What Is N38EH?
N38EH is used in downhole drilling motors, defense servo actuators, and aerospace auxiliary drives where 200°C operation is required and a modest improvement in energy product over N35EH is justified.
N38EH Technical Specifications
| Remanence (Br) | 12.2–12.6 kGs (1.22–1.26 T) |
| Coercive Force (HcB) | ≥11.3 kOe (≥899 kA/m) |
| Intrinsic Coercivity (HcJ) | ≥30 kOe (≥2388 kA/m) |
| Energy Product (BHmax) | 36–39 MGOe (287–310 kJ/m³) |
| Max Operating Temperature | 200°C |
| Temperature Coefficient (Br) | -0.12 %/°C |
| Temperature Coefficient (HcJ) | -0.45 %/°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 N38EH Is Used
N38EH is specified across the following application categories. Each links to a full application brief with design requirements and recommended grade combinations.
Recommended Coatings for N38EH
Coating choice is driven by operating environment and assembly method. For N38EH, 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 N38EH
- 01Confirm compliance with any end-customer restricted-material clauses.
- 02Production capacity is concentrated in a very small number of qualified sources.
- 03SmCo2:17 is a reasonable alternative for some designs — evaluate together.
Related Grades
Frequently Asked Questions
What is N38EH NdFeB magnet?
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N38EH is used in downhole drilling motors, defense servo actuators, and aerospace auxiliary drives where 200°C operation is required and a modest improvement in energy product over N35EH is justified.
What is the maximum operating temperature of N38EH?
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N38EH sintered NdFeB is rated for continuous operation up to 200°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 N38EH?
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N38EH 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 N38EH magnets?
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N38EH is typically specified for Aerospace & Defense. The grade's combination of 36–39 MGOe (287–310 kJ/m³) energy product and 200°C maximum service temperature determines its fit for any given motor or actuator design.
Request a Quote for N38EH Magnets
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