Custom thermal stable permanent black epoxy coating neodymium rectangular countersunk Magnets
1. Product Overview
PScrew on side countersunk Black Epoxy Magnets for Electric Vehicles , these custom thermal stable high adhesive force corrosion resistant permanent black epoxy coating neodymium rectangular countersunk Magnets feature a Epoxy 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 | custom thermal stable permanent black epoxy coating neodymium rectangular countersunk Magnets |
Grade | N48 (Br ≥13.8 kGs, Hcj ≥12.4 kOe) |
Dimension | D30x10x4mm customize (Drill-4) |
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 | 2100Gauss (Measured with TM-801 Gauss meter) |
Magnetic Flux | 2.2 mWb (Fluxmeter tested) |
3. Manufacturing Process
The Key production stages of this custom precision machined thermal stable energy efficient permanent black epoxy coating neodymium rectangular countersunk Magnet are as following :
- 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. Appearance & Dimensional Inspection
Visual Inspection: Under standardized lighting, trained QC staff check for cracks, chipping, inclusions, pores, or oxidation.
Automated Intelligent Inspection: High-speed cameras with AI algorithms detect and reject defects (e.g., cracks, scratches, discoloration) and dimensional anomalies, improving yield and reducing human error.
Magnetic Flux Consistency Test: Fluxmeters or Hall-effect testers measure magnetic flux across batches to ensure uniform performance in end-user applications.
5. Reliability Testing
To ensure magnet maintain excellent corrosion resistance in complex or harsh environments, the salt spray test is an essential accelerated aging method. It simulates long-term exposure to marine climates, industrial pollution, humidity, or acidic and alkaline conditions, allowing for a reliable evaluation of the protective performance and durability of the magnet's surface coating.
Constant Temperature & Humidity Test: Performed under 85°C and 85% RH for 96–500 hours. Performance and appearance are compared before and after testing.
6. 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.
We know logistics is more than moving goods — it’s about delivering your promise. Our trusted solutions offer:
Global shipping coverage
Real-time tracking from origin to destination
Enhanced safety at every stage
Dedicated service with customized shipping plans
With our robust land, sea, and air network, your business moves faster, safer, and with complete confidence.
7. 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!
8. 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.
9. 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.
10. 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.
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