Premium black epoxy coating Square countersunk Neodymium Magnet

1. Product Overview & Application Scenarios

This industrial grade corrosion resistant fast response premium black epoxy coating Square countersunk Neodymium Magnet  is crafted from premium rare earth materials, offering exceptional magnetic performance and extremely strong holding force. The innovative square design with a central through-hole allows for easy installation with bolts or shafts, greatly enhancing assembly flexibility and structural stability. Its surface is treated with advanced anti-corrosion coating, providing excellent resistance to oxidation and moisture, thus extending the magnet’s service life. With outstanding high-temperature resistance, it maintains stable magnetic properties even under harsh operating conditions. Widely used in industrial automation equipment, motor drive systems, sensor mounting, and precision instruments, this Premium engineering high torque thermal stability  black epoxy coating Square countersunk Neodymium Magnet delivers high energy density, superior durability, and convenient installation—making it the ideal choice for efficient connection and reliable fastening solutions.

Application Scenarios

Micro Motors & Micro Drive Systems

Brushless DC motors (BLDC)

Miniature servo motors

High-speed micro spindles
✅ Reason: Compact size with strong magnetic performance enables high torque in miniature systems.

Medical Devices & Instruments

Surgical navigation tools

Magnetic micro-actuators

Drug delivery pumps
✅ Reason: Precision shape and high reliability in clean, low-noise environments.

 Precision Sensors & Encoders

Angular and linear position sensors

Magnetic Hall effect sensors

Miniature optical encoder magnet rings
✅ Reason: Stable magnetic field ideal for signal precision and sensor sensitivity.

2. Technical Specifications

- Product Name: Premium black epoxy coating Square countersunk Neodymium Magnet

- Magnet Grade: N52 (Br ≥14.2 kGs, Hcj ≥12 kOe)

- Dimension: L10x6x4mm

- Dimensional Tolerance: +/-0.05 

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

- Density: ≥7.5 g/cm³  

- Surface Magnetic Field: 3,500 Gs  

- Magnetic Flux : 2.0 mWb  (Fluxmeter-tested)  

3. Surface Treatment & Coating Technology

To enhance this customized industrial grade premium quality high magnetic force heat Resistant high energy density stable strong black epoxy coating Square countersunk Neodymium Magnet’ s corrosion resistance, surface quality, and magnetic stability, the following treatments are used:

Edge Reinforcement: Laser cladding with nickel-based alloy at magnet seams (prevents electrochemical corrosion)

Edge Rounding: Reduces magnetic field distortion

Default Coating: Triple layer Ni-Cu-Ni (customizable)

Standard Thickness: Ni (3μm) + Cu (5μm) + Ni (4μm)

Optional Coatings: Gold or silver plating for better conductivity and corrosion resistance

4. Reliability Testing

Impact & Vibration Test: Simulates shipping and usage conditions to ensure operational stability.

Constant Temperature & Humidity Test: Performed under 85°C and 85% RH for 96–500 hours. Performance and appearance are compared before and after testing.

Damp Heat Test: Evaluates resistance to high humidity and corrosion

5. Packaging & Transportation

Defect Elimination: 100% inspection using calipers, projectors, visual checks, and automated systems to reject cracked, chipped, oxidized, or coated-defective magnets.

Uniform Magnetization & Structured Arrangement: Magnets are uniformly magnetized and arranged for optimal packaging based on customer requirements to ensure performance and facilitate automated assembly.

Vacuum Sealed Packaging: Multi-layer vacuum sealing with moisture barriers, desiccants or nitrogen, prevents corrosion and magnetic interference during storage and shipping.

Customized Outer Packaging: Shock-proof, moisture-resistant, and anti-magnetic leakage packaging (e.g., multilayer cartons, plastic boxes, metal shielding) ensures compliance with international logistics standards. Each box includes a product list, labels, and tracking codes.

6. Why Choose us ？

Dongguan Jinconn New Material Holdings  Co., Ltd. is a publicly listed enterprise offering integrated R&D, manufacturing, and sales of rare earth magnets. Based in Xiaohe Industrial Zone, Daojiao Town, Dongguan, we serve clients across China and globally.

⭐20+ years of magnet manufacturing expertise

⭐Strict quality control & customization capability

⭐Multilingual technical support with global delivery

⭐RoHS and REACH compliant

Please contact us for free samples, magnet customization solutions, and MSDSRoHS, ISO 9001, QC080000, IATF 16949, ISO 14001, ISO 27001 or other relevant certificates!

7.  Usage Precautions？

⚠ Safety & Handling Guidelines

Handle with care: Neodymium magnets are brittle and can chip or crack if dropped or impacted.

Avoid injury: Always slide magnets apart—do not force or pry them to separate.

Check polarity before use: Incorrect installation may cause malfunction or damage to equipment.

Store properly: Keep in a dry, neutral environment; avoid contact with moisture, acids, or corrosive substances.

Keep away from sensitive electronics: Do not place near hard drives, magnetic cards, pacemakers, or similar devices.

8. Customization & Services

Customizable magnet dimensions, geometry, and surface coatings (including layer count, thickness, and color)

Precision magnetization orientation and adjustable magnetic field intensity

Optional laser marking for logos, part numbers, or traceability codes

Specialized packaging and pull-force testing tailored to your application needs

With deep expertise in magnetic materials, we deliver solutions for industries like EVs, smart manufacturing, and electronics. Our strong technical capabilities and product consistency have earned the trust of customers worldwide.

·  Precision Magnetics, Tailored for Performance.

If you have any magnet-related needs, we offer free customized magnet services. Please feel free to contact us at any time.

Contact Us：
 Phone/WhatsApp/WeChat: +86 13829120676

 Email: Info@jinconn.com

 Address: Xiaohe Industrial Zone, Daojiao Town, Dongguan City, Guangdong Province, China.