What Is N42EH?
N42EH represents the current state of the art in combining energy product and temperature stability for NdFeB. It is reserved for defense, aerospace, and energy applications where the combination of flux and thermal margin cannot be achieved with any other material. Production is extremely limited.
N42EH Technical Specifications
| Remanence (Br) | 12.9–13.3 kGs (1.29–1.33 T) |
| Coercive Force (HcB) | ≥11.9 kOe (≥947 kA/m) |
| Intrinsic Coercivity (HcJ) | ≥30 kOe (≥2388 kA/m) |
| Energy Product (BHmax) | 40–43 MGOe (318–342 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 N42EH Is Used
N42EH is specified across the following application categories. Each links to a full application brief with design requirements and recommended grade combinations.
Recommended Coatings for N42EH
Coating choice is driven by operating environment and assembly method. For N42EH, 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 N42EH
- 01Strict end-use verification required — license applications face thorough review.
- 02Always specify GBD processing — any other production path is commercially unviable.
- 03Always cross-qualify with SmCo2:17 for the same design — SmCo is often the better fit above 200°C.
Related Grades
Frequently Asked Questions
What is N42EH NdFeB magnet?
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N42EH represents the current state of the art in combining energy product and temperature stability for NdFeB. It is reserved for defense, aerospace, and energy applications where the combination of flux and thermal margin cannot be achieved with any other material. Production is extremely limited.
What is the maximum operating temperature of N42EH?
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N42EH 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 N42EH?
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N42EH delivers an energy product (BHmax) in the range of 40–43 MGOe (318–342 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 N42EH magnets?
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N42EH is typically specified for Aerospace & Defense. The grade's combination of 40–43 MGOe (318–342 kJ/m³) energy product and 200°C maximum service temperature determines its fit for any given motor or actuator design.
Request a Quote for N42EH Magnets
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