Product Overview & Application Scenarios
These rare earth NdFeB long bar magnets are engineered for applications requiring high holding force and uniform magnetic output along a linear profile. Compared with ferrite and AlNiCo magnets, they provide significantly higher magnetic energy density in a compact cross-section.
The elongated bar design enhances flux distribution and contact area, delivering strong adhesive force and stable positioning performance. Precision sintering and controlled magnetization ensure consistent magnetic orientation and repeatable results.
With corrosion-resistant coatings and tight dimensional tolerances, these NdFeB bar magnets are well suited for industrial fixtures, automation systems, tool positioning, and engineering assemblies where high performance is essential.
Technical Specifications
|
Product Name |
large bar magnets |
|
Magnet Grade |
N42 (Br ≥12.9 kGs, Hcj ≥12 kOe) |
|
Dimension |
15mm x 15mm x 4mm |
|
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) |
This section addresses the most critical question from customers: how the magnetic material performs in real operating conditions, and why it is suitable for their application.
2.1 NdFeB Grade System Overview
Neodymium Iron Boron (NdFeB) magnets are typically defined by a combination of energy grade and temperature resistance class, for example N42SH.
Energy Grades (N-Series)
- N35 / N38
Cost-effective grades for stable operating environments and general applications
- N42 / N45
Mainstream grades offering a balanced combination of performance and cost
- N48 / N50 / N52
High-performance grades designed for compact systems and high power density requirements
2.2 Temperature Resistance Classes
|
Suffix |
Max. Operating Temperature |
Typical Applications |
|
None |
80°C |
Consumer electronics, standard devices |
|
H |
120°C |
Industrial motors |
|
SH |
150°C |
Servo motors, EV motors |
|
UH |
180°C |
High-temperature industrial environments |
|
EH |
200°C |
Special motor designs |
|
AH |
230°C |
Customized extreme-temperature solutions |
Higher temperature grades are achieved by increasing intrinsic coercivity (Hcj), which requires advanced alloy formulation and process control.
Application Fields
Motor Applications
Servo Motors
Key Requirements
High torque density
Controlled temperature rise
Long-term performance stability
Recommended Grades
N42SH / N45SH / N48UH
Common Challenges & Solutions
Risk: Demagnetization under continuous high temperature
Solution: Higher Hcj grades combined with optimized magnet geometry
Electric Vehicle Drive Motors
Key Requirements
- High power density
- Strong demagnetization resistance
- Consistent performance in mass production
Recommended Grades
N48H / N50SH / Customized high-Hcj solutions
Common Challenges & Solutions
- Risk: Performance degradation under peak load conditions
- Solution: SH/UH grades with thermal simulation-based safety margins
Packaging, Transportation & Safety
NdFeB magnets are packaged with appropriate separation and cushioning materials to prevent impact, chipping, and magnetic collision
Moisture-resistant packaging and desiccants are applied to protect surface coatings during storage and transit
Magnetic shielding is implemented when required to control external magnetic fields
Packaging solutions are designed to comply with air, sea, and land transportation regulations
Proper labeling and handling instructions ensure safe and compliant logistics operations
Technical Support & Customization
Provide professional support during the early selection stage, including material grade and performance recommendations
01
Assist with magnetic circuit design and application feasibility analysis
02
Offer sampling and validation services to support customer testing and approval
03
Support customization of dimensions, tolerances, magnetization methods, and performance parameters
04
Maintain ongoing technical communication to support long-term application stability
05
FAQ
Q1. What parameters are monitored during salt spray testing?
Key parameters include salt concentration, chamber temperature, pH value, spray rate, and exposure duration. Surface condition and corrosion initiation time are documented throughout the test.
Q2. How is micro-cracking in coatings detected after testing?
Micro-cracks are detected using optical microscopy, scanning electron microscopy (SEM), or dye penetration inspection after corrosion and thermal tests.
Q3. How is coating adhesion quantified rather than visually judged?
Adhesion is quantified using standardized cross-cut tests with defined classification scales or peel strength measurements to provide objective acceptance criteria.
We're here to help!
Phone/WhatsApp/WeChat: +86 13829120676
Email: info@jinconn.com
Website: www.jinconnmagnet.com
Address: Xiaohe Industrial Zone, Daojiao Town, Dongguan City, Guangdong, China
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