Product Overview & Application Scenarios
25mm x 8mm Neodymium Disc Magnets
Strong magnetic force high coercive force disc magnets offer a powerful and compact magnetic solution for home projects, including creating magnetic fixtures, organising tools, or securing lightweight items. In the professional world, they are crucial in manufacturing, engineering, and product design, where their magnetic strength and precision are essential for holding and positioning small components. Furthermore, they are used in the energy sector, particularly in the development of renewable energy devices, where their magnetic force contributes to efficient operation. These magnets are utilised across various industries, making them a reliable choice for both consumers and businesses.
Technical Parameters
|
Product Name |
high coercive force disc magnets |
|
Magnetic Grade |
N42 (Br ≥ 13.5 kGs, Hcj ≥ 12 kOe) |
|
Dimensions |
D - 25 x 8mm (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 |
2450 ±200 Gauss (measured with TM-801 Gauss meter) |
|
Magnetic Flux |
2.3 mWb (measured with fluxmeter) |
Manufacturing Process
The product is manufactured through a precision machining process tailored for sintered NdFeB magnets, ensuring high dimensional accuracy, surface integrity, and consistent magnetic performance.
- High-precision grinding equipment is used to shape the magnet to exact specifications while maintaining tight dimensional tolerances.
- A controlled coolant system is applied throughout machining to dissipate heat, reduce internal stress, and prevent microcracks in the brittle magnetic material.
- Careful process control ensures smooth surfaces, clean edges, and minimal material damage.
As a result, the finished magnets meet strict quality and performance standards, making them suitable for demanding applications such as motors, sensors, electronics, and aerospace components.
Quality Assurance Procedure
- Verification of raw material stability and supplier consistency
- Statistical monitoring of key production parameters to ensure batch-to-batch repeatability
- Magnetic performance validation before and after coating processes
- Inspection of edge integrity and coating coverage in high-risk corrosion areas
- Sampling-based environmental testing to verify long-term reliability
- Batch traceability linking production data, inspection results, and shipment records
Frequently Asked Questions:
Q1:Why can two magnets with the same grade show different performance in motors?
Answer:Grade alone does not reflect shape, magnetization orientation, coating thickness, or stress history. Differences in self-demagnetization factors, magnetization fixtures, and assembly tolerances can result in performance variation even with identical grade designations.
Q2:How is magnetic stability verified after coating and secondary processing?
Answer:Post-coating verification typically includes flux comparison before and after coating, adhesion testing, and optional thermal cycling. Excessive coating stress or thermal exposure during plating can cause partial magnetic loss if not properly controlled.
Q3: What are typical root causes of coating delamination in service?
Answer:Delamination is usually linked to poor surface activation, insufficient cleaning before plating, mismatched thermal expansion between coating layers, or excessive mechanical stress during assembly.
Q4: Usage Precautions?
A: Use appropriate fixtures or jigs for assembly to ensure safety and accuracy.
Avoid mechanical stress during mounting or fastening.
Design assemblies with protective housings when high magnetic forces are involved.
Consider magnetic shielding in sensitive applications.
Test magnetic performance after installation.
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
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