1. Product Overview

Magnets for smart earphones typically use high-performance sintered NdFeB micro magnets. They are characterized by small size, strong magnetic force, and high precision, developed specifically for TWS Bluetooth earphones, magnetic charging cases, magnetic ear hooks, and internal audio unit components. These magnets are precisely designed to meet comprehensive requirements for suction, positioning accuracy, electroacoustic performance, and ease of assembly. They support custom shapes (e.g., oval, strip, square, disc) and various coatings (e.g., Ni, epoxy, metallic coatings), and are widely used in consumer-grade smart wearable devices.

2. Technical Specifications

Product Name: Magnet for Smart Earphones
Magnetic Material Grade: N48M (Br≥14.8KGs, Hcj≥10.5KOe)
Product Dimensions:

Tolerance: Length ±0.05mm, Width ±0.05mm, Thickness ±0.05mm
Working Temperature: ≤ (high-temperature versions available)
Density: ≥7.5g/cm³
Magnetic Field Strength (Surface Gauss): (Measured using Japanese TM-801 Gaussmeter)
Magnetic Flux Value: (Measured with fluxmeter)

3. Manufacturing Process

• Profile Cutting: Performed using specialized non-standard wire cutting for non-square/circular geometries.

• Grinding: Applied for complex shapes and precision contour finishing to ensure dimensional and geometric tolerance.

• Demagnetization & Charging: Initial demagnetization followed by precise magnetization to prevent deviation after assembly.

• Laser Engraving: N-pole marking, customizable with logos or serial codes.

4. Surface Treatment and Coating Technology

• Epoxy Coating: Provides additional chemical resistance and waterproofing, suitable for high humidity environments.

• Ni-Cu-Ni Plating: Standard triple-layer electroplating structure, balances appearance and corrosion resistance. Suitable for general industrial and electronic applications.

  ‍

5. Appearance and Dimensional Inspection Standards

• Manual Measurement: Using calipers/micrometers to verify dimensions, ensuring compliance with design specifications.

• Visual Inspection: Observing under standard lighting to detect cracks, defects, and foreign materials.

• 2D Image Measuring System: High-resolution, non-contact equipment for precise measurement of irregular shapes.

• CCD Smart Screening Equipment: Automated detection and sorting using high-speed image recognition to improve efficiency and reduce human error.

• Magnetic Flux Consistency Test: Ensures stable magnetic performance across batches using professional instruments.

  ‍

6. Reliability Testing

• Impact and Vibration Tests: Simulate shocks and vibrations during transport and use to ensure operational reliability.

• High Temperature Demagnetization Test: Verifies magnetic stability under high temperature for long-term performance.

• Damp Heat Test: Assesses resistance to humidity and corrosion in high-moisture environments.

  ‍

7. Packaging and Transportation

• Screening: Eliminate defective items based on appearance and dimensions.

• Magnetizing and Alignment: Uniform magnetization and neat packaging as per customer requirements.

• Vacuum Packaging: Protects against moisture and magnetic interference.

• Outer Packaging: Shockproof, moisture-proof, and anti-magnetic interference boxes to ensure transportation safety.

  ‍

8. Application Fields

• TWS Bluetooth Earphones (magnetic lid and earphone ends)

• Magnetic Charging Interfaces (Type-C magnetic connectors)

• Built-in Micro Speaker Magnetic Circuits

• Ear Hook Headphones and Magnetic Fixators

• Magnetic Connection Components for Smart Bands/Ear Hook Devices

  ‍

9. Usage Precautions

• Handling: NdFeB is hard but brittle; avoid dropping, collisions, or scratches.

• Safe Operation: Due to strong magnetism, avoid bending—slide to separate to prevent pinching.

• Correct Installation: Follow polarity markings for proper installation to ensure device function.

• Storage Requirements: Store away from heat, moisture, and corrosive environments.

• Isolation: Keep away from hard drives, IC cards, and pacemakers due to strong magnetic interference.

  ‍

10. Customization and Services

We offer full customization of magnet dimensions, shapes, and coatings—including layer count, thickness, and color finish.
Magnetic pole orientation and strength can be tailored to your specific requirements.
Laser engraving is available for branding (logo) or serial number marking.
For specialized applications, we design tailored packaging solutions and perform pull-force testing to ensure optimal performance.

11. Why choose Jinconn Magnet

Dongguan Jinkun New Materials Holdings Co., Ltd. is a publicly listed company on the New Third Board and a comprehensive service provider integrating the R&D, production, and sales of rare earth magnets and application solutions. With extensive experience in the development and manufacturing of magnetic materials, the company has established a complete and robust supply chain system.

The factory is located in Xiahe Industrial Zone, Daojiao Town, Dongguan City, strategically based in the Pearl River Delta to serve customers across China and around the world.

The company has been honored with the titles of "Guangdong Provincial Manufacturing Champion" and "Dongguan City Manufacturing Champion."

We are dedicated to providing magnetic material solutions that are widely applied in various industries, including new energy vehicles, intelligent manufacturing, and electronic communications. With cutting-edge technology and consistent quality, we have earned strong recognition from customers worldwide.

If you require samples, technical specifications, or certifications such as MSDS, RoHS, ISO 9001, QC080000, IATF 16949, ISO 14001, or ISO 27001, please contact our sales engineers — we are here to support you with prompt and professional service.