Explore our premium catalog of engineered sintered Neodymium-Iron-Boron (NdFeB) magnet configurations manufactured to ISO/TS16949 standards for critical global applications.
In modern industrial magnetics, the 40x20x10 mm block neodymium magnet represents one of the most versatile standard rectangular profiles. Engineered from a precise alloy matrix of Neodymium (Nd), Iron (Fe), and Boron (B) arranged in the tetragonal Nd₂Fe₁₄B crystal structure, this exact geometry yields an optimal ratio between pole surface area (40mm x 20mm = 800 mm²) and magnetic thickness (10mm).
When magnetized axially through the 10mm thickness, a single Grade N52 block delivers a theoretical vertical magnetic pull force exceeding 28.5 kg (62.8 lbs) against a smooth mild steel plate under ambient laboratory conditions. The inherent magnetic saturation capability of Zhejiang Laysun Magnetics Ltd.'s high-grade material ensures that design engineers receive maximum flux density within minimal spatial footprints.
| Magnet Grade | Residual Induction (Br) | Coercivity (Hcb) | Intrinsic Coercivity (Hcj) | Max Energy Product (BHmax) | Max Temp (°C) |
|---|---|---|---|---|---|
| N35 | 1.17 - 1.22 T (11.7 - 12.2 kG) | ≥ 868 kA/m (≥ 10.9 kOe) | ≥ 955 kA/m (≥ 12.0 kOe) | 263 - 287 kJ/m³ (33 - 36 MGOe) | 80 °C (176 °F) |
| N42 | 1.28 - 1.32 T (12.8 - 13.2 kG) | ≥ 915 kA/m (≥ 11.5 kOe) | ≥ 955 kA/m (≥ 12.0 kOe) | 318 - 342 kJ/m³ (40 - 43 MGOe) | 80 °C (176 °F) |
| N52 (Ultra High) | 1.42 - 1.47 T (14.2 - 14.7 kG) | ≥ 836 kA/m (≥ 10.5 kOe) | ≥ 875 kA/m (≥ 11.0 kOe) | 398 - 422 kJ/m³ (50 - 53 MGOe) | 70 °C (158 °F) |
| N38SH (High Temp) | 1.22 - 1.26 T (12.2 - 12.6 kG) | ≥ 939 kA/m (≥ 11.8 kOe) | ≥ 1592 kA/m (≥ 20.0 kOe) | 286 - 310 kJ/m³ (36 - 39 MGOe) | 150 °C (302 °F) |
| N45UH (Ultra High Temp) | 1.32 - 1.36 T (13.2 - 13.6 kG) | ≥ 995 kA/m (≥ 12.5 kOe) | ≥ 1990 kA/m (≥ 25.0 kOe) | 342 - 366 kJ/m³ (43 - 46 MGOe) | 180 °C (356 °F) |
| N35EH (Extreme Temp) | 1.17 - 1.22 T (11.7 - 12.2 kG) | ≥ 955 kA/m (≥ 12.0 kOe) | ≥ 2387 kA/m (≥ 30.0 kOe) | 263 - 287 kJ/m³ (33 - 36 MGOe) | 200 °C (392 °F) |
Because rare earth NdFeB alloys contain a rich iron phase, unshielded blocks are highly susceptible to atmospheric oxidation and moisture degradation. Zhejiang Laysun Magnetics Ltd. applies advanced multi-layer electroplating and organic polymer encapsulation designed to exceed industrial environmental standards:
Standard OEM choice. Provides metallic silver finish, thickness 15-25μm, salt spray resistance (SST) passing 48 to 96 hours. Ideal for indoor automation and motor housings.
Provides superior chemical and salt-water dielectric protection. Thickness 15-30μm, withstands over 240-500 hours of continuous salt spray test. Perfect for marine and subsea applications.
Cost-effective protective coating, layer thickness 8-15μm. Offers excellent adhesion for overmolding and structural adhesive bonding in automotive assemblies.
Established in 1999, Zhejiang Laysun Magnetics Ltd. has evolved over 25+ years into a national high-tech enterprise at the forefront of advanced magnetic materials innovation. Headquartered in Hangzhou with a massive state-of-the-art production hub in Suining, Sichuan, Laysun bridges cutting-edge materials science with global supply chain reliability.
Our Suining facility integrates the full manufacturing chain—from vacuum induction melting (VIM), strip casting, and jet milling powder preparation to inert atmosphere orientation pressing, sintering, automated multi-axis grinding, and ultrasonic electroplating. We maintain rigid alignment with global management systems including ISO 9001:2015, ISO 14001:2015, ISO 45001 / ISO 18001, API 6D, and CE standards.
100% magnetic flux inspection via automated hysteresisgraphs, X-ray fluorescence (XRF) coating thickness analyzers, and laser optical flash measuring systems guaranteeing dimensional tolerances as tight as ±0.01mm.
Dedicated engineering laboratory focusing on Dysprosium (Dy) and Terbium (Tb) Grain Boundary Diffusion (GBD) technologies to optimize high-coercivity magnets while reducing raw material overheads.
Due to its robust rectangular force profile, the 40x20x10mm Neodymium block serves as a cornerstone component across leading high-tech industrial sectors worldwide:
Integrated into Electric Power Steering (EPS) motors, regenerative braking assemblies, and high-rpm brushless DC (BLDC) rotor stators requiring high temperature grades (SH, UH, EH) for operational durability under intense thermal loads.
Utilized in heavy-duty voice coil actuators, linear motion positioners, high-end acoustic subwoofers, and precision optical focus mechanisms where uniform magnetic field gradients are essential.
Employed in magnetic grippers, robotic end-effectors, automated guided vehicles (AGV) drive motors, magnetic levitation tracks, and high-torque magnetic couplings for chemical fluid containment.
Forming the magnetic flux heart of direct-drive wind turbine generators, micro-hydro alternators, and kinetic energy recovery systems (KERS) maximizing energy conversion efficiency.
Securing competitive quotations for China Neodymium Magnet 40x20x10 mm supplies requires an understanding of rare earth cost structures. Key commercial pricing drivers include:
| Grade Designation | MOQ (Units) | Est. Unit Price Range (FOB China) | Recommended Coating | Lead Time (Days) |
|---|---|---|---|---|
| N35 Standard | 1,000 units | $1.45 - $1.85 / pc | Ni-Cu-Ni / Zinc | 10 - 14 Days |
| N52 Ultra High | 1,000 units | $2.10 - $2.65 / pc | Triple Ni-Cu-Ni | 12 - 15 Days |
| N38SH High Temp (150°C) | 500 units | $2.40 - $3.10 / pc | Ni-Cu-Ni / Epoxy | 14 - 18 Days |
| N45UH High Temp (180°C) | 500 units | $2.95 - $3.80 / pc | Black Epoxy | 15 - 20 Days |
*Note: Prices vary dynamically based on Shanghai Metals Market (SMM) rare earth metal spot indexes. Inquire with our sales team for formal real-time quotes.
As global industries transition toward electrified transportation and industrial automation, Zhejiang Laysun Magnetics Ltd. is pioneering technological breakthroughs aimed at increasing performance while advancing environmental sustainability:
By diffusing Heavy Rare Earths (Dy/Tb) selectively along grain boundaries rather than alloy bulk, we reduce heavy rare earth usage by up to 60% while achieving UH and EH coercivity levels.
Advanced grain refinement processes yield microstructures with grain sizes under 3 μm, drastically improving thermal stability and limiting magnetic decay to less than 1% over 10 years under max operating limits.
Implementing closed-loop recycling of NdFeB sludge and scrap during precision grinding, recovering upwards of 95% of rare earth elements back into high-grade sintered magnet production.
Explore our extensive range of engineered magnetic assemblies, pot magnets, disc shapes, arc segments, and rubber-coated products.
Empower your technology with our high-grade sintered Neodymium block magnets. Contact our technical team today to request instant engineered drawings, magnetic field simulations, or customized B2B price quotes.
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