Explore our premium grade permanent magnetic components, custom-manufactured to strict aerospace, automotive, and industrial specs.
Understanding the physics, structural benefits, and performance limits of the industry's most versatile dimensional magnetic disc.
In the domain of magnetic circuit design, the dimensional ratio of a cylindrical or disc-shaped permanent magnet strongly dictates its permeance coefficient (Pc) and overall resistance to demagnetization. A 3/4" x 1/8" rare earth magnet (approximately 19.05 mm diameter by 3.175 mm thickness) has evolved as an industry standard. This specific geometry strikes an optimal balance between surface area—which maximizes flux integration with adjacent poles—and a low profile, crucial for compact electronic structures.
Due to the high remanence (Br) typical of sintered Neodymium-Iron-Boron (NdFeB), a disc of these proportions delivers remarkable holding and pull forces (often exceeding 10 lbs depending on grade and air-gap characteristics). However, designers must account for self-demagnetizing factors inherent to low-aspect-ratio shapes. Operating in high thermal or strong opposing external magnetic fields requires selecting elevated-coercivity grades (such as SH, UH, or EH variants) to ensure long-term stability.
Selecting the appropriate NdFeB grade is vital for optimal application performance. The basic N35 grade offers a cost-effective solution for ambient applications. For projects demanding high field density within the constrained 1/8" profile, grades such as N48, N50, or N52 represent the peak of available magnetic energy density (BH max).
For industrial environments where operating temperatures exceed 80°C (176°F), standard N-grade magnets risk irreversible demagnetization. Engineers must specify grades with higher intrinsic coercivity (Hcj):
Your trusted partner in the world of advanced magnetic solutions. Since our inception in 1999, we have grown to become a national high-tech leader.
Founded at the turn of the millennium, Zhejiang Laysun Magnetics Ltd. has evolved from a visionary startup into an industry pacesetter. Our state-of-the-art facility, sprawling across 100,000 square meters in the vibrant city of Suining, Sichuan, serves as the operational heart of our enterprise. Here, our dedicated staff and engineering teams combine advanced sintering technologies with modern QA procedures to consistently deliver high-performance magnets globally.
Our core focus is the development, research, production, and sales of high-grade permanent NdFeB magnets. Our client base spans crucial sectors, including electric vehicle drivetrains, industrial automation, computing hardware, consumer electronics, and renewable energy.
Optimizing lead times, material traceability, and quality management pipelines for high-performance supply chains.
Modern automated assembly systems require parts matching precise design values. We employ advanced cylindrical and double-disc grinding methods to reliably hold physical tolerances down to ±0.02 mm.
Because raw NdFeB is highly susceptible to atmospheric corrosion, we offer premium plating options, including Ni-Cu-Ni, epoxy resin, chemical vapor deposited Parylene, and specialized double-layer rubber coatings.
We provide full verification documentation, including demagnetization curves, magnetic flux mappings, salt spray testing data (up to 96 hours SST), and complete raw material chemical tracking.
Empowering global technologies from consumer electronics to advanced automation machinery.
The application of our 3/4" x 1/8" NdFeB magnets stretches far beyond basic hardware assemblies. In modern robotics and automation, they serve as the magnetic target in rotary encoders, tracking physical positioning with high angle accuracy. Their compact size makes them ideal for multi-axis robotic joints where weight reduction directly improves movement speed and power efficiency.
In electric vehicle (EV) ecosystems, specialized neodymium block, arc, and ring components actuate precise drive systems. This includes electronic power steering (EPS), water pump impellers, and auxiliary electric cabin motors. Working in these environments demands high thermal stability, requiring our UH and EH grade compounds to resist demagnetization under heavy thermal loads.
Fully certified manufacturing pipelines that meet API 6D, API 607, CE, ISO9001, ISO14001, and ISO18001 standards.
At Zhejiang Laysun Magnetics, quality assurance is integrated into every step of production. Our facility uses advanced laboratory equipment, including scanning electron microscopes (SEM), X-ray fluorescence coating thickness gauges, and automated hysterographs to trace demagnetization curves across varying temperatures.
Whether fulfilling military-grade specifications or supplying major consumer brands, we guarantee full compliance with RoHS, REACH, and environmental protection initiatives. If you require copies of our certifications (including ISO 9001, ISO 14001, TS16949, or CE), please contact our Hangzhou headquarters or regional support offices.
Next-generation permanent magnet solutions designed to withstand volatile resource availability and rising thermal demands.
A key focus in modern magnetics is reducing reliance on heavy rare earths like Dysprosium (Dy) and Terbium (Tb). These elements are critical for high-temperature stability, but their volatile pricing and limited supply create supply chain risks.
Zhejiang Laysun Magnetics is scaling Grain Boundary Diffusion (GBD) technology across our manufacturing lines. This process selectively diffuses Dy or Tb along the sintered NdFeB grain boundaries, rather than throughout the entire matrix. This method achieves high intrinsic coercivity (Hcj) while reducing heavy rare earth usage by up to 70%. The result is a cost-effective, thermal-resistant 3/4" x 1/8" magnet.
To support just-in-time manufacturing, we continue to expand our international footprint. Headquartered in Hangzhou, China, our sales and logistics divisions coordinate shipping, clearing, and distribution with regional hubs worldwide.
By maintaining inventory of standard sizes, including the 3/4" x 1/8" disc, we support rapid prototyping and automated safety-stock replenishment programs, minimizing production downtime for our clients.
Answers to critical engineering and procurement questions regarding NdFeB disc assemblies.
Need custom sizing, special coatings, or bulk wholesale pricing? Submit your email and product specifications. Our engineering support team will respond within 24 hours.
Explore our wider range of permanent rare earth NdFeB alloys, customized assemblies, and heavy-duty magnetic lifting machinery.
Laysun Magnetics
