets won't do, the super strong round disc N52 neodymium magnet delivers the highest commercially available magnetic energy density in a simple, versatile disc shape. With a maximum energy product of 50‑52 MGOe and remanence of 1.43‑1.48 T, N52 generates significantly more holding force than N42 or N35 in the same diameter and thickness – often eliminating the need for larger, heavier magnets or multiple stacked units. This extreme performance makes these discs the first choice for engineers designing compact magnetic latches, miniaturized sensors, high‑power holding fixtures, and efficient brushless motor rotors. Our vertically integrated factory produces every disc from 100% virgin rare‑earth materials (purity ≥95%, no recycled powder) with full process control: vacuum melting, jet milling, sintering, precision grinding, automated Ni‑Cu‑Ni electroplating, and axial magnetization. Standard tolerances: diameter ±0.03 mm, thickness ±0.02 mm, with parallel faces within 0.02 mm. Custom diameters from 3 mm to 80 mm, epoxy or gold coatings, and high‑temperature N52H (up to 120°C) are available. Each batch ships with a material test certificate and full traceability, backed by IATF 16949
and ISO 9001 certification.
Why N52 Disc Magnets Outperform Lower Grades
Maximum Energy Density
At 50‑52 MGOe, a super strong round disc N52 neodymium magnet can replace an N42 disc that is 20‑30% larger in diameter or thickness – saving valuable space in compact electronic and mechanical assemblies.
Precision Ground Geometry
Our double‑disc grinding ensures parallel faces and consistent thickness across production runs. Tight tolerances (±0.02 mm on thickness) are critical for stacking multiple discs or fitting into shallow pockets.
Robust Corrosion Protection
Standard Ni‑Cu‑Ni triple plating (13‑18 μm total) passes 72+ hours salt spray testing per ASTM B117. Epoxy coating available for electrical insulation or additional chemical resistance.
Technical Specifications – N52 Round Disc Magnets
Below are magnetic properties and common stock dimensions for super strong round disc N52 neodymium magnets. Custom diameters, thicknesses, and high‑temperature N52H grade are available.
| Parameter | Value / Options |
|---|---|
| Grade & Energy Product | N52 – 398‑414 kJ/m³ (50‑52 MGOe) |
| Remanence (Br) | 1.43 – 1.48 T (14.3 – 14.8 kG) |
| Coercivity (Hcb) | ≥ 860 kA/m (≥ 10.8 kOe) |
| Intrinsic Coercivity (Hcj) | ≥ 876 kA/m (≥ 11.0 kOe); N52H ≥ 1350 kA/m |
| Max Operating Temp | 70°C standard; N52H up to 120°C |
| Standard Disc Sizes (D×T mm) | 6×2, 8×3, 10×2, 10×5, 12×3, 15×5, 20×3, 20×10, 25×5, 30×10, 40×10, 50×15 |
| Standard Coating | Ni‑Cu‑Ni triple layer – salt spray ≥72h |
*Custom diameters from 3 mm to 80 mm, thicknesses from 0.5 mm to 25 mm available. N52H grade adds dysprosium for higher temperature stability.
Magnet Plating
Complex & Custom Directions
While we categorize common directions (Axial, Diametral, Radial), the true number is limitless. The direction is a fundamental design choice, determined by the intended function of the magnet within the final assembly.
Application Fields
N52 round magnets are widely used wherever compact, ultra-strong permanent magnets are required. Their outstanding performance allows designers to reduce the size and weight of mechanical components across many industries.
Typical uses include:
High-strength holding fixtures • Precision sensors • Reed switches • Hard disk assemblies • Audio transducers • Headphones • Loudspeakers • MRI systems • Magnetic-drive pumps • Motors & generators • Tool holders • Magnetic bearings • Door latches • Dental and medical instruments • Magnetic separation systems • Lifting equipment • Arts & crafts • Model building • Wall displays • POP signage • Packaging closures • Jewelry mechanisms • Laboratory devices • Educational kits • and more.
Quality Assurance – Fully Integrated Manufacturing
Achieving consistent N52 performance requires uncompromised raw materials and process control. Our facility begins with vacuum induction melting of certified virgin neodymium, iron, and boron (purity ≥99.5% for rare earth elements, no recycled scrap). The alloy is jet‑milled to uniform 3‑5 μm powder, pressed in a magnetic field, and sintered under tightly controlled thermal profiles. After heat treatment, discs are ground on both faces using double‑disc grinding, then centerless ground for diameter precision. Ni‑Cu‑Ni plating is applied in automated barrel lines with real‑time XRF thickness monitoring. Every batch of super strong round disc N52 neodymium magnets is 100% tested for magnetic flux (Helmholtz coil or Gauss meter), dimensional accuracy (vision system), and coating adhesion (cross‑cut test). Salt‑spray samples are run per ASTM B117. We supply full test certificates with material traceability codes. Our IATF 16949 and ISO 9001 systems ensure repeatability for high‑volume orders.
Packaging & Global Logistics
Each disc magnet is individually wrapped in VCI paper and placed in foam‑lined 8‑cell inner boxes to prevent scratching and edge chipping. Outer cartons are reinforced for sea or air freight. Lead times: standard sizes 5‑7 days, custom discs 10‑12 days after drawing approval. Free samples available for qualified projects. Express shipping via DHL/FedEx or economical LCL/FCL container.
FAQ
Q: Why choose N52 grade instead of lower grades like N35 or N42?
A: N52 offers the highest magnetic energy product available in mass production, providing significantly stronger pull force. It's ideal for applications where maximum strength is required in small dimensions.
Q: What coating is best for N52 round magnets?
A: Nickel (Ni-Cu-Ni) is the most durable and commonly used coating. For high-humidity environments, epoxy coating provides better corrosion resistance.
Q: Can N52 magnets be used in high-temperature applications?
A: Standard N52 magnets operate up to 80°C. If you require higher temperature tolerance, we can provide heat-resistant grades such as N42SH or N35EH.
Q: Do N52 neodymium round magnets break easily?
A: Neodymium magnets are strong but brittle. They should be handled carefully to avoid impact or snapping together. We can provide separators or fixtures for safer assembly.
Q: Do you provide free samples for evaluation?
A: Yes. We support custom magnetization (axial, diametrical, multi-pole), tight tolerances, and special coatings required for motor or sensor applications.
Need Extreme Holding Power in a Small Package?
Tell us your required diameter, thickness, operating temperature, and quantity. Our engineers will confirm N52 suitability, provide a CAD drawing, and offer free samples for validation. Direct factory pricing with full certificatio