Thin neodymium countersunk ring -shaped magnet

1. Product Overview & Application Scenarios

This custom high adhesive force excellent therma stability Thin neodymium countersunk ring -shaped magnet crafted from premium-grade NdFeB material, offering exceptional magnetic strength and stability. Designed with a precise inner hole and polished nickel coating, it delivers superior corrosion resistance and mechanical durability. Its high energy density and strong pull force make it ideal for demanding applications in motors, sensors, magnetic couplings, and precision engineering. The ring shape ensures uniform magnetic flux distribution, enabling efficient axial or radial magnetization as required. Available in various sizes and customizable grades (e.g., N35 to N52), this industrial use corrosion resistant fast response Thin neodymium countersunk ring -shaped magnet combines compact form with powerful performance, making it a preferred choice for both industrial and high-tech solutions where space, strength, and reliability are critical

Application Scenarios

Magnetic Couplings & Seal Drives
Suitable for liquid pumps, mixers, and other non-contact power transmission systems.
Ensures complete sealing and reduces wear and tear.

Loudspeakers & Audio Devices
Delivers a concentrated magnetic field to optimize voice coil response.
Commonly used in high-end loudspeakers, headphones, microphones, and related equipment.

2. Technical Specifications

- Product Name: Thin neodymium countersunk ring -shaped magnet

- Magnet Grade: N52 (Br ≥14.2 kGs, Hcj ≥12 kOe)

- Dimension: D5x3mm

- Dimensional Tolerance: +/-0.05 

- Operating Temperature: ≤80°C (High-temp versions available)  

- Density: ≥7.5 g/cm³  

- Surface Magnetic Field: 3,500 Gs  

- Magnetic Flux : 2.0 mWb  (Fluxmeter-tested)  

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.  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.

9. 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.