Product Overview & Application Scenarios
These thermal stable black epoxy coating cylindrical magnets are excellent for a wide range of household and DIY applications, delivering powerful magnetic force in a slender, cylindrical form. They work perfectly for crafting custom magnetic latches, keeping cabinet doors firmly shut, or neatly arranging tools in confined areas, ensuring dependable performance for daily tasks. Beyond home use, these high energy density black epoxy coated cylindrical magnets are also commonly utilized in automotive engineering, especially in ABS sensors and fuel injection systems, where their elongated design guarantees accurate and stable magnetic fields. Their adaptability and high strength make them indispensable for both personal projects and industrial applications.
Technical Specifications
|
Product Name |
black epoxy coating cylindrical magnets |
|
Magnet Grade |
N52 (Br ≥14.2 kGs, Hcj ≥12 kOe) |
|
Dimension |
20mm x 15mm |
|
Dimensional Tolerance |
+/-0.05 |
|
Operating Temperature |
≤80°C (High-temp versions available) |
|
Density |
≥7.5 g/cm³ |
|
Surface Magnetic Field |
3,900 Gs |
|
Magnetic Flux |
2.0 mWb (Fluxmeter-tested) |
Surface Treatment & Coating Technology
Pre-cleaning and degreasing to remove machining residues, oils, and surface contaminants.
Chemical activation to prepare the magnet surface and enhance coating adhesion.
Intermediate treatment (as required) to improve surface uniformity and corrosion resistance.
Coating deposition, such as Ni–Cu–Ni electroplating, epoxy or polymer coating, or zinc/phosphate treatment, based on application requirements.
Curing or post-treatment to stabilize the coating structure and ensure adhesion and durability.
Final inspection to verify coating thickness, surface integrity, and conformity to specifications.
Why Choose us ?
Dongguan Jinconn New Material Holdings Co., Ltd. is a publicly listed manufacturer specializing in rare earth permanent magnets, providing integrated capabilities across research and development, precision manufacturing, and global sales. Located in Daojiao Town, Dongguan, the company serves customers throughout China and international markets.
With extensive experience in magnetic materials and industrial magnet applications, Jinconn offers a deep understanding of performance requirements, process reliability, and application-specific challenges across multiple industries. Our dedicated R&D and engineering teams, supported by in-house tooling and testing facilities, enable the development of custom geometries, tight tolerances, and tailored magnetic solutions.
In addition, Jinconn operates under strict quality management systems, ensures stable production capacity, and maintains responsive technical support, allowing us to deliver consistent quality, reliable lead times, and long-term value to our partners worldwide.
Packaging Process
Due to their strong magnetic force, brittleness, and sensitivity to corrosion, NdFeB magnets require a carefully controlled packaging process to ensure product safety, performance integrity, and damage-free delivery.
- Final Inspection Before Packaging
Before packaging, all magnets undergo final inspections, including visual examination, dimensional verification, magnetic performance checks, and coating integrity assessment. Only products that fully meet specification requirements proceed to the packaging stage.
- Magnetic Separation and Spacing
Magnets are separated using non-magnetic spacers, plastic sheets, or foam inserts to prevent direct contact. This step reduces the risk of collision, chipping, cracking, or unintended attraction during handling and transportation.
- Individual or Layered Protection
Depending on size and application, magnets are either individually wrapped or layered with protective materials such as plastic film, blister trays, or anti-static bags. This provides mechanical cushioning and protects the coating surface from scratches or abrasion.
- Moisture and Corrosion Protection
To prevent corrosion, especially during long-distance or sea transportation, desiccants (silica gel) are added, and moisture-resistant packaging materials are used. For higher protection requirements, vacuum sealing or sealed plastic bags may be applied.
- Magnetic Shielding (If Required)
For strong magnets or air shipment, magnetic shielding using steel plates or shielding boxes is implemented to reduce external magnetic field strength and comply with transportation safety regulations.
Customization & Engineering Support
Pre-Sales Technical Support
Our pre-sales service provides in-depth technical support for NdFeB magnet applications. We assist customers with magnetic circuit analysis, grade optimization, thermal performance evaluation, and coating selection based on operating conditions. Customized solutions are proposed to meet specific requirements for magnetic strength, stability, and lifespan. Prototyping, testing samples, and technical documentation are provided to ensure design feasibility and application compatibility prior to mass production.
After-Sales Technical Service
We deliver continuous after-sales technical service to support product performance throughout its lifecycle. Our engineers provide guidance on installation, magnetization direction, handling precautions, and demagnetization prevention. For any quality or application issues, we conduct systematic failure analysis and implement corrective and preventive actions. Feedback is actively collected to optimize future designs and production processes.
Quality Control & Inspection Process
Quality control for NdFeB magnets is implemented from raw material to final shipment. Raw materials are tested for composition and consistency. In-process inspections include dimensional checks, magnetic property verification (Br, Hcj, BHmax), coating adhesion, and appearance inspection. Final inspections include 100% magnetic flux testing, dimensional verification, surface inspection, and corrosion resistance testing where required. All inspections are conducted according to defined quality standards and documented for traceability.
FAQ
Q: How is magnetic performance tested?
A: Magnetic properties are tested using flux meters, gauss meters, and hysteresis graph measurement systems to ensure compliance with specifications.
Q: What is magnet aging and how is it evaluated?
A: Magnet aging refers to long-term performance stability. Accelerated aging tests under elevated temperature and humidity conditions are used to assess performance retention.
Q:How does magnet size affect magnetic performance?
A: Magnetic performance is influenced by geometry. Smaller magnets may experience proportionally higher flux leakage, while larger magnets require careful magnetization control.
We're here to help!
Phone/WhatsApp/WeChat: +86 13829120676
Email: info@jinconn.com
Website: www.jinconnmagnet.com
Address: Xiaohe Industrial Zone, Daojiao Town, Dongguan City, Guangdong, China
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