Thumbtack NdFeB Magnet
2025-7-12
1.Product Overview
High strong Arc_Curved NdFeB Magnet , these magnets feature a Ni coating formed through precision wire cutting and oriented magnetization. The unique sector design enables efficient magnetic flux concentration, while the coating provides superior insulation and corrosion resistance. Ideal for space-constrained applications requiring precise magnetic field control, such as magnetic encoders, and medical imaging equipment.
2.Technical Parameters
Product Name | Thumbtack NdFeB Magnet |
Grade | N42 (Br ≥13.8 kGs, Hcj ≥12.4 kOe) |
Dimension | L25x10mm (C-65degree) |
Tolerance | L±0.05mm, W±0.05mm, T±0.05mm |
Operating Temperature | ≤80°C (High-temp version customizable) |
Density | ≥7.5 g/cm³ |
Surface Field | 2800Gauss (Measured with TM-801 Gauss meter) |
Magnetic Flux | 2.0 mWb (Fluxmeter tested) |
3. Manufacturing Process
Key production stages:
- Edge Reinforcement:
- Laser cladding with NiCrBSi alloy on edges enhances impact resistance.
- Curved Surface Adhesion Optimization:
- Plasma activation technology improves coating bonding strength.
- Multi-stage Magnetization:
- Radial magnetization with laser positioning marks reduces field uniformity error.
- Oriented magnetization via multi-pole magnetizing heads with sequential pulsing.
4. Surface Treatment & Plating
- Edge Reinforcement: Laser-clad nickel alloy at seams (prevents electrochemical corrosion).
- Edge Rounding: Minimizes magnetic field distortion.
- Standard Plating: Triple-layer Ni-Cu-Ni (customizable upon request).
- Plating Thickness: Ni(3μm) + Cu(5μm) + Ni(4μm) (adjustable).
- Electrophoretic Coating: Uniform corrosion-resistant decorative finish applied via electronics
5.Appearance & Dimensional Inspection
Quality control procedures:
- Manual measurement (micrometer/caliper)
- Visual inspection (800-1200 lux at 20-750px distance)
- Optical comparator for complex geometries
- CCD automated sorting for full appearance/dimension check
- Magnetic flux consistency verification
6. Reliability Testing
6.1 Environmental Adaptability
- Temperature cycling: -40°C to +80°C
- Humidity test: >90% RH exposure
Salt spray test: ASTM B117 standard
6.2 Aging Tests
- Natural aging (months/years)
- Accelerated aging (thermal/humidity/magnetic stress)
7.Packaging Process
- Defective unit removal
- Uniform magnetization and alignment
- Customized boxing/labeling
- Vacuum sealing with magnetic shielding & cushioning
- Moisture/impact/magnetic interference-proof master cartons
8.Shipping Options
Fastest method; ideal for urgent or high-value orders.
Shielding required to comply with IATA PI902 standards:
Magnetic field strength must not exceed 0.159 A/m (200 nT) at 4.6 m (15 ft) from the package
Typically done with iron/steel sheets or custom shielding enclosures.
Ideal for large quantities or heavy items (e.g., >100 kg).
More cost-effective, but slower.
No magnetic shielding requirement for ship cargo, but moisture control (e.g., VCI bags, desiccant) is essential.
9.Application Fields
Magnetic Sensors: Custom shapes can enhance the sensitivity and accuracy of magnetic sensors used in compasses, navigation systems, and scientific instruments.
Electric Motors and Generators: Polygonal magnets can improve the efficiency and performance of electric motors and generators by optimizing magnetic field distribution within the machine.
Magnetic Couplings: These magnets can be used in magnetic couplings to transmit torque between two rotating shafts without direct physical contact, thus eliminating the need for mechanical seals.
Magnetic Bearings: Polygonal magnets can be utilized in magnetic bearings, which support rotating shafts or components without the need for traditional mechanical bearings, reducing friction and wear.
10.Usage Precautions
- Handle with care: Avoid impacts/drops (NdFeB is brittle).
- Pinch hazard: Use sliding motion during handling.
- Polarity identification: Correct orientation prevents operational faults.
- Environmental protection: Store away from moisture/corrosives.
- EMI prevention: Keep away from pacemakers, credit cards, and electronics.
- Safety: Child-safety for small magnets; impact protection for industrial sizes.
- Corrosion management: Select coated versions for harsh environments.
11. Customization & Services
Supported options:
- Dimensions/shape/plating (layers, thickness, color)
- Polarity direction/magnetic strength
- Laser marking (logos/SNs)
- Application-specific packaging & pull force testing
Contact Us:
Phone: +86 18038225892
Email: helen@jinconn.com
Address: Xiaohe Industrial Zone, Daojiao Town, Dongguan City, Guangdong Province, China
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