Customized heat resistant permanent round ring shaped nickel plated countersunk magnet

1. Product Overview & Application Scenarios

These Customized heat resistant high performance corrosion resistant permanent round nickel plated countersunk magnets are engineered for applications demanding rotational accuracy and controlled movement, such as energy converters, frictionless bearing systems, and precision electronic devices. Their hollow-core design enables direct mounting onto rotating components, proving indispensable for high-efficiency electromechanical systems.

Within consumer markets, these Customized industrial use high torque heat resistant high performance corrosion resistant permanent round nickel plated countersunk magnets serve as reliable fasteners in magnetic jewelry closures, offering convenient yet secure operation. They also facilitate scientific demonstrations, illustrating principles of magnetic levitation and polarity interactions in academic environments.

Built for durability, these Customized heat resistant energy efficient strong magnetic force high performance corrosion resistant permanent round nickel plated countersunk magnets maintain stable magnetic properties across both industrial and domestic use cases, addressing diverse operational requirements—from heavy-duty machinery to compact wearable accessories.

2. Technical Specifications

- Product Name:  Customized heat resistant high performance corrosion resistant permanent round nickel plated countersunk magnets

- Magnet Grade: N52 (Br ≥14.6 kGs, Hcj ≥12 kOe)  

- Dimension: OD30mm x ID15mm x T5mm  

- 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)  

3. Surface Treatment & Coating Technology

To enhance 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

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 error. 

Magnetic Flux Consistency Test: Fluxmeters or Hall-effect testers measure magnetic flux across batches to ensure uniform performance in end-user applications.

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.

Application Fields:

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

We understand logistics is more than just transport — it's about your commitment and customer satisfaction. Our solutions offer:

● Global logistics support

● End-to-end visual tracking

● Multiple layers of transport safety

● One-on-one customer service for tailored shipping plans

With our reliable land, sea, and air logistics network, we empower your business to go further and soar higher.

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.

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 MSDSRoHS, 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, Daojiao Town, Dongguan City, Guangdong, China