Struggling to find the right NdFeB magnet grade1 and coating for your project? The wrong choice can lead to performance failures, demagnetization, and costly redesigns. You need a partner who understands both the technical specifications and your real-world application.
As your expert NdFeB magnet manufacturer in China, we provide high-performance, custom neodymium magnets2 from N35 to N553, including advanced High-Temp and Grain Boundary Diffusion (GBD)4 options. We ensure quality with ISO 2859 AQL inspection5 and full compliance (CE/FCC/RoHS/REACH), helping you enhance your product's yield and reliability.
Finding the perfect magnet shouldn't be a guessing game. From my years helping clients like Reza in the wireless charging industry and Charalampos in acoustics, I know that success comes from matching the right magnet to the specific application. That's why we’ve designed this page to be your definitive guide. Whether you need a quick quote or want to dive deep into demagnetization curves6, we're here to make your procurement process seamless and secure.
Find Your Perfect Magnet in 3 Steps
- Define Your Application: Tell us if it's for a motor, sensor, or wireless charger.
- Specify Key Parameters: Provide dimensions, temperature needs, and quantity.
- Choose Your Finish: Select a coating and upload any technical drawings. [-> Get Your Instant Quote within 24 Hours]
NdFeB Magnet Applications
Where do our magnets make a difference? From consumer electronics to heavy industry, the right NdFeB magnet is critical for performance. I’ve seen our magnets empower innovation across countless fields. We don't just sell a product; we provide a core component for your success.
We create specialized landing pages for our major applications. Here are a few examples:
- [Wireless Charger Magnets]＞＞: Precision arrays for Qi/Qi2 applications, focusing on Q-factor, eddy current suppression, and thermal stability7.
- [BLDC Motor Magnets]＞＞: High-coercivity arc segments (N48SH, N50UH, GBD) designed for high-speed, high-temperature rotors.
- [Speaker & Audio Magnets]＞＞: Optimized for acoustic solutions8, providing powerful and stable magnetic fields for clear sound reproduction.
- [Sensor Magnets]＞＞: Small, precision magnets with tight magnetic field tolerances for automotive and industrial sensors.
NdFeB Magnet Grades & Properties
Navigating the sea of grades can be confusing. N52 isn't always the best choice; for high-temperature applications, a lower grade with a higher coercivity (like N38UH9) can vastly outperform it. This table is your starting point.
For our engineering clients, we're developing an interactive version with grade filters, unit switching (Metric/Imperial), and a comparison tool.
| Grade | Remanence (Br) | Coercivity (Hcb) | Intrinsic Coercivity (Hcj) | Max. Energy Product (BH)max | Max. Working Temp. |
|---|---|---|---|---|---|
| mT (kG) | kA/m (kOe) | kA/m (kOe) | kJ/m³ (MGOe) | °C (°F) | |
| N35 | 1170-1210 (11.7-12.1) | ≥868 (≥10.9) | ≥955 (≥12) | 263-287 (33-36) | 80 (176) |
| N52 | 1430-1480 (14.3-14.8) | ≥828 (≥10.4) | ≥876 (≥11) | 398-422 (50-53) | 65 (149) |
| N42SH | 1280-1320 (12.8-13.2) | ≥995 (≥12.5) | ≥1592 (≥20) | 318-342 (40-43) | 150 (302) |
| N38UH9 | 1220-1250 (12.2-12.5) | ≥915 (≥11.5) | ≥1990 (≥25) | 287-310 (36-39) | 180 (356) |
| ... | ... | ... | ... | ... | ... |
[[+] Click to Expand Full Grade Table & Download Datasheet Pack]
High Temperature NdFeB Magnets
Standard NdFeB magnets lose their power permanently if they get too hot. For demanding applications like automotive motors or industrial equipment, you need high-temperature grades. This is achieved by adding elements like Dysprosium (Dy) and Terbium (Tb).
Understanding the Letter Codes
- (M) → up to 100°C
- (H) → up to 120°C
- (SH) → up to 150°C
- (UH) → up to 180°C
- (EH) → up to 200°C
- (AH) → up to 230°C
Pro Tip: Don't just look at the (BH)max. For high-temperature stability, Intrinsic Coercivity (Hcj) is the most important parameter. A higher Hcj value means better resistance to demagnetization.
GBD (Grain Boundary Diffusion) NdFeB Magnets
What if you need high-temperature performance without the high cost and supply risk of heavy rare earths like Dysprosium? Grain Boundary Diffusion (GBD)4 is our advanced solution.
GBD technology applies heavy rare earth elements only to the surface of the magnet. These elements then diffuse along the grain boundaries, strengthening the magnet's coercivity where it's needed most.
GBD vs. Traditional Doping
| Feature | Grain Boundary Diffusion (GBD)4 | Traditional Sintering |
|---|---|---|
| Performance | High Hcj, slightly lower Br | Lower Hcj, higher Br |
| Cost | Uses up to 70% less heavy rare earth | High cost due to uniform doping |
| Best Use Case | High-temp applications, especially for thin magnets (<6mm) | General purpose applications |
For many high-performance motor designs, GBD offers a more efficient and cost-effective path to achieving high-temperature stability.
NdFeB Magnet Coatings
A raw NdFeB magnet will rust quickly. The right coating is essential for longevity. Choosing a coating is a balance between environmental protection, cost, and physical properties. I often help clients make this choice based on their specific needs.
| Coating | Corrosion Resistance | Appearance | Thickness | Main Advantage |
|---|---|---|---|---|
| Nickel (Ni-Cu-Ni) | Good | Bright Metallic | ~12µm | Most common, cost-effective |
| Black Epoxy | Very Good | Matte/Glossy Black | ~15µm | Excellent for humid/outdoor use |
| Zinc (Zn) | Moderate | Bluish/Yellowish Tint | ~8µm | Low cost, self-healing properties |
| Parylene | Excellent | Transparent | ~2-15µm | Pin-hole free, ideal for medical/thin parts |
[-> Download Our Complete Coating Guide & Decision Tree]
Our Promise: Verifiable Quality & Full Compliance
Trust is earned through transparency. For buyers like Reza and Charalampos, concerns about certificate fraud and inconsistent quality are real. That’s why we’ve built our process around verifiable proof. We don't just claim quality; we show you the evidence.
- ISO 2859 AQL Inspection: We don’t just spot-check. We use the same statistical sampling standard as major international inspection bodies. This means you know exactly what our quality promise means in practice.
- Certificate Verification System: Every batch we ship comes with a unique serial number. You can enter this number on our website to view and verify the authentic material test report (COA) and B-H curve for your specific production run.
- Full Process Transparency: We provide inspection videos (salt spray, thermal shock, drop tests) and welcome third-party inspections from bodies like SGS or BV.
- One-Click Compliance Pack: Get instant access to all necessary compliance documents10 for your market, including CE, FCC, RoHS, and REACH declarations.
[-> Enter a Batch Number to Verify a Report] | [-> Watch Our Testing Process Video]
Case Study: Optimizing Magnets for a Wireless Charger
A client (similar to Reza) was facing issues with their wireless chargers overheating and having inconsistent charging speeds. Their previous supplier provided N52 magnets, but the issue persisted.
- Our Analysis: We discovered the problem wasn't the magnet's strength (Br) but its performance under heat and the magnetic circuit design.
- Our Solution:
- Switched to an N45SH grade magnet to improve thermal stability7 (higher Hcj).
- Recommended a laminated magnet array to reduce eddy currents, a major source of heat.
- Advised on a Black Epoxy coating11 for better adhesion to the glass housing.
- The Result: A 15% reduction in operating temperature and a stable, reliable charging performance that passed all CE/FCC tests. This is the difference an expert partner makes.
Get Your Custom NdFeB Magnet Quote
Ready to begin? Let's build a reliable component for your product. Our team is online from 09:00–18:00 (China Standard Time) to assist you.
[Interactive Quote Form: Step 1: Application/Temp | Step 2: Dims/Qty | Step 3: Coating/File Upload]
- You will receive a quote and design feedback within 24 hours.
- Standard samples ship in 3-5 days.
- Mass production lead time is typically 2-3 weeks.
Need to talk? [WhatsApp] [WeChat] [Email] [Schedule a Teams call]
Understanding NdFeB magnet grades is crucial for selecting the right magnet for your project. ↩
Explore the manufacturing process of custom neodymium magnets to ensure quality and performance. ↩
Understanding the differences between N35 and N55 can help you select the right magnet for your needs. ↩
Discover how GBD technology enhances magnet performance while reducing costs. ↩
Understanding ISO 2859 AQL inspection can help you ensure product quality and compliance. ↩
Explore demagnetization curves to better understand magnet behavior under different conditions. ↩
Understanding thermal stability can help you select magnets for high-temperature applications. ↩
Discover how NdFeB magnets improve sound quality in audio applications. ↩
Understanding N38UH properties can help you choose the right magnet for high-temperature applications. ↩
Learn about essential compliance documents to ensure your magnets meet industry standards. ↩
Learn how Black Epoxy coating enhances magnet durability and performance. ↩
