NdFeB Rare Earth Disc Magnet

When a simple, round form factor is required, the NdFeB Rare Earth Disc Magnet is the go‑to solution for engineers and designers. Sintered from high‑purity neodymium, iron, and boron (purity ≥95%, no recycled materials), these disc magnets pack an extremely high magnetic energy product (up to 52 MGOe) into a low‑profile shape. This makes them ideal for holding assemblies, magnetic sensors, reed switches, loudspeakers, magnetic therapy devices, and countless other applications where a strong, stable magnetic field is needed in a small footprint. Our vertically integrated factory produces NdFeB rare earth disc magnets with precise dimensional control: diameters from 3 mm to 150 mm, thicknesses from 0.5 mm to 50 mm, with tolerances as tight as ±0.02 mm. Standard Ni‑Cu‑Ni triple plating provides excellent corrosion resistance (72h+ salt spray), while epoxy, gold, or rubber coatings are available for specialized environments. We also offer high‑temperature grades (N35SH to N40UH) that maintain performance up to 200°C. Every disc is magnetized axially (through thickness) unless otherwise specified, with multi‑pole patterns available for encoder applications.

 

Why Choose Our NdFeB Disc Magnets

Precision Thickness & Diameter

Our double‑disc grinding and centerless grinding processes ensure parallel faces and consistent diameters. Standard tolerance ±0.03 mm; for high‑stack assemblies, we can achieve ±0.01 mm. Burr‑free edges prevent chipping during handling.

Full Grade Availability

From economical N35 to maximum‑energy N52. Need higher temperature? Choose N42SH (150°C), N40UH (180°C), or N35EH (200°C). We also offer SmCo discs for extreme temperatures up to 350°C.

Robust Coating Options

Ni‑Cu‑Ni triple layer (5‑7 μm per layer) – salt spray >72h. Black epoxy for electrical insulation and moderate corrosion resistance. Gold for medical devices. Rubber for anti‑slip or impact protection.

For NdFeB circular magnets, a three-layer coating is commonly applied. Nickel plating can be implemented as either a pure nickel layer or a multi-layer combination such as nickel‑copper‑nickel. This represents the most widely used plating solution for magnets. Conforming to industrial standards, it offers good process stability and provides sufficient corrosion protection in dry environments. However, it may cause allergic reactions in sensitive individuals.

With precision grinding and cutting, tolerances of +/-0.05mm can be achieved during the manufacturing process.

Our facility controls every step: vacuum induction melting using only certified virgin rare earths, jet milling to fine powder, isostatic pressing in a magnetic field, sintering and heat treatment in controlled atmosphere furnaces, precision grinding, automated Ni‑Cu‑Ni plating, and final magnetization. Each batch of NdFeB rare earth disc magnets is tested for magnetic flux (Helmholtz coil or Gauss meter), dimensional accuracy (vision system), and coating thickness (XRF). Salt‑spray samples are run per ASTM B117. Our IATF 16949 and ISO 9001 systems guarantee traceability and consistent quality, whether you order 100 or 1,000,000 pieces.

Disc magnets are individually wrapped in VCI paper and placed in foam‑lined 8‑cell inner boxes to prevent scratching and chipping. Outer cartons are reinforced for sea or air freight. Lead times: standard sizes 5‑7 days, custom dimensions 10‑15 days after approval. Free samples available for qualified projects. We support mixed orders and small MOQs.

Owing to their superior magnetic characteristics and dimensional accuracy, NdFeB circular magnets fulfill essential roles in diverse industries. In automotive applications, they support efficient sensors and compact motor designs. Consumer products rely on them for acoustic parts, vibration modules, and miniaturized drives. Industrial uses span magnetic couplings, precise positioning systems, and automated sorting machinery. The renewable energy field incorporates these magnets into generator units and power conversion systems. Medical devices integrate them for imaging equipment and surgical tools. Their uniform magnetic flux and structural robustness make them ideal for scenarios demanding steady torque, accurate detection, or dependable magnetic retention in tight spaces.