Product Overview
- 25mm x 10mm x 3mm Neodymium bar magnets
These customized high quality bar magnets are perfect for various home applications, such as securing light items, organizing tools, and creating magnetic fixtures. In professional settings, they are essential in manufacturing, engineering, and product design due to their consistent and strong magnetic force. These strong high quality bar magnets are commonly used in the printing industry to hold materials during production and in scientific research to stabilize experimental setups. These magnets are trusted across multiple industries, providing dependable performance for both personal and commercial use.
APPLICATION EXAMPLES
● Consumer Electronics
Used in speakers, headphones, vibration motors, hard disk drives, and smart devices, enabling compact and lightweight product designs.
● Industrial Automation and Robotics
Applied in servo systems, actuators, and automated equipment to ensure precise control and fast response.
● Medical Equipment
Used in medical sensors, diagnostic devices, and precision instruments requiring stable and reliable magnetic performance.
● Sensors and Magnetic Assemblies
Used in position sensors, speed sensors, and various magnetic components and assemblies.
Material Neodymium
|
Product Name |
high quality bar magnets |
|
Magnetic Grade |
N35 (Br ≥ 14.6 kGs, Hcj ≥ 20 kOe) |
|
Dimensions |
L25mm x 10mm x 3mm (customizable) |
|
Dimensional Tolerance |
Length ±0.05mm, Width ±0.05mm, Thickness ±0.05mm |
|
Operating Temperature |
≤90°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
Magnetic Alignment and Compaction
The fine powder is compacted under a strong magnetic field using axial or isostatic pressing. This aligns the magnetic domains in a preferred direction, significantly enhancing the magnet's anisotropic characteristics.
High-Temperature Vacuum Sintering
The green compacts are sintered in a vacuum furnace at elevated temperatures, allowing the particles to bond metallurgically and achieve near-full density, which directly determines the magnet's final magnetic strength.
Heat Treatment
Post-sintering heat treatment is applied to optimize the microstructure, stabilize magnetic properties, and improve resistance to demagnetization, particularly for high-temperature grades.
Reliability Testing
Magnet performance is influenced by material, process, and surface condition. Testing therefore covers the entire manufacturing chain.
Testing Logic:
- Incoming inspection confirms material meets design assumptions
- Process monitoring prevents performance drift
- Final testing verifies suitability for application conditions
Test Dimensions:
- Magnetic parameter measurement
- Dimensional and geometric stability checks
- Coating bond strength evaluation
- Corrosion resistance under salt spray conditions
Outputs:
Traceable testing and validation data
Packaging Process
Each magnet is isolated to prevent direct contact and magnetic impact
Anti-rust packaging materials and moisture control agents are used
Shock-resistant inner packaging secures magnets during transportation
External cartons are clearly labeled and magnetically shielded if necessary
Safety and Use Considerations
NdFeB magnets are brittle and should not be subjected to mechanical stress
Strong magnetic force may cause injury if handled improperly
Keep away from heat sources beyond the rated working temperature
Prevent contact with water, acids, or corrosive chemicals
Store magnets properly to ensure long-term reliability
Please contact us for free samples, magnet customization solutions, and MSDSRoHS, ISO 9001, QC080000, IATF 16949, ISO 14001, ISO 27001 or other relevant certificates!
FAQ
Q1. How does magnet thickness influence flux consistency in mass production?
Answer:Very thin magnets are more sensitive to powder alignment variation and grinding tolerance. Even small thickness deviations can cause measurable flux dispersion, especially in tight air-gap designs. Statistical process control on thickness is critical for flux consistency.
Q2. Why do two magnets with identical dimensions show different pull force values?
Answer:Pull force depends on surface condition, coating thickness, flatness, test fixture, and contact area, not just magnetic properties. Minor surface roughness or coating variation can significantly affect measured pull force.
Q3. What causes corner demagnetization in rectangular NdFeB magnets?
Answer:Corners experience higher local demagnetizing fields due to geometric flux leakage. This effect is amplified in high-temperature or low-coercivity grades. Chamfering and optimized magnetization direction help mitigate this issue.
Contact Us：
Phone/WhatsApp/WeChat: +86 13829120676
Email: Info@jinconn.com
Address: Xiaohe Industrial Zone, Daojiao Town, Dongguan City, Guangdong Province, China.
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