1. Product Overview  

NdFeB special-shaped magnets redefine high-performance magnetic applications through unique geometric flexibility and precise magnetic circuit design, supporting fully customized forms. Their multi-pole magnetization and complex structural engineering enable accurate magnetic field control, making them indispensable in cutting-edge fields like medical microsystems and robotic joints.  

2. Technical Parameters  

- Product Name: NdFeB Special-Shaped Magnets  

- Magnet Grade: N40 (Br ≥13.5 kGs, Hcj ≥10.8 kOe)  

- Dimensions: Y13mm *54mm*10mm (Customizable)  

- Dimensional Tolerances: L±0.05mm, W±0.05mm, T±0.05mm  

- Operating Temperature: ≤80°C (High-temp versions available)  

- Density≥7.5 g/cm³  

- Surface Magnetic Field: 3,800 Gs ±200 Gs (TM-801 Gauss Meter)  

- Flux Value: 2.0 mWb (Fluxmeter-tested)  

3. Manufacturing Process

The product is manufactured through the following key processes:

Wire Cutting: Uses molybdenum/copper wire cutting equipment to achieve ±0.02mm precision for small-batch custom rings.

Centerless Grinding: Refines inner and outer diameters to ensure roundness (±0.05mm tolerance).

Double-Disc Grinding: Controls thickness and parallelism.

4. Surface Treatment & Plating

To enhance corrosion resistance and appearance quality, the following surface treatment solutions are adopted:

Default Coating: Triple-layer nickel-copper-nickel (Ni-Cu-Ni). Coating can be customized according to customer requirements.

Coating Thickness Standard: Ni (3μm) + Cu (5μm) + Ni (4μm). Coating thickness can be customized as needed.

Optional Coating: Single-layer zinc (Zn 5μm) for cost-sensitive projects.

5. Appearance & Dimensional Inspection  

Quality control protocol:  

- Manual inspection (micrometer/caliper)  

- Visual inspection (800-1,200 lux, 20-750px distance)  

- 2D optical measurement (irregular geometries)  

6. Reliability Testing

Environmental Adaptability Testing

Temperature Resistance Test: Magnets are subjected to extreme temperature conditions, typically through thermal cycling between -40°C and +80°C, to assess changes in magnetic and physical properties.

Humidity Exposure Test: Magnets are placed in environments with high relative humidity (≥ 90%) for a specified duration to evaluate any signs of rust, corrosion, or degradation in magnetic performance.

Salt Spray Test: To simulate harsh conditions such as coastal environments, magnets are exposed to salt spray atmospheres to examine their corrosion resistance and long-term durability.

7. Packaging Process

Magnetic-safe packaging:  

 Reject defective items  

 Magnetize & align conforming products  

 Custom quantitation/labeling per box  

 Vacuum sealing + magnetic shields/buffer pads  

 Moisture/collision/interference-proof master carton  

8. Application Fields  

- Automotive: Sensors (crankshaft/camshaft), solenoids, motors  

- Consumer Electronics: Acoustic devices, wearables  

- Medical: MRI systems, minimally invasive surgical robots  

- Aerospace & Defense: Satellite attitude control, drone motors  

9. Usage Precautions  

- Handling: Avoid drops/impacts (brittle material)  

- Safety: Use sliding motion (pinch hazard prevention)  

- Installation: Verify polarity via size markings  

- Storage: Dry environment; avoid heat/acids/alkalis  

- Isolation: >750px from pacemakers/HDDs/IC cards  

10. Customization & Services  

- Dimensions/shapes/coatings (layers, thickness, color)  

- Polarity/magnetic strength customization  

- Laser marking (logos/serial numbers)  

- Application-specific encapsulation & pull-force testing  

11.Why choose Jinconn magnet

As an industry leader in high-performance magnetic materials, Dongguan Jinconn New Materials Holdings Co., Ltd has core products widely applied in new energy vehicle drive systems, intelligent manufacturing precision components, 5G communication equipment, industrial automation control modules, and high-end medical devices. With excellent performance and stable quality, these products have gained the trust of high-end customers at home and abroad.

The company focuses on R&D, production, and sales of magnetic materials, committed to building an "R&D-production-application" ecological chain through technological innovation, empowering the global intelligent industry, and striving to become an industry benchmark.

We are pleased to offer free customized magnet solutions tailored to your specific needs.

If you require samples, technical datasheets, or certifications such as MSDS, RoHS, ISO 9001, QC080000, IATF 16949, ISO 14001, or ISO 27001, our sales engineers are ready to assist you.