What Is N38H?
N38H is the entry point to the H-series high-temperature NdFeB grades. It trades a small amount of BHmax for significantly higher intrinsic coercivity, giving reliable service up to 120°C. Common in automotive auxiliary motors, pumps, and compact BLDC drives.
N38H Technical Specifications
| Remanence (Br) | 12.2–12.6 kGs (1.22–1.26 T) |
| Coercive Force (HcB) | ≥11.4 kOe (≥907 kA/m) |
| Intrinsic Coercivity (HcJ) | ≥17 kOe (≥1353 kA/m) |
| Energy Product (BHmax) | 36–39 MGOe (287–310 kJ/m³) |
| Max Operating Temperature | 120°C |
| Temperature Coefficient (Br) | -0.12 %/°C |
| Temperature Coefficient (HcJ) | -0.55 %/°C |
| Density (typical) | 7.5 g/cm³ |
| Vickers Hardness (typical) | 550–650 HV |
Values per IEC 60404-5 / GB/T 13560. Actual production values fall within the range quoted; batch-specific BH-curve data is provided on every certificate of conformance.
Where N38H Is Used
N38H is specified across the following application categories. Each links to a full application brief with design requirements and recommended grade combinations.
EV Motors
High-performance NdFeB magnets for electric vehicle traction motors, auxiliary drives, and e-axle systems — with the temperature stability and flux density required for continuous high-torque service.
Industrial Automation
NdFeB magnets for stepper motors, servo drives, linear actuators, magnetic couplings, and factory automation equipment across European and North American manufacturing.
Recommended Coatings for N38H
Coating choice is driven by operating environment and assembly method. For N38H, the typical options are:
- •NiCuNi
- •Epoxy over NiCuNi
See our NdFeB Coatings Guide for a full comparison with salt spray data and decision framework.
Design Considerations When Specifying N38H
- 01Requires proportionally more Dy/Tb than standard N38 — pricing tracks heavy rare earth markets.
- 02Consider GBD-processed N42H as an alternative offering better BHmax at similar cost.
- 03Verify HcJ at your operating temperature, not just at 20°C — thermal derating is significant.
Related Grades
↑ Higher temperature rating
N38SH (150°C)
↓ Lower temperature, lower cost
N38 (80°C)
Same family · High Temperature (H)
N42H · 40–43 MGOe (318–342 kJ/m³)
Same family · High Temperature (H)
N45H · 43–46 MGOe (342–366 kJ/m³)
Same family · High Temperature (H)
N48H · 45–48 MGOe (358–382 kJ/m³)
Same family · High Temperature (H)
N50H · 47–50 MGOe (374–398 kJ/m³)
Frequently Asked Questions
What is N38H NdFeB magnet?
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N38H is the entry point to the H-series high-temperature NdFeB grades. It trades a small amount of BHmax for significantly higher intrinsic coercivity, giving reliable service up to 120°C. Common in automotive auxiliary motors, pumps, and compact BLDC drives.
What is the maximum operating temperature of N38H?
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N38H sintered NdFeB is rated for continuous operation up to 120°C. This is the practical upper limit before thermal demagnetization begins to affect performance. For a safety margin, design for a working temperature at least 20–30°C below the maximum rating.
What is the BHmax of N38H?
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N38H delivers an energy product (BHmax) in the range of 36–39 MGOe (287–310 kJ/m³). This is the maximum magnetic energy density the grade can produce, measured according to standard IEC 60404-5 magnetic testing.
What applications use N38H magnets?
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N38H is typically specified for EV Motors, Industrial Automation. The grade's combination of 36–39 MGOe (287–310 kJ/m³) energy product and 120°C maximum service temperature determines its fit for any given motor or actuator design.
Request a Quote for N38H Magnets
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