Product Overview & Application Scenarios
These Customized Premium quality 4mm x 2mm disc magnets are ideal for both commercial and personal applications, offering a strong magnetic hold with the added convenience of a self-adhesive backing. Widely used in the packaging industry, this industrial use 4mm x 2mm disc magnet is perfect for creating secure and elegant magnetic closures on boxes, folders, and other packaging materials. In addition to packaging, these magnets are commonly employed in the retail sector for mounting displays, signage, and promotional materials where a clean, adhesive-free surface is required. At home or in the office, they are great for organising spaces by attaching notes, keys, or small tools to desks, walls, or boards. Note: the non-adhesive side is the north polarity, and the adhesive side is the south polarity.
Technical Specifications
|
Product Name |
4mm x 2mm disc magnets |
|
Magnet Grade |
N42 (Br ≥12.9 kGs, Hcj ≥12 kOe) |
|
Dimension |
4mm x 2mm |
|
Dimensional Tolerance |
+/-0.05 |
|
Operating Temperature |
≤80°C (High-temp versions available) |
|
Density |
≥7.5 g/cm³ |
|
Surface Magnetic Field |
2,900 Gs |
|
Magnetic Flux |
2.0 mWb (Fluxmeter-tested) |
Manufacturing Process
We implement stringent, full-process quality control to ensure superior magnet quality: starting with controlled raw material sourcing and rigorous incoming inspections, followed by vacuum melting with precise compositional consistency control. We conduct stringent particle size and oxygen content regulation during milling, and high-precision magnetic alignment accuracy control in the pressing phase. The production process also includes sintering curve optimization and standardized heat treatment validation, plus full-dimensional precision inspection after machining. We perform comprehensive coating performance tests for thickness, adhesion and corrosion resistance, and conclude with full magnetic performance testing and complete batch traceability management for every product.
Packaging & Transportation
- Final quality approval is confirmed prior to packaging.
- Magnets are cleaned and dried to remove residues and moisture.
- Non-magnetic spacers or separators are applied to prevent surface damage.
- Products are packed into inner boxes with protective cushioning.
- Outer cartons or wooden cases are used to ensure transport safety.
- Packages are labeled with product details and batch traceability.
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
After Service
- We stand behind the quality and consistency of our NdFeB magnets.
- In case of quality concerns, our team will investigate and provide a clear solution.
- Application and handling guidance is available to help customers achieve optimal performance.
- Prompt response and effective communication are ensured throughout the after-sales process.
- Our goal is long-term cooperation and customer satisfaction.
FAQ
Q1. What are acceptable magnetic property tolerances for volume production?
Typical production tolerances include:
Br: ±2–3%
Hcj: minimum guaranteed value
Flux: defined statistically, not individually
Overly tight tolerances increase scrap rate without improving system performance.
Q2. Why do some magnets fail during epoxy curing or potting processes?
Failures often result from thermal shock, trapped solvents, or excessive curing temperature. NdFeB magnets have low fracture toughness and must be protected from rapid temperature ramps and uneven thermal stress.
Q3. How does humidity exposure before assembly affect magnet quality?
Uncoated or poorly sealed magnets can absorb moisture, leading to sub-surface corrosion that may not be immediately visible. This often causes delayed coating blistering or flux loss during later stages.
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