Explore our primary selection of custom-engineered sintered and bonded NdFeB permanent magnets optimized for automotive, smart robotics, and aerospace actuators.
Since our founding in 1999, Zhejiang Laysun Magnetics Ltd. has operated at the absolute forefront of advanced rare earth permanent magnet engineering. From our 100,000 square meter intelligent manufacturing facility in Sichuan, we process high-grade NdFeB magnets that sustain global value chains in renewable energy, industrial motor technologies, automated robotics, and critical automotive applications.
When engineering high-density magnetic configurations, component sizing represents a critical design trade-off between mechanical payload constraints and necessary flux field outputs. The Neodymium Magnet 20x6x2 mm (20mm Length x 6mm Width x 2mm Thickness) has emerged as an industry-standard rectangular block design. Its highly optimized geometry serves modern electromechanical architectures needing high surface field intensity inside ultra-low-profile enclosures.
In high-speed automated assembly processes, dimensional deviation can cause mechanical interference or structural bonding failures. Zhejiang Laysun Magnetics utilizes high-precision internal slicing and double-disc grinding machinery to achieve tight geometric tolerances of ±0.05mm (or custom limits to ±0.02mm upon specification). This strict process capability index (Cpk > 1.67) protects structural integrity across high-speed dynamic assemblies.
Sintered NdFeB is intrinsically susceptible to oxidation due to its rich iron phase, making high-performance surface treatments critical for operational life. We offer a comprehensive suite of protective coatings engineered for specific operational environments:
The standard industrial choice. Provides excellent resistance against humidity, offering over 48 to 96 hours in Salt Spray Testing (SST). Ideal for standard indoor electronic modules and structural housings.
Designed for damp, marine, or chemical-rich environments. The epoxy layer isolates raw rare-earth phases from corrosive solvents, achieving over 240 hours of continuous salt spray survival.
Parylene deposition offers outstanding dielectric strength, electrical isolation, and biocompatibility. Zinc (Zn) offers a cost-competitive solution for industrial structural assemblies.
| Material Grade | Remanence (Br) | Coercivity (Hcb) | Intrinsic Coercivity (Hcj) | Max Energy Product (BH)max | Max Operating Temp |
|---|---|---|---|---|---|
| N35 | 1.17 - 1.22 T | ≥ 868 kA/m | ≥ 955 kA/m | 263 - 287 kJ/m³ | 80 °C |
| N42 | 1.29 - 1.32 T | ≥ 923 kA/m | ≥ 955 kA/m | 318 - 342 kJ/m³ | 80 °C |
| N52 | 1.42 - 1.47 T | ≥ 923 kA/m | ≥ 875 kA/m | 398 - 422 kJ/m³ | 60 - 80 °C |
| 35SH | 1.17 - 1.22 T | ≥ 883 kA/m | ≥ 1592 kA/m | 263 - 287 kJ/m³ | 150 °C |
| 42UH | 1.29 - 1.32 T | ≥ 955 kA/m | ≥ 1990 kA/m | 318 - 342 kJ/m³ | 180 °C |
| 38EH | 1.22 - 1.25 T | ≥ 987 kA/m | ≥ 2388 kA/m | 287 - 310 kJ/m³ | 200 °C |
Watch our corporate workflow processes and check our physical facilities. Zhejiang Laysun Magnetics prioritizes transparency, modern processing lines, and extensive quality control steps across raw material inputs and customized NdFeB runs.
Sintering and Annealing Facility
High-Precision Slicing Workshop
The rare earth permanent magnet sector is navigating structural shifts driven by global decarbonization initiatives and advanced automation demands. Our business intelligence groups have identified four critical trends affecting procurement criteria for 20x6x2mm neodymium components:
Automotive subsystems—such as Electronic Power Steering (EPS), Electronic Throttle Controls (ETC), and smart valve actuators—are shifting toward brushless DC (BLDC) topologies. The 20x6x2 block format provides the low profile required for space-constrained surface-mounted rotor slots while ensuring sufficient holding and driving torque.
Collaborative robots (cobots) and automated guided vehicles (AGVs) require light, highly dynamic brushless motors. Utilizing high-coercivity grades like 42SH or 38UH in the 20x6x2 scale allows design engineers to optimize power-to-weight ratios in articulation joints and propulsion motors.
From advanced camera auto-focus modules in high-end mobile devices to precision linear actuators in medical hardware, the thin 2mm cross-section of the 20x6x2 block fits neatly within micro-assemblies, providing reliable magnetic response cycles.
Modern supply chain managers are shifting from single-source buying to risk-diversified procurement partnerships. Ensuring a stable source of heavy rare earth elements (HREEs) like Dysprosium (Dy) and Terbium (Tb) is critical to stabilizing price points and delivery schedules. By establishing long-term resource contracts, Zhejiang Laysun Magnetics guarantees stable material costs and reliable delivery schedules during market cycles.
Operating a 100,000 m² advanced manufacturing facility allows Zhejiang Laysun Magnetics Ltd. to integrate high-efficiency automated processing with strict quality assurance systems. Our manufacturing footprint adopts the Chinese Factory 4.0 standard to control costs and ensure structural component precision:
Vacuum sintering processes are monitored using closed-loop sensor nodes that adjust cooling rates and temperature curves in real-time. This eliminates crystal grain size variability and prevents internal structural defects.
For high-coercivity high-temperature setups (such as UH, EH, or AH grades), GBD technology diffuses Dysprosium (Dy) or Terbium (Tb) into the crystalline boundaries. This reduces heavy rare earth consumption, optimizing material costs while maintaining high demagnetization resistance.
Finished magnet dimensions and surface coatings undergo automated visual sorting using high-resolution digital cameras. Units displaying microscopic cracks, pinholes, or dimensional variations are rejected before shipping.
The practical versatility of 20x6x2mm neodymium magnets spans across major geographic industrial centers:
Integrated into magnetic sensors, rotary encoders, and mechanical safety switches on CNC machining centers. High mechanical stability and exact tolerances are necessary to prevent sensing errors.
Employed in interior cabin controls, smart locks, and micro-pumps. High coercivity grades (such as SH or UH) ensure reliable performance in fluctuating engine bay temperatures.
Utilized in magnetic phone cases, Magsafe accessories, and micro-audio transducers. Optimized nickel coatings prevent cosmetic degradation and rust from contact with skin oils.
We provide comprehensive technical assistance from product conception through series production. Our custom engineering capabilities allow customers to specify magnetizing directions (axial, thickness-wise, multi-pole), choose custom surface treatments, and select high-temperature material blends. We also support complete production documentation processes, providing material validation reports, dimensional mapping, and demagnetization profiles.
Our factory operations adhere to strict international quality standards, including ISO9001, ISO14001, OHSAS18001, and IATF 16949 automotive criteria. These framework systems cover raw material validation, manufacturing processes, and finished product inspection.
ISO 9001:2015 Certification
ISO 14001 Environmental Management
SGS & RoHS Compliance Standards
Find answers to typical engineering, safety, and supply chain queries regarding custom NdFeB magnet specifications:
The pull force depends heavily on the grade of material (e.g., N35 vs. N52) and the mating substrate. Under ideal conditions (pulling perpendicularly from a flat, polished mild steel plate), a standard N35 grade 20x6x2mm block exhibits a holding force of approximately 1.5 to 1.8 kg. Opting for N52 increases this to roughly 2.2 kg. Actual holding force will vary based on air gaps, surface roughness, and steel thickness.
The most common magnetization direction is axial (thickness-wise), where the North and South poles are located on the two flat 20x6mm faces. However, upon request, they can be magnetized along their width (6mm direction) or length (20mm direction), or custom-configured with multi-pole magnetization for specialized sensing applications.
Sintered neodymium contains free iron phases that oxidize easily. To prevent corrosion, we apply surface coatings such as triple-layer Ni-Cu-Ni or organic coatings like epoxy or Parylene. For marine or high-humidity settings, we recommend epoxy or Parylene, which isolate the rare-earth core from moisture and chemical attack.
Standard N-grade magnets (e.g., N35 or N52) are rated for temperatures up to 80°C. Exceeding this thermal threshold leads to permanent demagnetization. For higher operating temperatures, we formulate magnets using specialized thermal grades, including M (up to 100°C), H (up to 120°C), SH (up to 150°C), UH (up to 180°C), or EH (up to 200°C).
According to IATA Packing Instruction 953, magnet shipments by air must not display a magnetic field strength exceeding 0.00525 gauss at a distance of 4.6 meters from any point on the package. To comply with these rules, we package air transport shipments with steel sheet shielding to contain the magnetic field within the shipping box.
For custom OEM orders, production lead time ranges between 20 and 30 days. This timeline accounts for raw material blending, vacuum sintering, wire cutting or slicing, surface plating, magnetization, and QA testing. Standard shapes in stock can be dispatched within 3 to 7 working days.
Partner with Zhejiang Laysun Magnetics Ltd. for high-precision rare earth magnet supplies. Submit your technical requirements, dimensional tolerances, and expected order volumes, and our engineering team will provide a comprehensive quotation within 24 hours.
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Laysun Magnetics