Explore our industrial-grade, custom-engineered rare earth magnetic systems designed for reliability and extreme performance.
The 5x3mm Neodymium Magnet represents a pinnacle of structural micro-engineering. As a rare earth alloy composed primarily of Neodymium, Iron, and Boron (NdFeB), this micro-sized disc delivers an exceptionally high magnetic energy product relative to its tiny physical footprint. Measuring exactly 5mm in diameter and 3mm in thickness, it is widely utilized across industries requiring high-performance clamping, sensor triggering, acoustic conversion, and micro-actuation where spatial geometry is constrained.
At Zhejiang Laysun Magnetics Ltd., we optimize these dimensions using advanced sintering technologies, ensuring that each magnet offers uniform magnetic field distribution (flux density) and structural integrity. Through precise grain alignment and high-vacuum sintering, our 5x3mm NdFeB magnets achieve maximum energy density, ranging from the standard N35 grade up to the premium N52 grade, as well as high-coercivity grades like N45H, N42SH, and N38UH which are built to survive harsh operating conditions without permanent demagnetization.
Our precision machining allows for incredibly tight tolerances of up to ±0.02mm, which is a key requirement for automated high-volume assembly in consumer electronics, automotive sensors, and medical devices.
Zhejiang Laysun Magnetics Ltd. is a recognized national high-tech enterprise specializing in the research, development, fabrication, and global sales of advanced rare earth NdFeB permanent magnets. Established in 1999, we have accumulated over 25 years of specialized expertise in custom magnetic component manufacturing.
Our state-of-the-art production hub covers 100,000 square meters in Sichuan, China, enabling a highly integrated manufacturing process from raw material vacuum melting, powder milling, magnetic alignment, pressing, sintering, and machining, to specialized surface coatings. Supported by a workforce of 300 experienced professionals and robust QA infrastructure, we sustain an annual production output exceeding 5,000 tons of high-grade permanent magnets, servicing tier-1 automotive suppliers, global tech giants, and heavy industrial machinery developers.
Why sourcing your 5x3mm Neodymium Magnets from Zhejiang Laysun Magnetics ensures commercial and technical superiority.
Operating near major material refineries in Sichuan allows us to secure raw Neodymium, Praseodymium, Dysprosium, and Terbium at cost-effective rates, insulating our global clients from severe raw material pricing volatility.
We provide advanced corrosion-resistant surface coatings including multi-layer Ni-Cu-Ni, bright Zinc, chemical vapor deposited Parylene, and high-adhesion Epoxy, tested to survive 120-hour salt spray tests and HAST chambers.
Our GBD technology selectively introduces heavy rare earth elements (Dy/Tb) into magnet grain boundary layers, dramatically improving thermal demagnetization resistance while conserving scarce heavy rare earth resources.
Comprehensive magnetics metrics sheet for system design engineers and procurement departments.
| Material Grade | Remanence (Br) | Coercivity (Hcb) | Intrinsic Coercivity (Hcj) | Max Energy Product (BH)max | Max Operating Temp |
|---|---|---|---|---|---|
| N35 | 1.17 - 1.22 T (11.7 - 12.2 kG) | ≥ 868 kA/m (≥ 10.9 kOe) | ≥ 955 kA/m (≥ 12 kOe) | 263 - 287 kJ/m³ (33 - 36 MGOe) | 80°C (176°F) |
| N42 | 1.29 - 1.32 T (12.9 - 13.2 kG) | ≥ 923 kA/m (≥ 11.6 kOe) | ≥ 955 kA/m (≥ 12 kOe) | 318 - 342 kJ/m³ (40 - 43 MGOe) | 80°C (176°F) |
| N52 | 1.42 - 1.47 T (14.2 - 14.7 kG) | ≥ 796 kA/m (≥ 10.0 kOe) | ≥ 875 kA/m (≥ 11 kOe) | 398 - 422 kJ/m³ (50 - 53 MGOe) | 60°C (140°F) |
| N35SH | 1.17 - 1.22 T (11.7 - 12.2 kG) | ≥ 868 kA/m (≥ 10.9 kOe) | ≥ 1592 kA/m (≥ 20 kOe) | 263 - 287 kJ/m³ (33 - 36 MGOe) | 150°C (302°F) |
| N40EH | 1.25 - 1.28 T (12.5 - 12.8 kG) | ≥ 955 kA/m (≥ 12.0 kOe) | ≥ 2387 kA/m (≥ 30 kOe) | 302 - 326 kJ/m³ (38 - 41 MGOe) | 200°C (392°F) |
Enabling cutting-edge engineering solutions across global industrial sectors with our customized 5x3mm Neodymium Magnets.
At Zhejiang Laysun Magnetics Ltd., quality control is embedded at every phase of the manufacturing process. Our facility operates under tight international industrial standards to supply the most demanding environments, including chemical plants, automotive production lines, and cleanrooms. We hold certifications for:
Our Quality Assurance lab is equipped with advanced testing machines including Demagnetization curve tracers (hysteresisgraphs), ICP-OES chemical component analyzers, laser particle size analyzers for powder control, and automated optical scanners for rapid 3D dimension verification.
Headquartered in Hangzhou, China, Eneroc is building our worldwide subsidiaries and offices to serve our customers globally.
Key parameters and specifications procurement managers must outline when requesting OEM volume quotes.
Clearly state the target performance grade (e.g., N35 for budget, N52 for max force, or N42H for higher operating temperatures). Specify the magnetization direction—most 5x3mm discs are magnetized axially (through the 3mm thickness), though diametrical magnetization is available for rotary sensor applications.
For indoor consumer electronic applications, standard Ni-Cu-Ni or Zinc is cost-effective. For humid or chemically demanding environments, request Black Epoxy, Resin-sealed, or Gold coatings to prevent corrosion and oxidation over time.
Our standard production maintains ±0.05mm tolerance. If you are inserting magnets into precision-molded plastic parts or metal assemblies via automated robotics, request our precision ground option offering up to ±0.02mm.
Neodymium magnets are classified as dangerous goods for air freight unless properly shielded. We package our shipments using high-density steel sheets and bubble packaging to neutralize external magnetic fields, enabling worry-free customs clearance and fast air transit.
Get instant answers to technical, logistical, and commercial queries regarding custom 5x3mm neodymium magnets.
For a standard axially magnetized 5x3mm disc magnet, the vertical pull force against a thick steel plate is approximately 0.45 kg (0.99 lbs) for N35 grade and up to 0.65 kg (1.43 lbs) for N52 grade. Real-world performance depends heavily on the surface roughness, material thickness, and air gap of the mating steel piece.
Raw NdFeB is highly susceptible to oxidation. We prevent this by applying a multi-layer protective surface finish. The most common coating is Ni-Cu-Ni (Nickel-Copper-Nickel), but we also supply Epoxy coatings (providing superior acid and solvent resistance), Zinc plating, Gold plating, and specialized passivated coatings.
Standard Neodymium magnets (N-grades) operate safely up to 80°C (176°F). However, if your application runs hotter, we can formulate our NdFeB with higher intrinsic coercivity. We supply M-grade (up to 100°C), H-grade (up to 120°C), SH-grade (up to 150°C), UH-grade (up to 180°C), and EH-grade (up to 200°C).
Because we are a large-scale manufacturer with an annual production of 5000 tons, our standard production MOQ for small 5x3mm magnets starts at 10,000 units. For prototype testing runs or initial design evaluations, please contact our engineering desk to discuss partial batch allocations.
Explore additional high-performance configurations including disc, ring, block, and segment profiles.
Need high-volume pricing for the 5x3mm Neodymium Magnet or a customized dimension? Submit your request and our engineering sales desk will contact you within 24 hours.
Laysun Magnetics