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  • Powerful D 45mm x 3.5mm Neodymium Round Magnets – Black Epoxy Coated, Rare Earth Magnets for DIY, Crafts, Woodworking, Engineering & More
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  • Powerful D 45mm x 3.5mm Neodymium Round Magnets – Black Epoxy Coated, Rare Earth Magnets for DIY, Crafts, Woodworking, Engineering & More

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Powerful D 45mm x 3.5mm Neodymium Round Magnets – Black Epoxy Coated, Rare Earth Magnets for DIY, Crafts, Woodworking, Engineering & More

  


Understanding Neodymium Magnets

Neodymium (NdFeB) magnets are known for their exceptional magnetic strength, making them the strongest type of permanent magnet on the market. Their compact size enables them to deliver a high magnetic force, even in space-constrained applications. In construction, they help securely position metal components during assembly, while in the medical sector, they play a vital role in the consistent performance of imaging systems and sensitive equipment. From everyday home tasks to demanding industrial operations, these magnets ensure dependable, long-lasting functionality.

 

45mm x 3.56mm  Black Epoxy Coated Neodymium Round Magnets

These premium 15mm x 10mm x 2mm neodymium block magnets are engineered for maximum magnetic strength in a compact size. Featuring a durable black epoxy coating, these rare-earth magnets offer excellent corrosion resistance, making them ideal for use in wet, humid, and salty environments.

 

Perfect for DIY enthusiasts, craft projects, woodworking, furniture making, engineering applications, manufacturing, retail displays, classroom experiments, and science education, these magnets deliver strong holding power and are easily fixed in place using adhesive or mounted against ferrous surfaces.

 

Magnet Grade: N42

N42 grade neodymium magnets offer a balanced combination of strength and versatility, with a maximum energy product of around 40 MGOe. Well-suited for various applications, including motors, sensors, and precision assemblies, they deliver consistent magnetic performance. Their reliable field strength makes them a preferred choice for consumer electronics and technical equipment alike. Widely adopted across industries, N42 magnets are valued for their dependable and efficient performance.

 

Surface Finish: Epoxy Coating

These magnets are finished with a durable triple-layer epoxy coating that enhances corrosion resistance and maintains a clean, professional look. This layered shield protects the magnet’s core from oxidation and wear in mildly humid environments, making it suitable for long-term use in a range of settings. For more aggressive environments, epoxy or other advanced coatings may offer enhanced protection.

 

APPLICATION EXAMPLES


 


Material Neodymium (NdFeB)

Product Name: Black Epoxy Coated Neodymium Block Magnets
Magnetic Grade: N42 (Br ≥ 13.3 kGs, Hcj ≥ 12 kOe)
Dimensions: D 45mm x 3.5mm (customizable)
Dimensional Tolerance: Length ±0.05mm, Width ±0.05mm, Thickness ±0.05mm
Operating Temperature: ≤80°C (high-temp version available)
Density: ≥7.5 g/cm³
Surface Magnetic Field: 3800 ±200 Gauss (measured with TM-801 Gauss meter)
Magnetic Flux: 2.3 mWb (measured with fluxmeter)

 

Manufacturing Process

The product is manufactured through the following key processes:

● A high-speed grinding wheel shapes the magnet's surfaces with tight dimensional tolerances.

● Coolant fluid is applied to control heat, reduce surface stress, and ensure a smooth finish.

● The result is a uniform, precisely dimensioned magnet with clean edges—ideal for high-performance applications.

This precision step is essential for ensuring that the final magnets meet strict quality standards for use in motors, sensors, electronics, and aerospace components


Surface Treatment & Plating

To enhance corrosion resistance and appearance:

Default Plating: Black Epoxy (customizable).

Standard Thickness: Epoxy (10 - 20μm)

Features:

✔ Salt spray & oxidation resistance

✔ Increased surface hardness (scratch-resistant)

✔ Improved gloss (ideal for exposed components)

Appearance & Dimensional Inspection

Visual Inspection: Under standardized lighting, trained QC staff check for cracks, chipping, inclusions, pores, or oxidation

   


Image Measurement System: High-res cameras and algorithms conduct non-contact 2D measurements, especially for complex or irregular shapes, ensuring efficiency and objectivity in mass production.

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 


Applications

Electric Motors & Generators
Application: Precision-engineered magnets are employed in stators, rotors, and brushless DC motors to enhance magnetic flux density, efficiency, and torque performance.

Consumer Electronics
Application: High-performance neodymium magnets are integrated into speakers, haptic systems, vibration motors, and sensors, contributing to compact design and reliable functionality.

 

 

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.

 


Frequently Asked Questions:

Q: How to choose the correct magnetization direction?

Axial Magnetization: Magnetic lines flow through the thickness — best for concentrated fields

Radial Magnetization: Magnetic lines radiate outward, for uniform field distribution

Multipole Magnetization: Multiple poles along circumference — for complex fields (e.g., motors, sensors)

Q: What is the maximum working temperature of a ring magnet?

Standard N-series: up to 80°C

High-temp grades (SH/UH/EH): up to 150°C–230°C

Dysprosium-enriched formulations can further enhance temperature resistance

Q: Does magnetism decay over time?

Under normal conditions (room temp, dry, no heavy vibration), NdFeB magnets exhibit excellent time stability (<5% loss over 10 years). However, factors like:

● Temperature overrun

● Strong external magnetic fields

● Surface corrosion

● Mechanical impact may affect performance.

 

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. 


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.

Usage Precautions?

● Handle gently: Avoid impacts/drops (brittle material).

● Prevent pinching: Slide magnets apart—do not pry.

● Polarity check: Ensure proper installation to prevent malfunctions.

● Avoid moisture/acids: Store in dry, mild environments.

● Keep away from sensitive devices, such as hard drives, IC cards, and pacemakers.

Customization & Services

● Custom magnet size, shape, and coating (layers, thickness, color)

● Tailored magnetization direction and field strength

● Laser engraving service for logos or serial numbers

● Packaging and suction force testing for special applications


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

We’re here to help!

Phone/WhatsApp/WeChat: +86 180 3822 5893


Email: sales@jinconn.com


 Website: www.jinconnmagnet.com


Address: Xiaohe Industrial Zone, Da




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