Product Overview & Application Scenarios
These round countersunk magnets are manufactured from high-grade sintered NdFeB (Neodymium Iron Boron) and are designed to deliver high holding force, excellent torque resistance, and reliable long-term performance. The countersunk mounting hole enables secure, flush installation with standard fasteners, ensuring both mechanical stability and precise positioning in structural assemblies.
Benefiting from the high energy density of NdFeB materials, these magnets provide strong magnetic output even in compact dimensions, making them ideal for applications where space efficiency and holding strength are critical. Precision machining ensures tight dimensional tolerances, consistent countersunk geometry, and stable performance across production batches.
Reliability Test
Salt Spray Test (Corrosion Resistance Test)
Salt spray testing is conducted in accordance with relevant industry standards to evaluate the corrosion resistance of the protective coating. After exposure, the surface condition and coating integrity are inspected to ensure the magnet maintains stable performance in corrosive or marine-like environments.
Thermal Cycling / Thermal Shock Test
The magnets are exposed to repeated high- and low-temperature cycles to assess resistance to rapid temperature changes. This test evaluates dimensional stability, coating adhesion, and magnetic performance under thermal expansion and contraction stress.
Magnetic Stability & Flux Loss Test
Magnetic flux and key magnetic parameters are measured before and after environmental and mechanical testing. Any changes in magnetic performance are recorded to confirm long-term magnetic stability and minimal flux loss under specified operating conditions.
Packaging & Transportation
● Magnetic shielding or demagnetization is applied if required by transport regulations.
● Individual magnets are isolated using plastic trays or foam inserts.
● Moisture-proof bags with desiccants are used to prevent corrosion.
● Reinforced export cartons or pallets are applied for long-distance shipment.
● Shipping labels comply with international logistics requirements.
Compliance & Sustainability
We place strong emphasis on regulatory compliance and sustainable development. Our NdFeB magnets comply with RoHS and REACH requirements, and relevant declarations and test reports can be provided upon request.
We are committed to responsible sourcing and traceability of rare earth materials through controlled supply chain management, helping reduce supply risks and improve transparency. By adopting heavy rare earth reduction technologies such as grain boundary diffusion, we minimize the use of Dy and Tb while maintaining high-temperature performance and magnetic stability, supporting more sustainable and future-ready magnetic solutions.
FAQ
Q1. How does coating thickness variation affect magnetic performance?
Answer:Thicker coatings increase the effective air gap, slightly reducing surface flux density. Uneven coating thickness can also lead to inconsistent assembly performance, particularly in precision motor applications.
Q2. Why is chamfer or radius design recommended even when not functionally required?
Answer:Chamfers reduce edge chipping during handling, lower stress concentration, improve coating coverage, and reduce corner demagnetization risk. They significantly improve yield and long-term reliability with minimal cost impact.
Q3. How does magnet flatness impact motor vibration and noise?
Answer:Poor flatness causes uneven air gaps, resulting in flux density variation and torque ripple. This can lead to increased vibration and audible noise, especially in high-speed motors.
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